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Tien Dung Tran avatar Ubuntu

tcp6 timewait is consistently higher after upgraded from Ubuntu 18.04 to 22.04

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Tien Dung Tran

Our service just migrated from Ubuntu 18.04 to 22.04 instance. But we found out that TCP6 connection with time_wait state increased significantly, in Ubuntu 22.04 they are around ~200 connections, while 18.04 only around ~30. The IPv6 already disabled. Below is result of netstat -on | grep TIME_WAIT | grep tcp

tcp6       0      0 104.10.69.125:8088       104.10.87.104:3512       TIME_WAIT   timewait (18.39/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.87.104:14494      TIME_WAIT   timewait (58.43/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:29500      TIME_WAIT   timewait (28.30/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:31354      TIME_WAIT   timewait (22.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:4158        TIME_WAIT   timewait (1.85/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:30044      TIME_WAIT   timewait (58.36/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:36746      TIME_WAIT   timewait (42.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:31398      TIME_WAIT   timewait (52.75/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.87.104:49504      TIME_WAIT   timewait (8.38/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:8924       TIME_WAIT   timewait (58.33/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:47232      TIME_WAIT   timewait (32.74/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:58356      TIME_WAIT   timewait (18.29/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:42082         TIME_WAIT   timewait (25.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:12178      TIME_WAIT   timewait (38.31/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:58998         TIME_WAIT   timewait (0.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:33574      TIME_WAIT   timewait (8.28/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:39322      TIME_WAIT   timewait (38.34/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:31632         TIME_WAIT   timewait (30.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:43194       TIME_WAIT   timewait (31.85/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:61360       TIME_WAIT   timewait (21.85/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:60894       TIME_WAIT   timewait (41.85/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:48172      TIME_WAIT   timewait (8.31/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:57174      TIME_WAIT   timewait (18.32/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:59010         TIME_WAIT   timewait (5.12/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:43366         TIME_WAIT   timewait (55.13/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:1208       TIME_WAIT   timewait (12.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:33986      TIME_WAIT   timewait (22.74/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:42310         TIME_WAIT   timewait (10.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:26018      TIME_WAIT   timewait (48.36/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:54292       TIME_WAIT   timewait (11.85/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.87.104:42020      TIME_WAIT   timewait (48.42/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:17216      TIME_WAIT   timewait (52.41/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:33712      TIME_WAIT   timewait (32.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.87.104:50312      TIME_WAIT   timewait (28.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:55560      TIME_WAIT   timewait (2.74/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.161:42136      TIME_WAIT   timewait (2.40/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:6392       TIME_WAIT   timewait (42.75/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.87.104:10380      TIME_WAIT   timewait (38.41/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:31644         TIME_WAIT   timewait (35.12/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:54026         TIME_WAIT   timewait (45.12/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:42314         TIME_WAIT   timewait (15.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.88.42:13068       TIME_WAIT   timewait (51.85/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:54014         TIME_WAIT   timewait (40.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.89.249:21674      TIME_WAIT   timewait (28.33/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.91.211:22168      TIME_WAIT   timewait (48.32/0/0)
tcp6       0      0 127.0.0.1:8088          127.0.0.1:42070         TIME_WAIT   timewait (20.12/0/0)
tcp6       0      0 104.10.69.125:8088       104.10.86.112:29806      TIME_WAIT   timewait (12.74/0/0)

is there something wrong or what might causing this issue.

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