Very simple LAN - Help!

[Dat]

Can anyone explain this?

Setting up a very simple LAN.

3 machines:

#1 win2k pro
#2 win2k pro
#3 win98 se

all connected via 5 port linksys workgroup hub

machine 1 can ping machine 2 and 3
machine 2 can ping machine 3
machine 3 can ping machine 2

machine 2 & 3 can NOT ping machine 1

any ideas? I installed some firewall software which i later disabled, could it be that the software set some key in the registry that causes machine 1 to not reply to pings?

 

[obenton]

If # 1 is connecting to the internet, it's likely the private IP address is being changed to the internet IP address.

 

[Dat]

Well I do have another nic in machine #1 to connect to cable modem but the ip address of the one connected to the lan does not change.

 

[obenton]

Yes, could be the firewall remnants. Some programs are quite rude and don't properly restore the registry when you uninstall them.

 

[PCPilgrim]

For whatever reason machine#1 is either redirecting the ICMP echo response out toward the internet or it is trashing it. I was seeing something similar in my setup until I got my host/domain entry correct in the TCP/IP stack bound to both NICs. They should not be the same.

HTHs,

PCPilgrim