I have two identical Intel Core 2 Duo boxes. One is Fedora Core 6, uname -r shows 2.6.18-1.2798.fc6xen. The other box has Fedora Core 8 and uname -r says 184.108.40.206-42.fc8 (I wonder why there is no 'xen' ending? I downloaded x86_64 ISO DVD image, the same about FC6)
Both has identical configuration. The FC 6 is perfect, no issues. At FC 8 adding to /etc/rc.local
vconfig add eth0 3
makes the box to lose 30-50% pings at eth0 (the other machine pings FC8).
Interestingly pinging eth0.3 address gives 0% lost frames.
What happened to FC8 it stopped working?