networking (Note ifconfig, route, mii-tool, nslookup commands are obsolete)
ethtool eth0 Show status of ethernet interface eth0
ethtool --change eth0 autoneg off speed 100 duplex full Manually set ethernet interface speed
iwconfig eth1 Show status of wireless interface eth1
iwconfig eth1 rate 1Mb/s fixed Manually set wireless interface speed
• iwlist scan List wireless networks in range
• ip link show List network interfaces
ip link set dev eth0 name wan Rename interface eth0 to wan
ip link set dev eth0 up Bring interface eth0 up (or down)
• ip addr show List addresses for interfaces
ip addr add 1.2.3.4/24 brd + dev eth0 Add (or del) ip and mask (255.255.255.0)
• ip route show List routing table
ip route add default via 1.2.3.254 Set default gateway to 1.2.3.254
• tc qdisc add dev lo root handle 1:0 netem delay 20msec Add 20ms latency to loopback device (for testing)
• tc qdisc del dev lo root Remove latency added above
• host pixelbeat.org Lookup DNS ip address for name or vice versa
• hostname -i Lookup local ip address (equivalent to host `hostname`)
• whois pixelbeat.org Lookup whois info for hostname or ip address
• netstat -tupl List internet services on a system
• netstat -tup List active connections to/from system
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