I have three servers:
fs a NW 6.5 sp7
gw a NW 6.5 sp7
gms a Linux Enterprise server.

These are all on the same switch.

I get 100% returns on a ping when:

gw pings fs
fs pings gw
gw pings gms
gms pings gw
gms pings fs

However, I get at least a 10% loss when fs pings gms.

I changed ports on the switch. No difference.

Any ideas why this might be happening?