Linux static route Configuration

When you are studying linux, you may encounter the problem of configuring static routes. Here we will introduce the solution to the problem of configuring linux static routes. Here we will share with you. Now there are five devices: PC1 connected to ROUT1, ROUT1 connected to ROUT2, ROUT2 connected to ROUT3, and ROUT3 connected to PC2. The topology is shown below:

□---- ○ ---- □

PC1 ROUT1 ROUT2 ROUT3 PC2

The linux static Route IP addresses of the five devices are:
PC1 192.168.1.88/24
ROUT1 192.168.1.128/24 192.168.2.128/24
ROUT2 192.168.2.66/24 192.168.3.66/24
ROUT3 192.168.3.100/24 192.168.4.33/24
PC2 192.168.4.66/24

The PC1 configuration is as follows:
# Ifconfig eth0 192.168.1.88 netmask 255.255.255.0
# Route add default gw 192.168.1.128

Configure ROUT1 as follows:
# Ifconfig eth0 192.168.1.128 netmask 255.255.255.0
# Ifconfig eth0: 1 192.168.2.128 netmask 255.255.255.0
# Route add-net 192.168.4.0/24 gw 192.168.2.66

Configure ROUT2 as follows:
# Ifconfig eth0 192.168.2.66 netmask 255.255.255.0
# Ifconfig eth0: 1 192.168.3.66 netmask 255.255.255.0
# Route add-net 192.168.1.0/24 gw 192.168.2.128
# Route add-net 192.168.4.0/24 gw 192.168.3.100

Configure ROUT3 as follows:
# Ifconfig eth0 192.168.3.100 netmask 255.255.255.0
# Ifconfig eth0: 1 192.168.4.33 netmask 255.255.255.0
# Route add-net 192.168.1.0/24 gw 192.168.3.66

The PC2 configuration is as follows:
# Ifconfig eth0 192.168.4.66 netmask 255.255.255.0
# Route add default gw 192.168.4.33
In this way, PC1 can ping pc2.

Note:
The three above are replaced by three PCs. Use the following command to enable the IP forwarding function of the computer, and set/proc/sys/net/ipv4/ip_forward to 1 by default.
# E cho 1>/proc/sys/net/ipv4/ip_forward
After the network is restarted, the above file is automatically changed to 0
Add several commands:
1. Delete the default route
# Route del default
2. View linux static routes
# Route-n
3. Set a route entry for a specified CIDR Block
# Route add-net 192.168.3.0 netmask 255.255.255.0 gw 192.168.6.66
Or
# Route add-net 192.168.3.0/24 gw 192.168.6.66
4. delete a route entry
# Route del-net 192.168.3.0 netmask 255.255.255.0
Or
# Route del-net 192.168.3.0/24
The above describes how to configure linux static routes.

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