Dear Eli Your tutorials are the most clear and exciting I have ever seen. You make me understand everything you demonstrate, explain and present. You have skills and great knowledge of real practicals of computer world. I'm impressed because I have been to other countries to study what I should have acquired sitting in front of my PC at home. Thanks for helping me understand better.
I appreciate everything you do so much Eli, thank you. I try to share your videos as much as possible. Thank you so much for everything you've taught me.
To hear the lesson on both ears, download the video and open it with the latest version of VLC (older version may not suppport this). Then: - Right click on the screen - Audio - Stereo Modality - Left So you will hear the sound from the left side on both hear when using headphones!. Thank you Eli for your videos!!!
First of all, I must thank you. With this video series, you opened my mind to new possibilities that I was unable to consider before, making my complex nodes of thought to loosen their tight , making things easily understandable (to the point I wasn't able to concentrate on your talking cause I was thinking how to apply the beautiful things I just have understood). You're easily understandable thanks to the high PNL skill applied in your speech. While getting things really easier to understand you can even guide these poor sheeps to the village's marketplace! Thanks Computer guy, you have my trust!
Lol i feel bad for people trying to understand the accents especially thick native ones. I'm soo so thankful I can understand it because Indians do have an excellent and prolific grasp on IT, in general. So yeah I definitely feel for you guys! Ahahah
A little tip for all new DOS users; typing "help" (not including the ""), alone or after a command, will give you options for that command. If typed alone, it gives a comprehensive list of commands. So for example; ping /help will give you a list of arguments for the ping command. Another essential DOS cmd set to know for networking would have to be to understand and know how to reset winsock and understand netsh.
Ely. you are a natural teacher. It is great to listen and learn from you. The problem I have is I cannot organize your lessons in the right order, so I listen to different subjects as I find them...but, again - every lesson is always very well organized, professional etc. By the way, there is a problem with the fact that technology changes quickly, for example, in comm cables there is cat 7..(the red cable), but I understand that it is not possible for you to update, and it is really not that critical. So thanks a million. Arik
I'm almost certain that TTL in a ping is not a time-counter but a hop-counter. it means that a packet can pass so much hops until it dies, where each node it passes means one less TTL record. by default an ICMP gets on the road with 255 hops which includes both directions (i.e. 128 is max TTL you``ll see when there is only one router to pass) I may be wrong but I`m pretty sure I`m not
+willow klan Actually TTL is a time counter. The minimum amount that can be reduced is one second. Nowadays routers process packets in less than a second, that's why the TTL is reduced by one at every hop. Theoretically, if you somehow can stop the packet at your router for 3 seconds, then the TTL will be reduced by 3. I guess, nowadays it is not a mistake to consider TTL as a hop counter, but one should be aware of the underlying nature, just in case.
+Sergey Khegay reason for TTL is to kill packets that else would continue to go around forever. Each relay device (routers) shall reduce TTL by one each time they handle a packet. Sender sets initial value as wish. This is how tracert works. First paket has TTL=1, first device shall decrease it to 0 so you get an ICMP error message from this device and log it. Next comes TTL=2 so you get the error message from the SECOND device, counting outwards like an onion, and so on. tracert with maximum 30 hops means that it shall try up to 30 steps or TTL value before it stops it.
i love the key point links in the vid description for reference you are the best. I'm currently taking electrical engineering in school and am learning networking/ programming on the side this is so helpful due to my time constraints thank you much man
Awesome video. Thank you so much for uploading this. I was finally able to settle an argument with my cousin regarding discovering MAC addresses on a network.
@17:20 Time to live (TTL) doesn't indicate latency or delays in the system. It's how many hops the packet will take before giving up. The latency is indicated by the "time" field. Additionally, increasing the TTL will not increase the chances of a packet surviving a single flaky hop. Its just there to prevent networks from having immortal packets hopping around in circles.
