Linux netstat 命令用于显示网络状态。
利用 netstat 指令可让你得知整个 Linux 系统的网络情况。
语法
代码语言：javascript复制netstat [-acCeFghilMnNoprstuvVwx][-A<网络类型>][--ip]参数说明：
- -a或--all 显示所有连线中的Socket。
- -A<网络类型>或--<网络类型> 列出该网络类型连线中的相关地址。
- -c或--continuous 持续列出网络状态。
- -C或--cache 显示路由器配置的快取信息。
- -e或--extend 显示网络其他相关信息。
- -F或--fib 显示路由缓存。
- -g或--groups 显示多重广播功能群组组员名单。
- -h或--help 在线帮助。
- -i或--interfaces 显示网络界面信息表单。
- -l或--listening 显示监控中的服务器的Socket。
- -M或--masquerade 显示伪装的网络连线。
- -n或--numeric 直接使用IP地址，而不通过域名服务器。
- -N或--netlink或--symbolic 显示网络硬件外围设备的符号连接名称。
- -o或--timers 显示计时器。
- -p或--programs 显示正在使用Socket的程序识别码和程序名称。
- -r或--route 显示Routing Table。
- -s或--statistics 显示网络工作信息统计表。
- -t或--tcp 显示TCP传输协议的连线状况。
- -u或--udp 显示UDP传输协议的连线状况。
- -v或--verbose 显示指令执行过程。
- -V或--version 显示版本信息。
- -w或--raw 显示RAW传输协议的连线状况。
- -x或--unix 此参数的效果和指定"-A unix"参数相同。
- --ip或--inet 此参数的效果和指定"-A inet"参数相同。
实例
显示详细的网络状况
代码语言：javascript复制# netstat -a显示当前户籍UDP连接状况
代码语言：javascript复制# netstat -nu显示UDP端口号的使用情况
代码语言：javascript复制# netstat -apu
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 *:32768 *:* -
udp 0 0 *:nfs *:* -
udp 0 0 *:641 *:* 3006/rpc.statd
udp 0 0 192.168.0.3:netbios-ns *:* 3537/nmbd
udp 0 0 *:netbios-ns *:* 3537/nmbd
udp 0 0 192.168.0.3:netbios-dgm *:* 3537/nmbd
udp 0 0 *:netbios-dgm *:* 3537/nmbd
udp 0 0 *:tftp *:* 3346/xinetd
udp 0 0 *:999 *:* 3366/rpc.rquotad
udp 0 0 *:sunrpc *:* 2986/portmap
udp 0 0 *:ipp *:* 6938/cupsd
udp 0 0 *:1022 *:* 3392/rpc.mountd
udp 0 0 *:638 *:* 3006/rpc.statd显示网卡列表
代码语言：javascript复制# netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 181864 0 0 0 141278 0 0 0 BMRU
lo 16436 0 3362 0 0 0 3362 0 0 0 LRU显示组播组的关系
代码语言：javascript复制# netstat -g
IPv6/IPv4 Group Memberships
Interface RefCnt Group
--------------- ------ ---------------------
lo 1 ALL-SYSTEMS.MCAST.NET
eth0 1 ALL-SYSTEMS.MCAST.NET
lo 1 ff02::1
eth0 1 ff02::1:ff0a:b0c
eth0 1 ff02::1显示网络统计信息
代码语言：javascript复制# netstat -s
Ip:
184695 total packets received
0 forwarded
0 incoming packets discarded
184687 incoming packets delivered
143917 requests sent out
32 outgoing packets dropped
30 dropped because of missing route
Icmp:
676 ICMP messages received
5 input ICMP message failed.
ICMP input histogram:
destination unreachable: 44
echo requests: 287
echo replies: 345
304 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 17
echo replies: 287
Tcp:
473 active connections openings
28 passive connection openings
4 failed connection attempts
11 connection resets received
1 connections established
178253 segments received
137936 segments send out
29 segments retransmited
0 bad segments received.
336 resets sent
Udp:
5714 packets received
8 packets to unknown port received.
0 packet receive errors
5419 packets sent
TcpExt:
1 resets received for embryonic SYN_RECV sockets
ArpFilter: 0
12 TCP sockets finished time wait in fast timer
572 delayed acks sent
3 delayed acks further delayed because of locked socket
13766 packets directly queued to recvmsg prequeue.
