这125.193.242.25是一个CDN节点，当我分析TCP连接时，显示以下信息：
[root@hkk10 ~]# netstat -na
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:3311 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 103.193.242.26:80 118.25.234.139:54812 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:65233 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:46127 SYN_RECV
tcp 0 0 125.193.242.25:80 125.39.132.70:56691 SYN_RECV
tcp 0 0 125.193.242.25:80 125.39.46.58:62253 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:52071 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:42819 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:58816 SYN_RECV
tcp 0 0 125.193.242.25:80 117.136.123.136:51361 SYN_RECV
tcp 0 0 125.193.242.25:80 113.96.219.243:32847 SYN_RECV
tcp 0 0 125.193.242.25:80 113.100.245.181:60962 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:63496 SYN_RECV
tcp 0 0 125.193.242.25:80 123.151.77.74:65492 SYN_RECV
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:3319 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN
tcp 0 0 125.193.242.25:443 223.104.63.198:16044 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.181:44214 SYN_RECV
....
tcp 0 0 125.193.242.25:443 223.104.91.95:25672 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.69:19422 SYN_RECV
tcp 0 0 125.193.242.25:443 14.215.176.21:39372 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.90.12:23081 SYN_RECV
tcp 0 0 125.193.242.25:443 117.136.11.18:19140 SYN_RECV
tcp 0 0 125.193.242.25:443 117.136.12.101:3860 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.45.66:57152 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.165:21806 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.49:24690 SYN_RECV
tcp 0 0 125.193.242.25:443 14.215.176.21:39373 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.49:24688 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.44:10806 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.227:10877 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.49:24689 SYN_RECV
tcp 0 0 125.193.242.25:443 175.153.170.6:19427 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.6.48:7489 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.161:54779 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.1.149:32928 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.6.48:7487 SYN_RECV
....
tcp 0 0 125.193.242.25:443 117.136.79.139:58193 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.227:10876 SYN_RECV
tcp 0 0 125.193.242.25:443 14.215.176.148:44144 SYN_RECV
tcp 0 0 125.193.242.25:443 124.127.202.190:61350 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.49:24685 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.6.48:7488 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.64.131:42079 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.64.35:46918 SYN_RECV
tcp 0 0 125.193.242.25:443 175.153.170.6:19426 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.227:10879 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.91.95:25388 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.161:54784 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.227:10878 SYN_RECV
