There were problems in the past with the sky2 driver and it still seems to act up once in a while. to replace it and to have sure the new card is detected as eth0 i did the following afterwards since it was running fine the first two weeks or so.
i disabled the first LAN card in the bios. removed the rule set (could have simply changed it as well, as i had to any way because the firewire popped up as eth1)
rm /etc/udev/rules.d/z25_persistent-net.rules
after a reboot it was automatically regenerated
# This file was automatically generated by the /lib/udev/write_net_rules
# program, probably run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line.
# MAC addresses must be written in lowercase.# PCI device 0×8086:0x100c (e1000)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:02:b3:91:64:d0″, NAME=”eth0″# Firewire device 0011d800016be1a3 (ohci1394)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:11:d8:00:01:6b:e1:a3″, NAME=”eth2″# PCI device 0x11ab:0×4364 (sky2)
SUBSYSTEM==”net”, DRIVERS==”?*”, ATTRS{address}==”00:1d:60:33:1b:dc”, NAME=”eth1″
nano /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).# The loopback network interface
auto lo
iface lo inet loopback# The primary network interface
auto eth0
iface eth0 inet static
hwaddress ether 00:02:b3:91:64:d0
address 212.123.252.242
netmask 255.255.255.0
network 212.123.252.0
broadcast 212.123.252.255
gateway 212.123.252.1
# dns-* options are implemented by the resolvconf package, if installed
dns-nameservers 192.168.0.1
dns-search cipar.netauto eth1
iface eth1 inet static
hwaddress ether 00:1D:60:33:1B:DC
address 192.168.0.1
netmask 255.255.255.0
broadcast 192.168.0.255
network 192.168.0.0auto dummy0
iface dummy0 inet static
address 192.168.1.1
netmask 255.255.255.0