Changing default global IP gateway in CentOS 5.6

mdef · Post by **mdef** » 2012/07/09 13:23:01

Hello everybody,

I need to change the global IP gateway in CentOS 5.6, i.e., the one chosen when no other more specific route is available.
Apparently, CentOS selects the gateway for the physical device with the highest index (in my case, eth3). But I want eth0.
I can only change it manually:
> route add default gw
> route del default gw
But I want to change it permanently (surviving reboots).
I have tried /etc/sysconfig/network-scripts/route-eth0 and NETWORK=0.0.0.0 with no success.

Any help would be appreciated.

Thank you.

Regards,

Jos?.

gerald_clark · Post by **gerald_clark** » 2012/07/09 13:29:25

Welcome to centOS.
New members should read:
http://www.centos.org/modules/newbb/viewforum.php?forum=47

Set "GATEWAY=XXX.XXX.XXX.XXX" in /etc/sysconfig/network.

mdef · Post by **mdef** » 2012/07/09 16:11:51

We already have that parameter in /etc/sysconfig/network, but unfortunately CentOS ignores it.

mdef · Post by **mdef** » 2012/07/09 16:43:58

Your clue was very helpful.
There was a profile called "default" (created by the DVD installer), and the interpreted network file was rather /etc/sysconfig/networking/profiles/default/network.
Once I have set GATEWAY there, the default gateway has been applied correctly.

Thank you very much.

jlehtone · Post by **jlehtone** » 2012/07/09 18:27:45

The /etc/sysconfig/networking/* are probably created by "system-config-network" or equivalent. Pay attention to what files are symlinked and whether you could get rid of the /etc/sysconfig/networking/* entirely.

kamel.berrayah · Post by **kamel.berrayah** » 2014/01/04 00:27:58

Hi
I already chabge the value in /etc/sysconfig/networking/profiles/default/network but it s not woek for me

Post by **TrevorH** » 2014/01/04 00:41:52

Please post the contents of /etc/sysconfig/network and also /etc/sysconfig/network-scripts/ifcfg-*

The 'network' file should work unless you also have GATEWAY= lines in the ifcfg files (which should be removed).

kamel.berrayah · Post by **kamel.berrayah** » 2014/01/05 00:25:16

Hi

My problem is resolved when I did this :

ifconfig eth0 ip 192.168.1.6 mask 255.255.255.0

route delete default gw 192.168.1.6 eth0
route add default gw 192.168.1.254 eth0

Post by **TrevorH** » 2014/01/05 00:40:37

You really should not need to do this manually. As I requested before, please post the contents of /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-* and I am fairly sure we can fix this.

kamel.berrayah · Post by **kamel.berrayah** » 2014/01/05 01:13:05

now I have this in the configuration

[root@CENTOS6 ~]# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=CENTOS6
[root@CENTOS6 ~]#

[root@CENTOS6 ~]# cat /etc/sysconfig/network-scripts/ifcfg-*
TYPE=Ethernet
BOOTPROTO=none
IPADDR=192.168.1.195
PREFIX=24
GATEWAY=192.168.1.2
DNS1=8.8.8.8
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME=eth6
UUID=492b341a-b7c8-4c57-873c-e44b64b1f8e1
ONBOOT=yes
DEVICE=eth6
USERCTL=yes
HWADDR=00:0c:29:ea:81:40
NETMASK=255.255.255.0
DEVICE=lo
IPADDR=127.0.0.1
NETMASK=255.0.0.0
NETWORK=127.0.0.0
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback

CentOS