FreeBSD ip alias ( multiple IPs )

#vi /etc/rc.conf

Add below

ifconfig_bge0_alias0="inet your_2nd_ip netmask 255.255.255.0"

ifconfig_bge0_alias1="inet your_3rd_ip netmask 255.255.255.0"

ifconfig_bge0_alias2="inet your_4th_ip netmask 255.255.255.0"

.

.

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#/etc/rc.d/netif restart

#/etc/rc.d/routing restart