DHCPINFORM

[Marty Sørensen]

Hey Glenn,

What if you have some L2 device (where the client is connected), not the L3
relay, that does DHCP snooping and add's option-82 in the packege for
validating the DHCP request, this is then dropped by the switch because the
server strip's the option-82 :-(

Martin

On Wed, Feb 4, 2009 at 2:02 PM, Glenn Satchell
<Glenn.Satchell at uniq.com.au>wrote:

>
> >Date: Wed, 4 Feb 2009 13:44:36 +0100
> >Subject: Re: DHCPINFORM
> >From: Marty Sørensen <buzzwork at gmail.com>
> >To: Users of ISC DHCP <dhcp-users at lists.isc.org>
> >X-BeenThere: dhcp-users at lists.isc.org
> >
> > Hey Randall,
> >
> > Thanks for the reply. It seens that the switch relay's the option-82 OK,
> in
> > this case, but the server drops it ?
> >
> > Martin
> >
> DHCPINFORM is unicast to the dhcp server, so the switch's relay never
> sees it. Relays only see broadcast packets, then add the option-82 and
> forward tot he dhcp server.
>
> See the posts earlier today about how responses to DHCPINFORM don't
> look at existing lease data. This includes any options added by the
> relay when it processed the DHCPDISCOVER.
>
> regards,
> -glenn
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20090204/ff9e8160/attachment.html>