Simon, am Wed, Apr 24, 2013 at 05:15:37PM +0200 hast du folgendes geschrieben: > I guess I just don't understand where those IPv4-mapped IPv6 > addresses that the SPF process needs to check are coming from. An > example would be very helpful.
on Linux, if you set bindv6only to 0 and set up a socket listening on AF_INET6 you are able to receive IPv4 connections to that IPv6 socket. The source IPs will be mapped into IPv4-mapped IPv6 space. This means that you only need to setup one socket instead of one for v4 and one for v6. > Yeah, this is bad. Variants arise in many situations. Usually it is > solved by treating IPv6 addresses as opaque and not giving any > special meaning to the IPv4-mapped prefix. As above that does not help. If your SPF process is operating in the setup above, IPv4-mapped IPv6 space needs to be treated with the IPv4 ruleset. Kind regards Philipp Kern
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