[TriLUG] linksys linux router question

[jonc at nc.rr.com]

New Firmware.

Personally, I like to use upper level ports (and redirect them to the
proper ports internally) for common services like SMTP and SSH. This
by-passess most of the crufty auto-scannering bots that are out there.
  port 7735 ==> 25 internal machine 192.168.1.11
  port 7832 ==> 22 internal machine 192.168.1.11

Then you can simply do a check from your internal box and drop the
connection if it is not from an approved range.

Jon


----- Original Message -----
From: Ralph Blach <rcblach at blach.dnsalias.org>
Date: Monday, July 24, 2006 7:17 am
Subject: [TriLUG] linksys linux router question
To: trilug at trilug.org

> I have a linksys linux router and  has everthing all the function I 
> want 
> almost.
> 
> What is does not seem to have is the ability to drop connection on 
> a 
> port if it does not come from a specific range of address.
> 
> Specifically , I would like to forward sendmail and and sshd only 
> if 
> they come from specific address ranges.
> 
> Is there any way to do this using the linksys firmware or do I have 
> to 
> load a new firmware.
> 
> Any ideas would be appreciated.
> 
> Chip
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