As an IT professional, these videos are great for getting perspective, handing off to the new guys to get them on a jump start, etc. However, as IT professionals, it usually requires headphone use at work and your audio is only left channel which is incredibly irritating.
Useful arguments to ping are *-t* to ping continuously until stopped, and *-w* to set the timeout. You can use ping in batch files to insert a pause of any length by pinging a non-existant network and waiting for a timeout w. The TTL is hardly useful in ping because the default of 64 hops and timeout of 4s are plenty for any network. Australia is 20 hops and 350 ms away from europe. Furthest places like China might be 30-35 hops. If you placed 65 routers inbetween you and the destination, or a routing loop which somehow resolves, a response with TTL of 64 set by the remote machine would never make it back anyway. Traceroute works by sending multiple pings or udp packets with different, increasing TTL values to give a complete picture of the route _towards_ the destination. Each router our packet passes through decrements its TTL value, and when that value reaches 0, the router sends back an ICMP response. It is sometimes useful to use ping and traceroute _on a router_ to see the route taken from their perspective. A response packet _from_ the destination might be routed over a different path. If a host cannot be pinged because its set to not send out ICMP in the firewall, traceroute can still be useful to determine the latency of the last hop that did respond. If the remote computer is down and doesn't respond to ARP, that last router will also usually send back an ICMP "host unreachable". The Windows command interpreter isn't "DOS". I would also never turn ping off. It's quite handy to troubleshoot speed or packet loss issues. Good routers can be set to limit the rate of echo messages sent to minimize flood.
You are awesome.. For protecting our privacy that our goverment violates everyday.. Everybody needs to protect themselves. Please teach us about cyber security.
You have listed the most important steps to do manual network mapping. But, I believe, consultants these days need an automated network discovery tool to map it, and then export it to Visio, PNG or any other formats they may like. There are quite a few network topology mapping tools out there!
Correct me if I'm wrong but the Time To Live (TTL) has nothing to do with time and everything to do with the number of hops the ping can survive for before being returned to sender. A hop is effectively a router in this scenerio. Traceroute works by sending a pings with a TTL of 1, then 2, then 3 and so on. Thats how it knows the route the packet takes ;) I've not explained as well as perhaps it could have been, but you can read more at www.grc.com/sn/sn-313.txt, about two thrids down, search for Traceroute.
Every protocol sent through tcp/ip network has a time to live = TTL, and that TTL number decreases after every device the protocol goes through and when it hits zero the protocol is destroyed
Enjoyed The Class! I Love Your Classes! My Brother learned from you and he told me to come here cause he said you are a god at everything computer related! Lol But hope to hear from you back!
Echo Request in a nut-shell: Q: Hey other computer, are you there? A1: "Yes, I'm here and I'm doing great." A2: "I'm here, but I'm fu*ked up bad, fam." A3: [ no response ]
Just fyi, the TTL isn't a stat in milliseconds.. rather, it's "router hops." It's a mechanism IP uses to ensure packets don't run around endlessly. When a router gets a packet, it lowers the TTL field in the header by 1. If doing so puts it to 0, it will send ICMP time exceeded back to the source. That's how trace route works. 3 packets are send with TTL of 1, and the first router sends back an error, which the tracert program shows as the first hop. Then it sends 3 packets with TTL of 2, etc
Yup. However, if it is a public network, windows computers have a setting called "public" which makes the firewall rules much more strict, you might not be able to do a port scan or the such, but you can tell that they are there, because they will still respond to ping requests.
I was able to land two jobs at the same time. I am going to go in depth in Database and User Interface theory in grad school and move away from help desk and tech support. Thanks
Cool tutorial, love it I have a feeling ill spend a lot of time on your channel. Little advice though if you haven't already figured it out. You should record record your sound in stereo sorry I was watching with headphones, and it was kind of annoying hearing only my left speaker outputting sound.
