On 9/27/2013 8:09 AM, Tim Nelson wrote:
> Alright, I understand IPv6 is a 'different animal'. BUT, I'm trying to do 
> something that seems logical, but not working. Hoping someone can shed light 
> on it?
> 
> I have an IPv6 tunnel from Hurricane Electric. The /64 is routed to my GIF 
> interface. I requested another /48 for assignment internally. If I assign the 
> full /48 to an interface, everything works as expected. However, if I subnet 
> that /48 into smaller networks (say some /54s), and assign individual /54s to 
> multiple interfaces, none of them appear to work.
> 
> Can I not split up a larger subnet into smaller ones with IPv6? Firewall 
> rules are legit for each of the interfaces, routing is correct, etc. With 
> IPv4 this is straight forward... :(
> 
> Thoughts?

I split my he.net assigned /48 into many /64's and a couple larger
chunks for testing various things (DHCP6-PD, VPNs, etc) and haven't had
any problems.

Generally speaking when you assign a subnet to an interface for use, you
want that to be a /64 only. Larger chunks would be routed, either by
static routes, PD, or some other means.

Jim
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