Cups with more than one network?

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
& public net, 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 natively. 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? I'd like not to add printers manually, since ipp does this for me.
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