2 deleted 11 characters in body
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On the first host,

root@xxx:~# netstat -natup | grep xxx
tcp        0      0 10.2.5.3:40740      xxx:10051   ESTABLISHED 1482/zabbix_proxy:

we can see that a connection has been established with the remote host.

root@xxx:~# ps -eo uid,pid,etime | grep 1482
      106  1482 18-17:10:17

The connection has been established for what appears to be ~18 days. When I SSH to the remote host and run:

root@gl-zabbix-app1root@xxx:~# netstat -natup | grep 10.2.5.3

there are absolutely no entries at all!

How is this possible?

On the first host,

root@xxx:~# netstat -natup | grep xxx
tcp        0      0 10.2.5.3:40740      xxx:10051   ESTABLISHED 1482/zabbix_proxy:

we can see that a connection has been established with the remote host.

root@xxx:~# ps -eo uid,pid,etime | grep 1482
      106  1482 18-17:10:17

The connection has been established for what appears to be ~18 days. When I SSH to the remote host and run:

root@gl-zabbix-app1:~# netstat -natup | grep 10.2.5.3

there are absolutely no entries at all!

How is this possible?

On the first host,

root@xxx:~# netstat -natup | grep xxx
tcp        0      0 10.2.5.3:40740      xxx:10051   ESTABLISHED 1482/zabbix_proxy:

we can see that a connection has been established with the remote host.

root@xxx:~# ps -eo uid,pid,etime | grep 1482
      106  1482 18-17:10:17

The connection has been established for what appears to be ~18 days. When I SSH to the remote host and run:

root@xxx:~# netstat -natup | grep 10.2.5.3

there are absolutely no entries at all!

How is this possible?

1
source | link

Asymmetric ESTABLISHED session in netstat

On the first host,

root@xxx:~# netstat -natup | grep xxx
tcp        0      0 10.2.5.3:40740      xxx:10051   ESTABLISHED 1482/zabbix_proxy:

we can see that a connection has been established with the remote host.

root@xxx:~# ps -eo uid,pid,etime | grep 1482
      106  1482 18-17:10:17

The connection has been established for what appears to be ~18 days. When I SSH to the remote host and run:

root@gl-zabbix-app1:~# netstat -natup | grep 10.2.5.3

there are absolutely no entries at all!

How is this possible?