Re: DHCP serving more than one subnet (longish)
From: Graham Burley (burley.not-this_at_encompasserve-or-this.org)
Date: 10/25/03
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Date: Sat, 25 Oct 2003 00:00:18 +0000 (UTC)
JF Mezei wrote:
>
>
> Nop. DHCP requests cannot be passed by a ROUTER. You need a relay server
> (which I assume can be integrated into a router, but it isn't part of the
> basic role of a router).
>
BOOTP and DHCP relaying is normally performed by routers.
>
> It doesn't directly tell it what subnet it is coming from. For instance,
> consider a router that have 4 interfaces. The IP address in the giaddr would
> be the IP address of the interface talking to the DHCP server and the DHCP
> server would then not know which of the other 3 subnets the client request
> originated from. (I think that this is where those relay server options come in)
>
The giaddr is the address of the first relayer. In the case of a router
with multiple interfaces it will be the address of the interface that
received the request. The giaddr is preserved as the packet passes
across routers so that a BOOTP or DHCP server can configure clients
that are multiple hops away.
Graham
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