これは125.193.242.25CDN ノードであり、TCP 接続を分析すると次のようになります。
[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
質問がいくつかあります：
- 状態がいろいろありますが、
SYN_RECVこれは正常ですか？ - TCP接続では、Send-Qパケットがたくさん見えます。これは異常なのでしょうか？なぜこれが起こるのですか？
答え1
SYN_RECV：長い間この状態を維持すると、：443を受信したすべてのエントリはもはや接続を許可しません。つまり、サーバーは着信接続に対してaccept（）を実行しません。それがWebサーバーであれば、並列に提供したい接続数を最大化し、残りは待機状態にしたため、おそらく正常です。
Send-Q：これは、サーバーがリモート側で送信または承認されていないデータをソケットに書き込んだことを意味するため、カーネルはこれを覚えておく必要があります。
ほとんどの場合、接続がデータを転送していて数字が十分に小さく見える場合、これは通常の現象です。これはCDNノードであるため、サーバーがまだそれを検出しておらず、カーネルがTCP ACKが戻るのを待っているクライアントの損失（ネットワーク接続の損失など）が原因で発生する可能性があります。
tcp keepaliveを有効にしてサーバーのタイムアウトを減らすことで問題を軽減できます。