DHCP on VLAN

Tim Peiffer peiffer at umn.edu
Sat Feb 24 17:07:31 UTC 2007


This is really a question for either Ted or ISC.  When I was 
experimenting, I created my 30 vlans and I ended up patching a few 
things to make it work.  Since then, I have had a number of 'upgrades' 
to change out to GigE hardare, and reimplement DHCPD to account for the 
current code and the limit on VLAN's hasn't shown up since.  I remember 
there was an error message shortly after startup that indicated that 
there wasn't any room left on the stack for numbers of interfaces.

I would think that one limiting part of any multi-homed environment is 
the amount of non-unicast traffic that the server sees.  Every broadcast 
packet creates an interrupt and has to be inspected.

Ted or ISC - do you know of any current limits on the number of 
interfaces used for dhcpd?

Tim Peiffer
Networking and Telecommunications Services
University of Minnesota

> Secondary question of my own ...
>
> I've just set up a Debian Etch box doing VLAN trunking to a switch 
> (for a multi-tennant gateway). DHCP appears to work fine on all the 
> virtual interfaces, are there any 'gotchas' I should be aware of ?
>   



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