nanog mailing list archives
Re: Stealth Blocking
From: "Eric A. Hall" <ehall () ehsco com>
Date: Thu, 24 May 2001 09:46:19 -0700
Returning to operational traffic:
One thing that I think *will* help, particularly in the short term, is port 25 blocking of dialup ports. It's my personal opinion that this will have the greatest impact on spammers who abuse open relays. I've watched this happen over the last few months, as various large networks have secured their dialup ports. It's impressive.
TCP rate-limiting on outbound traffic to *:25 would also be extremely effective, particularly on unclassified customer traffic, and without the heavy-handed nature of denying all dial-up traffic. Rate-limiting doesn't interfere with low-volume legitimate mail, but it really cramps spam. -- Eric A. Hall http://www.ehsco.com/ Internet Core Protocols http://www.oreilly.com/catalog/coreprot/
Current thread:
- RE: Stealth Blocking, (continued)
- RE: Stealth Blocking Roeland Meyer (May 23)
- RE: Stealth Blocking David Schwartz (May 23)
- Re: Stealth Blocking Shawn McMahon (May 24)
- RE: Stealth Blocking Roeland Meyer (May 23)
- Re: Stealth Blocking Christopher B. Zydel (May 23)
- RE: Stealth Blocking Roeland Meyer (May 23)
- RE: Stealth Blocking David Schwartz (May 23)
- Re: Stealth Blocking Richard A. Steenbergen (May 23)
- RE: Stealth Blocking Roeland Meyer (May 23)
- Re: Stealth Blocking Dave Rand (May 24)
- Re: Stealth Blocking Eric A. Hall (May 24)
- Re: Stealth Blocking Valdis . Kletnieks (May 24)
- Re: Stealth Blocking Eric A. Hall (May 24)
- Re: Stealth Blocking Shawn McMahon (May 24)
- Re: Stealth Blocking Steve Sobol (May 24)
- Re: Stealth Blocking Shawn McMahon (May 24)
- Re: Stealth Blocking Eric A. Hall (May 24)
- RE: Stealth Blocking Roeland Meyer (May 23)
- RE: Stealth Blocking Mike Batchelor (May 25)
- Re: Stealth Blocking Jason Slagle (May 24)
- Re: Stealth Blocking Mitch Halmu (May 24)