[Asrg] For DNSBLs, embedded IPv4 in IPv6

[Douglas Otis]

On Aug 4, 2008, at 6:01 AM, John Levine wrote:

>>>> Someone pointed out that in some popular dual stack systems,
>>>> connections from IPv4 addresses appear as IPv6 addresses
>>>> in :FFFF:0000:0000/96
>>
>> Could someone explain why a DNSBL needs to return IPV6 addresses?
>
> I don't know anyone who thinks that a DNSBL should return anything  
> other than A and TXT records.  What leads you to believe otherwise?

Agreed.  Keep answers to A and TXT records.  Just different names are  
being questioned.  A records provide 4095 different values which seems  
more that adequate.  Internally, we are using 16 bits filtered against  
customer preferences.  When memory becomes limited, TXT records seem  
the first items dropped from the answer.

-Doug