1101482 packets directly received from backlog
19599861 packets directly received from prequeue
46860 packets header predicted
14541 packets header predicted and directly queued to user
TCPPureAcks: 12259
TCPHPAcks: 9119
TCPRenoRecovery: 0
TCPSackRecovery: 0
TCPSACKReneging: 0
TCPFACKReorder: 0
TCPSACKReorder: 0
TCPRenoReorder: 0
TCPTSReorder: 0
TCPFullUndo: 0
TCPPartialUndo: 0
TCPDSACKUndo: 0
TCPLossUndo: 0
TCPLoss: 0
TCPLostRetransmit: 0
TCPRenoFailures: 0
TCPSackFailures: 0
TCPLossFailures: 0
TCPFastRetrans: 0
TCPForwardRetrans: 0
TCPSlowStartRetrans: 0
TCPTimeouts: 29
TCPRenoRecoveryFail: 0
TCPSackRecoveryFail: 0
TCPSchedulerFailed: 0
TCPRcvCollapsed: 0
TCPDSACKOldSent: 0
TCPDSACKOfoSent: 0
TCPDSACKRecv: 0
TCPDSACKOfoRecv: 0
TCPAbortOnSyn: 0
TCPAbortOnData: 1
TCPAbortOnClose: 0
TCPAbortOnMemory: 0
TCPAbortOnTimeout: 3
TCPAbortOnLinger: 0
TCPAbortFailed: 3
TCPMemoryPressures: 0显示监听的套接口
代码语言：javascript复制# netstat -l
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:32769 *:* LISTEN
tcp 0 0 *:nfs *:* LISTEN
tcp 0 0 *:644 *:* LISTEN
tcp 0 0 *:1002 *:* LISTEN
tcp 0 0 *:netbios-ssn *:* LISTEN
tcp 0 0 *:sunrpc *:* LISTEN
tcp 0 0 vm-dev:ipp *:* LISTEN
tcp 0 0 *:telnet *:* LISTEN
tcp 0 0 *:601 *:* LISTEN
tcp 0 0 *:microsoft-ds *:* LISTEN
tcp 0 0 *:http *:* LISTEN
tcp 0 0 *:ssh *:* LISTEN
tcp 0 0 *:https *:* LISTEN
udp 0 0 *:32768 *:*
udp 0 0 *:nfs *:*
udp 0 0 *:641 *:*
udp 0 0 192.168.0.3:netbios-ns *:*
udp 0 0 *:netbios-ns *:*
udp 0 0 192.168.0.3:netbios-dgm *:*
udp 0 0 *:netbios-dgm *:*
udp 0 0 *:tftp *:*
udp 0 0 *:999 *:*
udp 0 0 *:sunrpc *:*
udp 0 0 *:ipp *:*
udp 0 0 *:1022 *:*
udp 0 0 *:638 *:*
Active UNIX domain sockets (only servers)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 10621 @/tmp/fam-root-
unix 2 [ ACC ] STREAM LISTENING 7096 /var/run/acpid.socket
unix 2 [ ACC ] STREAM LISTENING 9792 /tmp/.gdm_socket
unix 2 [ ACC ] STREAM LISTENING 9927 /tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 10489 /tmp/ssh-lbUnUf4552/agent.4552
unix 2 [ ACC ] STREAM LISTENING 10558 /tmp/ksocket-root/kdeinit__0
unix 2 [ ACC ] STREAM LISTENING 10560 /tmp/ksocket-root/kdeinit-:0
unix 2 [ ACC ] STREAM LISTENING 10570 /tmp/.ICE-unix/dcop4664-1270815442
unix 2 [ ACC ] STREAM LISTENING 10843 /tmp/.ICE-unix/4735
unix 2 [ ACC ] STREAM LISTENING 10591 /tmp/ksocket-root/klauncherah3arc.slave-socket
unix 2 [ ACC ] STREAM LISTENING 7763 /var/run/iiim/.iiimp-unix/9010
unix 2 [ ACC ] STREAM LISTENING 11047 /tmp/orbit-root/linc-1291-0-1e92c8082411
unix 2 [ ACC ] STREAM LISTENING 11053 /tmp/orbit-root/linc-128e-0-dc070659cbb3
unix 2 [ ACC ] STREAM LISTENING 8020 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 58927 /tmp/mcop-root/vm-dev-2c28-4beba75f
unix 2 [ ACC ] STREAM LISTENING 7860 /tmp/.font-unix/fs7100
unix 2 [ ACC ] STREAM LISTENING 7658 /dev/gpmctl
unix 2 [ ACC ] STREAM LISTENING 10498 @/tmp/dbus-s2MLJGO5Ci
