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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