- stf interface is necessary for 6to4 relays only - improve description on filtering (will move tag)
- stf interface is necessary for 6to4 relays only
- improve description on filtering
(will move tag)

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame