Autoconfiguring level 2 visibility between subnets in a shared network?

Simon Hobson dhcp1 at
Thu Jul 27 18:39:20 UTC 2006

Gonzalo HIGUERA DÍAZ wrote:

>I was wondering the following: given that a shared-network statement
>group subnets that share a broadcast domain (or am I wrong here?),
>wouldn't it be useful if a lease obtained for a host in one of those
>subnets carried would include information about the rest of the
>link-local subnets? In this way, a DHCP-enabled host in
> would be able to talk at level 2 to hosts in
> (asuming both subnets were defined in a shared-network
>and really had level 2 visibility). Am I foolish for wanting such an
>option, is the DHCP protocol or its implementations the limiting
>factor, or have I just not been looking well enough?

It would require an option to configure client 
routing which isn't standard and none of the 
commercial dhcp clients request or support that 
beyond 'default router'. With an open client you 
should be able to do something with a custom 
option, that's typically only going to cover some 
of your clients.


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