How To Add Static Routes In Linux

<span style="font-family: Arial, Helvetica, sans-serif;"> <b>Adding Static Routes </b>On Various *NIX (Linux,AIX,HP-UX)</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><b>Static routes</b> are generally required for  traffic that must not, or should not, go through the default gateway. In this article we will discuss how to add static routes in variox nix.</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;"><b>Scenario </b>: Suppose if you want that all the traffic to network 172.168.102.0/24 should use 172.168.101.1 as gateway. This can be done by adding a static route in the kernel routing table as shown below.</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;"><b>Adding Static Route in Linux from the Command line :</b></span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Arial, Helvetica, sans-serif;"># route add -net 172.168.102.0 netmask 255.255.255.0 gw 172.168.101.1 dev eth0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">OR</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Arial, Helvetica, sans-serif;"># ip route add 172.168.102.0/24 via 172.168.101.1 dev eth0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">Above Commands will make changes to the routing table temporary and not permanent. Use any of below mention command To check Routing tables in Linux :</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> route -n</span><br /> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> netstat -nr</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;"><b>Steps to make the static Route Persistent Across the reboot :</b></span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">In case of RHEL5.X / CentOS 5.X</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">Create a file  route file</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> vi /etc/sysconfig/network-scripts/route-eth0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">172.168.102.0/24 via 172.168.101.1 dev eth0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">Save and close the file and  Restart network service</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> service network restart</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">In case of RHEL6.X / CentOS 6.X</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> vi /etc/sysconfig/network-scripts/route-eth0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">GATEWAY= 172.168.101.1</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;">NETMASK=255.255.255.0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;">ADDRESS= 172.168.102.0</span><br /> <span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="font-family: Arial, Helvetica, sans-serif;">Save and close the file and  Restart network service</span><br /> <span style="color: blue; font-family: Arial, Helvetica, sans-serif;"><br /></span> <span style="color: blue; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12px; line-height: 16.799999237060547px;">[root@amitmaheshwari.in ~]#</span><span style="color: blue; font-family: Arial, Helvetica, sans-serif;"> service network restart</span><br /> <div> <br /></div>

How To Add Static Routes In Linux

  Adding Static Routes On Various *NIX (Linux,AIX,HP-UX) Static routes are generally required for  traffic that must not, or should not, g...

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