Serving two subnets on same VLAN
Simon Hobson
dhcp1 at thehobsons.co.uk
Sun Sep 25 07:37:35 UTC 2011
Norman Elton wrote:
>Assume that a router is configured with three interfaces:
>
>10.0.1.1/24 (primary interface)
>192.168.1.1/24 (secondary interface)
>192.168.2.1/24 (secondary interface)
>
>The router is configured to be a DHCP relay; however, only sends
>requests from its primary interface (10.0.1.1).
Norman Elton wrote:
> > That's what the shared-network statement is used for:
>
>Interesting, I always thought the relay would have to send requests
>from the individual subnet, even in a shared-network. I will
>experiment with this.
Can you just clarify that when you say primary and secondary, you are
talking about the same physical port/VLAN on the router ?
Assuming yes, then shared-network is what you need and it "just
works". If you think about it, the router cannot use the different
subnet addresses because it has no knowledge of which subnet a client
is supposed to be in - if you think about it, how can it ?
If you want specific clients to use a particular subnet, then you
will need to use classing or host entries with fixed addresses to do
so. The server will not automatically assign clients to a specific
subnet - it just treats all available addresses as equal.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
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