[TAG] RR

[Mike Steele]

In response to

Users are caught in the middle of a debate over whether reverse records 
should be used for identification. The pro argument is that it helps 
identify spammers and abusers. The con argument (which I believe) is 
that the purpose of domain names is convenience: so you don't have to 
remember a number, and so that a site can maintain a "permanent" 
identifier even if they move to another server or a different ISP. You 
shouldn't /have/ to have a domain name, much less have it set to any 
particular value. And to identify scRipT kIddyZ, just do a simple 
traceroute. The second-last hop is their ISP (or part of their own 
network), and ISPs always have their own domain name showing. And what 
if a computer has several domain names, each hosted at a different 
organization? There can be only one reverse record, so all the other 
names will be left out in the cold.

at http://linuxgazette.net/issue68/tag/9.html




I always assumed the cost to be for the liability. Otherwise they would 
just automate it and have you do it online.  This seems to thwart spam; 
email administrators put an additional reverse record lookup to make 
sure it is not a "rogue" mail server put online by just anyone.  They 
have to contact their ISP and get a reverse record.  It's like adding 
locks to your door.  It isn't a guarantee - just a deterrent.  That one 
reverse record is for the mail server.  Otherwise RR's are not necessary 
and so it doesn't matter if there are multiple domains.  You can CNAME 
the domains MX records to the actual server name.

Dunno for sure but thats my 2 cents.

Mike


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