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 From:  "D. Archibald Smart" <dasmart at gmail dot com>
 To:  Jeffrey Goldberg <jeffrey at goldmark dot org>
 Cc:  Monowall Mailing List <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] Odd NAT blocking
 Date:  Tue, 5 Oct 2004 18:29:10 -0400
im in the exact same boat. im using mail.app under osx to read imaps
(port993) mail. i see these logs occasionally as well. im not sure if
its a mail.app thing or a m0n0wall thing.

das



On Tue, 5 Oct 2004 12:07:56 -0700, Jeffrey Goldberg
<jeffrey at goldmark dot org> wrote:
> This question might reflect my misunderstanding of how NAT works.
> (Well, considering that I think it works by magic, I suppose that that
> is inevitable that I misunderstand.)
> 
> I am getting some outgoing packets occasionally blocked that should be
> allow through.  Here is an example log entry (line broken for
> readability)
> 
> ipmon[75]: 11:07:08.443851 sis0 @0:15 b
>    192.168.1.51,63864 -> 66.111.4.160,993 PR tcp len 20 101 -AFP IN
> 
> I am not having any user experienced difficulties with reaching port
> 993 on that remote host from inside my LAN at 192.168.1.51.  It seems
> that only the occasional packet is blocked.
> 
> I haven't been able to check systematically (syslogd on OS X sucks),
> but my impression is that this is only happening with IMAP and IMAPs.
> 
> The only outgoing rules I have are to block ports 137-139,
> 
> Any insight into this would be welcome.  Also I'd like to get
> recommendations for good books on packet filtering firewalls including
> NAT.
> 
> Cheers,
> 
> -j
> 
> --
> Jeffrey Goldberg                        http://www.goldmark.org/jeff/
> 
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