[c-nsp] DNS forwarding/proxy

[Oliver Boehmer (oboehmer)]

There is "ip dns server" (don't think it is available on the Cat4500
software releases, but it is in 12.2T/12.3 and later releases in some
advanced feature sets) which turns a Cisco router into a caching DNS
server, it uses the configured "ip name-sever ...." addresses as
forwarders. 
There is little documentation for this feature (we're working on it),
but next to the "ip dns server", there are also new keywords for the "ip
host ..." command..

	oli

Rodney Dunn (rodunn) <> wrote on Thursday, June 29, 2006 4:06 PM:

> My bad..not enough coffee yet in the morning.
> 
> I thought you meant dhcp.
> 
> I don't know the answer.
> 
> On Thu, Jun 29, 2006 at 04:00:08PM +0200, Florian Prester wrote:
>> Rodney Dunn wrote:
>>> Did you try configuring an "ip helper address x.x.x.x"?
>>> 
>> 
>> I think an ip helper address is only for Broadcast traffic?? Is it
>> not? I want the router to accept unicast dns requests to its own IP
>> and act as an DNS-Server by asking another DNS-Server (or proxying
>> the request to the other sever). 
>> 
>> Greetings
>>  Florian
>>> On Thu, Jun 29, 2006 at 03:11:05PM +0200, Florian Prester wrote:
>>> 
>>>> Hi,
>>>> 
>>>>  is it possible to configure a Catalyst 4500 (SupIV) to act as a
>>>> DNS Proxy? Or at least to tell it to forward incomming
>>>> dns-requests to a specific DNS-Server? 
>>>> 
>>>> 
>>>> Thanks
>>>>   Florian
>>>>