Keep up the good work mate. Its by far the best IT channel on youtube. I have learned so much from your amazing videos. Please keep the videos coming in! :)
Yes, but probably within that 4 hours You have learned tracert in much more detail. It`s like comparing 9 min video to 20 pages of Cisco material. Go and watch from this channel all networking materials, and try to pass CCNA exam :)
One thing to add is that the way it determines the hops is by sending a ping with the TTL (Time To Live) set to 1 to the destination. The first hop decrements the TTL to 0 and sends an ICMP TTL exceeded message. The host then sends another ping with the TTL set to 2 so the second hop will send the ICMP(Internet Control Message Protocol) TTL exceeded message. Wash rince repeat until destination is reached or the max hop count is reached (default is 30) The messages do not start with the TTL set to 30, that is just what the program will limit the maximum TTL to by default. IE if you do -H 4 it still will send the first ping with a TTL of 1 so that the first hop will decrement and send the ICMP TTL exceeded message. Then 2 3 and 4 so the trace route will end at the fourth hop. If intersted according to RFC 792 the type/code of TTL exceeded is Type 11 Code 0. IMHO this video would be much better with a wireshark capture of a real tracerroute showing the TTL exceeded and the ICMP TTL exceeded messages; however, I get that this is just a basic introduction. Sorry this is so long.
Your comment plus this video have saved me many hours of work and research to build my own traceroute for a course. I don't know why my college can't use plain language explanations and simple but descriptive videos... anyway thank you so much!
Thanks for amazing videos sir ..and we are waiting for cyber security course ,please upload videos for cyber security or ethical hacking and like some tools like splunk and crowd strike
God damn, this channel is the best! No fluff just straight to the point. I feel like learning is so effortless watching these videos, where as others my mind starts to wander.
You haven't explained that "Traceroute sends packets with TTL values that gradually increase from packet to packet, starting with TTL value of one. Routers decrement TTL values of packets by one when routing and discard packets whose TTL value has reached zero, returning the ICMP error message ICMP Time Exceeded. Proceeding in this way, traceroute uses the returned ICMP Time Exceeded messages to build a list of routers that packets traverse, until the destination is reached and returns an ICMP Echo Reply message."
Very well explained, but I think the reason he did not incuded that was because of the time. In youtube, peole usually watch videos that are around 10-15 minutes. U cant explain everything in this time. But hey, he still explained a lot, which u can only find, after reading through so many websites.
2000 Years Later... Six and a half hours later... A few inches later... Day 2! Day 3! Day 4! A few moments later... One Eternity Later... 3 days later... 12 seconds later... 3:28 AM! 3 weeks later... Many months later... So much later that the old narrator got tired of waiting, and they had to hire a new one! Tomorrow! Tomorrow for sure... Eventually... Uh... 12:00 midnight! 1 hour later... 2 hours later... 3 hours later... While patchy pulls himself together, let's see how SpongeBob's party is shaping up. Meanwhile... 2 hours later... 8:01 PM! The next day... Later... 20 minutes later... 6 hours later... Several bad puns later...
This video series helped me to pass my a+ 1001 exam yesterday i scored 796 out of 900 just wanted to say thank you so much this is such a good channel the way how you describe the content in a easy way really helped once again thank you.
About TTL. That's exactly how tracert works itself: * It sends request with a TTL 1 so that's how you get echo from the first hop * Then it sends a request with a TTL of 2 so that's how you get echo from the second hop ... and so on
Hi, I'm Tharshan from sri lanka.. I'm a Computer Hardware and Network Technician.... I love lots of the this channel.... Because this is a most useful channel on IT students.... & Great job... ❤️❤️❤️ And I need computer hardware videos please... Put the video??
Honestly, you are one of the best online networking tutorials that I am looking for. You explained simply and included clearly images that gave me ease of understanding. Thanks a lot. Best wishes for you.
i am having a issue with my ping, my friend lives in the same city but has a different isp. he gets 15 to 20 ping whereas i get 35 t0 40 ping, how should i explain this to my isp?
