Central Source NAT (SNAT) and Destination NAT (DNAT/VIP)
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- Опубликовано: 14 июн 2020
- My video about differences between profile and policy mode brought out some very important questions about central NATing. This video dives into what central Source NAT and Destination NAT (also known as Virtual IP) are and the benefits of it.
You can run central NAT in either mode, profile or policy. Policy mode forces you to use it while you have the option on profile mode to use standard or central NAT.
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Do you use central SNAT and DNAT? Tell us about your setups as well as the pros and cons you have experienced while utilizing this!
My experience has been that it is most commonly used when a user is doing policy conversion from CheckPoint to FortiGate. Great video by the way.
Thanks
How security policy will be for DNAT?
I am looking at Enabling SNAT so I can setup a "Hairpin NAT Policy" for mobile devices on our guest Wifi network to be able to hit our Exchange EAS service. This is so our employees can use our wifi to get email on their mobile devices as some of our buildings do not have good cell coverage inside, but they have good wifi on the guest network. I have tried this using the default profile based setup but cannot get the NAT to work, It will NAT on the way in to the exchange server but not on the way out of the guest network.
Great video. Very informative!
Man, you're so good at explaining things. Love this channel.
We use both SNAT and DNAT extensively. DNAT allows us to expose external services provided by third parties using an IP we allocate. This simplifies inter-site routing and if the 3rd party change the IP/FQDN we simply update the DNAT. We've not used Central NAT yet but this looks very interesting 👍🏻
Hey Mike, Thank You for the the videos, I really enjoy these types of videos because it helps me to learn the most. Thanks, Chris. :-)
Very welcome
Mike, thanks so much. I usually read through the FortiGate documentation and call support but this video (like others) has been exceptionally helpful!
Awesome to hear!
Thanks, that was easy to understand
This video helped me understand Central NAT, but it doesn't cover that it needs to be enabled first. Still very helpful Central NAT = SNAT is my mental note.
Great stuff mate!
Thanks!
Good stuff. I just learned about it several weeks ago. I was initially wondering why doesn’t Fortigate have separate NAT table where I create NAT rule like the other vendor do. After researching, I found out they did. Your videos are awesome by the way. Keep up the good work.
Thanks. Trying to help however I can!
Thanks Mike for video. I have a question. How to nat/pat to redirect any dns to a specific external ip?
Thanks Mike! Can you please make few videos on CPU profiling of fortigate.
For DNAT you should explain that the internal address object is now selected in the policy as destination rather than a VIP object as in non-Central nat mode ...
Great idea
The exact question on my mind.
It took me a while to realize that when we moved from Check Point to FortiNet.
What exactly is source interface filtering used for on DNATs? I was thinking it was if you were specifying an incoming interface of any then target multiple ports in the filter maybe. I could see scenarios where you might have multiple uplinks from the firewall to the same internet connection.
Please do u have a video on vlans with internet access and url feltering
I am currently not using central nat, however that's is something I looking forward I would like to implement as it look to be much "cleaner" However something I am wondering and I haven't look at yet, would it be possible to enable central nat and have "policy nat" at the sametime, I guess not ! and therefore that become a problem when you want to change the way of doing your nating
how dnat works here is it like ASA where it unnat first then we open acl for the original ip?
i'm running 6.0.x and see Central NAT still needs to be turned on in CLI, and you cannot have any VIP or IP pools configured. Wondering if that is still the case in 6.4.x. Disabling it will delete all your DNAT and VIPs. So backup if you want a go at this. ;-)
Can we configure SNAT (IPPOOL) and Destination NAT (VIP) for the same flow in a single Fortigate FW ?
Hi Mate, Do we need a firewall policy for Central DNAT ? Just trying to implement it and wanted to see as i am having a bit of issue with implementing .
I have a Fortigate 100F 6.4.4 that is configured in Profile-based but Central SNAT is disabled. If I enable it would change my current NAT rules that are configured in the policies? This feature allows me to create a subnet-to-subnet deterministic mapping (1:1)?
Did we use DNAT with CNAT?
I have a current issue that I am trying to connect to my company's NAS within my company's environment through a specific IP address through a VPN connection. But the problem is that I am stationed outside of my company, (meaning that I have a desktop in an outside environment) and there is an IP conflict for the NAS that I am trying to reach for mapping my drives. Currently I am not authorised to change the IP address of the current environment that I am in.
But I suppose NAT can be the solution that I am looking for? To translate out the ipaddress of the NAS to another IP address as it leaves the environment?
How you do this if you are running your FortiGate in multi vdom mode?
Just create a pool of ip-addresses or an address and assign that pool itself to policy-itself ?
NAT type is set at the individual VDOM level
@@FortinetGuru It is obvious each nat is belong to respective vdom.
Normally policy itself gives you an option to nat to outgoing interface, but you would select a pool instead.
But my question is in multi vdom mode, Just create a pool of ip-addresses or an address and assign that pool itself to policy-itself, is that right?
Has anyone used VIP with DDNS? The VIP seems to require placing a static IP?
You can enter the external IP as 0.0.0.0 and select an interface to catch any (dynamic) IP on that interface.
@@vewo234 thanks support got back with me with the same info
Sir we currently using firmware 6.4 . Now firmware 6.4.1 is available. shall we upgrade this? Is their any bug?
Check the release notes and see if any of the known issues would impact you or if any of the resolved issues will fix problems you guys are experiencing. Then deploy on a test lab that mirrors your environment to see if it impacts your organization. Safest way to do it.
@@FortinetGuruSir Thank you so much
hi @Fortinet_Guru i need some help. How can you do this? My boss needed me to do this.
"I need you to NAT your local address to 10.188.10.0/24 before it crosses the tunnel"
How is your firewall setup? Central NAT or standard?
@@FortinetGuru Just standard, we're using Fortigate 300E
On your policy from internal network to external ipsec network use IP Pool.
VIP for the other direction.
@@FortinetGuru Thank you, will try this
First.
liar
the comment certainly fits the avatar and name
@@FortinetGuru liar