Linux下常用網絡命令總結

 　　你可以使用以下任何一個命令：

　　nstat 命令 : 網絡統計工具

　　鍵入以下命令:

　　代碼如下:

　　# nstat

　　輸出樣例:

　　#kernel

　　IpInReceives 133243 0.0

　　IpInDelivers 133243 0.0

　　IpOutRequests 92904 0.0

　　IcmpOutErrors 97 0.0

　　IcmpOutTimeExcds 97 0.0

　　IcmpMsgOutType3 97 0.0

　　TcpActiveOpens 538 0.0

　　TcpEstabResets 56 0.0

　　TcpInSegs 129837 0.0

　　TcpOutSegs 89720 0.0

　　TcpRetransSegs 42 0.0

　　TcpOutRsts 704 0.0

　　UdpInDatagrams 3255 0.0

　　UdpNoPorts 97 0.0

　　UdpOutDatagrams 3270 0.0

　　Ip6OutNoRoutes 206 0.0

　　TcpExtTW 141 0.0

　　TcpExtDelayedACKs 508 0.0

　　TcpExtDelayedACKLocked 1 0.0

　　TcpExtDelayedACKLost 42 0.0

　　TcpExtTCPHPHits 117659 0.0

　　TcpExtTCPPureAcks 2158 0.0

　　TcpExtTCPHPAcks 605 0.0

　　TcpExtTCPSackRecovery 1 0.0

　　TcpExtTCPLossUndo 16 0.0

　　TcpExtTCPSackFailures 4 0.0

　　TcpExtTCPFastRetrans 1 0.0

　　TcpExtTCPSlowStartRetrans 3 0.0

　　TcpExtTCPTimeouts 33 0.0

　　TcpExtTCPDSACKOldSent 40 0.0

　　TcpExtTCPDSACKRecv 5 0.0

　　TcpExtTCPAbortOnData 120 0.0

　　TcpExtTCPAbortOnClose 55 0.0

　　TcpExtTCPSackShiftFallback 9 0.0

　　IpExtInOctets 180131682 0.0

　　IpExtOutOctets 7289106 0.0

　　ss 命令 : 查詢套接字工具

　　要查看統計匯總, 輸入:

　　代碼如下:

　　# ss -s

　　輸出樣例:

　　Total: 786 (kernel 804)

　　TCP: 65 (estab 40, closed 7, orphaned 0, synrecv 0, timewait 6/0), ports 56

　　Transport Total IP IPv6

　　* 804 - -

　　RAW 1 1 0

　　UDP 12 9 3

　　TCP 58 52 6

　　INET 71 62 9

　　FRAG 0 0 0

　　netstat 命令 : 不錯的顯示套接字信息的舊工具

　　查看所有網絡端口以及匯總信息表，輸入：

　　代碼如下:

　　# netstat -i

　　輸出樣例:

　　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 941022 0 0 0 688165 0 0 0 BMRU

　　lo 16436 0 9304 0 0 0 9304 0 0 0 LRU

　　ppp0 1496 0 3784 0 0 0 4177 0 0 0 MOPRU

　　查看每個協議的匯總統計信息，輸入：

　　代碼如下:

　　# netstat -s

　　輸出樣例:

　　Ip:

　　1092065 total packets received

　　0 forwarded

　　0 incoming packets discarded

　　1091681 incoming packets delivered

　　798913 requests sent out

　　895 dropped because of missing route

　　759 reassemblies required

　　375 packets reassembled ok

　　Icmp:

　　17 ICMP messages received

　　0 input ICMP message failed.

　　ICMP input histogram:

　　timeout in transit: 8

　　echo replies: 9

　　1747 ICMP messages sent

　　0 ICMP messages failed

　　ICMP output histogram:

　　destination unreachable: 1730

　　echo request: 17

　　IcmpMsg:

　　InType0: 9

　　InType11: 8

　　OutType3: 1730

　　OutType8: 17

　　Tcp:

　　4822 active connections openings

　　1129 passive connection openings

　　457 failed connection attempts

　　165 connection resets received

　　7 connections established

　　1062519 segments received

　　771394 segments send out

　　7158 segments retransmited

　　6 bad segments received.

　　2578 resets sent

　　Udp:

　　20846 packets received

　　1730 packets to unknown port received.

