Cups on different networks

[Sensei]

Hi.

I'm trying to set up cups in order to use all the network printers we 
have. The problem is that we moved from one single open network to a 
vpn, so all the workstations reside on the vpn, the printers on the 
public network.

Previously I didn't have to make any setup to cups, since it saw all the 
printers. Now switching the workstations on vpn... no more printers. I 
tried this:

BrowseAddress VPN.IP.NUM.255
BrowseAddress PUB.IP.NUM.255

But nothing, cups won't show me anymore the printers... Can anyone help me?
-- 
Sensei <mailto:senseiwa at tin.it>

The optimist says "Tomorrow is sunday".
The pessimist says "The day after tomorrow's monday". (Gustave Flaubert)