From owner-freebsd-pf@freebsd.org  Mon Jun 11 22:23:45 2018
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From: "Kristof Provost" <kristof@sigsegv.be>
To: "Fatemeh Mehdizadeh" <mehdizadeh.fatemeh@gmail.com>
Cc: freebsd-pf@freebsd.org
Subject: Re: pf nat log does not show source and destination port
Date: Mon, 11 Jun 2018 18:23:33 -0400
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Hi Fatemeh,

On 11 Jun 2018, at 7:51, Fatemeh Mehdizadeh wrote:
> Hi all,
> I'm using pf to create nat. I'm on FreeBSD9.2.
Note that FreeBSD 9.2 is not a supported version. It went out of support 
at the end of 2014.
(See https://www.freebsd.org/security/unsupported.html)

I would strongly recommend upgrading to a supported version:
https://www.freebsd.org/security/security.html#sup

> I want enable logs for
> nat translations, so
> in pf.cpnf:
>
> table <mytable> { 20.20.20.2,20.20.20.3,20.20.20.4,20.20.20.5 }
> nat log on 'eth0' from { 10.10.10.0/24} to any -> <mytable>
> round-robin sticky-address
>
> After ping request I have a log:
> # tcpdump -t -r pflog
> IP 20.20.20.3 > 20.20.20.1: ICMP echo request, id 4147, seq 0, length 
> 64
>
pflog logs the entire packet (with a pf-specific header with information 
about the matched rules), so you can parse whatever information you want 
out of that.

> The problem is that I want my log shows the source port and
> destination port and NOT show id, seq and length.
>
You may get enough information by simply telling tcpdump to be more 
verbose:
# tcpdump -t -v -r pflog

(Repeat the ‘-v’ flag for even more information.)

Regards,
Kristof