Please enable ipv6 on tcp_wrappers. Among IPv6 patches, this is high priority as a few apps are compiled against libwrap (like patched sendmail, openssh, etc.) and they should be rebuilt afterwards. .src.rpm against the latest (tcp_wrappers-7.6-18) is available at http://www.netcore.fi/pekkas/linux/ipv6/
Done in Rawhide. Thanks! :-)