Re: [Asrg] For DNSBLs, embedded IPv4 in IPv6

[Daniel Feenberg <feenberg at nber.org>]

On Mon, 4 Aug 2008, 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?

A missunderstanding perhaps? There has been a lot of discussion in this 
list about IPV6, after all. Is all this discussion about queries for the 
status of the IPV6 equivalents of 127.0.0.X for testing if the DNSBL 
covers IPV6 addresses? But aren't all IPV4 addresses expressible in IPV6 
format? Won't those addresses do?

Daniel Feenberg

> R's,
> John
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