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Pre-requisite Switching Routing Gateways

• Take me to Lecture

In this section, we will take a look at Switching, Routing and Gateways

Switching

• To see the interface on the host system

$ ip link

• To see the IP Address interfaces.

$ ip addr

Routing

• To see the existing routing table on the host system.

$ route

$ ip route show
or
$ ip route list

• To add entries into the routing table.

$ ip route add 192.168.1.0/24 via 192.168.2.1

Gateways

• To add a default route.

  $ ip route add default via 192.168.2.1
  

• To check the IP forwarding is enabled on the host. ``` $ cat /proc/sys/net/ipv4/ip_forward 0

$ echo 1 > /proc/sys/net/ipv4/ip_forward

- Enable packet forwarding for IPv4.

$ cat /etc/sysctl.conf

Uncomment the line

net.ipv4.ip_forward=1

- To view the sysctl variables.

$ sysctl -a

- To reload the sysctl configuration.

$ sysctl –system ```