[c-nsp] dhcp problems with ip phones

[Roger Wiklund]

I doubt its a bug, but you can check the bugtool.

Are these two Siemens IP-Phones running some other newer/older
software? Do they have a fallback mode if they dont get an IP via DHCP
they default to and IP, that just happens to be same range that you
are providing? Have you tried factory reset on them etc?

Regards
Roger

On Wed, Oct 6, 2010 at 7:12 PM, Arne Larsen / Region Nordjylland
<arla at rn.dk> wrote:
> Hi All.
>
> I know this might be a bit of topic, but anyhow
> I have dhcp problems with Siemens IP-phone endpoints under Cisco ws-c3750.
> It's quite odd, the problem only happens between two Siemens phones.
> Sometimes when an en endpoint tries to get an ip address via dhcp, an other answer on behalf.
> The flow is like this.
> Endpoint send an discover, the server sends an offer via the relay agent.
> The endpoint sends an request and the server ack's.
> After this the endpoint sends an gratuitous arp on the requested address, and then an other answers that it has the ip address.
> I've pulled out the arp table before enabling a new endpoint to get the ip address list on the switch.
> But after the decline I can't find the mac address in the arp table that I pull out before activating the new endpoint.
> If I use a laptop or an other vendors ip phone I don't se the problem
> Does anyone know off a similar problem, is there a known bug on Cisco ws-c3750 with software release 12.2(25r)SEE3.
> I know that everyone will point towards the Siemens phones, and I'm doing that myself but I just what to be sure that I haven't missed something.
>
> /Arne
>
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