I think this is probably a pretty straightforward problem, but I've failed to get it:
I have domains sam and smc separated by a cisco 2621. smc has some resources that sam must use. I've added helper-addresses for the broadcast channel and the pdc of the other side to each of my ports. I've enabled directed-broadcast and added forward-protocol for the udp 137/138 that pass NetBIOS. However, I still get the "unable to locate domain controller" when I set up the trust relationship. Any ideas?