Keep up the good work mate. Its by far the best IT channel on youtube. I have learned so much from your amazing videos. Please keep the videos coming in! :)
Hi thanks for sharing I love your videos and your explanations so clear that I’m able to understand!🤗What do you think about Fing app? Thank you a lot🙏🏻❤️🦋
I sure hope so because once the satellites are hopping outside of terrestrial TCP/IP via laser light in a vacuum (faster than light through glass), it will bypass terrestrial backbones. They will have the opportunity to dynamically adjust where the data returns to surface based on congestion kind of like google maps and traffic jams. It will be interesting for sure.
One thing I've always had trouble with was where do your packets go once it leaves your gateways. I know it hits like a PoP before hitting your ISP, but who are these routers and where are they located?
You can't establish a direct connection to a remote address. That's like you can't travel just by using one street. In some cases you can - but in most situations - you MUST change streets or you will not get where you want to get.
@@igorthelight Right I get that. But do I piggyback off some Jo Shmo's router down the street, or is there some kind of infrastructure your isp has put into place to route your traffic? Could I go knock on their door and say, "Excuse me, sir I don't like the way you're handling my packets, would you please stop?" If so who are they and where are these infrastructure routers located?
I'm always in search for Network basics being a so called Network Engineer, I never knew how ping really works before this video , I never knew how Traceroute works , In-Depth difference between Traceroute and Ping . Never knew what purpose Time to Live , in-fact Never knew how Round Trip Time works before . All within 10 minutes . RESPECT to you sir . Could you pls post lot Networking stuffs
It depends on why the connection is slow in the first place. It could be a slow connection between the device and router, a slow/bad connection between the router and ISP, or the internet connection you're paying for is just slow to begin with. Its hard to give an exact answer without knowing all the details. How are you running a speed test? Wired or wifi? Are the speeds you're getting on the tests close to what you should be receiving?
So if its configured to (100% of the sites I tracert'd) to 30 hops max, what does it mean that the TTL value showing in ping being higher, for example TTL=41 ??? Anyone please?
When I do this, the packet times don't increment; they go up (say 17ms) then down on the next hop (say 15ms) then up again on the next hop (say 18ms), then back down again on the next hop (say back to 17ms again). I also notice that first hop to my home router takes between 3 and 4 ms, which seems like a relatively long time. Does this mean anything or is it normal?
The purpose of using Traceroute (tracert) in network troubleshooting is to identify and troubleshoot network problems by tracing the route taken by packets of data from your computer to a destination on the Internet. The different stages involved in this process include sending a sequence of packets with decreasing TTL values, receiving responses from each router along the path, and pinpointing where a connection issue or network disconnection may be occurring.
How does an operating system read a code like c++, Js,.. And how does the computer translate the code in a binary format and and retranslate it as a computer program (game engine, word,... ) Could you pleas answer these two questions if you know the answer ?
lets say I route over 50 routers to reach my destination, when I make these 50 routers invisible to pings by making them not react to it via firewall: a) I reach my destination faster cuz the routers that cant be pinged get skipped? b) I still route over 50 routers but different routers cuz they cant be pinged? c) I still route over the same 50 routers just without you seeing them in your tracert result cuz they are invis to pings? d) I still route over the same 50 routers and you still see them in your tracert result? (like it has no impact at all)
We are using Act Fibernet tried the trace route i get reply until hop count 12 but after that i am getting request timed out , so it not able to reach the final destination. The ISP is saying its not they are issue but our Company IT is stating that the issue with ISP. we have other ISP s like JIO and Airtel , here we are able to connect to Office applications not sure where the issue lies. Hope you can guide us
But what's the point, you think you have a problem and the tracert confirms there's a problem somewhere on the planet. Unless you know someone with the bad routers you can't do anything about it?
Is this how we limit the trace to 4 hops (for example)????? or is it when we run the trace hop at 4, and run the command, we are just seeing only 4 of the hops and it is still going to do all the hops to get to the end server?.. IF it does not limit it..is there a way we can bypass all of the hops and shorten the distance to the end server?. I called my ISP provider and they said there is nothing they can do on their end. I need to clear up the bottle necks and i dont know how..some of my ms were in the 200's.
I ping local IP address but it continuously pinging infinitely, in your video it stopped when all steps to destination back to computer reached. Any explanation?
