Hi, I've a tunnel from 2001:7b8:2ff:196::1 to 2001:7b8:2ff:196::2. This are the one IPv6 addresses I can use in the subnet without a subnet, can't I? So I have ordered a subnet now: 2001:7b8:3cd::/48 Is it a good idea to use the tunnels IP just for routing my subnet ans nothing else (i.e. don't provide services on 2001:7b8:2ff:196::2)? And now another question for my subnet 2001:7b8:3cd::/48: This means that the *network* has 48 bits and I can use 128-48=80 bits for my own network, can't I? Is there any convention on HOW to divide up the 2^80 IP ranges? I've heard that 64 Bits are always the host part...does this mean that I have "only" 80-64=16 bits for my own subnets? Or can I use (as with CIDR in IPv4) e.g. 72 (from my 80) bits for partitioning my network and use just the last 8 bits for the host part? Is there any recommendation on this? Thank you very much!