Linux Networking Commands

ip

Manage network devices

Manipulate routing table entries.

The output of the ip route command may look like this:

192.168.5.0/24 dev eth0 proto kernel scope link src 192.168.5.1 metric 100

This line represents a routing rule in the IP routing table of your system. Let’s break down each part:

Meaning: This specifies the destination network for the route. The 192.168.5.0/24 notation refers to the IP address range 192.168.5.0 to 192.168.5.255.
Details: The /24 indicates a subnet mask of 255.255.255.0, meaning the first 24 bits are the network part of the IP address, and the last 8 bits can vary to represent host addresses within that network.

Meaning: This tells the system to use the network interface eth0 to reach the 192.168.5.0/24 network.
Details: eth0 is the network interface on your system that is connected to this subnet.

Meaning: This indicates that the route was added by the kernel automatically, rather than by a user or a static configuration.
Details: Typically, routes are automatically added by the kernel when an IP address is assigned to an interface.
“proto dhcp” means route was added when ip was assigned by dhcp server

Meaning: The scope of the route is link, meaning it is valid only for directly connected hosts on the same link (i.e., the local network).
Details: This is typical for directly connected subnets where no intermediate routing is needed to reach the destination.

Meaning: This specifies the source IP address to be used when sending packets to the 192.168.5.0/24 network.
Details: 192.168.5.1 is the IP address assigned to the eth0 interface on your system. When sending packets to the 192.168.5.0/24 network, this address will be used as the source address.

Meaning: The metric value represents the cost of using this route. Lower values indicate preferred routes.
Details: A metric of 100 is a relative cost associated with this route. If there are multiple routes to the same destination, the one with the lowest metric will be chosen.

To manage bridge interfaces