Sunday, March 3, 2019

DNS forwarder through Cisco PAT

I'm having trouble with resolving public DNS in my GNS3 home lab.

The device chain is PC -> IOSvL2 switch -> pfSense FW -> [g0/0] Cisco 7200 router g[1/0] -> Home DSL -> Internet

I have standard PAT set up on the Cisco 7200:

g0/0 ip nat inside

g1/0 ip nat outside

access-list 1 permit any

ip nat inside source list 1 interface g1/0 overload

I can ping 8.8.8.8 from the PC and I can see the traffic being translated on the router.

When I do an nslookup to 8.8.8.8 I don't see any translation. I can see the request in Wireshark pre-router but not post-router.

What do I need to do to get DNS traffic NAT'd like the ICMP traffic?



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