ethtool

SafeNIC link diagnostics

ethtool <iface>

Shows link speed, duplex and state. Essential when a 1G port negotiates at 100M, etc.

Examples

ethtool eth0 | grep -E 'Speed|Duplex|Link'Check speed and link

Syntax

ethtool [-s] <iface>

Before you run it

Changing settings with -s drops the link.

Related commands

ip addrShow IP/routes
nmcliManage NetworkManager
show interfacesInterface details/errors

The same reference, with no signal at all

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