Nachdem ja der JOIN-Server wieder geht, hier nochmal eine E-Mail von mir... Hi, perhaps is useful for other, too: I've created in C a tool called "ipv6calc" to manipulate IPv6 addresses, more information is available here: http://www.bieringer.de/linux/IPv6/tools/index.html#ipv6calc Source is available here: ftp://ftp.bieringer.de/pub/linux/IPv6/ipv6calc/ An RPM can be built using "rpm -ta ..." The feature of the rather old tool "ip6_int" to create a reverse dot separated nibble string out of a normal IPv6 address is also built-in. Any suggestions for other features to include are welcome, the fastest way is sending diff-files ;-) Hope this helps, Peter BTW: for my set of initscript users: At ftp://ftp.bieringer.de/pub/linux/IPv6/initscripts/testing/ are new network-functions-ipv6 files available, which uses "ipv6calc" for "duplicate address detection" and "address exists tests". Beta testers are welcome, please report problems.