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[ FreeBSD ]

"2 IP adress to single ethernet card" - Ülkü SAYILAN - (2006-05-31 21:32:42)   [4418]

It is possible to create network alias or assign 2 ip address to single NIC under FreeBSD.

My setup:
lnc0 - IP : 192.168.1.1/255.255.255.0
lnc0 alias - IP : 192.168.1.5/255.255.255.255

Note: Netmask must be different otherwise you will get an error ifconfig: ioctl (SIOCAIFADDR): File exists

A) From command line use ifconfig command as follows:
# ifconfig lnc0 192.168.1.5 netmask 255.255.255.255 alias

B) You can setup this alias in /etc/rc.conf file by appending following text, so that next time FreeBSD comes up (after restart/shutdown) it will create alias for you:
ifconfig_lnc0_alias0="192.168.1.5 netmask 255.255.255.255"

C)Restart FreeBSD network service using following script:
# /etc/netstart

D) Display alias and real ip using ifconfig lnc0 command:
# ifconfig lnc0
lnc0: flags=8843 mtu 1500
inet6 fe80::20c:29ff:fe01:ddbd%lnc0 prefixlen 64 scopeid 0x1
inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
inet 192.168.1.5 netmask 0xffff


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