From: Filyurin, Yan (yan.filyurin@eds.com)
Date: Fri Feb 16 2007 - 19:37:12 ART
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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