One of the channels where dislike button is actually a good thing to be disabled - because if i would see i dislike here for this job and effort by this amazing guy, i would be really mad
Guys need help, in short I have aDSL Internet at home with a maximum rate of speed that is 2 Mbps Yes it is high, and connected gaming rate, the crux of the issue is that in Steam when you games due to the game rate 8 Mbit shakes, there is what may be the option for Internet sharing to give this speed ? Maybe you need to register something in the router, like some port or server, I think theoretically it is possible
I don't know how I ended up here, but I'm glad RUclips brought me here. Your videos not only gave me refresher info but also brought back so many memories from the past. Gonna binge watch the entire channel. Thank you so much for these videos. I'm sure students today will greatly benefit from all of these.
5 18 ms 23 ms 11 ms 27.129.45.85 6 14 ms 16 ms 47 ms 202.97.80.229 7 * * * 请求超时。 8 * * * 请求超时。 9 * * * 请求超时。 10 * * * 请求超时。 11 * * * 请求超时。 12 * * * 请求超时。 .................................................... that's what i received when i tried your direction. maybe because i used VPN in China ??? please explain to me
Get the VPN that I use (affiliate). nordvpn.com/powercert
64% off a 2-year plan + 4 months free.
Next video idea.
Subnet Mask
Keep up the good work mate. Its by far the best IT channel on youtube. I have learned so much from your amazing videos. Please keep the videos coming in! :)
Got you. Nice job thanks for being there
very nice. hope you create ccna videos
Please explain about Massive MIMO
Protect this channel at all costs.
Does tracert work on vpn addresses?
😊true
My professor had a four hour lecture on traceroute, you just explained it much clearer in 9 minutes. Well done.
😂
Because geniuses won't need any recognition from anyone.
I agree more videos plz 🥺👉🏽👈🏽
Yes, but probably within that 4 hours You have learned tracert in much more detail.
It`s like comparing 9 min video to 20 pages of Cisco material. Go and watch from this channel all networking materials, and try to pass CCNA exam :)
How do you spend 5 hours explaining this lol
You explained way easier than books !!!
You literally make more sense in less than 30 minutes than my professors do in an entire semester 😭
i’m calling this now. youtube’s gonna release it’s own centralized version of college
"centralized " is a bad idea.
That it's main strength that it's highly decentralized - that means that it's not controlled by a single entity.
Your content is highly appreciated!
Keep up the great work sir.
Much appreciated!
One thing to add is that the way it determines the hops is by sending a ping with the TTL (Time To Live) set to 1 to the destination. The first hop decrements the TTL to 0 and sends an ICMP TTL exceeded message. The host then sends another ping with the TTL set to 2 so the second hop will send the ICMP(Internet Control Message Protocol) TTL exceeded message. Wash rince repeat until destination is reached or the max hop count is reached (default is 30) The messages do not start with the TTL set to 30, that is just what the program will limit the maximum TTL to by default. IE if you do -H 4 it still will send the first ping with a TTL of 1 so that the first hop will decrement and send the ICMP TTL exceeded message. Then 2 3 and 4 so the trace route will end at the fourth hop. If intersted according to RFC 792 the type/code of TTL exceeded is Type 11 Code 0. IMHO this video would be much better with a wireshark capture of a real tracerroute showing the TTL exceeded and the ICMP TTL exceeded messages; however, I get that this is just a basic introduction. Sorry this is so long.
Your comment plus this video have saved me many hours of work and research to build my own traceroute for a course. I don't know why my college can't use plain language explanations and simple but descriptive videos... anyway thank you so much!
I never read or watched a better explanation than this,
This channel is amazingly helpful.
Thanks
Glad you think so!
What I love the most about these videos is I already know so much about them, but I'll always find little bits here and there that I never knew.
RUclips should consider itself honoured by having this channel on its platform. Remarkable
Thanks for amazing videos sir ..and we are waiting for cyber security course ,please upload videos for cyber security or ethical hacking and like some tools like splunk and crowd strike
God damn, this channel is the best! No fluff just straight to the point. I feel like learning is so effortless watching these videos, where as others my mind starts to wander.
This is how every lecturer and teachers should teach. You're doing a great job sir, keep it up. Im the first student if you open a training institute.
My brain craves for more content like this, keep up the good work! :)
As an IT guy, watching just for entertainment and killing Sunday breakfast time... Nicely done vid!
Same!
