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Why .biz is the Spam TLD
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Even if a zone is updated, records that have been previously fetched from that zone will tend to still exist in the net for the duration of their TTL. This period can be several days or even weeks.
In addition, DNS zones are identified by a 32-bit number. The rate of republication of a zone ought not to exceed once every second or so else there is risk that that number will wrap. I have not experimented with zone identifier wrap issues but it wouldn't surprise me if some implementations didn't get the arithmetic right.
(Even at once per second, it takes about 70 years for a 32-bit counter to trigger the high order bit and another 70 years to reach roll over. There is a Y2K type issue in this regard waiting for us in about 34 years when the standard time_t value used in a mountain of code wraps - the precise time is 19-January-2038 at 3:14:07 AM GMT)
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Yeah, I have heard about that. It has something to do with the year 1970, but haven't investigated it further.
Cheers,
Doug
Doug Mehus
http://doug.mehus.info/ [mehus.info]
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Yes -- but if a spammer sets up the zone, they can specify the TTL, and specify a low one.
Regarding the 32-bit rollover problem -- it's likely that they wouldn't have to update the zone more often than once every 10 minutes or so at most to evade shutdowns.
BTW, worth noting that I'm not suggesting that EPP is a bad thing, per se -- it's just interesting that .biz (and .info, to a lesser degree) has become the spammer's choice of TLD, as a side effect. As for a response to this, I haven't a clue ;) For now, it provides handy info for spam filters -- a .biz URL in an email has a shockingly high spam probability.
Interesting that .org also uses EPP -- I haven't yet seen many .orgs in modern spam...
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