Getting real close now. I changed the IP addresses so that - On the Linux PC, the Linksys PCMCIA card Model No. PCM100H1 has an IP address of 172.16.0.1 ( instead of 10.20.0.1 ) - the Win 98 PC that Iím trying to ping has a Diamond Mulmedia Eth / HPNA card, I set the IP address there to 172.16.0.3 The Ethernet connection works, both PCs can ping each other. The HPNA connection does not work. I unplug the Eth cable from both PCs and plug in the HPNA phone line (straight thru phone line). When I try the pings with HPNA I get the destination host unreachable message. Note: The HPNA connection on the Win 98 machine does work with another Win 98 machine. Does the Linksys PCM100H1 card need to be, or can it be, configured to auto-select the interface ? Or can it be set to be HPNA only ? From Linux ? From reading the Linksys documentation, I had thought and hoped that the interface would auto-select.