From owner-freebsd-current  Tue Dec 19 10:51:12 2000
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To: dmaddox@sc.rr.com
Cc: current@FreeBSD.ORG
Subject: Re: Interesting new messages in logs 
In-Reply-To: Message from "Donald J . Maddox" <dmaddox@sc.rr.com> 
   of "Tue, 19 Dec 2000 13:20:57 EST." <20001219132057.A1338@cae88-102-101.sc.rr.com> 
Date: Tue, 19 Dec 2000 13:51:04 -0500
From: Hasan Azam Diwan <diwanh@cs.rpi.edu>
Sender: owner-freebsd-current@FreeBSD.ORG
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To answer your first question, a port need not be open in order to receive 
connections. To answer your second, these appear to be IPv4 addresses 
encapsulated as IPv6 addresses. 
> Dec 19 12:21:04 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP 
> ::0001:25 from ::0001:1286
> Dec 19 12:24:08 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP 
> ::0001:25 from ::0001:1299
> Dec 19 12:27:13 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP 
> ::0001:25 from ::0001:1308
> Dec 19 12:39:28 cae88-102-101 /boot/kernel/kernel: Connection attempt to TCP 
> ::0001:25 from ::0001:1336
> Obviously, this machine is using log_in_vain, and it appears obvious
> that these are local smtp transactions.  It is _not_ obvious, at
> least to me, why they are now being logged as if port 25 was not
> open.  Also, why the odd format in the addresses?


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