How to Find Default Gateway IP address on Linux

by skytech on October 22, 2012

A default gateway is the node (a router) or network point on the computer network that serves as an access point and entrance to another network. It passes traffic between different subnets and networks. Computers running on the network using IP, a default gateway address is needed to reach all computers that are not on the same local IP subnet. This post will show you how to Find default gateway IP address on linux operating system. This command has been tested on CentOS 6.3.

1. Print default gateway using route command :

[root@centos63 ~]# 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 eth0
link-local      *               255.255.0.0     U     1002   0        0 eth0
default         192.168.1.1     0.0.0.0         UG    0      0        0 eth0

2. Print default gateway using netstat command :

[root@centos63 ~]# netstat -rn

Output :

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 eth0

Note : The flag U indicates that route is up and G indicates that it is gateway.

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