On 2-2-2010 19:01, David F. Skoll wrote:
In other words, what is the difference between an SMTP client coming
from "::ffff:192.168.10.1" or "192.168.10.1" ?
or ::ffff:c0a8:a01. Well not a lot I would guess except that one is ipv6
the other ipv4. Guess it all depends on semantics .. probably nothing
functional but I thought I would bring it up.
I made the C code recognize mapped IPv4 addresses and convert them to
plain IPv4 addresses to simplify the filter code. If you get an IPv4
address, fine... you can handle it. Similarly, if you get an IPv6
address, you don't need to worry about the (IMO hackish and ugly)
IPv4-mapped special case.
No questions remarks there :)
Say you are on a ipv4 only network you would never receive those
addresses while if you are on a ipv6 only network all of a sudden you
might get data from an ipv4 address (but you are ipv6 only), that might
throw a spanner in the works.
How so?
Well database and code could only assume that they get ipv6 addresses.
But then I guess there is no one stopping you encoding all ipv4 as 6 :)
and I guess we can revisit when more of the world is using ipv6 .. like
in 100 years :)
I doubt any RBL would list the IPv6-variant without also listing the
IPv4 variant.
I have yet to use RBL's that even deal with ipv6 let alone ipv4 mapped
variants.
I will see when I can get the patch altered not to take into account the
ipv6 mapped ipv4, as the c code handles that part.
Regards,
--
Michiel Brandenburg
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