Cisco Routers, NAT and DNS...

[Ronald Rivera]

Hi Michael,

I am also using NAT on my network and all was quite well. 

Here's a snip of my router config file:

<start>

interface e0/0
ip nat outside

interface e0/1
ip nat outside

interface e0/3
ip address 1.2.3.4 255.255.255.0 ---> public ip
ip address 192.168.0.1 255.255.255.0 secondary ---> private 
ip nat inside

interface s0/0
ip nat outside

ip nat inside source list 2 interface Ethernet0/3 overload

access-list 2 permit 192.168.0.0 0.0.0.255
access-list 2 deny any

<end>


I presume this is the kind of setup that you have. Whenever I do a dns query, the packet comes back from the source since the router knows where it originated and was translated back to its original address.

Of course this scenario was only specific to my setup. Please let me know if you have a different setup.

Hope this helps,

Ronald


On Fri, 22 Jun 2001, Pelletier, Michael wrote:

> 
> I have recently discovered that the Cisco routers, when natting, will mess
> with a DNS query, coming inside to my DNS server. Has anyone else
> experienced this? Does anyone else know of a fix?
> 
> 
> 	Thanks,
>