Need help with ipv6

I'm asking for the /64 from a provider, and get this answer :

Assignet subnet is : 2607:F130:0000:001B::/64 
Gateway 2607:F130:0000:001B::1/64

So, if I want to apply for example 2 or 4 ipv6 in the vps, what should I do in the interfaces?
I've tried this :

iface eth0 inet6 static
      address 2607:f130:0:1b::2
    netmask 64
    gateway 2607:f130:0:1b::1

    up /sbin/ifconfig eth0 inet6 add 2607:f130:0000:001b::3/64

It can show the following ipv6 when I give the command ifconfig :
- 2607:f130:0000:001b::2
- 2607:f130:0000:001b::3

I can ping6 ipv6.google.com, but the ipv6 itself can't be pinged from the outside. It's always unreachable.