nanog mailing list archives
Re: botted hosts
From: "Sam Hayes Merritt, III" <sam () themerritts org>
Date: Mon, 4 Apr 2005 15:56:10 -0500 (CDT)
Unblocking on customer request is an expensive operation, for both the ISP and the customer.
And they frequently assume that network operations changes are free---Comcast reported that it would cost $58 million to implement port 25 blocking and notify customers, just for Comcast.
Anyone can come up with a number to convince themselves that they don't need to do the 'right thing'. Comcast is probably using Docsis. Docsis makes applying filters on a per user basis pretty darn easy.
AOL blocks outbound 25.Earthlink for the most part does (we only refused 148 emails from them yesterday from places like user-0c2i2vr.cable.earthlink.net and user-0c2if7q.cable.earthlink.net, they might block port 25 by fefault for as much as I know)
We block outbound port 25 on our residential connections by default. Of those, only 2.4% currently have requested that we not filter them.
The $ excuse just doesn't fly. RR and Comcast know this. Other providers have tackled the problem. I've seen the Spamcop reports on our retail connections drop to just about nothing since filtering our users.
On a deeper level, I discovered (its not at proof level, but probably at 'strong conjecture' level) that results from information theory show that spam cannot be stopped technically.
Yep. Cannot be stopped. But if I disable what I am currently doing to keep the rest of the world out, my users damn sure notice. I do what I can, grab the low lying fruit, get them knocked out of the way and then go for the harder problems.
sam
Current thread:
- Re: The power of default configurations, (continued)
- Re: The power of default configurations Mark Andrews (Apr 06)
- Re: botted hosts Suresh Ramasubramanian (Apr 04)
- Re: botted hosts Christopher L. Morrow (Apr 04)
- Re: botted hosts Dean Anderson (Apr 04)
- Message not available
- Re: botted hosts John Dupuy (Apr 04)
- Message not available
- Re: botted hosts John Dupuy (Apr 04)
- Re: botted hosts Valdis . Kletnieks (Apr 04)
- Re: botted hosts Christopher L. Morrow (Apr 04)
- Message not available
- Re: botted hosts Dean Anderson (Apr 05)
- Re: botted hosts Simon Waters (Apr 05)
- Re: botted hosts Dean Anderson (Apr 05)
- Re: botted hosts Suresh Ramasubramanian (Apr 05)
- Re: botted hosts Tony Finch (Apr 05)
- Re: botted hosts Suresh Ramasubramanian (Apr 05)
- Re: botted hosts Florian Weimer (Apr 04)