[Mimedefang] validating 'possibly forged' helo IP's?

Kenneth Porter shiva at sewingwitch.com
Sun Jan 15 18:10:48 EST 2006


--On Saturday, January 14, 2006 9:41 PM -0500 James Ebright 
<jebright at esisnet.com> wrote:

> It is trivial to setup PTR records for any size of IP space, you are
> talking about less than 20 lines of shell code for a fairly complex
> setup, can do it in one typed in for loop if you want.... so there really
> is no excuse to not have any PTR records at all.

There's macro syntax in BIND for doing exactly this, and it's what's 
commonly used by the ISP to create the delegation for blocks that don't 
fall on subnet boundaries (AKA "classless delegation"). Look for 
"$GENERATE".

Here's one approach:

<http://homepages.tesco.net/~J.deBoynePollard/FGA/
avoid-rfc-2317-delegation.html>



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