DHCP and multiple VLANs

[santi at usansolo.net]

Dear Srs,

I'm trying to setup a dhcpd3 server in a network with near about 20 vlans,
using v3.0.1-2 in a Debian Sarge box.

I setup all vlans in Linux using vconfig, and using tcpdump I can see all
DHCPDISCOVER requests without problems from all VLANs, network config is
working OK (all vlan interfaces has eth0 as raw device).

There are near about 20 vlans and I'm *not giving IP address to those vlan
interfaces*, example:

(..)
auto vlan101
iface vlan101 inet static
        address 0.0.0.0
        netmask 0.0.0.0
        vlan_raw_device eth0

auto vlan102
iface vlan102 inet static
        address 0.0.0.0
        netmask 0.0.0.0
        vlan_raw_device eth0
(..)

I start dhcpd3 listening on all interfaces, and I can't see DHCP request in
the logs.. but I can see requests without problems using tcpdump :-/

If I setup a IP for each vlanXXX interface dhcpd3 works OK; but, there's no
way to prevent giving one IP to each vlan interface in the Linux box?

I have tried giving a dummy IP (127.0.0.2/255.0.0.0) for the vlan
interfaces.. but I get:

Oct 13 13:13:13 pxe dhcpd: DHCPDISCOVER from 00:19:b9:XX:XX:XX via
vlan3539: network 127.0/8: no free leases

What's the best method to deal with DHCP and multiple VLAN, perhaps I must
assing a IP foreach vlanXXX? Thanks!

Regards,

--
Santi Saez
http://woop.es