[Sshguard-users] proftpd maps ipv4 addresses to ipv6 in its log and sshguard treats them as ipv6

[Arne R. <arn...@go...>]

Hello,

when proftpd runs with ipv6 support, it maps ipv4 addresses to ipv6
(::ffff:1.2.3.4) in the log. Then sshguard treats it as ipv6 address
and executes e.g.

ip6tables -A sshguard -s ::ffff:1.2.3.4/128 -j DROP

so the ipv4 address will not be blocked with iptables.

I posted the problem here:

http://forums.proftpd.org/smf/index.php/topic,3817.msg13663.html#msg13663