On Fri, 16 Aug 2002 12:56:21 EDT, Bill Cunningham said: > So the responsibility should be placed on lower tier ISPs, what about the > main backbone like MAES. Note that there's a *lot* of private peering agreements in place, and traffic exchange points like MAES don't see all the traffic. In addition, it's tough enough to just *route* traffic at OC-48 speeds, trying to do filtering intelligent enough to determine spam/not at line speeds is quite formidable (hint - at OC-48, you're going about 300 Mbytes/sec - this means with a 3K e-mail, you have all of about 10 microseconds to make a decision before you start causing delays). I won't even start contemplating what happens at OC-192 trunks. Also note that many of the Tier-1 providers have a financial disincentive to do anything, as they are merely paid to move traffic - and the more spam the more traffic and thus the more income. The last thing they want is for a successful anti-spam campaign when there's already a bandwidth glut in the core.... -- Valdis Kletnieks Computer Systems Senior Engineer Virginia Tech
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