static ip on CentOS (SIOCADDRT: File exists)

zodehala · 11-05-2008, 06:54 AM

i am trying to give staic ip to centos5 so using following commands(as root)
first

Code:

ifconfig eth0 192.168.1.100 netmask 255.255.255.0

than

Code:

route add default gw 192.168.1.1 dev eth0

following error occured

Code:

SIOCADDRT: File exists

hopbyhop · 11-05-2008, 07:34 AM

Please post the output of "route" and ifconfig first

zodehala · 11-05-2008, 07:50 AM

Code:

[root@zode ~]# 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     0      0        0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0


[root@zode ~]# netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.0     *               255.255.255.0   U         0 0          0 eth0
default         192.168.1.1     0.0.0.0         UG        0 0          0 eth0

hopbyhop · 11-05-2008, 07:54 AM

As you can see you already have your gateway configured. No need to run route add...

zodehala · 11-05-2008, 12:51 PM

Quote:

Originally Posted by hopbyhop

As you can see you already have your gateway configured. No need to run route add...

but i wanna change it how ?

hopbyhop · 11-06-2008, 01:41 AM

Code:

route del default
route add ....

zodehala · 11-10-2008, 08:41 AM

Quote:

Originally Posted by hopbyhop

Code:

route del default
route add ....

wheneever i restart computer why does static ip change ?

hopbyhop · 11-10-2008, 10:45 AM

On reboot network settings are defined by initialization scripts. If changes you tried are good, you have to edit system's network configuration files. Either run (in the graphical environment from root) system-config-network or edit /etc/sysconfig/network and change the gateway or any other parameter you need.
In the latter case you need also to manually restart the network (/sbin/service network restart) to make changes effective.