You aren't too old. You just have to keep learning. Right now everybody's getting involved in cloud systems. Learn about that. Actually, learn about everything about computer programming you can. Keep up to date with Java and everything misdirectionx talks about.You have to update yourself, sense technology is always chaging. Basicvally, keep watching youtube videos on this stuff.
There are some issues with ipconfig release where some computers do not seem to either release or request a new IP address properly. In windows 10, there is a function called "Reset network" which reinstalls the network card drivers among other things but it does solve the issue.
Better than a college education! I just graduated from UC Santa Barbara (a school within the top two percent of all schools in the nation) I was just thinking how that degree is worthless and how this information will further my subsistence far beyond what any university degree would. Please keep up the vids....They are extremely helpful to me as a newbie in the IT business. Also, I'm just curious, do you still own a computer repair shop? thanks
I'd like to say that for some companies and savvy computer users you can block ping request or ICMP requests to your router to better hide yourself. This can also give you an unreachable error as well.
Hey Eli. Question for u. I have my art router/gateway and then I have two routers connected directly to it making two separate private network running off that primary router gateway. If I connect a NAS DIRECTLY TO THAT ATT ROUTER/gateway, will all devices connected to the other two networks be able to access and share data file transfer etc? And if not what is missing to get the NAS accessibly by all networks connected to the att gateway?
Generally the IP would be the gateway, however if you run a tracert, you will see every router that information will run through. More the likely the first router would be the colleges something like 192.168.1.1. FYI, that IP will be a LAN ip not a public one.
hello Eli, I did a ping command to your everymanit.com from Toronto where I'm right now and there were 30 hops and one of the router responded with "request timed out". is that mean they have turned off ICMP inbound requests?
Is there a way to map a URL as a drive?? I have a WD My Cloud (NAS drive) and would like it to act like a drive (like it does when I'm on my home network) outside of my network. I can access this drive by going to mycloud.com, but when I try to map that address as a drive letter, it says it can't connect. How can I map this drive to work as a drive letter when I'm outside of my network? One example it with OneNote it syncs to this drive mapped as drive letter Y, I'd like to be able to open and access the notebooks like it does when I'm on my network over the internet.
Love your vids Eli...but if you happen to cover Audio editing/authoring in an upcoming segment, can you use this vid for the demo, and re-upload so my speakers aren't maxed out, where getting an email scares the shit outta me?
I've had a major issue getting the product keys retrieved from Office 2013. For software audits do you have any suggestions for software that works. I have tried lots of different key finders and none work for Office 2013.
Hey, love your videos and patience. could you please share the knowledge on How storage arrays like Dell EMC vmax used , mapping of LUNS ,eNAS , DWDM ,This provisioning etc..
around 31:05 in the command prompt i noticed that when you changed the TTL to 200 ms using "ping 10.1.10.1 -i 200" there was no change in the TTL output, it remained "TTL = 64". Did i miss something?
when i type in tracert www.google.com or any other domain i get abut 4 5 request timed out messages and then it connects to the domain, why am i getting these time outs?
Introduction (00:00) How Network Mapping Works (03:12) DOS Tools (11:44) Network Mapping Software (34:54) Security Considerations (44:14) Final Thoughts (48:21) Class Notes
Great videos, I'm hooked. But I have another question. If I disable ping request to my router will that prevent DoS attacks using IP stressing on my Xbox live games?
Forgive me, but I don't feel like SMB Shares were sufficiently explained in this video. Could you elaborate a bit more on how they related to Port-scanning and SNMP? Thanks
there are many dns servers how one dns server is connected to other if one of the the dns server is down when there is problem of same domain registered how this thing work is there only one major dns to control minor dns server
Hello Eli, ping times to my default gateway shows times between 7 & 44ms.. What does it mean? Is that to much or is it fairly normal? Your videos Rocks... thanks for sharing such usefull info. My best regards!
Actually its -w for setting the TIMEOUT. Time to live is how many hops, before the packet gets dropped. Traceroute actually works by pinging the host, with first a TTL of 1, 2 ,3 ,4 etc.
