From: Filyurin, Yan (yan.filyurin@eds.com)
Date: Fri Feb 16 2007 - 20:40:34 ART
So I would have to do the same thing if router B would be a relay agent
as opposed to being a DHCP server?
_____
From: Narbik Kocharians [mailto:narbikk@gmail.com]
Sent: Friday, February 16, 2007 6:28 PM
To: Jian Gu
Cc: Filyurin, Yan; ccielab@groupstudy.com
Subject: Re: DHCP snooping setup
The trust command
On 2/16/07, Jian Gu <guxiaojian@gmail.com> wrote:
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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