dhcp relay questions..
dhcp1 at thehobsons.co.uk
Tue Jul 18 07:07:23 UTC 2006
>1) For DHCP relay - where do I find documentation,
>how to configure, debug etc. (from developer point
>of view) ?
Starting point would be "man dhrelay"
>2) Does dhcp relay maintain state of each request/
>response between server and client ? If so, is there
>tool to dump dhcp relay database ?
No, DHCP Relay is a stateless function.
>3) Is relay a independent daemon ? Any dependency on
>server code or runtime ?
It's a standalone package, it does not even have to be run on a
routing machine. It also is not dependant on having a particular
vendors DHCP Server.
>4) what are steps to run dhcp relay ?
Check the man page.
From memory (of reading this list, I don't use dhrelay myself), you
would want (where 220.127.116.11 is the dhcp server) :
dhrelay -i eth0 -i eth1 1234
to use only specific interfaces.
A quirk of the way implementation was done is that you must tell the
relay to listen not only on the client facing interface, but also on
the interface that replies from the server will come from. If you are
running the relay on some machine on the clients subnet (not a
router) then these are both the same interface, but if the machine is
also the router they will be different. Also related to this quirk is
that the connection towards the server cannot be a PPP interface.
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