WRT54GC - problems with eMac on network

I just got the WRT54GC router, and I'm using several computers on my home network:
router - 192.168.1.1
eMac - static IP - 192.168.1.7 - wired
WinXP 1 - DHCP - 192.168.1.102 - wired
WinXP 2 - DHCP - 192.168.1.103 - wireless
Win2k 1 - static IP - 192.168.1.4 - wireless
Win2k 2 - DHCP - 192.168.1.105 - wireless
The problem I'm having is with the eMac. It can ping the router, it can ping the WinXP 1 wired machine, but it can't ping any of the wireless machines. Likewise, none of the wireless machines can ping the eMac. However, if I load up iTunes on a wireless machine, it can see that there is a music share available, but it gets an error when it tries connecting to the share. I can access the eMac's music share from the WinXP1 wired machine, no problem.
I've tried pinging machines from the router, as well, and the router can ping every machine on the network without a problem.
So it seems to me like something is blocking the access between the eMac and all the wireless machines on the network. The WinXP 1 wired machine can access all the wireless machines, it's just the eMac that's having the problem. I've made sure the OSX Tiger firewall is turned off.
The firmware version on this router is 1.02.5.
Any ideas?

Try swapping the cables around.
Try switching the ports each computer is plugged into.
If the Mac is plugged into port 1 on the router, make sure DMZ is turned off.
Pan
I am not responsible or liable for any problems my suggestions may cause. Use at your own risk.

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WRT54GC - problems with eMac on network

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