tcp 0 0 125.193.242.25:443 1.202.183.178:61356 SYN_RECV
tcp 0 0 125.193.242.25:443 117.136.11.18:19146 SYN_RECV
tcp 0 0 125.193.242.25:443 117.136.12.101:3859 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.44:10805 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.64.131:42083 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.181:44215 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.69:19421 SYN_RECV
tcp 0 0 125.193.242.25:443 111.225.149.36:10412 SYN_RECV
tcp 0 0 125.193.242.25:443 112.91.129.16:61731 SYN_RECV
tcp 0 0 125.193.242.25:443 1.202.88.54:61363 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.161:54783 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.165:21807 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.65.44:10809 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.69:19417 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.198:16045 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.69:19416 SYN_RECV
tcp 0 0 125.193.242.25:443 223.104.63.49:24686 SYN_RECV
tcp 0 3222 125.193.242.25:443 211.91.251.54:64858 LAST_ACK
tcp 0 0 125.193.242.25:37024 182.16.53.42:80 TIME_WAIT
tcp 0 574 125.193.242.25:443 218.92.146.22:55143 LAST_ACK
tcp 0 0 125.193.242.25:80 180.76.196.112:27094 TIME_WAIT
tcp 0 0 103.193.242.29:80 47.92.251.118:34366 TIME_WAIT
tcp 0 0 43.246.212.161:80 212.64.52.114:37716 TIME_WAIT
tcp 0 0 125.193.242.25:443 27.26.128.18:61980 ESTABLISHED
tcp 0 0 125.193.242.25:443 14.116.141.124:58850 TIME_WAIT
tcp 0 0 103.193.242.27:80 47.92.251.118:56254 TIME_WAIT
tcp 0 0 125.193.242.25:443 183.148.229.155:50025 ESTABLISHED
tcp 0 0 103.193.242.27:80 207.148.4.159:40978 TIME_WAIT
tcp 0 0 125.193.242.25:443 125.126.178.149:60483 ESTABLISHED
tcp 0 0 125.193.242.25:443 125.126.176.135:55443 ESTABLISHED
tcp 0 0 43.246.212.162:22 222.186.42.15:45526 ESTABLISHED
tcp 0 0 43.246.212.163:80 106.12.128.249:55510 TIME_WAIT
tcp 0 18346 125.193.242.25:443 117.136.98.145:49839 LAST_ACK
tcp 0 0 103.193.242.27:80 180.76.196.112:43346 TIME_WAIT
tcp 0 0 125.193.242.25:37040 182.16.53.42:80 ESTABLISHED
tcp 0 0 125.193.242.25:443 117.152.17.126:49965 TIME_WAIT
tcp 0 0 125.193.242.25:80 115.159.200.27:37428 TIME_WAIT
tcp 0 1774 125.193.242.25:443 183.237.61.33:56387 LAST_ACK
tcp 0 0 125.193.242.25:443 14.215.176.15:60893 ESTABLISHED
tcp 0 1774 125.193.242.25:443 112.47.27.129:52761 LAST_ACK
tcp 0 0 125.193.242.25:443 223.104.1.250:64177 ESTABLISHED
tcp 0 0 43.246.212.163:22 222.186.42.15:14784 ESTABLISHED
tcp 0 11872 125.193.242.25:22 110.184.220.42:36356 ESTABLISHED
....
tcp 0 0 103.200.32.189:80 106.12.128.249:49236 TIME_WAIT
tcp 0 0 125.193.242.25:443 46.229.168.161:19440 ESTABLISHED
tcp 0 0 125.193.242.25:80 111.30.142.78:63381 TIME_WAIT
tcp 0 0 125.193.242.25:443 223.72.47.181:65054 TIME_WAIT
tcp 0 0 125.193.242.25:443 183.148.229.155:50001 ESTABLISHED
tcp 0 0 125.193.242.25:443 223.104.1.250:64190 ESTABLISHED
tcp 0 0 125.193.242.25:443 125.126.178.149:60494 ESTABLISHED
