Hello, I think I found bug in iputils-ping ping6 app: ping6 6bone-gw.ze.tarnow.pl -c2 PING 6bone-gw.ze.tarnow.pl(6bone-gw.ze.tarnow.pl) 56 data bytes >From 3ffe:81d0:ffff:2::13 icmp_seq=1 Destination unreachable: Address unreachableFrom 3ffe:81d0:ffff:2::13 icmp_seq=2 Destination unreachable: Address unreachable summary doesn't show until CTRL-C key pressed debian user Andrius K.