FreeBSD 11.1 with Intel(R) PRO/1000 unresponsive to all network interfaces from outside (seems, during idle), but immediately up when ping anything from inside the server

[Eugene Grosbein]

26.03.2018 4:37, supportsobaka at mail.ru wrote:

> It doesn't help, unfortunately. The DC provides rescue system, both Linux and FreeBSD 11.1. I booted to both today
> and keep it idle for several hours and never get lost connection to the server (never kicked out from terminal).
> They also run GENERIC on FreeBSD 11.1.

That's just fine.

> They have sysctl net.link.ether.inet.max_age = 1200, so even higher than default 600. 

No, default is 1200.

> So the confuse now is what's the difference between their and mine FreeBSD 11.1 that I didn't tune much yet. Firewalls disabled.
> 
> Any idea?

That's obviously your tuning then :-) Post it.