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# Searchable Keywords: dual multi net eth0 interface



	Notes on dual homing a ethernet internface

Linux:	This came from the sparclinux list


You want to set an alias. If eth0 is configured and you want to add an 
alias
for 192.168.100.2 netmask 255.255.255.0, you can use

ifconfig eth0:1 192.168.100.2 netmask 255.255.255.0

Files to edit to make the interface come up at boot or reload network

1) edit /etc/sysconfig/network-scripts/ifup-aliases	
	I just put in a "0:1"  # Don't know if this was really neccessary?
2) copied the ifcfg-eth0 to ifcfg-eth0:1
	edited that to reflect the new IP number and left everything
	else the same. Including the DEVICE=eth0 <--- WRONG ! !
	Once I rebooted the machine. It came up with the wrong IP
	YOU MUST CHANGE THE "DEVICE" TO eth0:1
3) made an entry in the /etc/hosts with the name and number of the new
	interface.

I brought up the new interface with /etc/rc.d/init.d/network reload
You may need to stop network services /etc/rc.d/init.d/network stop
and then restart /etc/rc.d/init.d/network start


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Solaris:
	on single network

1) put an entry for the new inerface in /etc/hosts
	example: 192.168.1.9	internal
2) add /etc/hostsname.le0:1 in this file you will put the name of interface 
	example: internal



	crossing networks
This just gets plain complex. You do the steps above then .....
3) add an entry for the new network in the /etc/netmasks
4) you ABSOLULTY sure that rip is not running and will NEVER run
	if data packets cross the switch your the entire network will fail!
5) asign a completely different MAC address to the new interface(Suns only)
	on intel it will take if off the card if a second is installed.