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Re: Providers removing blocks on port 135?

  • From: Owen DeLong
  • Date: Sat Sep 20 18:07:32 2003

However, I'm not convinced blocking port 25 on dialups helps much with that.
What it does help with is preventing them from connecting to open relays.
The real solution in the long run will be two-fold:

1. Internet hosts need to become less penetrable. (or at least
one particular brand of software)

2. SMTP AUTH will need to become more widespread and end-to-endish.

Owen


--On Saturday, September 20, 2003 4:53 PM -0500 Rob Thomas <[email protected]> wrote:

Hi, NANOGers.

] I still disagree with this.  To prevent SPAM, people shouldn't run open
] relays and the open relay problem should be solved.  Breaking legitimate
] port 25 traffic is a temporary hack.

I suspect that most spam avoids open relays.  The abuse of
proxies, routers, and bots for this purpose is far more in
vogue.  Watch out for worms such as W32.Sanper, which also
provide a built-in spam relay network.  Remove all of the
open mail relays and you are left with...lots of spam.

More at NANOG...  ;)

Thanks,
Rob.
--
Rob Thomas
http://www.cymru.com
ASSERT(coffee != empty);