Really not happy with that definition of the PING's Time To Live (TTL) value. "If you have a high number you know that there's a delay in the system" Surely, if you have a high TTL in each PING response that means the journey involved very few hops. The TTL figure itself is informational. It's not necessarily a good or a bad thing, depending on what you're expecting. If you're PINGing a server in the same building I'd expect a high TTL figure due to probably only needing a single hop (likely the TTL would be 127, after a default Windows starting figure of 128). If the TTL figure was lower, then the PING was travelling over more than one hop. Still not necessarily a problem, but if the TTL figure was lower still, say 115, then the PING to your local server was using 12 hops, which I'd say was probably excessive and MAY indicate a problem. But, if I ping a server in Australia (I'm in London, England) then the TTL figure will be quite low ('ping www.abc.net.au' gave a TTL of 58, which is 128-58=70 hops, which sounds reasonable for a PING journey to the other side of the world!) What I think you mean to refer to is the 'Time=' value. To be fair, this is probably just because of in-front-of-camera nerves, and you do seem a bit nervous (I would be too), but this slip-up is a little more misleading than the SNMP slip-up I mentioned below. Unless I'm wrong. In which case, please correct me if I'm wrong... :)
3:35 ICMP
4:19 Echo Request
6:05 Port Scanning
7:02 SMB Shares
7:28 SNMP
11:01 Summary
12:12 DOS tools
23:35 3 DOS commands
25:30 CMD line ipconfig
29:07 CMD line ping
33:01 CMD line tracert
35:12 Network Mapping Software
39:00 PortScan
41:30 Spiceworks
44:26 Security
48:25 Final Thoughts
Marry me ?
Marry me ?
Marry me ?
its already there in the description
I love you Korono
Came from the future to say this video helped me in late 2023. Thanks a million
Dear Eli
Your tutorials are the most clear and exciting I have ever seen. You make me understand everything you demonstrate, explain and present. You have skills and great knowledge of real practicals of computer world. I'm impressed because I have been to other countries to study what I should have acquired sitting in front of my PC at home. Thanks for helping me understand better.
My left ear is filled with knowledge, my right is letting it all out
It helps if you put your finger in your right ear ;)
Ease of Access> Enable Mono Audio saved me :D
@@princegoyal8813 YOU ARE HIRED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! for helpdesk :D
half of my mouth can't stop laughing. Lol..
Clever
I appreciate everything you do so much Eli, thank you. I try to share your videos as much as possible. Thank you so much for everything you've taught me.
To hear the lesson on both ears, download the video and open it with the latest version of VLC (older version may not suppport this).
Then:
- Right click on the screen
- Audio
- Stereo Modality
- Left
So you will hear the sound from the left side on both hear when using headphones!.
Thank you Eli for your videos!!!
First of all, I must thank you. With this video series, you opened my mind to new possibilities that I was unable to consider before, making my complex nodes of thought to loosen their tight , making things easily understandable (to the point I wasn't able to concentrate on your talking cause I was thinking how to apply the beautiful things I just have understood). You're easily understandable thanks to the high PNL skill applied in your speech. While getting things really easier to understand you can even guide these poor sheeps to the village's marketplace! Thanks Computer guy, you have my trust!
I forgot... if you try to ping my IP from your Gate? Way, my ICMP will kindly deny your offer.
who on earth would dislike such videos!!
You know what makes him the best tech teacher on the web? No Indian accent.
Peter Terranova I’m a year late but I’m dead 😂😂😂😂
@@arifjay6756 im a year and 2 months late but wow that was funny.
Lol i feel bad for people trying to understand the accents especially thick native ones. I'm soo so thankful I can understand it because Indians do have an excellent and prolific grasp on IT, in general. So yeah I definitely feel for you guys! Ahahah
you know the struggle man :D
That's pretty racist
Mr.Eli.. ur like the teacher i never had.. til now ..!! ur the best.. thanks!!
