What's default gateway?
A default gateway is a network device that acts as an entry or exit point for traffic to and from a network. In other words, it is the router or layer 3 switch that connects a local network to the internet or another network.
When a device such as a computer or server needs to communicate with a device on a different network, it sends the traffic to its default gateway. The default gateway then routes the traffic to its destination network. Similarly, when a device on a different network needs to communicate with a device on the local network, it sends the traffic to the default gateway, which then routes the traffic to its destination on the local network.
The default gateway is usually set to the IP address of the router or layer 3 switch that connects the local network to the internet or another network. Devices on the local network are configured with the IP address of the default gateway as part of their network configuration, so they know where to send traffic that is not destined for the local network.
show route table for ipv4
To show the route table for IPv4 on a device, you can use the command prompt or terminal of the device to run the appropriate command. The specific command may vary depending on the operating system and device, but here are a few examples:
On Windows:
- Open the Command Prompt and run the command "route print". This will display the routing table for IPv4 on the device.
On Linux:
- Open the Terminal and run the command "ip route show". This will display the routing table for IPv4 on the device.
- Alternatively, you can also run the command "route -n" to display the routing table for IPv4 in a more concise format.
On macOS:
- Open the Terminal and run the command "netstat -rn". This will display the routing table for IPv4 on the device.
In general, the route table for IPv4 contains information about the network destinations that the device can reach, the gateway or next hop that the device should use to reach each destination, and other related information such as the interface used to reach each destination. The route table is used by the device to determine the best path for routing traffic to its destination.