[Asrg] Round 2 of the DNSBL BCP

[der Mouse]

> Most DNSBLs follow a convention of entries for IPs in
> 127.0.0.0/8 (127.0.0.0-127.0.0.255) to
> provide online indication of whether the DNSBL is operational.

This still has the problem that 127.0.0.0/8 is not
127.0.0.0-127.0.0.255.  127.0.0.0/8 is 127.0.0.0-127.255.255.255;
127.0.0.0-127.0.0.255 is 127.0.0.0/24.

>>>   Many DNSBLs arrange to have a query
>>>    of 127.0.0.2 return an A record indicating that the IP is  
>>> listed, and
>>>    a query of 127.0.0.1 return no A record (NXDOMAIN).  When both of
>>>    these indicators are present, this indicates that the DNSBL is
>>>    functioning normally.  See [DNSBL-EMAIL].
> There is a problem with the above.  The reason for the "MUST NOT list
> 127.0.0.1" (elsewhere) is [...].  This is something that Vixie said
> years ago.  Yet, we're telling them to explicitly list it here.

The text you quote says to list 127.0.0.2 and to _not_ list 127.0.0.1.

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