Great explanation tho :-)
God bless your soul. Keep posting more videos. We are waiting. God bless you again. 🙏 Namaste
You haven't explained that "Traceroute sends packets with TTL values that gradually increase from packet to packet, starting with TTL value of one. Routers decrement TTL values of packets by one when routing and discard packets whose TTL value has reached zero, returning the ICMP error message ICMP Time Exceeded. Proceeding in this way, traceroute uses the returned ICMP Time Exceeded messages to build a list of routers that packets traverse, until the destination is reached and returns an ICMP Echo Reply message."
Very clever algorithm!
Very well explained, but I think the reason he did not incuded that was because of the time. In youtube, peole usually watch videos that are around 10-15 minutes. U cant explain everything in this time.
But hey, he still explained a lot, which u can only find, after reading through so many websites.
The leader in explaining information! Thank you
Take A Bow 🙏 Your Explanation Is Very Clear & Understandable For Me Totally Sir.
2000 Years Later...
Six and a half hours later...
A few inches later...
Day 2!
Day 3!
Day 4!
A few moments later...
One Eternity Later...
3 days later...
12 seconds later...
3:28 AM!
3 weeks later...
Many months later...
So much later that the old narrator got tired of waiting, and they had to hire a new one!
Tomorrow!
Tomorrow for sure...
Eventually...
Uh...
12:00 midnight!
1 hour later...
2 hours later...
3 hours later...
While patchy pulls himself together, let's see how SpongeBob's party is shaping up.
Meanwhile...
2 hours later...
8:01 PM!
The next day...
Later...
20 minutes later...
6 hours later...
Several bad puns later...
The only channel and instructor that explains each lesson with 100% clarity that is understandable to everybody. love it.
This video series helped me to pass my a+ 1001 exam yesterday i scored 796 out of 900 just wanted to say thank you so much this is such a good channel the way how you describe the content in a easy way really helped once again thank you.
Nice. Congrats. Thanks :)
Well Explained, Sir!
Please make a video on slaac(stateless address autoconfiguration protocol) sir.
Please make a video about subnets and the difference between them and vlans.
About TTL.
That's exactly how tracert works itself:
* It sends request with a TTL 1 so that's how you get echo from the first hop
* Then it sends a request with a TTL of 2 so that's how you get echo from the second hop
... and so on
Not echo, but "Destination unreachable" error.
@@semibiotic Thanks!
WHAT ARE THOSE ROUTERS in between client and destination ? Who owns them? Logically?where are they? Plz explain someone.
Big companies....internet service providers...AT&T.....etc
You deserve to be spread every corner of the world. Love your clarity of knowledge man.
Clean, Simple and Understandable.. I wish having a professor like you would be awesome. 🥰
And I have a QUESTION : Where are the intermediary routers lie between my home router and Google server (i.e: 2nd, 3rd, 4th, 5th, 6th and 7th hub)?
1st is your Wifi router
2nd is ISP
3rd Data exchange center of regional ISP
4th Inter continental Data exchange center
@@vaibhavpatil9956 Ok, Thanks much
just awesome, couldnt thank enough .You earned a sub
You should make videos everyday, I just can't get enough of it. I can watch your channel non stop for hours. Well done dude
Hi, I'm Tharshan from sri lanka..
I'm a Computer Hardware and Network Technician....
I love lots of the this channel.... Because this is a most useful channel on IT students.... & Great job... ❤️❤️❤️
And I need computer hardware videos please... Put the video??
Damn i was reading all this stuff for hours . Open this video and in 9min everything is explained
And also explain that how a network working, (process of network).
And explain OSI MODEL LAYR we have confusion in osi model LAYR
Amazing , really easy and understandable, thank you so much for your hard work
In only nine minutes I went from never even having heard of Traceroute, to understanding it and testing it my own computer. Cool!
Honestly, you are one of the best online networking tutorials that I am looking for. You explained simply and included clearly images that gave me ease of understanding. Thanks a lot. Best wishes for you.
Thanks Thanks Thanks, good explanation with visuals
i am having a issue with my ping, my friend lives in the same city but has a different isp. he gets 15 to 20 ping whereas i get 35 t0 40 ping, how should i explain this to my isp?
If only the like button allows thousand clicks! Awesome videos as always
I Just Found the Best RUclips Channel Ever!
This explanation is top-notch. Thanks. I just subscribed.
Keep up the good work mate. Its by far the best IT channel on youtube. I have learned so much from your amazing videos. Please keep the videos coming in! :)
The absolute best channel for visual learners like me. Thanks so so much for what you do!