A little tip for all new DOS users; typing "help" (not including the ""), alone or after a command, will give you options for that command. If typed alone, it gives a comprehensive list of commands. So for example; ping /help will give you a list of arguments for the ping command. Another essential DOS cmd set to know for networking would have to be to understand and know how to reset winsock and understand netsh.
my left ear loved this video
+1wsx10 I have the same problem, it really drive me crazy.
Install Audio EQ Chrome extension and select the option "Mono", it will play audio on both the channels.
You're a saint! I would add that if you are using headphones you may need to change the presets to headphones.
Ely. you are a natural teacher. It is great to listen and learn from you. The problem I have is I cannot organize your lessons in the right order, so I listen to different subjects as I find them...but, again - every lesson is always very well organized, professional etc. By the way, there is a problem with the fact that technology changes quickly, for example, in comm cables there is cat 7..(the red cable), but I understand that it is not possible for you to update, and it is really not that critical.
So thanks a million. Arik
Whew! This lesson took a while for me to digest.
Thanks for explaining everything really well.
Very informative and resourceful video. Instead of closing the command prompt just use 'CLS" command to clear that.
I'm almost certain that TTL in a ping is not a time-counter but a hop-counter. it means that a packet can pass so much hops until it dies, where each node it passes means one less TTL record. by default an ICMP gets on the road with 255 hops which includes both directions (i.e. 128 is max TTL you``ll see when there is only one router to pass) I may be wrong but I`m pretty sure I`m not
+willow klan Actually TTL is a time counter. The minimum amount that can be reduced is one second. Nowadays routers process packets in less than a second, that's why the TTL is reduced by one at every hop. Theoretically, if you somehow can stop the packet at your router for 3 seconds, then the TTL will be reduced by 3. I guess, nowadays it is not a mistake to consider TTL as a hop counter, but one should be aware of the underlying nature, just in case.
+Sergey Khegay reason for TTL is to kill packets that else would continue to go around forever. Each relay device (routers) shall reduce TTL by one each time they handle a packet. Sender sets initial value as wish. This is how tracert works. First paket has TTL=1, first device shall decrease it to 0 so you get an ICMP error message from this device and log it. Next comes TTL=2 so you get the error message from the SECOND device, counting outwards like an onion, and so on. tracert with maximum 30 hops means that it shall try up to 30 steps or TTL value before it stops it.
thanks for your time and effort man your videos are gold...
i love the key point links in the vid description for reference you are the best. I'm currently taking electrical engineering in school and am learning networking/ programming on the side this is so helpful due to my time constraints thank you much man
Awesome video. Thank you so much for uploading this. I was finally able to settle an argument with my cousin regarding discovering MAC addresses on a network.
@17:20 Time to live (TTL) doesn't indicate latency or delays in the system. It's how many hops the packet will take before giving up. The latency is indicated by the "time" field. Additionally, increasing the TTL will not increase the chances of a packet surviving a single flaky hop. Its just there to prevent networks from having immortal packets hopping around in circles.
Eli the computer Guy, YOU ARE VERY INTELLIGENT!!!
Dude - You're very good at training! Thank You!
my certs preps would be real hard if it wasnt for ur generous free lesons.... i thank u very much sir
Thank You! Your video and all the user comments made me realized I was wearing my headphones backwards.
very informative and helpful eventhough most of the videos is dated. Great job Eli...
My left ear loved this!
As an IT professional, these videos are great for getting perspective, handing off to the new guys to get them on a jump start, etc. However, as IT professionals, it usually requires headphone use at work and your audio is only left channel which is incredibly irritating.
YOU ARE THE BEST OR SHOULD I SAY A BEAST....... IN THE IT WORLD.... THANK A BUNCH... IM FOREVER THANKFULL.
Useful arguments to ping are *-t* to ping continuously until stopped, and *-w* to set the timeout. You can use ping in batch files to insert a pause of any length by pinging a non-existant network and waiting for a timeout w.
