Analysis of Two Implementation Methods of Adding Static Routing to Linux

To add a route:

1.route add

route add-net 192.56. 76.0 netmask 255.255. 255.0 dev eth0 # Add a static route
route add default gw 192.168. 0.1 # Add default route
route del-net 192.168. 1.0/24 gw 192.168. 0.1 # Delete 1 route
route-n # View Routing Table

2.ip ro add

ip ro add 192.56. 76.0/24 dev 192.168. 0.1 # Add a static route
ip ro add default via 192.168. 0.1 dev eth0 # Add default route
ip ro del 192.168. 1.0/24 # Delete 1 Route ip route show # View Routing Table

Common parameters:

add Added Routing del Delete Route via Gateway Exit IP Address dev Gateway Exit Physical Device Name

Let the route still take effect after restarting the server:

1. In/etc/rc. local, add:

Add the routing command as follows: directly copy the command operated on the command line to the file, save and exit.

2. In the/etc/sysconfig/static-routes file, write:

If the file does not exist, it is created manually, and the added content format is:

Refer to the shell statement in the/etc/init. d/network file:

# Add non interface-specific static-routes.
if [ -f /etc/sysconfig/static-routes]; then grep "^any" /etc/sysconfig/static-routes | while read ignore args;
do /sbin/route add -$args
done
fi

Then, if you want to add 1 static route, the command is:

route add -net 192.56.76.0 netmask 255.255.255.0 dev eth0

Then, add the format in the/etc/sysconfig/static-routes file:

any net 192.56.76.0 netmask 255.255.255.0 dev eth0

Or

any net 192.56.76.0 netmask 255.255.255.0 gw 192.168.1.1

Comparison of two ways to add static routes:

1. rc. local:

Restart the server to take effect;

If the network service is restarted, the static route will fail;

rc. local is the last script to run after the system starts, so if there is a service requirement that needs network to mount like NFS, this method is not suitable;

2. static-routes:

Restart the server to take effect;

Restart network service takes effect:

Services suitable for network needs;

The script adds static routes in a way similar to rc. local:

In fact, this method also writes its own script, which is set to S at the beginning of/etc/rc3.d/.

S means start, the number is sequence, and K means stop.

1 is the startup sequence of daemons in a certain mode.

The smaller the number, the higher the starting sequence;

/etc/rc3. d is a text multi-user environment, which is used in all production environments.

** If you need to add static routes, try to add static routes to the/etc/sysconfig/static-routes file. Avoid routing failure caused by restarting network services, thus avoiding failure. **