Happy to hear that!
Hi thanks for sharing I love your videos and your explanations so clear that I’m able to understand!🤗What do you think about Fing app? Thank you a lot🙏🏻❤️🦋
Will Starlink improve tracerouting?
I sure hope so because once the satellites are hopping outside of terrestrial TCP/IP via laser light in a vacuum (faster than light through glass), it will bypass terrestrial backbones. They will have the opportunity to dynamically adjust where the data returns to surface based on congestion kind of like google maps and traffic jams. It will be interesting for sure.
Your channel chaged my life ❤
I recommend using MTR - My Trace Route as a more advanced tool than just traceroute
One thing I've always had trouble with was where do your packets go once it leaves your gateways. I know it hits like a PoP before hitting your ISP, but who are these routers and where are they located?
You can't establish a direct connection to a remote address.
That's like you can't travel just by using one street. In some cases you can - but in most situations - you MUST change streets or you will not get where you want to get.
@@igorthelight Right I get that. But do I piggyback off some Jo Shmo's router down the street, or is there some kind of infrastructure your isp has put into place to route your traffic? Could I go knock on their door and say, "Excuse me, sir I don't like the way you're handling my packets, would you please stop?"
If so who are they and where are these infrastructure routers located?
@@scubasteveVII I agree that that's kinda shady.
I'm always in search for Network basics being a so called Network Engineer, I never knew how ping really works before this video , I never knew how Traceroute works , In-Depth difference between Traceroute and Ping . Never knew what purpose Time to Live , in-fact Never knew how Round Trip Time works before . All within 10 minutes . RESPECT to you sir . Could you pls post lot Networking stuffs
This was really interesting. Though how do you try to improve speeds?
It depends on why the connection is slow in the first place. It could be a slow connection between the device and router, a slow/bad connection between the router and ISP, or the internet connection you're paying for is just slow to begin with. Its hard to give an exact answer without knowing all the details. How are you running a speed test? Wired or wifi? Are the speeds you're getting on the tests close to what you should be receiving?
You are a good teacher. Love your contents 🙂
Ohhhh myyyy gooosssshhh....
What I found on an Internet.......A pearl in the barren desert🥺🥺🥺🥺💔💔💔❤️❤️❤️❤️❤️❤️
The best explanation I have seen. Keep up the good work!!
WHAT ARE THOSE ROUTERS in between client and destination ? Who owns them? Logically?where are they? Plz explain someone.
Nice explanation!! 10/10
So if its configured to (100% of the sites I tracert'd) to 30 hops max, what does it mean that the TTL value showing in ping being higher, for example TTL=41 ??? Anyone please?
This is the easiest to understand tech channel on RUclips. PLEASE WRITE BOOKS! LOTS AND LOTS OF BOOKS!
When I do this, the packet times don't increment; they go up (say 17ms) then down on the next hop (say 15ms) then up again on the next hop (say 18ms), then back down again on the next hop (say back to 17ms again). I also notice that first hop to my home router takes between 3 and 4 ms, which seems like a relatively long time. Does this mean anything or is it normal?
Awesome... Kindly make video on new technology & processor ( computer).. Humble 🙏request
The purpose of using Traceroute (tracert) in network troubleshooting is to identify and troubleshoot network problems by tracing the route taken by packets of data from your computer to a destination on the Internet. The different stages involved in this process include sending a sequence of packets with decreasing TTL values, receiving responses from each router along the path, and pinpointing where a connection issue or network disconnection may be occurring.
How does an operating system read a code like c++, Js,..
And how does the computer translate the code in a binary format and and retranslate it as a computer program (game engine, word,... )
Could you pleas answer these two questions if you know the answer ?
Very informative. If you are running Traceroute in a Linux CLI you will have to spell out Traceroute, the tracert cmd won't work.
lets say I route over 50 routers to reach my destination, when I make these 50 routers invisible to pings by making them not react to it via firewall:
a) I reach my destination faster cuz the routers that cant be pinged get skipped?
b) I still route over 50 routers but different routers cuz they cant be pinged?
c) I still route over the same 50 routers just without you seeing them in your tracert result cuz they are invis to pings?
d) I still route over the same 50 routers and you still see them in your tracert result? (like it has no impact at all)
We are using Act Fibernet tried the trace route i get reply until hop count 12 but after that i am getting request timed out , so it not able to reach the final destination. The ISP is saying its not they are issue but our Company IT is stating that the issue with ISP. we have other ISP s like JIO and Airtel , here we are able to connect to Office applications not sure where the issue lies. Hope you can guide us
Ping is working but tracert is not working. However we have icmp bidirectionally at LAN Firewall. Any idea what could be the reason ?
