nanog mailing list archives
Re: Anti-spam System Idea
From: Sean Donelan <sean () donelan com>
Date: Sun, 15 Feb 2004 17:46:05 -0500 (EST)
On Sun, 15 Feb 2004 Valdis.Kletnieks () vt edu wrote:
DialUp Lists (DUL) dns block lists permits you to ignore e-mail from many dynamic IP addresses. You can configure your mail server to do this today without waiting for ISPs to do anything.If we advertise the DHCP pools for AS1312 in a DUL, we solve the problem for those sites that use the DUL we list them in.
What if I told you about a method to identify the type of connection for every IP address in our DNS? You don't need to rely on third-party DUL lists. Blocking is a binary decision. Instead if you have better information about the connection source, you can make different decisions how to handle the message.
If we block outbound port 25 SYN packets from origin addresses in the DHCP address blocks, we solve the problem for everybody.
Including the people who don't want you to solve it for them. People want to use outbound port 25 from dynamic address blocks. Why block it between people who want to use it just because some people want to have open servers? Block 119, you must use your ISPs NNTP server. Block 6667, you must use your ISPs IRC server Block 80, you must use your ISPs HTTP proxy. Block N, you must use your ISPs whatever server. Enterprises already do this, the equipment exists. Why do we want ISPs doing this?
Current thread:
- RE: Anti-spam System Idea, (continued)
- RE: Anti-spam System Idea Tim Thorpe (Feb 14)
- Re: Anti-spam System Idea Steven Champeon (Feb 14)
- RE: Anti-spam System Idea jlewis (Feb 14)
- RE: Anti-spam System Idea william(at)elan.net (Feb 14)
- Re: Anti-spam System Idea Jon R. Kibler (Feb 15)
- Re: Anti-spam System Idea Sean Donelan (Feb 15)
- Re: Anti-spam System Idea Valdis . Kletnieks (Feb 15)
- Re: Anti-spam System Idea jlewis (Feb 15)
- Re: Anti-spam System Idea Jon R. Kibler (Feb 15)
- Re: Anti-spam System Idea Daniel Reed (Feb 16)
- RE: Anti-spam System Idea Tim Thorpe (Feb 14)
- Re: Anti-spam System Idea Sean Donelan (Feb 15)
- Re: Anti-spam System Idea Valdis . Kletnieks (Feb 15)
- Identifying IP address types Sean Donelan (Feb 15)
- Re: Anti-spam System Idea Jon R. Kibler (Feb 15)
- Re: Anti-spam System Idea Sean Donelan (Feb 15)
- Re: Anti-spam System Idea Jon R. Kibler (Feb 15)
- Re: Anti-spam System Idea Christopher L. Morrow (Feb 15)
- Re: Anti-spam System Idea Jon R. Kibler (Feb 16)
- Re: Anti-spam System Idea Christopher L. Morrow (Feb 16)
- Re: Anti-spam System Idea J Bacher (Feb 16)
- RE: Anti-spam System Idea Timothy R. McKee (Feb 16)