The TTL is hardly useful in ping because the default of 64 hops and timeout of 4s are plenty for any network. Australia is 20 hops and 350 ms away from europe. Furthest places like China might be 30-35 hops. If you placed 65 routers inbetween you and the destination, or a routing loop which somehow resolves, a response with TTL of 64 set by the remote machine would never make it back anyway.
Traceroute works by sending multiple pings or udp packets with different, increasing TTL values to give a complete picture of the route _towards_ the destination. Each router our packet passes through decrements its TTL value, and when that value reaches 0, the router sends back an ICMP response. It is sometimes useful to use ping and traceroute _on a router_ to see the route taken from their perspective. A response packet _from_ the destination might be routed over a different path.
If a host cannot be pinged because its set to not send out ICMP in the firewall, traceroute can still be useful to determine the latency of the last hop that did respond. If the remote computer is down and doesn't respond to ARP, that last router will also usually send back an ICMP "host unreachable".
The Windows command interpreter isn't "DOS". I would also never turn ping off. It's quite handy to troubleshoot speed or packet loss issues. Good routers can be set to limit the rate of echo messages sent to minimize flood.
I just discovered your channel and I think this is awesome. Great refresher course.
You are awesome.. For protecting our privacy that our goverment violates everyday.. Everybody needs to protect themselves. Please teach us about cyber security.
You have listed the most important steps to do manual network mapping. But, I believe, consultants these days need an automated network discovery tool to map it, and then export it to Visio, PNG or any other formats they may like. There are quite a few network topology mapping tools out there!
Excellent explanation ! this really helped me understand snmp and default gateway
Correct me if I'm wrong but the Time To Live (TTL) has nothing to do with time and everything to do with the number of hops the ping can survive for before being returned to sender. A hop is effectively a router in this scenerio.
Traceroute works by sending a pings with a TTL of 1, then 2, then 3 and so on. Thats how it knows the route the packet takes ;)
I've not explained as well as perhaps it could have been, but you can read more at www.grc.com/sn/sn-313.txt, about two thrids down, search for Traceroute.
Every protocol sent through tcp/ip network has a time to live = TTL, and that TTL number decreases after every device the protocol goes through and when it hits zero the protocol is destroyed
TTL in DNS is the amount of time certain data is stored as cache. This is defined in the SOA
God bless you, my brother in Christ.
thank you for this video, I am a younger person and I am very interested in the subject of fixing computers and applications, so thanks alot.
Subbed! Great great great talks you have here Eli... Technical, precise and interesting. A big thank you for your time and efforts you put on this.
Damn... this vid is definitely going to require 2 or 3 run throughs.
Enjoyed The Class! I Love Your Classes! My Brother learned from you and he told me to come here
cause he said you are a god at everything computer related!
Lol But hope to hear from you back!
Also to release the DNS cache you can use ipconifg /flushdns.
Eli just do cls to clear section :D , dont have to open and close ^_^
best tut on network mapping ive seen
Echo Request in a nut-shell:
Q: Hey other computer, are you there?
A1: "Yes, I'm here and I'm doing great."
A2: "I'm here, but I'm fu*ked up bad, fam."
A3: [ no response ]
Just fyi, the TTL isn't a stat in milliseconds.. rather, it's "router hops." It's a mechanism IP uses to ensure packets don't run around endlessly. When a router gets a packet, it lowers the TTL field in the header by 1. If doing so puts it to 0, it will send ICMP time exceeded back to the source. That's how trace route works. 3 packets are send with TTL of 1, and the first router sends back an error, which the tracert program shows as the first hop. Then it sends 3 packets with TTL of 2, etc
I simply adore u! You're the best person that explains it
Yup. However, if it is a public network, windows computers have a setting called "public" which makes the firewall rules much more strict, you might not be able to do a port scan or the such, but you can tell that they are there, because they will still respond to ping requests.
