3.9 netstat Command

3.9 netstat Command

The netstat (1) command also provides information about the interfaces on a system. The -i flag prints the interface information, and the -n flag prints IP addresses instead of hostnames.

 sun %  netstat -in  Name   Mtu   Net/Dest       Address        Ipkts   Ierrs  Opkts  Oerrs  Collis  Queue    le0    1500  140.252.13.32  140.252.13.33  67719    0     92133   0     1       0    sl0    552   140.252.1.183  140.252.1.29   48035    0     54963   0     0       0    lo0    1536  127.0.0.0      127.0.0.1      15548    0     15548   0     0       0 

This command prints the MTU of each interface, the number of input packets, input errors, output packets, output errors, collisions, and the current size of the output queue.

We'll return to the netstat command in Chapter 9 when we use it to examine the routing table, and in Chapter 13 when we use a modified version to see active multicast groups.