A couple of weeks ago, a got another old laptop with 3com network card. I decided to install Fedora Core 3 on it, so I could check out Apache 2.0, php, mysql etc. But it act up really weird.
I have another machine with Fedora Core 1 on it, which I managed to install Apache 1.3, Oracle, SSHD, e-mail server some years ago. I don't remember if I did anything special back then, but it still works perfectly (except SSHD don't start up properly anymore, I have to type "SERVICE SSHD RESTART" manually each time I boot it up to make SSHD start properly).
But the Fedora 3 machine is weird. The internet works fine, yum works fine, Apache 2.0 works fine when I type 192.168.1.101 (the machine IP) in firefox on the Fedora 3 machine.
But it seems it has trouble communicating with the rest of the machines. If I type "ping 192.168.1.101" from my XP or Fedora 1 machine, it fails. If I type 192.168.1.101 in Fedora 1 or XP browser, it fails. When I look in the ARP tables in my router, only the Fedora 1 and XP machine shows (and my ISP) (well, sometimes, for example, close to reboot it shows, then after a while it disepears).
And no I am getting clueless.

Is it something wrong with the network card? Is it the router that won't talk to the 3com card? Or is it this new thing, SELinux (I guess it stands for Secure Linux or something) that prevents me from communicating with my Fedora 3... And why does internet still works, when my router can't see the machine... Do I have to turn UPnP back on?
I am starting getting supspisios of the SELinux thing under the gnome / redhat network setup box. It was not in Fedora Core 1. Otherwise the Fedora Core 3 machine is set up identically to the Fedora 1 machine (different IP of course). But I should be able to ping the machine even though it has a SELinux thing installed, shouldn't I?). And my router should have the machine in the ARP table. Will SELinux prevent me from pinging?
Anyone that can help?
