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Re: Multiple IP-addresses on one interface





alexander dalloz uni-bielefeld de wrote:

Am Fr, den 07.05.2004 schrieb Ola Thoresen um 11:10:



What is the _right_ way to set multiple ip addresses on a single
interface.

I know I could either use ifcfg-eth0:0, ifcfg-eth0:1 and so on but I
would prefer not to have these "old" aliases.



Me too.




The problem with adding the addresses in rc.local (IE /sbin/ip addr add xx.xx.xx.xx/xx dev eth0) is that if services are
configured to listen to different addresses they will not start, unless
I also add 'service xxxx start' to the bottom of rc.local.



Correct, not that good.




This is not a huge problem, but there should be a better way than
repeating the whole init after the addresses are set in rc.local.





Rgds.

Ola Thoresen



I had exactly the same problem with my FC1 server too, handling a /27 net. Unfortunately the system is only prepared for aliased device range handling. I asked on the devel list but did not fill in an RFE with bugzilla.

So finally I "hacked" it into the system script that sets up the
devices. Though it works proper without any complications it is far from
best because it is a modification of a system script.

Go to /etc/sysconfig/network-scripts/ifup line 360. Below that line add
following:

   if [ ${DEVICE} = "eth0" ]; then
        for i in `seq 101 126`; do
           ip addr add 128.21.220.$i/27 brd 128.21.220.127 dev eth0
label eth0
        done
   fi

(that is a 5 liner; the line starting with "ip addr" ends with "label
eth0" is single, probably wrapped in mail)

That will add IPs 128.21.220.101 - 128.21.220.126 to the eth0 device,
given that all IPs are in the same net (have same netmask). You can list
assigned IPs using "ip addr list". "ifconfig" is limited and will not
show you the additional IPs.

Alexander




Just curious - what if you appended your address in /etc/sysconfig/network-scripts/ifcfg-eth0 to

IPADDR=128.21.220.101-126

or

IPADDR=128.21.220.101-128.21.220.126

worth a go :-)

neil



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