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RedHat 7.2 network config issue

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by kma11

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I have a Redhat 7.2 server that I configured on my internal network and tested. Everything worked great. I moved it to the dmz and reconfigured the ip address accordingly. I could ping other machines on dmz. When I reboot, it loses all network configuration and gives the following message while linux boots: "Bringing up eth0, Error. Some other host already uses the address x.x.x.x." The problem is there is no other system using the address other than the one I just configured and it happens even if I assign different addresses. I have reseated the nic, reconfigured it numerous times, tried different nics, and checked all the /etc/hosts, etc/sysconfig/network, and etc/sysconfig/network-scripts/ifcfg-eth0. Everything looks ok. No pnp OS in the bios settings. Any ideas?

4 replies

by seann

We are expeiencing an almost identical issue, albeit with a different version of the OS...RHE 3. Have you found a resolution? Thanks.

by shanghai sam

1. My first thought is that there is a server in the fw, or network, that maps the IP to another network or host.
2. Triplecheck that the IP address You are using is valid for DMZ and not used by any other host.
3. Try another IP address to see if it produces same errormsg.
4. I dont know where You set the IP, at console or in the Red Hat Network Administration Tool
But if You used the console at first then
try to set IP after boot with ifconfig as below. I dont recommend this if you used the the Red Hat Network Administration Tool to set IP since ifconfig may mess up the settings. IMHO one should always stick to one of these consequent.(may need SU or Root):

ifconfig eth0 x.x.x.x netmask x.x.x.x up

Note that the ifconfig cmdabove sets IP immediately but the setting are lost at next reboot.
If this doesnt work and the host refuses to bind the new IP to eth0 with ifconfig then there is probably something wrong with the network settings in the host.

Hope this helps!
//Tom

by kma11

I actually did all those things but didn't realize that the ip would be lost at reboot. When I use netconfig it doesn't bind the address, but when I use ifconfig, it does bind it.

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