Linux—netstat命令

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

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FIB。
  • -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–statistice 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

# netstat -a

显示当前户籍UDP连接状况

# netstat -nu

显示UDP端口号的使用情况

# 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

# 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

# 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

# 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

# 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
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