监视网络接口TCP状态信息数据有多种工具或命令。下面举例一些：
nstat命令
复制代码代码如下:
# nstat
#kernel
IpInReceives97331040.0
IpInDelivers97331020.0
IpOutRequests 90585930.0
IcmpInErrors2147 0.0
IcmpInCsumErrors1143 0.0
IcmpInDestUnreachs20.0
IcmpInTimeExcds 1361 0.0
IcmpInParmProbs 56 0.0
IcmpInRedirects 10.0
IcmpInEchoReps7010.0
IcmpInTimestamps26 0.0
IcmpOutErrors 7500.0
IcmpOutTimeExcds23 0.0
IcmpOutEchoReps 26 0.0
IcmpOutTimestamps 7010.0
IcmpMsgInType026 0.0
IcmpMsgInType31361 0.0
IcmpMsgInType410.0
IcmpMsgInType87010.0
IcmpMsgInType11 56 0.0
IcmpMsgOutType0 7010.0
IcmpMsgOutType3 23 0.0
IcmpMsgOutType8 26 0.0
TcpActiveOpens678940 0.0
TcpPassiveOpens 910289 0.0
TcpAttemptFails 580180.0
TcpEstabResets146080.0
TcpInSegs 96865180.0
TcpOutSegs90382880.0
TcpRetransSegs6700 0.0
TcpInErrs 47 0.0
TcpOutRsts672490.0
UdpInDatagrams444090.0
UdpNoPorts23 0.0
UdpOutDatagrams 444410.0
Ip6InReceives 60.0
Ip6InNoRoutes 60.0
Ip6OutRequests90.0
Ip6OutNoRoutes3948 0.0
Ip6OutMcastPkts 14 0.0
Ip6InOctets 4320.0
Ip6OutOctets6120.0
Ip6OutMcastOctets 9920.0
Ip6InNoECTPkts60.0
Icmp6OutMsgs90.0
Icmp6OutRouterSolicits30.0
Icmp6OutNeighborSolicits10.0
Icmp6OutMLDv2Reports50.0
Icmp6OutType133 30.0
Icmp6OutType135 10.0
Icmp6OutType143 50.0
TcpExtSyncookiesFailed1400.0
TcpExtEmbryonicRsts 7040.0
TcpExtPruneCalled 23 0.0
TcpExtTW615681 0.0
TcpExtPAWSEstab 20 0.0
TcpExtDelayedACKs 521230.0
TcpExtDelayedACKLocked44 0.0
TcpExtDelayedACKLost1518 0.0
TcpExtListenDrops 32 0.0
TcpExtTCPPrequeued192580.0
TcpExtTCPDirectCopyFromBacklog451850.0
TcpExtTCPDirectCopyFromPrequeue 394312 0.0
TcpExtTCPHPHits 943072 0.0
TcpExtTCPHPHitsToUser 3478 0.0
TcpExtTCPPureAcks 32426250.0
TcpExtTCPHPAcks 547259 0.0
TcpExtTCPSackRecovery 6500.0
TcpExtTCPFACKReorder10.0
TcpExtTCPSACKReorder80.0
TcpExtTCPTSReorder23 0.0
TcpExtTCPFullUndo 10.0
TcpExtTCPPartialUndo23 0.0
TcpExtTCPDSACKUndo10.0
TcpExtTCPLossUndo 8540.0
TcpExtTCPLostRetransmit 1620.0
TcpExtTCPSackFailures 1350.0
TcpExtTCPLossFailures 18 0.0
TcpExtTCPFastRetrans1517 0.0
TcpExtTCPForwardRetrans 1040.0
TcpExtTCPSlowStartRetrans 1720.0
TcpExtTCPTimeouts 2764 0.0
TcpExtTCPLossProbes 5201 0.0
TcpExtTCPLossProbeRecovery2858 0.0
TcpExtTCPSackRecoveryFail 74 0.0
TcpExtTCPRcvCollapsed 4600.0
TcpExtTCPDSACKOldSent 1645 0.0
TcpExtTCPDSACKOfoSent 21 0.0
TcpExtTCPDSACKRecv8790.0
TcpExtTCPAbortOnData4314 0.0
TcpExtTCPAbortOnClose 3460.0
TcpExtTCPAbortOnTimeout 1860.0
TcpExtTCPDSACKIgnoredNoUndo 6150.0
TcpExtTCPSpuriousRTOs 95 0.0
TcpExtTCPSackShifted4020.0
TcpExtTCPSackMerged 2048 0.0
TcpExtTCPSackShiftFallback2592 0.0
TcpExtTCPRcvCoalesce145162 0.0
TcpExtTCPOFOQueue 366720.0
TcpExtTCPOFOMerge 21 0.0
TcpExtTCPChallengeACK 3290.0
TcpExtTCPSYNChallenge 47 0.0
IpExtInNoRoutes 20.0
IpExtInOctets 1568628267 0.0
IpExtOutOctets1158526375 0.0
IpExtInNoECTPkts98281300.0
IpExtInECT0Pkts 10 0.0
IpExtInCEPkts 30.0
ss命令
复制代码代码如下:
# ss -s
Total: 319 （kernel 752）
TCP: 187 （estab 114, closed 58, orphaned 0, synrecv 0, timewait 58/0）, ports 0
Transport Total IPIPv6
* 752 - -
RAW 0 0 0
UDP 3 2 1
TCP 129 113 16
INET132 115 17
FRAG0 0 0
netstat命令
复制代码代码如下:
# netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVRTX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 9001 0 219491600 0 1424609000 BMRU
lo65536 0 767059800 0 7670598000 LRU</p><p># netstat -s
Ip:
9743496 total packets received
0 forwarded
0 incoming packets discarded
9743494 incoming packets delivered
9068146 requests sent out
Icmp:
2147 ICMP messages received
1143 input ICMP message failed.
