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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: RBL-type BGP service for known rogue networks?
On Mon, Jul 10, 2000 at 09:06:49AM -0700, Karyn Ulriksen wrote: > > I noticed that in BIND8, DNS gets _VERY_ unhappy if you use a CNAME for > the zone's MX. Maybe there's something else at work.... We're not talking about MXes here. Let's be very clear. We're talking a single workstation with a dynamic IP address. eiv.com's MX points to a completely different box, by an A record, just like it's supposed to. oa.eiv.com's IP address changes periodically, and has a reverse lookup that is not under my control. *ANYBODY* running sendmail on a box with a dynamic IP is going to see this behavior, unless they play magic sed games to change their sendmail config every time their IP changes. This actually would be doable in my case, but is hardly expectable of everybody who uses a dynamic IP. And then there are those MUAs that also act as MTAs, doing their own SMTP without going through an external server. They can't all be configured to do what Greg proposes, and who in their right mind would want them to be? I've quoted the RFC. It says he MUST NOT (it's emphasis, not mine) do what he's doing, in unambiguous terms. Beyond that, I don't really care if I can email him or not. I can email the rest of the world, except for a few ORBS nuts. No loss. DNS will resolve "oa.eiv.com" to the exact IP of the box sending the email. Greg considers that to be "forging a HELO", and equates it as "very nearly fraud". You'll have to judge for yourself whether or not that's reasonable. Frankly, I don't care; I've presented the evidence, everybody can make their own choices as to whose idea is reasonable. With very few exceptions, we're all adults here. Attachment:
pgp00031.pgp
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