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 From:  Melvin Backus <melvin at sleepydragon dot net>
 To:  peter at Closeconsultants dot com, m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] SMTP redirection for wireless hotspot
 Date:  Tue, 09 Nov 2004 23:36:32 -0500
Extremely interested in the details.

At 05:53 AM 11/9/2004, Peter Curran wrote:
>An interesting little project just completed.  The customer manages upmarket
>apartment blocks and provides Internet access via wireless to each 
>apartment.
>I have supplied a m0n0-based 'access controller' using the captive portal
>with radius to manage access, firewalling and some traffic management.
>
>The customer has a problem with some short-term tenants who need to access
>their home ISP mail accounts.  The problem is not reading mail, but sending
>it.  It seems that many ISP's reject relaying from 'foreign' addresses and do
>not offer a POP-before-SMTP type solution to allow their users to send email
>when on the move.
>
>The solution is quite simple - I modified the captive portal rules
>configuration to insert a 'forward' to 127.0.0.1 port 25 for all traffic to
>port 25.  This then runs to a small CLG that makes a new connection to the
>SMTP service of the ISP providing the DSL connection, and then transparently
>copies the data between the two TCP connections.
>
>The solution is based around a simple proxy called tcppm that I found in the
>FreeBSD ports.
>
>If anybody is interested I would be happy to provide the details.
>
>Regards
>
>Peter Curran
>
>
>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Whom computers would destroy, they must first drive mad.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Melvin Backus
Principal Wizard
Sleepy Dragon Enterprises
www.sleepydragon.net