Hi,
hopefully funny one:
VMware Workstation 5.5 on XP SP2,
two guests W2K3 Enterprise, SP2
Network was setup as "Host only", DHCP and NAT disabled.
Host: 10.1.1.1
VM1: 10.1.1.10 (DC)
VM2: 10.1.1.11
Everything netmask 255.255.255.0
Connections between guests are fine: ping, shares, join...