Client classing

[Glenn Satchell]

>From: Morten Andersen <morten at vianett.no>
>To: "dhcp-users at isc.org" <dhcp-users at isc.org>
>Date: Fri, 22 Jun 2007 17:19:55 +0200
>
>Hi
>I am trying to create two address pools with a different gateway. I have found 
that client classing is exactly what I need but I can`t figure out what option I 
should use as a filter.
>
>Here are the two example requests:
>dhcpd: DHCPREQUEST for 10.0.51.240 from 00:0b:cd:04:d3:2f (NAT) via 10.0.51.253
>dhcpd: DHCPREQUEST for 10.0.51.240 from 00:0b:cd:04:d3:2f (NAT) via 10.0.51.254
>
>I want to filter on the relaying address. One gateway for requests via 
10.0.51.253 and another for requests via 10.0.51.254. Is this possible?
>
>Best regards,
>Morten Andersen
>
>
Failing any specific option you could always extract that piece of
information from the packet directly. The function packet() is
described in the dhcp-options man page.

     packet (offset, length)

       The packet operator returns the specified portion  of  the
       packet  being  considered,  or  null  in contexts where no
       packet  is  being  considered.    Offset  and  length  are
       applied  to the contents packet as in the substring opera-
       tor.

regards,
-glenn