[c-nsp] DNS forwarding/proxy

[Oliver Boehmer (oboehmer)]

Check out "Split DNS" feature (very new, 12.4(9)T,
http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a0
0806bd780.html), which could do what you need, but likely not on your
platform :-|

What are yoy trying to achieve?

	oli

Florian Prester <mailto:Florian.Prester at rrze.uni-erlangen.de> wrote on
Tuesday, July 18, 2006 12:19 PM:

> Thanks for your answer, even if it does not sound very good :-(.
> 
> Is it possible to redirect some traffic by using ACLs?
> I think I have read something about doing so, but cannot remember
> where and on what system.
> 
> Thank you
> Florian Prester
> 
> 
> Oliver Boehmer (oboehmer) wrote:
>> 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
>>>>>> 
>>>>>> 
> 
> 
> --
> Dipl. Inf. Florian Prester
> Network Administration
> Regionales RechenZentrum Erlangen
> Universitaet Erlangen-Nuernberg
> Martensstr. 1
> 91052 Erlangen
> Germany
> 
> Tel.: +499131 8527813