nanog mailing list archives
Re: Anti-spam System Idea
From: Niels Bakker <niels=nanog () bakker net>
Date: Mon, 16 Feb 2004 17:08:39 +0100
* baldwinL () mynetwatchman com (Lawrence Baldwin) [Mon 16 Feb 2004, 16:17 CET]:
DHCP, though technically dynamic addressing is far less of a problem as IP address do NOT typically change very often...remember DHCP leases are renewed automatically by the client when the lease is 50% to expiration. Many DHCP clients also cache their previously leased IP (e.g. Windows) and explicitly request the same IP even across lease expirations... depending on the service provider, DHCP clients often maintain the same IP for months at a time (aka "sticky IP"). Some PPPoE gateways also maintain username to IP caches so sticky IPs can also result in that scenario as well.
Some ISPs configure their systems to hand out different IP addresses, to discourage people from running servers (they'd have to update www.theirdomain.tld each time their address would change). This practice gave dynamic dns services the opportunity to fill a need with consumers. -- Niels. -- Blessed are the Watchmakers, for they shall inherit the earth.
Current thread:
- Spam issue discussion lists [was Re: Anti-spam System Idea], (continued)
- Spam issue discussion lists [was Re: Anti-spam System Idea] Mark Jones (Feb 16)
- RE: Anti-spam System Idea Tim Thorpe (Feb 14)
- Re: Anti-spam System Idea Petri Helenius (Feb 14)
- Re: Anti-spam System Idea W.D.McKinney (Feb 14)
- RE: Anti-spam System Idea Tim Thorpe (Feb 14)
- Re: Anti-spam System Idea Valdis . Kletnieks (Feb 15)
- RE: Anti-spam System Idea Tim Thorpe (Feb 14)
- Re: Anti-spam System Idea Rainer Atkins (Feb 15)
- RE: Anti-spam System Idea Michael . Dillon (Feb 16)
- Re: Anti-spam System Idea Michael . Dillon (Feb 16)
- RE: Anti-spam System Idea Lawrence Baldwin (Feb 16)
- Re: Anti-spam System Idea Niels Bakker (Feb 16)
- Re: Anti-spam System Idea Joe St Sauver (Feb 16)