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Strange Ping results - Linux/MS diffrent answers

Relative newbie on Linux, but having strange results with local LAN ping tests, whilst I try and figure out the correct routing commands I have encountered two questions. Why I can ping the server from 2nd local adjacent Linux server, but not from adjacent local MS 2000 server. Network is as follows:
Server A (MS) ip address eth0 xx.xx.64.2
Server B (Linux) ip address eth0 xx.xx.64.5
New C server (Linux) ip address eth0 xx.xx.64.4
Router D ip address xx.xx.64.1
All point to gateway xx.xx.64.1, all /28 mask, all part of same vlan with all devices on same local switch.
I can ping from A to B, A to D
I can ping from B to A, B to C, B to D
I can ping from C to B and C to D but not A
I can ping from D to A, D to B but not C

My question is not really with regard to how to fix the routing issue, but why the difference between MS & Linux, does this mean the TCP/IP stack is different and if so, what other significant differences are known? RARP & ARP? My 2nd question is how to thoroughly test a LAN card under Linux or detect before wasting time on thinking I have a VLAN/routing issue?

Thoughts most welcome.

1 Solution
Have you tried restarting your router? As it is the gateway ip all packets are going to be routed through it. Another thing to try is adding the ips of  A,B & D to /etc/hosts on C.
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