The netstat Command

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1.Displaying the Routing Table

# netstat -nrKernel IP routing tableDestination Gateway Genmask Flags MSS Window irtt Iface127.0.0.1 * 255.255.255.255 UH 0 0 0 lo172.16.1.0 * 255.255.255.0 U 0 0 0 eth0172.16.2.0 172.16.1.1 255.255.255.0 UG 0 0 0 eth0

2.Displaying Interface Statistics

# netstat -iKernel Interface tableIface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flagslo 0 0 3185 0 0 0 3185 0 0 0 BLRUeth0 1500 0 972633 17 20 120 628711 217 0 0 BRU

3.Displaying Connections

$ netstat -taActive Internet ConnectionsProto Recv-Q Send-Q Local Address Foreign Address (State)tcp 0 0 *:domain *:* LISTEN tcp 0 0 *:time *:* LISTEN tcp 0 0 *:smtp *:* LISTEN tcp 0 0 vlager:smtp vstout:1040 ESTABLISHED tcp 0 0 *:telnet *:* LISTEN tcp 0 0 localhost:1046 vbardolino:telnet ESTABLISHED tcp 0 0 *:chargen *:* LISTEN tcp 0 0 *:daytime *:* LISTEN tcp 0 0 *:discard *:* LISTEN tcp 0 0 *:echo *:* LISTEN tcp 0 0 *:shell *:* LISTEN tcp 0 0 *:login *:* LISTEN

Link: http://www.faqs.org/docs/linux_network/x-087-2-iface.netstat.html