Whether you’re troubleshooting network problems or trying to set up a VPN, knowing what address your computer has configured as the default gateway is always useful. Running a simple command from the terminal can give you this.

Use the following to enable IP (IPv4) Forwarding in RedHat linux.

Many malicious attacks begin with a ping scan. Disabling ICMP echo requests prevents your system’s discovery with a ping.

Determine the auto-negotiated Ethernet connection speed and duplex using the mii-tool command.

Using mii-tool, the speed and duplex of an ethernet interface can be set manually.