I was able to land two jobs at the same time. I am going to go in depth in Database and User Interface theory in grad school and move away from help desk and tech support.
Thanks
Cool tutorial, love it I have a feeling ill spend a lot of time on your channel. Little advice though if you haven't already figured it out. You should record record your sound in stereo sorry I was watching with headphones, and it was kind of annoying hearing only my left speaker outputting sound.
Best computer educational videos ever!
Very interesting class, excellent explanation, thank you very much
You aren't too old. You just have to keep learning. Right now everybody's getting involved in cloud systems. Learn about that. Actually, learn about everything about computer programming you can. Keep up to date with Java and everything misdirectionx talks about.You have to update yourself, sense technology is always chaging. Basicvally, keep watching youtube videos on this stuff.
This is very good intro to network mapping.
Love the vids... but I'm going to have to finish this one later. I need to go to the doctor because my right ear isn't working right.
This video is best viewed without headphones
Great stuff i am excited to make my debut
Thanks for your easy to follow videos.
There are some issues with ipconfig release where some computers do not seem to either release or request a new IP address properly. In windows 10, there is a function called "Reset network" which reinstalls the network card drivers among other things but it does solve the issue.
Better than a college education! I just graduated from UC Santa Barbara (a school within the top two percent of all schools in the nation) I was just thinking how that degree is worthless and how this information will further my subsistence far beyond what any university degree would. Please keep up the vids....They are extremely helpful to me as a newbie in the IT business. Also, I'm just curious, do you still own a computer repair shop? thanks
You are very practical. Thank you so much!
Great Video! it made me realize how important is my left ear
I'd like to say that for some companies and savvy computer users you can block ping request or ICMP requests to your router to better hide yourself. This can also give you an unreachable error as well.
I'd like to add on that there are alternative ways to ping to workaround the ICMP blockage if you use software like nmap.
Hey Eli. Question for u. I have my art router/gateway and then I have two routers connected directly to it making two separate private network running off that primary router gateway. If I connect a NAS DIRECTLY TO THAT ATT ROUTER/gateway, will all devices connected to the other two networks be able to access and share data file transfer etc? And if not what is missing to get the NAS accessibly by all networks connected to the att gateway?
you're saving my life. tysm!!!!
Thank you, really good explanation!
Generally the IP would be the gateway, however if you run a tracert, you will see every router that information will run through. More the likely the first router would be the colleges something like 192.168.1.1. FYI, that IP will be a LAN ip not a public one.
Thanks for sharing Eli... so very wise
I'd be curious to know how all the information about hosts computers are broadcasted so that the management software can grab all that information.
great instruction as always Eli!
I would really enjoy watching an overview of CommView for WiFi
hello Eli,
I did a ping command to your everymanit.com from Toronto where I'm right now and there were 30 hops and one of the router responded with "request timed out". is that mean they have turned off ICMP inbound requests?
Nice tutorials, well done! But could you fix the stereo audio thing?
Is there a way to map a URL as a drive?? I have a WD My Cloud (NAS drive) and would like it to act like a drive (like it does when I'm on my home network) outside of my network. I can access this drive by going to mycloud.com, but when I try to map that address as a drive letter, it says it can't connect. How can I map this drive to work as a drive letter when I'm outside of my network?
One example it with OneNote it syncs to this drive mapped as drive letter Y, I'd like to be able to open and access the notebooks like it does when I'm on my network over the internet.
Eli do you have a blog, or website. I think if you put all you lectures on a website, there will be no confusion to watch the videos step by step.
go to his channel and under playlists do crtl+f and type hacking. he made a playlist in order with all these tutorials.
Thanks a lot
Love your vids Eli...but if you happen to cover Audio editing/authoring in an upcoming segment, can you use this vid for the demo, and re-upload so my speakers aren't maxed out, where getting an email scares the shit outta me?
snmpv3 is a good work around for security purposes, snmp 1 and 2 are unsecure due to not having encryption I think.
