On Tue, 2003-10-21 at 11:37, Dan Monjar wrote: > I hit send too quickly... more to the point, how do you dynamic IP folks > handle the problem? dyndns.org can supply a forward pointer for your IP > address (say monjar.dyndns.org pointing to 1.1.1.1) but since they don't > own the 1.1.1.0 block they can't setup the reverse record, right?
Most dynamic IP addresses have proper PTR records configured by the ISP. For example: $ host portzer.com portzer.com has address 24.136.134.178 $ host 24.136.134.178 178.134.136.24.in-addr.arpa domain name pointer user-0c8h1li.cable.mindspring.com. $ host user-0c8h1li.cable.mindspring.com. user-0c8h1li.cable.mindspring.com has address 24.136.134.178 Since the forward address and reverse address are fine, 24.136.134.178 <=> user-0c8h1li.cable.mindspring.com, then there is no problem. The fact that "portzer.com", my vanity name, points to that same IP isn't really related -- as long as reverse DNS works, and the record returned by reverse DNS works in the forward direction, then everything's kosher. Now, I suppose a truly restrictive spam protection system could require that the delivery address's MX record match the name of the reverse lookup, but that would block delivery to millions of addresses using name-based virtual hosting. I don't think you'll see this happen any time soon. --Jeremy -- /---------------------------------------------------------------------\ | Jeremy Portzer [EMAIL PROTECTED] trilug.org/~jeremy | | GPG Fingerprint: 712D 77C7 AB2D 2130 989F E135 6F9F F7BC CC1A 7B92 | \---------------------------------------------------------------------/
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