Where do packages go?

Question

FreeBSD

Colleagues, good afternoon
For a long time we had a gateway on FreeBSD 7.
Recently, the hardware failed, we had to change it. At the same time I changed the system to FreeBSD 10.1
From the services are:
PF, dhcprelya, named, ftpproxy, ntpd, zabbix_agent
About a month ago there were disconnections, and only in the morning when there is no load. Internet sites open, but ICQ and Bank customers are constantly falling off from users.
Rebooting the gateway helps - but IMHO this is not an option.
Any advice on where to look?
I rebuilt the kernel with the same parameters as on the previous server. No new services have been added. The configs are also old.
To the question why did not leave 7-ku? It is no longer supported. I want to be in trend

Answer 1

Are there interface errors?
And in general, look at what is there on netstat,
tcpdump, also joke during communication problems.

Answer 2

local loop generates a storm, right?)

Answer 3

if the problem is not constant, but intermittent, there may well be a problem with the dns server, many providers have provider dns set by default, which sometimes "does not work very well", is treated by substituting the Google dns server or equivalent

Answer 4

Just in the morning, there is even a lot of work - everyone comes and starts watching cats in contact.
You have zabbix there - configure traffic monitoring on all interfaces, packet errors, the number of packets per second, the status of all interfaces, and see the monitoring results - will there be traffic dips. You can run pings to several external servers with saving the output to the log (man script) and see if pings fall off at the moments of reconnection of asec and client-banks or not.
"Kilometer firewall logs" is strange. By default, no firewall keeps any logs at all. What firewall? What is his config?
What is the type of internet connection? Pure ethernet, or PPTP/L2TP/PPPoE?