Multiple IP with one nic

[Christopher K. Johnson]

Mike McGrath wrote:

>>
>>-----Original Message-----
>>From: fedora-list-bounces at redhat.com on behalf of Jonathan Carpenter
>>Sent: Sat 11/19/2005 10:25 PM
>>To: Fedora-Redhat-List
>>Subject: Multiple IP with one nic
>>
>>I have several servers that are not doing to much and I need to combine them
>>in to one. Is there anyway that I can give one server multiple IP's and
>>hostnames? So the network will see this one server as several?
>>
>>Thanks,
>>
>>
>>    
>>
>
>
>
>create file:
>
>/etc/sysconfig/network-scripts/ifcfg-eth0:0
>
>in it put:
>
>#######
>DEVICE=eth0:0
>BOOTPROTO=static
>BROADCAST=10.10.0.255
>IPADDR=10.10.0.150
>NETMASK=255.255.255.0
>NETWORK=10.10.0.0
>ONBOOT=yes
>TYPE=Ethernet
>#######
>
>
>replace the information in this example with your network settings, then restart the network
>
>service network restart
>
>Test, and repeat with eth0:1 eth0:2 and so on.
>
>       -Mike
>
>  
>
Actually these aliased interface definitions inherit settings from the 
parent interface defined by ifcfg-eth0
So all you need in ifcfg-eth0:0 etcetera are the changed settings, e.g.

DEVICE=eth0:0
IPADDR=10.10.0.150


FYI - aliased interface definitions are applied when the parent 
interface is started or stopped, So ifup eth0 will also bring up 
eth0:0.  It used to be true and still may be - I haven't tested recently 
- that ifcfg-eth0 has ONBOOT=yes then the aliased interfaces will be 
brought up at boot regardless of the ONBOOT setting in ifcfg-eth0:0 file.

Chris

-- 
   "Spend less!  Do more!  Go Open Source..." -- Dirigo.net
   Chris Johnson, RHCE #807000448202021