Linux static route settings

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 static 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 above three routers are replaced by three PCs. To replace a router with a computer, you must enable the IP forwarding function of the computer. Change the content in/proc/sys/NET/IPv4/ip_forward to 1 (the default value is 0 ), run the following command to complete

# 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 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