GNS3-Topology: ACL Test Lab for ACLs and NAT/PAT
Written by LBSources from http://www.gns3-labs.com on October 15th, 2009 | 14 Comments“Hello World!’ – Hey so it’s been while since posting last and some things are getting back to normal since the move. One of them is my office 
Very happy about that! One thing that has not gotten back to normal is routine studying – I’m so far behind from my goal – but I do have 2 months before the year is out to complete the BSCI – Don’t know if I can do it though. I’m just not in the zone. Well anyway, here is a lab I’ve been meaning to put together to share with you all. It’s a lab involving NAT/PAT and Overload .. Sean shares this with us.
I setup this lab up to help me better understand ACLs (Standard, Extended, Dynamic, and Reflexive) and NAT’ing (e.g. Overload, Dynamic, and Static).
The IOS used is a 3640 version 12.4. The special topic about this lab is I did this on a Mac Book Pro and used the TAP/TUN drivers to attach my MBP into the simulation. So this config requires that GNS3 be run as root (e.g. sudo) in order to allow the TAP device to be created. Information on the TAP/TUN drivers for OS X can be found here:
Sean
Thanks for the lab dude! You too can share labs – You can either create a post here on the site with your lab and send all files necessary to the lab to postmy AT gns3-labs.com. You can also skip posting it and just send all files necessary to the lab to postmy AT gns3-labs.com. Thanks to all the help from contributors like Sean – you call help keep this site going!
Routers Used: 3640
IOS: c3640-ik9o3s-mz.124-25b
Feature of Topology: Static NAT, Dynamic NAT, Overload NAT, Network Address Translation (NAT), Port Address Translation (PAT), Access Control Lists
Image: 
Download: GNS3-Labs-ACL Test Lab for ACLs and NAT-PAT By Sean
Cheers!
LB
23,455 viewsTags: 3640, Access Control List, Dynamic NAT, GNS3 Topology, Network Address Translation, Overload NAT, PAT, Port Address Translation, Static NAT
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October 16th, 2009 at 5:04 am
hello,
could you please share a simple tpology (4 routers max) where nat overload is implemented and working. I have tried it on several router platforms, it just doesn’t work.
exemple:
R1——R2——-R3——–R4
nat is implemented on R2
eigrp is emplemented on R3,R2,R4 and the network linking R1 and R2 is not advertised. default route on R1 (pointing towards R1)and R2 (pointing towards R3)
when I try to ping R3 from R1: nothing
when I use an extended ping from R2 with ping source as the interface facing R1, the access-list is hit, ping to R4 is successful ,and i can see nat translations and statistics.
I am not asking how to configure NAT, the question is: is nat supported on GNS3. static NAT works fine
November 2nd, 2009 at 6:48 am
Good Post! Have you also tested ASA on Qemu particularly latest code v8.2 ?
March 15th, 2010 at 10:55 am
Will this ACL / NAT work on GNS3 on windows?
March 16th, 2010 at 7:16 pm
NAT Overload is working fine on GNS3. I justed tested your topology using 2961 models.
R2#sh ip nat translations
Pro Inside global Inside local Outside local Outside global
icmp 192.168.0.2:1 10.0.0.2:1 172.16.0.1:1 172.16.0.1:1
icmp 192.168.0.2:5 10.0.1.2:5 172.16.0.1:5 172.16.0.1:5
R2#
I even added an Loopback int on R1 to be sure (that’s the 172.16.0.1).
So my setup is:
R1 Lo0: 172.16.0.1/24
R1 Fa0/0: 192.168.0.1/24
R2 Fa0/0: 192.168.0.2/24 (ip nat outside)
R2 Fa0/1: 10.0.0.1/24 (ip nat inside)
ACL: extended acl_nat permit ip 10.0.0.0 0.0.255.255 any
NAT: ip nat inside source list acl_nat interface fa0/0 overload
R3 Fa0/1: 10.0.0.2/24
R3 Fa0/0: 10.0.1.1/24
R4 Fa0/0: 10.0.1.2/24
Configured EIGRP on R2,R3 and R4 with network 10.0.0.0
R2: ip route 0.0.0.0 0.0.0.0 192.168.0.1
R2: ip default-network 192.168.0.0
Btw … something sounds strange in your description: “default route on R1 (pointing towards R1)and R2 (pointing towards R3)”
Imho your problem is there.
March 16th, 2010 at 7:18 pm
hmm .. forgot to mention …
My message was addressed to zouhair
September 28th, 2010 at 4:27 am
hello dear , if the nat is implemented in the R2 , R3 can’t ping R1 because
R1 is internal – has local inside ip address – so the R1 is invisble for external users , users in the internet network see only the global outside address ( address of interface R2 , nat overload ) , but internal users can ping external users .
R1–eigrp—R2(nat overload with this ip address)—–(R3–’internet’—R4)
before implementing the nat , must be a communication between all routers in the network .
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November 6th, 2011 at 10:38 pm
Thanks for this lab. There are a good mix of challenges that makes it more interesting than a straightforward situation covering just one particular technology. There were however a number of typographical errors that caused me some confusion (mainly addresses entered incorrectly), and some of the instructions could possibly have been a bit clearer. All in all a great contribution though. Many thanks for your time!
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