Silly config or bug?

David Farmer farmer at
Fri Apr 24 14:08:31 UTC 2009

That is incorrect, you must use the "shared network" config option to tell 
the DHCP server which subnets are on the same subnet. 

We have hundreds of, maybe even a thousand, VLANs set up this way

On Apr 24 2009, A.L.M.Buxey at wrote:

>if I recall correctly, you cannot operate DHCP on a
>secondary interface range on cisco kit with ip helper
>ie the DHCP server must have a leg on that VLAN and be listening
>for that range if you want to do it.
>yet another reason to avoid a secondary interface on a VLAN
>(unless its only for static hosts I guess) - they are widely
>condemned s being bad things (tm) - only useful in migration
>states (eg moving static hosts from a public IP range to a private
>range so they can still be routed without messing with VLANs
>at switch-level)
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