Fixed IP under Red Hat 6.5

February 12, 2014

I have a Red Hat test server I needed to set up with a fixed IP address. Handy info with a good bit of info available so just a memory dump for handy reference.
Go to

cd /etc/sysconfig/network-scripts

It will probably be the first network card on the system if not adjust the eth number as appropriate

vi ifcfg-eth0

Edit the file adding entries like this

DEVICE=eth0  
BOOTPROTO=static  
IPADDR=192.168.1.10  
ONBOOT=yes  
DNS1=192.168.1.2  
DNS2=192.168.1.3  
DNS3=192.168.1.4  
DOMAIN=yourdomain.ie  
SEARCH=yourdomain.ie  
GATEWAY=192.168.1.1

For some reason the gateway settings wouldn’t work when entered into /etc/sysconfig/network but adding it to the network script did.

You need to restart the networking service for the changes to take effect.

/etc/init.d/networking restart

You should now have a fixed IP, you can check the other setting worked by

cat /etc/resolv.conf   

# Generated by NetworkManager  
search gms.ie  
nameserver 192.168.215.10  
nameserver 192.168.215.46  
nameserver 192.168.215.6  

route -n  

Kernel IP routing table  
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface  
192.168.1.0   0.0.0.0         255.255.255.0   U     1      0        0 eth0  
0.0.0.0         192.168.1.1   0.0.0.0         UG    0      0        0 eth0

Written by David Kerwick who lives and works Dublin as a Java Technical Lead.