IP aliasing
Rick Stevens
rstevens at vitalstream.com
Wed Dec 13 21:40:54 UTC 2006
On Wed, 2006-12-13 at 13:17 -0800, Mike Wright wrote:
> Terry Polzin wrote:
> > Does anyone still use this?
> > Is it compiled into the default kernel?
> >
>
> It is very easy to add address(es) to an interface. From the command
> line you could use the "ip" command to manipulate network devices. You
> can also add routes and bring devices up and down, change their MAC, and
> many other fun things.
>
> ip addr add 1.2.3.4/24 dev eth5
> ip addr add 2.3.4.5/16 dev eth5
> ip addr add 3.4.5.6/8 dev eth5
>
> You would now have 3 addresses on different width subnets on one network
> device.
>
> Its man page is very terse but gives a very good idea of its power.
You can also create /etc/sysconfig/network-script/ifcfg-ethX:n
files to add aliases. Set them up like the original ifcfg-ethX
file, just change the "DEVICE", "IPADDR" and "NETMASK" stuff as
appropriate. You don't want any "HWADDR" or "GATEWAY" entries in
the aliases. Examples:
/etc/sysconfig/network-scripts/ifcfg-eth0:
DEVICE=eth0
BOOTPROTO=static
HWADDR=ZZ:YY:XX:WW:VV:UU
IPADDR=aaa.bbb.ccc.ddd
IPV6ADDR=
IPV6PREFIX=
NETMASK=255.255.255.0
ONBOOT=yes
/etc/sysconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
BOOTPROTO=static
IPADDR=eee.fff.ggg.hhh
IPV6ADDR=
IPV6PREFIX=
NETMASK=255.255.255.0
ONBOOT=yes
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer rstevens at vitalstream.com -
- VitalStream, Inc. http://www.vitalstream.com -
- -
- "I understand Windows 2000 has a Y2K problem." -
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