What is static routing in linux

In Linux, static routing is a routing method in which routing items are manually set; even if the network status has changed or been reconfigured, static routing is fixed and static routing is determined by the network administrator one by one. To add an item to the routing table, you can use the "route add -net to add a route to a certain network segment" statement to add a route in Linux.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

What is static routing in linux

What is static routing

Static routing (English: Static routing) is a routing method. Routing entries are manually configured rather than dynamically determined. Unlike dynamic routing, static routing is fixed and will not change, even if the network conditions have changed or been reconfigured. Generally speaking, static routes are added to the routing table item by item by the network administrator.

Advantages

Another benefit of using static routing is high network security and confidentiality. Dynamic routing requires frequent exchange of routing tables between routers, and analysis of routing tables can reveal information such as network topology and network addresses. Therefore, the network can also use static routing for security reasons. No network bandwidth is consumed because static routing does not generate update traffic. Static routing is suitable for small and medium-sized networks.

Disadvantages

Large and complex network environments are usually not suitable for static routing. On the one hand, it is difficult for network administrators to fully understand the topology of the entire network; on the other hand, when the network topology and link status change, the static routing information in the router needs to be adjusted on a large scale, which is very difficult. and the level of complexity is very high. When the network changes or a network failure occurs, routing cannot be reselected, which may cause routing failure.

Static route modification command under Linux

Method 1:

Add route

route add -net 192.168.0.0/24 gw 192.168.0.1
route add -host 192.168.1.1 dev 192.168.0.1

Delete route

route del -net 192.168.0.0/24 gw 192.168.0.1

add Add route

del Delete route

-net Set the route to a certain network segment

-host Set the route to a certain host

gw Exit gateway IP address

dev Exit gateway physical device name

Add default route

route add default gw 192.168.0.1

One default route is enough

route -n View routing table

Method 2:

Add route

ip route add 192.168.0.0/24 via 192.168.0.1
ip route add 192.168.1.1 dev 192.168.0.1

Delete route

ip route del 192.168.0.0/24 via 192.168.0.1

add Add route

del delete route

via gateway egress IP address

dev gateway egress physical device name

add default route

ip route add default via 192.168.0.1 dev eth0

via 192.168. 0.1 is my default router

View routing information

ip route

Save the routing settings so that they will remain valid after the network is restarted

In /etc Create a file named route-eth0 in the /sysconfig/network-script/ directory

vi /etc/sysconfig/network-script/route-eth0

Add content in the following format to this file

192.168.1.0/24 via 192.168.0.1

Restart network verification

/etc There are these lines in /rc.d/init.d/network:

# 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

In other words, just add static routes to the /etc/sysconfig/static-routes file.

If you add:

route add -net 11.1.1.0 netmask 255.255.255.0 gw 11.1.1.1

, the format of static-routes is

any net 11.1.1.0 netmask 255.255.255.0 gw 11.1.1.1

Recommended learning: Linux video tutorial

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