# ip -s link
1:lo:<LOOPBACK,UP,LOWER_UP>mtu16436qdisc noqueue state UNKNOWN
link/loopback00:00:00:00:00:00brd00:00:00:00:00:00
RX:bytes packets errors dropped overrun mcast
2255610398556534 0 0 0 0
TX:bytes packets errors dropped carrier collsns
2255610398556534 0 0 0 0
2:eth0:<BROADCAST,MULTICAST,UP,LOWER_UP>mtu1500qdisc pfifo_fast state UP qlen1000
link/ether00:19:bb:5b:07:34brd ff:ff:ff:ff:ff:ff
RX:bytes packets errors dropped overrun mcast
32683320875724229790 0 0 16733497
TX:bytes packets errors dropped carrier collsns
2604833405168312850 0 0 0
“netstat -s” 提供了各个协议下的统计信息，有些统计值比如retransmit是很有用的，只有 “netstat -s” 能看到：
# netstat -s
...
Tcp:
71479active connections openings
7181passive connection openings
13723failed connection attempts
407connection resets received
1connections established
18969163segments received
11210435segments send out
85883segments retransmited
0bad segments received.
80162resets sent
...
475fast retransmits
30forward retransmits
110retransmits inslow start
22772other TCP timeouts
5sack retransmits failed
...