Jun

12

How to add multiple IP to a single NIC in FreeBSD

Filed Under Networking 

FreeBSD allows you creat alias or assign multiple ip address to single NIC (network interface card)

My setup:
fxp0 - IP : 192.168.1.1/255.255.255.0
fxp0 alias - IP : 192.168.1.5/255.255.255.255

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

A) From command line use ifconfig command as follows:
# ifconfig fxp0 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_fxp0_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 fxp0
lnc0: flags=8843 mtu 1500
inet6 fe80::20c:29ff:fe01:ddbd%lnc0 prefixlen 64 scopeid 0×1
inet 192.168.1.2 netmask 0xffffff00 broadcast 192.168.1.255
inet 192.168.1.5 netmask 0xffff

Read ifconfig man page.

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