From: Jian Gu (guxiaojian@gmail.com)
Date: Fri Feb 16 2007 - 20:00:06 ART
This was asked before, there is a interface command which will allow DHCP
packets with option 82 to go through in stead of drop them.
On 2/16/07, Filyurin, Yan <yan.filyurin@eds.com> wrote:
>
> Hello list. I was recently playing around with DHCP snooping
> configuration
> and they way I had it set up was that I had router A and B connected to a
> switch being on the same vlan where A was getting its IP address from B
> through DHCP. So I decided to play with DHCP snooping and enabled it for
> that
> particular vlan. Suddenly DHCP stopped working. After doing a couple of
> debugs, I could see that A was originating the request and B was seeing it
> and
> giving an error, and the only way I could resolve it is by doing:
>
> no ip dhcp snooping information option
> And ip dhcp snooping trust
> After reading RFC that kind of makes sense and of course the second makes
> sense on the router port. The question is. If I had router C (somewhere
> behind router B) set up as a DHCP server and router B would just be a
> relay
> with the helper-address command, would I still need to do this tweak
> because
> it appeared that router B was getting confused by the switch setting
> option
> 82.
>
> Thank you
>
>
>
>
> Yan Filyurin
> EDS - Bank of America, Network Design
> MS: MA6-536-0501
> 1025 Main Street
> Waltham, MA 02451
> Office: +1-781-788-2207
> Cell: +1-617-875-4862
> yan.filyurin@eds.com
>
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