tcp 0 0 125.193.242.25:443 46.229.168.149:42566 TIME_WAIT
tcp 0 0 43.246.212.162:80 106.12.128.249:59208 TIME_WAIT
tcp 0 0 103.193.242.26:80 180.76.196.213:26994 TIME_WAIT
tcp 0 1774 125.193.242.25:443 122.228.230.81:52112 LAST_ACK
tcp 0 0 125.193.242.25:443 110.249.202.80:63522 TIME_WAIT
tcp 0 0 125.193.242.25:443 59.54.204.125:37715 TIME_WAIT
tcp 0 0 125.193.242.25:443 125.126.176.135:55485 ESTABLISHED
tcp 0 0 125.193.242.25:443 223.104.91.136:57312 TIME_WAIT
tcp 0 0 125.193.242.25:80 183.237.61.32:62939 TIME_WAIT
tcp 0 0 125.193.242.25:443 218.67.19.234:43372 TIME_WAIT
tcp 0 0 43.246.212.164:80 106.13.6.247:44332 TIME_WAIT
tcp 0 0 125.193.242.25:443 223.104.64.244:53446 TIME_WAIT
tcp 0 0 103.193.242.26:80 115.159.206.130:41058 TIME_WAIT
tcp 0 0 125.193.242.25:443 46.229.168.136:11308 ESTABLISHED
tcp 0 3520 125.193.242.25:443 223.95.183.152:50486 LAST_ACK
tcp 0 1615 125.193.242.25:443 36.105.156.55:64978 LAST_ACK
tcp 0 0 103.193.242.28:80 45.32.198.211:32882 TIME_WAIT
tcp 0 0 125.193.242.25:443 223.104.1.226:64156 ESTABLISHED
tcp 0 0 43.246.212.165:80 95.179.196.83:43996 TIME_WAIT
tcp 0 0 125.193.242.25:37034 182.16.53.42:80 TIME_WAIT
tcp 0 0 125.193.242.25:443 110.249.201.243:60265 ESTABLISHED
tcp 0 3222 125.193.242.25:443 112.132.154.143:50367 LAST_ACK
tcp 0 1 125.193.242.25:443 117.136.98.145:49829 LAST_ACK
tcp 0 0 125.193.242.25:443 110.249.201.48:50443 TIME_WAIT
tcp 1 32 125.193.242.25:443 219.133.46.86:49364 CLOSING
tcp 0 4498 125.193.242.25:443 183.148.229.155:49989 LAST_ACK
tcp 0 0 43.246.212.164:80 180.76.196.213:33820 TIME_WAIT
tcp 0 0 103.193.242.26:443 117.183.234.104:54278 ESTABLISHED
tcp 0 1890 103.200.32.189:443 223.96.79.87:58711 FIN_WAIT1
tcp 0 0 125.193.242.25:42208 154.222.136.152:80 ESTABLISHED
tcp 0 0 103.193.242.26:80 111.231.92.94:38480 TIME_WAIT
tcp 0 21685 125.193.242.25:443 125.126.176.135:55435 LAST_ACK
tcp 1 32 125.193.242.25:443 219.133.46.52:60816 CLOSING
tcp 0 0 125.193.242.25:443 113.100.245.181:60398 ESTABLISHED
tcp 0 0 125.193.242.25:443 157.255.192.119:53831 ESTABLISHED
tcp 0 259 125.193.242.25:443 36.159.127.146:52696 LAST_ACK
tcp 0 0 125.193.242.25:443 106.17.1.88:54835 ESTABLISHED
tcp 0 0 125.193.242.25:80 120.87.127.125:61177 ESTABLISHED
tcp 0 0 125.193.242.25:443 117.136.98.145:49801 ESTABLISHED
tcp 0 1 125.193.242.25:443 171.108.233.172:63003 LAST_ACK
tcp 0 574 125.193.242.25:443 183.237.146.16:50081 LAST_ACK
tcp 0 0 103.193.242.29:80 106.12.128.249:39778 TIME_WAIT
tcp 0 31857 125.193.242.25:443 116.11.88.113:22111 LAST_ACK
tcp 0 0 125.193.242.25:443 121.32.181.69:61554 TIME_WAIT
tcp 0 0 125.193.242.25:443 117.181.180.255:60736 ESTABLISHED
tcp 1 32 125.193.242.25:443 14.116.141.124:58826 CLOSING
tcp 0 3210 103.200.32.189:443 218.92.146.22:53004 LAST_ACK
tcp 0 0 125.193.242.25:443 36.105.156.55:65018 ESTABLISHED
tcp 0 0 125.193.242.25:37020 182.16.53.42:80 TIME_WAIT
tcp 0 0 125.193.242.25:80 132.232.138.233:58279 TIME_WAIT
tcp 0 19760 125.193.242.25:443 117.136.98.145:49838 LAST_ACK
tcp 0 0 125.193.242.25:443 183.148.229.155:49991 ESTABLISHED
tcp 0 0 125.193.242.25:443 46.229.168.146:58580 TIME_WAIT