InCsumErrors: 2
ICMP input histogram:
destination unreachable: 1361
timeout in transit: 56
source quenches: 1
echo requests: 701
echo replies: 26
750 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 23
echo request: 26
echo replies: 701
IcmpMsg:
InType0: 26
InType3: 1361
InType4: 1
InType8: 701
InType11: 56
OutType0: 701
OutType3: 23
OutType8: 26
Tcp:
679665 active connections openings
911387 passive connection openings
58018 failed connection attempts
14608 connection resets received
118 connections established
9696894 segments received
9047825 segments send out
6700 segments retransmited
47 bad segments received.
67249 resets sent
Udp:
44425 packets received
23 packets to unknown port received.
0 packet receive errors
44457 packets sent
UdpLite:
TcpExt:
140 invalid SYN cookies received
704 resets received for embryonic SYN_RECV sockets
23 packets pruned from receive queue because of socket buffer overrun
616402 TCP sockets finished time wait in fast timer
20 packets rejects in established connections because of timestamp
52124 delayed acks sent
45 delayed acks further delayed because of locked socket
Quick ack mode was activated 1519 times
32 SYNs to LISTEN sockets dropped
19258 packets directly queued to recvmsg prequeue.
45185 bytes directly in process context from backlog
394312 bytes directly received in process context from prequeue
943942 packet headers predicted
3478 packets header predicted and directly queued to user
3246338 acknowledgments not containing data payload received
547737 predicted acknowledgments
650 times recovered from packet loss by selective acknowledgements
Detected reordering 1 times using FACK
Detected reordering 8 times using SACK
Detected reordering 23 times using time stamp
1 congestion windows fully recovered without slow start
23 congestion windows partially recovered using Hoe heuristic
1 congestion windows recovered without slow start by DSACK
854 congestion windows recovered without slow start after partial ack
TCPLostRetransmit: 162
135 timeouts after SACK recovery
18 timeouts in loss state
1517 fast retransmits
104 forward retransmits
172 retransmits in slow start
2764 other TCP timeouts
TCPLossProbes: 5202
TCPLossProbeRecovery: 2859
74 SACK retransmits failed
460 packets collapsed in receive queue due to low socket buffer
1646 DSACKs sent for old packets
21 DSACKs sent for out of order packets
879 DSACKs received
4314 connections reset due to unexpected data
346 connections reset due to early user close
186 connections aborted due to timeout
TCPDSACKIgnoredNoUndo: 615
TCPSpuriousRTOs: 95
TCPSackShifted: 402
TCPSackMerged: 2048
TCPSackShiftFallback: 2592
TCPRcvCoalesce: 145187
TCPOFOQueue: 36673
TCPOFOMerge: 21
TCPChallengeACK: 329
TCPSYNChallenge: 47
IpExt:
InNoRoutes: 2
InOctets: 1570012766
OutOctets: 1159491497
InNoECTPkts: 9838700
InECT0Pkts: 10
InCEPkts: 3
ip命令
复制代码代码如下:
# ip -s link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
RX: bytespacketserrorsdropped overrun mcast
88339557576722580 0 0 0
TX: bytespacketserrorsdropped carrier collsns
88339557576722580 0 0 0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 02:7a:7d:d2:f7:21 brd ff:ff:ff:ff:ff:ff
RX: bytespacketserrorsdropped overrun mcast
69475438121972680 0 0 0
TX: bytespacketserrorsdropped carrier collsns
29698040914252570 0 0 0
sar命令
复制代码代码如下:
# sar -n DEV 1
Linux 3.13.0-48-generic （beta）2015年08月17日_x86_64_（4 CPU）
14时46分54秒 IFACE rxpck/s txpck/srxkB/stxkB/s rxcmp/s txcmp/srxmcst/s %ifutil
14时46分55秒eth0 12.005.000.971.180.000.000.000.00
14时46分55秒lo 10.00 10.001.001.000.000.000.000.00
14时46分55秒 IFACE rxpck/s txpck/srxkB/stxkB/s rxcmp/s txcmp/srxmcst/s %ifutil
14时46分56秒eth01.001.000.050.470.000.000.000.00
14时46分56秒lo 16.00 16.002.172.170.000.000.000.00
14时46分56秒 IFACE rxpck/s txpck/srxkB/stxkB/s rxcmp/s txcmp/srxmcst/s %ifutil
14时46分57秒eth05.003.000.260.610.000.000.000.00
14时46分57秒lo 10.00 10.001.001.000.000.000.000.00
还有其它工具如nload，iftop等等，不一一列举了。
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