3 x NW65 servers (same IP segment), 1 of them is a BM38sp2a

I'm setting up filters using filtcfg... I've setup a ping-st filter so
that I can ping all servers outside.

One of the NW65 servers is a DHCP server. Workstations received their
IPs from it.

Strange thing: All workstations can ping the servers outside... but not
two of the NW servers, including the BM servers.

This is how I set up the ICMP filter:

Src Interface: Private
Dest Interface: Public

Packet Type: ping-st Protocol: ICMP

Src Addr Type: Network
Src IP Addr: X.Y.0.0/255.255.0.0
Dest Addr Type: Any address