Linux setup default gateway with route command

by on August 2, 2006 · 29 comments· LAST UPDATED August 16, 2007

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Q. How do I setup default gateway with a route command?

A. route command show and/or manipulate the IP routing table under Linux and UNIX oses.

Route manipulates the kernel's IP routing tables. Its primary use is to set up static routes to specific hosts or networks via an interface after it has been configured with the ifconfig program. When the add or del options are used, route modifies the routing tables. Without these options, route displays the current contents of the routing tables.

Display default route

Following three-command display the current routing table:
# route
Output:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 ra0
default         dsl-router      0.0.0.0         UG    0      0        0 ra0

$ /sbin/route
Output:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
191.255.255.0   *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         191.255.255.1   0.0.0.0         UG    0      0        0 eth0

You can use -n option, to display numerical addresses instead of trying to determine symbolic host names (via dns or /etc/hosts file). This is useful if you are trying to determine why the route to your nameserver has vanished.$ /sbin/route -nOutput:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
191.255.255.0   0.0.0.0         255.255.255.0   U     0      0        0 venet0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 venet0
0.0.0.0         191.255.255.1   0.0.0.0         UG    0      0        0 venet0

Please note that a destionation entry 0.0.0.0 (or default) is the default gatway. In above example 191.255.255.1 is a default gatway.

Add / setup a new route

The syntax is as follows:
route add default gw {IP-ADDRESS} {INTERFACE-NAME}

Where,

  • IP-ADDRESS: Specify router IP address
  • INTERFACE-NAME: Specify interface name such as eth0

For example if your router IP address is 192.168.1.254 type the following command as the root user:
# route add default gw 192.168.1.254 eth0OR use hostname such as dsl-router:# route add default gw dsl-router eth0

Setting route using GUI tools/command under Linux

If you find above command hard to use, consider using GUI tools. If your are using Red Hat/CentOS/Fedora core Linux type following command:# redhat-config-networkOR If you are using other Linux distribution use command:# network-admin

See also

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{ 29 comments… read them below or add one }

1 John Olivares March 6, 2008 at 8:30 pm

Great site thanks

Reply

2 Veeru November 16, 2011 at 7:37 am

Good one! Very usefull info

Reply

3 Ken April 15, 2008 at 11:57 pm

Running BT3 on an eeePC, I’ve been finding that I have to run:

# route add -net 0.0.0.0 dev ath0

to get my wireless to connect to the internet.

Reply

4 m@m August 27, 2008 at 7:08 am

usefull commands..

Thanks.
m@m

Reply

5 Dan smooth operator October 1, 2008 at 12:42 pm

Short, distinct and very good!

Reply

6 Forum January 22, 2009 at 2:15 pm

It was really useful!!

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7 velayutham February 3, 2009 at 4:25 pm

It was usefull at the urgent time

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8 winifredO February 25, 2009 at 11:24 am

so inetresting and useful! thanks

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9 robert April 13, 2009 at 5:32 am

Thanks for these hints.

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10 NannY May 5, 2009 at 7:15 am

Thanks so much
Very Helpful!!
Cheers,

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11 carlos guerrero May 14, 2009 at 12:34 am

hi very very thanks , for you posted i realy helpme very much!!!!

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12 mc.god July 16, 2009 at 8:22 pm

Very useful hint as a fast reminder, thank you ^^

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13 Al September 20, 2009 at 7:29 pm

great work fellows.good to go,Thank you for tips and tricks

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14 admtsh December 30, 2009 at 3:35 am

Thank you!
very nice examples!

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15 Quek April 1, 2010 at 5:03 am

Thank you very much, is a good and effective guide.

Reply

16 sundaram August 6, 2010 at 1:34 pm

when i used the command, i got the following error:

# route add default gw 10.102.237.71 eth4
SIOCADDRT: No such process

could you please guide me?

Reply

17 Chris Happel September 13, 2010 at 2:48 pm

I was getting that, too. Turns out I was putting in the wrong interface. Use the ‘route’ command without any parameters, and confirm that the 10.102.237.0 network is really attached to interface eth4. My problem now is that the server keeps ‘forgetting’ my default gateway, even though it’s in my /etc/network/interfaces file:

auto eth0
iface eth0 inet static
address 10.10.10.230
netmask 255.255.255.0
gateway 10.10.10.254
network 10.10.10.0
broadcast 10.10.10.255

What gives?

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18 niks December 28, 2010 at 5:29 am

useful commands…..thnks a ton

Reply

19 Alessandro April 21, 2011 at 3:27 pm

great tutorial … very usefull… thanks…

Reply

20 wri7913 June 28, 2011 at 1:11 am

Works on Natty 11.04 on ASUS G73sw laptop. Thanks for script! Ubuntu Devs should have already noticed and fixed this issue. Shame on them.

Reply

21 stevo November 4, 2011 at 8:36 am

Cool stuff guys…precise and straight

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22 Jose Tapia November 13, 2011 at 4:05 am

Very good tutorial thank you! you rocks buddy :D

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23 Christian November 14, 2011 at 11:15 am

Me a gustado mucho, gracias.

Reply

24 Sri April 17, 2012 at 7:59 am

Thanks a lot, very useful…

Saved be a lot of time and effort!!

Reply

25 Apu April 28, 2012 at 8:15 am

Hi All friends

Im going to Configure a Linux Gateway server for my LAN. It will locate in between router and my LAN.

I used 192.168.0.x private ip range for my LAN PCs. and im expecting to configure firewall, nat, proxy on that gateway server

who can guide me to do that.

Im new for linux and im interesting Linux

thanks
Apu

Reply

26 krishna August 21, 2012 at 10:31 am

hi ..
i helped me a lot

Reply

27 Mighty October 15, 2013 at 5:34 am

What is the difference between you example using this command:
# route add default gw 192.168.1.254 eth0

And inserting the gateway in the file below?
# vi /etc/sysconfig/network
GATEWAY=192.168.1.254

Reply

28 bA37 December 17, 2013 at 4:11 am

helped me a lot, thanks a lot dude…:)

Reply

29 Kapil Awadhwal April 24, 2014 at 11:50 am

Thanks for the short & good explaination…

Reply

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