you should not have to assign IRQ's for your Network Interface Card (NIC) in most cases (unless you have not disabled PNP in your bios). Linux will display all the IRQ information you will likely need if you sign in as root, open a terminal, and type:
cat /proc/interrupts
for all the information you will likely need about your two realtek NIC's
type:
ifconfig -a (to display all network connections whether up or down)
and
lspci -v (lspci is a utility for displaying information about all PCI buses in the system and all devices connected to them; the -v tells lspci to display more detailed information about all devices.
if you need help configuring your NIC's, try
http://www.linuxheadquarters.com/how...rkconfig.shtml