I have a Windows 2003 domain trying to ping hosts in a Windows 2000 domain (2 different forests) My goal is talk to the old domain using non FQDN host names. Do not want WINS. I can ping successfully when using the FQDN. I can also perform an nslookup using the non FQDN host name. I can not ping and client machines in the new domain can not talk to applications servers in the old domain. How do I talk to the old domain using non FQDN host names then? Under Windows 2003 DNS we have configured Conditional Forwarding to the old domain. Also tried adding the old domain as a secondary forward lookup zone. On the Windows 2000 DNS have a delegation record for the new domain. Tried adding the new domain as a secondary zone on the old domain as well. This is a migration that might take a while.