Comments on: Debian / Ubuntu Linux Setting a Default Gateway

By: Wael Hawa

Wael Hawa — Mon, 25 Jul 2011 20:55:15 +0000

I am using my nanostation 5 as a router… but I can’t receive ping from the ISP gateway… even though I have my ip in the same range. I found this site but the GW isn’t adding… Here are my tables

Destination Gateway Genmask Flags Metric Ref Use Iface
10.64.64.64 * 255.255.255.255 UH 0 0 0 ppp0
10.29.136.0 * 255.255.255.0 U 0 0 0 eth0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth0
default * 0.0.0.0 U 0 0 0 ppp0

My ip range is 10.29.136.0… I need to add 10.29.136.1 as GW

By: Mahmoud Ibrahim

Mahmoud Ibrahim — Sun, 20 Feb 2011 13:49:06 +0000

How can i use 2 gateway , I have a complex network using 2 ISP and Linux as a cache and firewall and a router.

i WANT lINUX router to be able to use both ISP in same time and could nat global IP.

By: Daniel Smith

Daniel Smith — Sat, 20 Mar 2010 12:07:54 +0000

How can I find Gateway server !? to add the numbers to the address code!?

By: Josh

Josh — Thu, 26 Nov 2009 04:04:23 +0000

I just switched to static ip’s and set everything through wicd..works perfectly. Also I used the network admin tool and I believe that screwed up lots of things.

By: Stuart Smith

Stuart Smith — Thu, 26 Nov 2009 02:33:07 +0000

I eventually removed Network Manager. Set everything up manually and it works fine.

By: joshlondon

joshlondon — Tue, 24 Nov 2009 01:39:51 +0000

I am having the same problem..I have to manually set my default gateway after each boot up even though all my network settings include it. How do I get it to stick?

By: Stuart Smith

Stuart Smith — Tue, 13 Oct 2009 14:30:36 +0000

I have the “gateway 192.168.1.1″ in my network file but I’m still required to manually set the route after reboot. This behavior began only after I “bonded” my two NIC’s. The routing table before the manual route command shows
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 bond0 192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth1 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 bond0
and after adds this one line just below the 169.254… line
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 bond0

Am I missing something or am I experiencing a true bug?

I’m using Kubuntu 9.04 Jaunty.

By: catalin

catalin — Wed, 16 Sep 2009 09:42:18 +0000

I am having some routing problems with Ubuntu 9.04:
Whenever I start up my system, the Internet won’t work unless I do:
"sudo route add default gw 192.168.1.254"
I tried to alter /etc/network/interfaces, but with no luck. After restart, it doesn’t work. executing route prints:
catalin@lolinux:~$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 wlan0
After I manually add the gateway, everything is fine, and route prints another gateway:
catalin@lolinux:~$ route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 wlan0 default dsldevice.lan 0.0.0.0 UG 0 0 0 wlan0
Is there any difference from what I altered and the kernel routing table? If there is, how do I modify that? Or would a startup script be a better solution?

By: Peter Holmes

Peter Holmes — Tue, 01 Sep 2009 11:30:34 +0000

I have two interfaces, eth0 & eth1. eth0 fixed IP 192.168.1.20 hardwired to test machine with fixed IP 192.168.1.6, (not easily altered).
I want eth1 to connect to internet via a DHCP Server Router. Without eth1 enabled there is no problem but as soon as I enable eth1 as DHCP client I lose any access to 192.168.1.6
Have spent many hours altering the route(s), etc., with no success.
Do I have to use ipchains or can it be achieved with route?

By: Kuldeep Yadav

Kuldeep Yadav — Fri, 06 Mar 2009 14:30:30 +0000

Is there any way,so that we can give proxy addresss frm command line apart from browser.because if we give this from command line,it will be applicable to all system.

By: adam

adam — Thu, 30 Oct 2008 06:22:21 +0000

For two interfaces that both do dhcp the metrics on the default gateway can be added like this.

auto eth1
iface eth1 inet dhcp
metric 10

auto eth2
iface eth2 inet dhcp
metric 20

By: Mauro

Mauro — Sat, 18 Oct 2008 17:26:35 +0000

vivek, many many many thanks. It works!

By: vivek

vivek — Sat, 18 Oct 2008 12:01:46 +0000

Run following to display default gateway: ip route show | grep default | awk '{ print $3}' Use following to store gateway IP in a variable called GW:

GW=$(ip route show | grep default | awk '{ print $3}')
echo $GW

By: Mauro

Mauro — Sat, 18 Oct 2008 10:05:45 +0000

How can I get (in a variable) the current default gateway? Is there a sort of “default gateway enviroment variable” that I can read?
Thanks

By: vivek

vivek — Tue, 02 Sep 2008 10:46:37 +0000

Petrus,

You need to install routed and configure /etc/gateway. Another recommended option is install zebra / Quagga server and configure it. Both allows you to define and configure various routing parameters including metric.

http://www.quagga.net/

By: Petrus

Petrus — Tue, 02 Sep 2008 10:09:16 +0000

How do I add a second gateway on higher metric incase the first goes down?

By: shutty

shutty — Wed, 16 Jul 2008 13:01:04 +0000

Rajesh,

for dns, edit file /etc/resolv.conf and add lines
nameserver 1.1.1.1
nameserver 2.2.2.2
(where 1.1.1.1 and 2.2.2.2 are your nameservers)

for proxy, use your browser configuration

By: Rajesh

Rajesh — Thu, 28 Feb 2008 17:31:24 +0000

I also want to set my defualt DNS server and proxy settings, just like in windows. How do I do that ??