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Multiple IP Addresses

Sometimes you require having additional IP addresses attached to a network card. On FreeBSD this is quite easily done by adding the aliases into /etc/rc.conf so that on bootup these aliases are attached again to the network card. For example if you have a Intel based networkcard which is em0 in this case we add: ifconfig_em0="inet 192.168.37.2 netmask 255.255.255.0" ifconfig_em0_alias0="inet 192.168.37.3 netmask 255.255.255.255" ifconfig_em0_alias1="inet 192.168.37.4 netmask 255.255.255.255" ifconfig_em0_alias1="inet 192.168.38.2 netmask 255.255.255.0" For aliases in the same ip range one uses 255.255.255.255 as the netmask. It's valid for a different block to add the correct netmask for the first ip in that range.