What is static routing UG in linux?
Static routing UG in Linux is a common identifier in the static routing table, indicating the default gateway. It refers to the next hop that will be used when the host needs to send a data packet to a network that is not directly connected to it. Routers, default gateways are usually located at the boundary of the network to which the host is connected and are responsible for forwarding data packets to other networks.
The operating system of this tutorial: Linux5.18.14 system, Dell G3 computer.
In Linux, static routing is a manually configured routing method used to specify forwarding rules for network packets. UG is a common identifier in static routing tables, indicating the default gateway (Default Gateway).
The default gateway refers to the next-hop router that will be used when a host needs to send packets to a network that is not directly connected to it. The default gateway is usually located at the boundary of the network to which the host is connected and is responsible for forwarding packets to other networks.
In the Linux static routing table, UG refers to the routing entry of the default gateway. In the command route -n that outputs the static routing table, UG represents the default route under the target column, and the IP address of the default gateway is specified under the gateway column.
For example, the following is sample output from the route -n command:
Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0
In this example, 0.0.0.0 in the Destination column represents the default route, and 192.168.1.1 in the Gateway column represents the default The IP address of the gateway. UG in the Flags column represents the default gateway. And eth0 refers to the egress interface of the data packet.
After this configuration, when the host wants to access a network that is not directly connected to it, it will send the data packet to the default gateway. The default gateway will be responsible for sending packets to other networks and enabling hosts to communicate with other networks.
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