[c-nsp] dns resolution not working with vrfs

[Phil Mayers]

luismi wrote:
> Hi all,
> 
> I tried this code:
> ip domain-lookup source-interface Port-channel1.92
> ip name-server vrf FW2INET 199.45.32.40
> ip name-server vrf FW2INET 151.202.0.85
> ip name-server vrf FW2INET 151.202.0.84
> 
> And the test is...
> #ping www.google.es
> Translating "www.google.es"...domain server (255.255.255.255)
> % Unrecognized host or address, or protocol not running.

What happens if you do:

ping vrf FW2INET www.google.es

...here?

> 
> Then I tried...
> no ip name-server vrf FW2INET 199.45.32.40
> no ip name-server vrf FW2INET 151.202.0.85
> no ip name-server vrf FW2INET 151.202.0.84
> ip name-server 199.45.32.40
> ip name-server 151.202.0.85
> ip name-server 151.202.0.8

...this won't work because the source-interface is in a VRF, and there 
isn't a per-VRF "ip domain-lookup source-interface" command

We saw something related to this the other day; I'm half convinced that 
per-VRF DNS settings are only used "inside" that VRF e.g. for "ping vrf" 
versus plain "ping" commands.