Relay agents, NAT, and offers to giaddr
dhcp1 at thehobsons.co.uk
Fri Sep 15 21:58:53 UTC 2006
Alan DeKok wrote:
> > It doesn't deal with the client renewing though. That would need
>> significant rewriting of the server to handle renewal requests that
>> come from a different IP address to the lease being renewed. IFF you
>> think you can write a workable method for dealing with it, then the
>> way to address it is through the standards bodies - good luck !
> Maybe I'm crazy, but my tests with ISC & a hacked-up test client
>indicate that so long as giaddr is set, that's where the reply goes.
>I've successfully had it renew leases for IP address X that were unicast
>from IP Y (i.e. giaddr).
Clients renewing do not use a relay agent - they unicast directly to
So now you have to capture and mangle unicast packets as well as
broadcast - yet another special case ALG.
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