FAQ : Connectivity (Tunnels and Subnets) : Can I request multiple subnets over my tunnel?
Can I request multiple subnets over my tunnel?
As full subnets are in the size of /48's that should be big enough to serve your complete network. If you really need a second subnet over the same tunnel contact SixXS and explain why you would need it. We love to hear the arguments for such a case.
Note that one can have both the default routed /64, the one associated to the tunnel, and a /48 subnet routed over the tunnel.