WOW WOW WOW🔥. What an explanation!. I wished I would have come crossed this account earlier 😭 Thank you so much Team @PowerCert Animated. 🙏
fun fact - if you type 0.0.0.0 Google.com into c:\windows\system32\drivers\etc\hosts you will turn off the internet 😁📴👻
But what's the point, you think you have a problem and the tracert confirms there's a problem somewhere on the planet. Unless you know someone with the bad routers you can't do anything about it?
Is this how we limit the trace to 4 hops (for example)????? or is it when we run the trace hop at 4, and run the command, we are just seeing only 4 of the hops and it is still going to do all the hops to get to the end server?.. IF it does not limit it..is there a way we can bypass all of the hops and shorten the distance to the end server?. I called my ISP provider and they said there is nothing they can do on their end. I need to clear up the bottle necks and i dont know how..some of my ms were in the 200's.
I ping local IP address but it continuously pinging infinitely, in your video it stopped when all steps to destination back to computer reached. Any explanation?
This is wildly helpful. A bunch wheels just clicked in my brain 😂. THANK YOU!!!
You made this a lot easier, was stuck in understanding traceroute since hrs. but this 9 min. video did wonders. Thanks again.😇
Again, outstanding easy to understand video. Thank you.
you are the best. So simple so awesome
Thank you
Now now now. So so so.
One of the channels where dislike button is actually a good thing to be disabled - because if i would see i dislike here for this job and effort by this amazing guy, i would be really mad
#Question
When would you cover the Apple computer parts? All for our vast knowledge.
This is so good. I'm having issues and wanted to figure out where it is as gaming is becoming frustrating and I think virgin media are lying to me.
The people are demanding more.....We need more..... Please update your network + and a+ and also add security +
Guys need help, in short I have aDSL Internet at home with a maximum rate of speed that is 2 Mbps Yes it is high, and connected gaming rate, the crux of the issue is that in Steam when you games due to the game rate 8 Mbit shakes, there is what may be the option for Internet sharing to give this speed ?
Maybe you need to register something in the router, like some port or server, I think theoretically it is possible
I know it's off topic but I think you can help
Whenever I forget the tracert command functions, I just go straight to this bookmarked video.
Literally the most useful channel on RUclips.
Hi Sir,
Do you have online class we can take or something like udemy? if anyone else knows, please let me know.
Hi Sir Nice videos.
Can u pls male 1 video how trouble shoot network slowness
and which tool we can use
when I run tracert on my computer, none of the columns have the ever-increasing amount of time in ms. They are all over the place.
Please explain TTL , Destination Net Unreachable (DNU), TTL expire in transit
Thanks a lot your video was of great help but couldn't find your Twitter handle to follow
I don't know how I ended up here, but I'm glad RUclips brought me here. Your videos not only gave me refresher info but also brought back so many memories from the past. Gonna binge watch the entire channel.
Thank you so much for these videos. I'm sure students today will greatly benefit from all of these.
Is there anything that can be done once you pinpoint which router in the path is causing the lag ?
If it's out on the internet, you can't do anything. It's up to which organization owns it.
Nice! Thank you for this. Exactly what I needed!
Best channel
Is it weird then when I run this to various websites it only ever shows 2 results the first being my router and the second being the destination?
Path ping - ip address command is useful too, same thing as tracert if I'm not mistaken
5 18 ms 23 ms 11 ms 27.129.45.85
6 14 ms 16 ms 47 ms 202.97.80.229
7 * * * 请求超时。
8 * * * 请求超时。
9 * * * 请求超时。
10 * * * 请求超时。
11 * * * 请求超时。
12 * * * 请求超时。
....................................................
that's what i received when i tried your direction. maybe because i used VPN in China ??? please explain to me
I always wondered who determines the route?
I thought tracert showed you peoples IP Address and their connection speed, when connected to a certain site?
Hi, when traceroute is being runned and in between the hops we get a ( * 3ms 6ms) what can be the reason?