Simon, Here's the simple answer,
To add it
# ifconfig eth0:2 192.168.1.111 up
To drop it
# ifconfig eth0:2 down
To find out more about it
# man ifconfig
If you are using an address range that is normally a "B" as a "C" for
example
# ifconfig eth0:2 172.16.1.111 up
then you will need to do
# ifconfig eth0:2 netmask 255.255.255.0
# ifconfig eth0:2 broadcast 172.16.1.255
HTH
Pete
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