Debian's:

# 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
allow-hotplug eth0
iface eth0 inet static
address 10.90.5.2
netmask 255.255.255.0
gateway 10.90.5.1

auto eth0

iface eth4 inet static
address 10.90.5.2
netmask 255.255.255.0
gateway 10.90.5.1

auto eth4

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Ubuntu Hoary Live's:

# 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

# This is a list of hotpluggable network interfaces.
# They will be activated automatically by the hotplug subsystem.
mapping hotplug
        script grep
        map eth1

# The primary network interface
iface eth1 inet dhcp