I have two different sites connected via an IPSec LAN to LAN VPN. I am able to browse shares, printers, terminal services etc but only by IP and FQDN. At each site there is a dns server and that resolves names for the internet and LAN resources local to each site. the DNS set up has forwarders pointing to each office DNS server, and I have added secondary zones which are copies of the others primary zones, but still I can only ping by FQDN. eg ping server1 timesout, ping server1.domain.com gets a reply.
I have trawled through other solutions all day, if there is a solution out there I can't see it and I am sure it's not too big a problem to someone!