From owner-freebsd-net@freebsd.org  Fri Jan 20 20:48:54 2017
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From: "Kristof Provost" <kp@FreeBSD.org>
To: "Bakul Shah" <bakul@bitblocks.com>
Cc: "Alan Somers" <asomers@freebsd.org>,
 "FreeBSD Net" <freebsd-net@freebsd.org>
Subject: Re: pf & NAT issue
Date: Fri, 20 Jan 2017 21:48:51 +0100
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On 20 Jan 2017, at 21:31, Bakul Shah wrote:
> $ pfctl -s info
> Status: Enabled for 167 days 13:40:11         Debug: Urgent
>
> State Table                          Total             Rate
>   current entries                        0
>   searches                      2870986757          198.3/s # this 
> seems high...
>   inserts                          3428240            0.2/s
>   removals                         3428240            0.2/s
> Counters
>   match                         1482741914          102.4/s
>   bad-offset                             0            0.0/s
>   fragment                               1            0.0/s
>   short                                  0            0.0/s
>   normalize                              0            0.0/s
>   memory                                 0            0.0/s
>   bad-timestamp                          0            0.0/s
>   congestion                             0            0.0/s
>   ip-option                             31            0.0/s
>   proto-cksum                            0            0.0/s
>   state-mismatch                     28931            0.0/s

You gave a decent number of state-mismatch errors here.
It’s worth checking if that number increments whenever you see a 
dropped NAT connection.

Regards,
Kristof