　　0 packet receive errors

　　19242 packets sent

　　UdpLite:

　　TcpExt:

　　71 invalid SYN cookies received

　　8 resets received for embryonic SYN_RECV sockets

　　142 packets pruned from receive queue because of socket buffer overrun

　　2109 TCP sockets finished time wait in fast timer

　　84 packets rejects in established connections because of timestamp

　　19454 delayed acks sent

　　6 delayed acks further delayed because of locked socket

　　Quick ack mode was activated 7306 times

　　1 packets directly queued to recvmsg prequeue.

　　1 bytes directly received in process context from prequeue

　　823921 packet headers predicted

　　24412 acknowledgments not containing data payload received

　　10150 predicted acknowledgments

　　242 times recovered from packet loss by selective acknowledgements

　　33 congestion windows recovered without slow start by DSACK

　　335 congestion windows recovered without slow start after partial ack

　　336 TCP data loss events

　　TCPLostRetransmit: 35

　　1 timeouts after reno fast retransmit

　　156 timeouts after SACK recovery

　　116 timeouts in loss state

　　461 fast retransmits

　　5 forward retransmits

　　608 retransmits in slow start

　　2073 other TCP timeouts

　　62 SACK retransmits failed

　　43074 packets collapsed in receive queue due to low socket buffer

　　8499 DSACKs sent for old packets

　　101 DSACKs sent for out of order packets

　　308 DSACKs received

　　9 DSACKs for out of order packets received

　　427 connections reset due to unexpected data

　　122 connections reset due to early user close

　　28 connections aborted due to timeout

　　TCPDSACKIgnoredOld: 3

　　TCPDSACKIgnoredNoUndo: 60

　　TCPSpuriousRTOs: 4

　　TCPSackShifted: 282

　　TCPSackMerged: 740

　　TCPSackShiftFallback: 1017

　　IpExt:

　　InMcastPkts: 47

　　OutMcastPkts: 51

　　InBcastPkts: 1

　　InOctets: 1341508973

　　OutOctets: 72525352

　　InMcastOctets: 8649

　　OutMcastOctets: 7519

　　InBcastOctets: 328

　　ip / ifconfig 命令 : 配置或者顯示網絡端口信息

　　鍵入以下命令:

　　代碼如下:

　　# ifconfig

　　或者

　　復制代碼

　　代碼如下:

　　# /sbin/ifconfig

　　或者

　　代碼如下:

　　# ifconfig eth0

　　eth0 Link encap:Ethernet HWaddr b8:ac:6f:65:31:e5

　　inet addr:192.168.1.5 Bcast:192.168.1.255 Mask:255.255.255.0

　　inet6 addr: fe80::baac:6fff:fe65:31e5/64 Scope:Link

　　UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

　　RX packets:966334 errors:0 dropped:0 overruns:0 frame:0

　　TX packets:703297 errors:0 dropped:0 overruns:0 carrier:0

　　collisions:0 txqueuelen:1000

　　RX bytes:1186255648 (1.1 GiB) TX bytes:73968238 (70.5 MiB)

　　Interrupt:17

　　lo Link encap:Local Loopback

　　inet addr:127.0.0.1 Mask:255.0.0.0

　　inet6 addr: ::1/128 Scope:Host

　　UP LOOPBACK RUNNING MTU:16436 Metric:1

　　RX packets:9666 errors:0 dropped:0 overruns:0 frame:0

　　TX packets:9666 errors:0 dropped:0 overruns:0 carrier:0

　　collisions:0 txqueuelen:0

　　RX bytes:1399578 (1.3 MiB) TX bytes:1399578 (1.3 MiB)

　　ppp0 Link encap:Point-to-Point Protocol

　　inet addr:10.1.11.70 P-t-P:10.0.31.18 Mask:255.255.255.255

　　UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1496 Metric:1

　　RX packets:3784 errors:0 dropped:0 overruns:0 frame:0

　　TX packets:4177 errors:0 dropped:0 overruns:0 carrier:0

　　collisions:0 txqueuelen:3

　　RX bytes:2400265 (2.2 MiB) TX bytes:275983 (269.5 KiB)

　　顯示網絡端口統計信息，輸入：

　　代碼如下: