Groups > comp.os.linux.networking > #2019

Re: Dropping connection attempts to port 25

From	Joe Beanfish <joebeanfish@nospam.duh>
Newsgroups	comp.os.linux.networking
Subject	Re: Dropping connection attempts to port 25
Date	2013-03-12 13:21 +0000
Organization	A noiseless patient Spider
Message-ID	<khna4t$juu$1@dont-email.me> (permalink)
References	<khkqrs$msg$1@news.albasani.net>

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On Mon, 11 Mar 2013 14:48:29 +0000, Clark Smith wrote:

> Somebody keeps trying to connect to my sendmail server, without success,
> but filling my logs in the process. Since, according to the sendmail
> logs, the connection seems to be coming from a specific IP address <ip>,
> I added the following IPTables rules:
> 
> 	iptables -A INPUT -s <ip> -j DROP iptables -A OUTPUT -d <ip> -j 
DROP
> 
> However, I can still see further connection attempts in the sendmail
> logs.
> 
> 	Any ideas on how to get IPTables to drop such attempts before
> they get to sendmail?

Try -I instead of -A to ensure your new rule is first and not circumvented
by some later rule.

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Thread

Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 14:48 +0000
  Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-11 14:58 +0000
    Re: Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 15:12 +0000
      Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-11 16:24 +0000
      Re: Dropping connection attempts to port 25 Octothorpe <Octothorpe@invalid.com> - 2013-03-11 16:38 -0400
        Re: Dropping connection attempts to port 25 Richard Kettlewell <rjk@greenend.org.uk> - 2013-03-12 10:16 +0000
  Re: Dropping connection attempts to port 25 Dale Dellutri <ddelQQQlutr@panQQQix.com> - 2013-03-11 14:58 +0000
    Re: Dropping connection attempts to port 25 Clark Smith <noaddress@nowhere.net> - 2013-03-11 15:15 +0000
  Re: Dropping connection attempts to port 25 David Hough <noone$$@llondel.org> - 2013-03-12 07:29 +0000
  Re: Dropping connection attempts to port 25 Joe Beanfish <joebeanfish@nospam.duh> - 2013-03-12 13:21 +0000

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