[c-nsp] DNS forwarding/proxy

[Florian Prester]

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