dhcp with two relay agents
Simon Hobson
dhcp1 at thehobsons.co.uk
Thu Oct 30 14:07:13 UTC 2008
fadey wrote:
>Thanks. It starts getting more clear. Basically now my question narrows
>down to following:
>
>I have this setup:
>
>shared-network router1 {
> subnet router1.cable_modems {deny unknown-clients; ...}
> subnet router1.emtas {deny unknown-clients; ...}
> subnet router1.hosts1 {...}
> subnet router1.hosts2 {...}
>}
>
>shared-network router2 {
> subnet router2.cable_modems {deny unknown-clients; ...}
> subnet router2.emtas {deny unknown-clients; ...}
> subnet router2.hosts1 {...}
>}
>
>All router1 subnets share the same physical network. The same is true
>for router2 subnets.
>
>Now there is a DHCPDISCOVER relayed from router2 with GIADDR set to
>router2.cable_modems IP. It is an unknown-client (mac is not explicitly
>specified in dhcpd.conf). In this case will dhcpd be "smart enough" to
>DHCPOFFER an IP from route2.hosts1 subnet and NOT from router1.hosts*
>subnets?
Yes, this differentiation based on GIAddr is automagic.
However, and this is something that I hope some of the cable modem
guys will chip with ...
I'm not sure you need the shared network at all. It could be that the
cable equipment is capable of differentiating between the
infrastructure kit, user end cable modems, and user kit - in which
case I suspect the GIAddr received will be set to that of the
appropriate interface.
Either that, or yu keep the shared network and can use something like
vendor class to split the equipment into the appropriate subnets.
I've only vaguely followed the cable modem threads, so hopefully
someone who's actually used this stuff can chirp up and fill in the
blanks.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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