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Re: Bounce/System Notification Address Verification

2005-06-28 23:11:36

At 18:04 +0100 on 06/28/2005, Tony Finch wrote about Re: Bounce/System Notification Address Verification:

On Tue, 28 Jun 2005 Valdis(_dot_)Kletnieks(_at_)vt(_dot_)edu wrote:

 The first rule of any protocol is that it has to interoperate with itself.
 The fact that this design *is* prone to disastrous loops when it encounters
other CBV systems with similar design flaws shows that the concept is flawed.

You haven't demonstrated that Verizon's implementation is flawed in this way.

There is only (as I've noted in a prior message) a flaw if when Verizon CBV probes an ISP and that ISP CBVs back in response to the probe, Verizon instead of accepting the CBV probe and responding with a "Good Address" reply turns around and tries to CBV the other Server. It is the job of Verizon (and other CBV users) to recognize the addresses used with their CBV probes and not respond with a CBV probe when the address is used by another CBV system. You handle CBV probles triggered by your own in-flight CBV probes do not require your CBV code to recognize other user's CBV probe patterns (ie: you should just CBV respond to them).


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