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+# ethtool
+
+> Display and modify Network Interface Controller (NIC) parameters.
+> More information: <http://man7.org/linux/man-pages/man8/ethtool.8.html>.
+
+- Set the link speed, duplex mode, and parameter autonegotiation for a given interface:
+
+`ethtool -s {{eth0}} speed {{10|100|1000}} duplex {{half|full}} autoneg {{on|off}}`