FreeBSD uses only 1 configuration file to list your IP addresses and default gateway:
/etc/rc.conf
There is one line per IP address in this file. Secondary (alias) IP addresses are configured with a netmask of 255.255.255.255. Here's an example of the lines you will need to have in /etc/rc.conf for 3 IP addresses:
ifconfig_fxp0="inet 10.10.10.10 netmask 255.255.255.0"
ifconfig_fxp0_alias0="10.10.10.11 netmask 255.255.255.255O
ifconfig_fxp0_alias1="10.10.10.12 netmask 255.255.255.255O
Restarting network to re-read IP address configuration file:
/etc/netstart
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