My router can connect to the internet but computers that connect to the router can't.

I have a Wrt54g version 3.0 connected to a Speedstream modem.  I also have one wired computer connected to my wrt54g and one wireless laptop.  Both my computers can connect to the the router's web interface.  When I go to the status tab, the router is able to get a public IP address and under the diagnostics tab I'm able to ping and tracert to www.yahoo.com just fine.  But the computers that connect to the wrt54g cannot connect to the public internet.  It is really strange.  The computers get an IP from DHCP and I'm able to ping the internal gateway but I cannot ping a public IP address from the computers.  I've got the latest firmware and have tried to restore to factory default without any sucesss?  Any suggestions anyone?

Check the Setup - Advanced Routing page. What you see sounds like you run in "Router Mode" or "NAT disabled". Change to "Gateway Mode" or enable NAT.

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