tcp 0 0 125.193.242.25:443 14.116.141.124:58833 ESTABLISHED
tcp 1 32 125.193.242.25:443 14.116.141.124:58874 CLOSING
tcp 0 0 103.193.242.29:80 95.179.196.83:40760 TIME_WAIT
tcp 0 0 43.246.212.163:80 207.148.4.159:40032 TIME_WAIT
tcp 0 0 125.193.242.25:80 106.12.128.249:49248 TIME_WAIT
tcp 0 0 125.193.242.25:443 183.39.54.85:58522 TIME_WAIT
tcp 0 0 125.193.242.25:443 36.105.156.55:65009 ESTABLISHED
tcp 0 574 103.200.32.189:443 220.194.216.34:61884 FIN_WAIT1
tcp 0 0 125.193.242.25:80 111.30.142.252:63213 TIME_WAIT
tcp 0 0 125.193.242.25:80 118.126.98.25:55889 TIME_WAIT
tcp 0 0 125.193.242.25:443 58.63.99.47:53508 ESTABLISHED
tcp 0 0 125.193.242.25:443 223.72.71.102:62361 TIME_WAIT
tcp 0 21515 125.193.242.25:443 36.105.156.55:64992 LAST_ACK
tcp 0 0 125.193.242.25:443 120.231.144.185:60946 ESTABLISHED
tcp 1 32 125.193.242.25:443 219.133.46.48:54554 CLOSING
tcp 0 0 125.193.242.25:443 171.108.148.221:60383 TIME_WAIT
tcp 0 1805 125.193.242.25:443 46.229.168.149:23778 FIN_WAIT1
tcp 0 2112 103.193.242.26:443 202.104.220.107:57949 LAST_ACK
tcp 0 0 43.246.212.161:22 222.186.42.163:13216 ESTABLISHED
tcp 0 0 125.193.242.25:443 112.97.49.46:57784 TIME_WAIT
tcp 0 0 125.193.242.25:443 183.166.137.210:46073 ESTABLISHED
tcp 0 0 125.193.242.25:37036 182.16.53.42:80 ESTABLISHED
tcp 0 0 103.193.242.26:80 118.126.98.25:65450 TIME_WAIT
tcp 0 0 103.193.242.28:80 106.13.6.247:39608 TIME_WAIT
tcp 0 0 103.193.242.27:80 95.179.196.83:55736 TIME_WAIT
tcp 0 0 125.193.242.25:443 112.97.55.50:50886 ESTABLISHED
tcp 0 0 103.193.242.26:80 106.13.6.247:60720 TIME_WAIT
tcp 0 0 125.193.242.25:37038 182.16.53.42:80 ESTABLISHED
tcp 0 0 125.193.242.25:443 58.63.99.47:53546 TIME_WAIT
tcp 0 874 125.193.242.25:443 58.208.138.151:54061 LAST_ACK
tcp 0 0 103.200.32.188:443 117.183.12.158:49921 ESTABLISHED
tcp 0 0 125.193.242.25:443 183.148.229.155:50035 ESTABLISHED
tcp 0 0 125.193.242.25:443 223.104.45.80:49793 TIME_WAIT
tcp 0 0 125.193.242.25:443 171.110.14.63:62844 ESTABLISHED
tcp 0 0 125.193.242.25:443 183.148.229.155:50019 ESTABLISHED
tcp 0 3560 125.193.242.25:443 36.159.127.146:52730 LAST_ACK
tcp 0 0 125.193.242.25:443 125.126.176.135:55451 ESTABLISHED
tcp 0 0 125.193.242.25:443 223.104.63.49:52221 ESTABLISHED
tcp 0 0 125.193.242.25:443 120.87.127.125:62151 ESTABLISHED
tcp 0 18990 125.193.242.25:443 223.72.47.181:65064 ESTABLISHED
tcp 0 1750 103.200.32.187:443 124.239.182.169:60647 LAST_ACK
....
tcp 0 2112 125.193.242.25:443 119.36.209.52:59196 LAST_ACK
tcp 0 24782 125.193.242.25:443 223.72.71.102:62364 ESTABLISHED
...
tcp 0 0 43.246.212.162:80 47.92.251.118:56966 TIME_WAIT
tcp 0 0 125.193.242.25:443 113.220.34.51:55458 ESTABLISHED
tcp 0 10090 125.193.242.25:443 36.105.156.55:65007 ESTABLISHED
tcp 0 574 125.193.242.25:443 114.112.160.36:52394 LAST_ACK
tcp 0 0 125.193.242.25:443 36.159.127.145:59825 ESTABLISHED
tcp 0 0 125.193.242.25:443 112.97.240.252:49714 TIME_WAIT
tcp 0 574 103.200.32.188:443 220.194.216.34:51137 FIN_WAIT1
tcp 0 0 103.193.242.26:80 212.64.52.114:44344 TIME_WAIT
tcp 1 32 125.193.242.25:443 113.100.245.181:60360 CLOSING
...