I've had a major issue getting the product keys retrieved from Office 2013. For software audits do you have any suggestions for software that works. I have tried lots of different key finders and none work for Office 2013.
Hey, love your videos and patience. could you please share the knowledge on How storage arrays like Dell EMC vmax used , mapping of LUNS ,eNAS , DWDM ,This provisioning etc..
But as per usual... Eli, thank you. JUST THANK YOU!!!
Amazing Class, thanks Eli
around 31:05 in the command prompt i noticed that when you changed the TTL to 200 ms using "ping 10.1.10.1 -i 200" there was no change in the TTL output, it remained "TTL = 64". Did i miss something?
when i type in tracert www.google.com or any other domain i get abut 4 5 request timed out messages and then it connects to the domain, why am i getting these time outs?
Your videos are very useful!! thank you!
Great video, just to point out TTL is counter instead of time in reality.
Hi,
When you entered ping 10.1.10.1 -i 200
isn't the TTL suppose to be 200?
Can you please explain that? Why is it 64 still?
Introduction (00:00)
How Network Mapping Works (03:12)
DOS Tools (11:44)
Network Mapping Software (34:54)
Security Considerations (44:14)
Final Thoughts (48:21)
Class Notes
Great videos, I'm hooked. But I have another question. If I disable ping request to my router will that prevent DoS attacks using IP stressing on my Xbox live games?
hi Eli,
can i map a network just by connecting to the wireless point? all the computers on that wireless network?
Smashing explanation.
Forgive me, but I don't feel like SMB Shares were sufficiently explained in this video. Could you elaborate a bit more on how they related to Port-scanning and SNMP? Thanks
Thanks for the great class!
there are many dns servers
how one dns server is connected to other
if one of the the dns server is down when there is problem of same domain registered
how this thing work
is there only one major dns to control minor dns server
Is there an updated version of this?
Hello Eli, ping times to my default gateway shows times between 7 & 44ms.. What does it mean? Is that to much or is it fairly normal? Your videos Rocks... thanks for sharing such usefull info. My best regards!
Computer guy thanks for you video.
very very very cool video lesson!!!!!!!!!!!!!!!!!!!!!
Great delivery.
Actually its -w for setting the TIMEOUT. Time to live is how many hops, before the packet gets dropped.
Traceroute actually works by pinging the host, with first a TTL of 1, 2 ,3 ,4 etc.
Really not happy with that definition of the PING's Time To Live (TTL) value. "If you have a high number you know that there's a delay in the system"
Surely, if you have a high TTL in each PING response that means the journey involved very few hops. The TTL figure itself is informational. It's not necessarily a good or a bad thing, depending on what you're expecting. If you're PINGing a server in the same building I'd expect a high TTL figure due to probably only needing a single hop (likely the TTL would be 127, after a default Windows starting figure of 128). If the TTL figure was lower, then the PING was travelling over more than one hop. Still not necessarily a problem, but if the TTL figure was lower still, say 115, then the PING to your local server was using 12 hops, which I'd say was probably excessive and MAY indicate a problem.
But, if I ping a server in Australia (I'm in London, England) then the TTL figure will be quite low ('ping www.abc.net.au' gave a TTL of 58, which is 128-58=70 hops, which sounds reasonable for a PING journey to the other side of the world!)
What I think you mean to refer to is the 'Time=' value.
To be fair, this is probably just because of in-front-of-camera nerves, and you do seem a bit nervous (I would be too), but this slip-up is a little more misleading than the SNMP slip-up I mentioned below.
Unless I'm wrong. In which case, please correct me if I'm wrong...
:)
Request:
I have questions of Network + so i need help me to solve these I can can send it by E-mail or FB or any method you want
Thank you
Jeff Im not an expert, but I too agree the TTL explanation is off.
Spiceworks info starting at 41:25
very good... I like all ur videos. how mch time does it take you to master all these things?