Home / server / Questions / 108290
In Process
Dragos
Asked: 2010-02-02 04:45:49 +0800 CST

ip static route, make changes permanent/persistent upon reboot

  • 772

On CentOS 5 I manually added a static route to make all packets to one specific IP address use the second network interface:

ip route add 123.456.7.89/32 via 192.168.10.101 dev eth1

Is there a way to make this change be persistent on reboot without adding it to the startup script /etc/rc.d/rc.local?

linux routes

2 Answers

  1. Yes. Add the line:

    123.456.7.89/32 via 192.168.10.101 dev eth1

    to /etc/sysconfig/network-scripts/route-eth1 as shown here.

    • 7

  2. While this answer works, the current preferred format for /etc/sysconfig/network-scripts/route-ethX is:

    GATEWAY0=10.156.196.1
NETMASK0=255.255.254.0
ADDRESS0=10.156.248.0
GATEWAY1=10.156.196.1
NETMASK1=255.255.254.0
ADDRESS1=10.156.244.0

    Be sure to increment the value of the numeral when you add a route.

    Unfortunately, the new preferred format of GATEWAYX:/ADDRESSx:/NETMASKx:/ makes it harder to programmatically add static routes via the older format of 192.168.1.0/24 via 10.1.1.1. It can be worked around, but adds unnecessary complications to scripting routes.

    • 4