tcp 0 0 103.193.242.28:80 180.76.196.213:37246 TIME_WAIT
tcp 0 0 125.193.242.25:443 117.181.249.48:63118 ESTABLISHED
tcp 0 160 125.193.242.25:443 117.136.40.154:40454 ESTABLISHED
tcp 0 0 103.193.242.28:80 212.64.52.114:46798 TIME_WAIT
tcp 0 0 125.193.242.25:443 14.28.39.88:56845 ESTABLISHED
tcp 0 0 125.193.242.25:443 36.105.156.55:65015 ESTABLISHED
tcp 0 3222 125.193.242.25:443 117.187.46.21:56430 LAST_ACK
tcp 0 0 :::3311 :::* LISTEN
tcp 0 0 :::80 :::* LISTEN
tcp 0 0 :::22 :::* LISTEN
tcp 0 0 ::1:25 :::* LISTEN
tcp 0 0 :::443 :::* LISTEN
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] STREAM LISTENING 788359 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788361 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788363 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788365 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788367 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788369 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 788371 /vhs/kangle/kangle.manage
unix 2 [ ACC ] STREAM LISTENING 12871 public/cleanup
unix 2 [ ACC ] STREAM LISTENING 12878 private/tlsmgr
unix 2 [ ACC ] STREAM LISTENING 12882 private/rewrite
unix 2 [ ACC ] STREAM LISTENING 12886 private/bounce
unix 2 [ ACC ] STREAM LISTENING 12890 private/defer
unix 2 [ ACC ] STREAM LISTENING 12894 private/trace
unix 2 [ ACC ] STREAM LISTENING 12898 private/verify
unix 2 [ ACC ] STREAM LISTENING 12902 public/flush
unix 2 [ ACC ] STREAM LISTENING 12906 private/proxymap
unix 2 [ ACC ] STREAM LISTENING 12910 private/proxywrite
unix 2 [ ACC ] STREAM LISTENING 12914 private/smtp
unix 2 [ ACC ] STREAM LISTENING 12918 private/relay
unix 2 [ ACC ] STREAM LISTENING 12922 public/showq
unix 2 [ ACC ] STREAM LISTENING 9353 @/com/ubuntu/upstart
unix 2 [ ACC ] STREAM LISTENING 12926 private/error
unix 2 [ ACC ] STREAM LISTENING 12930 private/retry
unix 2 [ ACC ] STREAM LISTENING 12934 private/discard
unix 2 [ ACC ] STREAM LISTENING 12938 private/local
unix 2 [ ACC ] STREAM LISTENING 12942 private/virtual
unix 2 [ ACC ] STREAM LISTENING 12946 private/lmtp
unix 2 [ ACC ] STREAM LISTENING 12950 private/anvil
unix 2 [ ACC ] STREAM LISTENING 12954 private/scache
unix 12 [ ] DGRAM 12433 /dev/log
unix 2 [ ] DGRAM 10235 @/org/kernel/udev/udevd
unix 2 [ ACC ] STREAM LISTENING 788373 /vhs/kangle/kangle.manage
unix 2 [ ] DGRAM 9194897
unix 3 [ ] STREAM CONNECTED 9194890
unix 3 [ ] STREAM CONNECTED 9194889
unix 2 [ ] DGRAM 9194866
unix 3 [ ] STREAM CONNECTED 9194859
unix 3 [ ] STREAM CONNECTED 9194858
unix 2 [ ] DGRAM 9154579
unix 2 [ ] DGRAM 9131277
unix 2 [ ] DGRAM 8064393
unix 2 [ ] DGRAM 165319
unix 2 [ ] DGRAM 19506
unix 2 [ ] DGRAM 12997
unix 2 [ ] DGRAM 12961
unix 3 [ ] STREAM CONNECTED 12957
unix 3 [ ] STREAM CONNECTED 12956
unix 3 [ ] STREAM CONNECTED 12953
unix 3 [ ] STREAM CONNECTED 12952
unix 3 [ ] STREAM CONNECTED 12949
unix 3 [ ] STREAM CONNECTED 12948
unix 3 [ ] STREAM CONNECTED 12945
unix 3 [ ] STREAM CONNECTED 12944
unix 3 [ ] STREAM CONNECTED 12941
unix 3 [ ] STREAM CONNECTED 12940
unix 3 [ ] STREAM CONNECTED 12937
unix 3 [ ] STREAM CONNECTED 12936
unix 3 [ ] STREAM CONNECTED 12933
unix 3 [ ] STREAM CONNECTED 12932
unix 3 [ ] STREAM CONNECTED 12929
unix 3 [ ] STREAM CONNECTED 12928
unix 3 [ ] STREAM CONNECTED 12925
unix 3 [ ] STREAM CONNECTED 12924
unix 3 [ ] STREAM CONNECTED 12921
unix 3 [ ] STREAM CONNECTED 12920
unix 3 [ ] STREAM CONNECTED 12917
unix 3 [ ] STREAM CONNECTED 12916
unix 3 [ ] STREAM CONNECTED 12913
unix 3 [ ] STREAM CONNECTED 12912
unix 3 [ ] STREAM CONNECTED 12909
unix 3 [ ] STREAM CONNECTED 12908
unix 3 [ ] STREAM CONNECTED 12905
unix 3 [ ] STREAM CONNECTED 12904
unix 3 [ ] STREAM CONNECTED 12901
unix 3 [ ] STREAM CONNECTED 12900
unix 3 [ ] STREAM CONNECTED 12897
unix 3 [ ] STREAM CONNECTED 12896
unix 3 [ ] STREAM CONNECTED 12893
unix 3 [ ] STREAM CONNECTED 12892
unix 3 [ ] STREAM CONNECTED 12889
unix 3 [ ] STREAM CONNECTED 12888
unix 3 [ ] STREAM CONNECTED 12885
unix 3 [ ] STREAM CONNECTED 12884
unix 3 [ ] STREAM CONNECTED 12881
unix 3 [ ] STREAM CONNECTED 12880
unix 3 [ ] STREAM CONNECTED 12877
unix 3 [ ] STREAM CONNECTED 12876
unix 3 [ ] STREAM CONNECTED 12874
unix 3 [ ] STREAM CONNECTED 12873
unix 3 [ ] STREAM CONNECTED 12870
unix 3 [ ] STREAM CONNECTED 12869
unix 3 [ ] STREAM CONNECTED 12867
unix 3 [ ] STREAM CONNECTED 12866
unix 2 [ ] DGRAM 12819
unix 3 [ ] STREAM CONNECTED 12393
unix 3 [ ] STREAM CONNECTED 12392
unix 3 [ ] DGRAM 10254
unix 3 [ ] DGRAM 10253
我有一些问题：
- 你看有很多状态
SYN_RECV，这正常吗？ - 你看到有很多Send-Q有数据包的TCP连接，这是异常吗？为什么会造成这个？
答案1
SYN_RECV：如果它们长时间保持这种状态，那么无论在 :443 上侦听什么都不再接受（）连接。即服务器不对传入连接执行accept()。如果那是一个 Web 服务器，那么这可能是正常的，因为它已经最大化了它愿意并行服务的连接数量，而剩下的则处于等待状态。
Send-Q：这意味着服务器已经将尚未发送或尚未被远程端确认的数据写入套接字，因此内核必须记住它们。
在大多数情况下，当连接正在传输数据并且您的数字看起来足够小时，这是正常的。由于这是一个 CDN 节点，它也可能是由于客户端丢失（例如失去网络连接）而导致的，其中服务器尚未发现这一点并且内核正在等待 TCP ACK 返回。
您可以启用 tcp keepalive 并减少服务器的超时来缓解该问题。