I don't use SLAAC as stated in my previous email.  I use DHCP.  I have
radvd configured so that a device must get a lease.  My setup works.

Sadly, this leaves Android devices out in the cold IPv6 wise. **cough**, 
Lorenzo, **cough**.
https://www.techrepublic.com/article/androids-lack-of-dhcpv6-support-poses-security-and-ipv6-deployment-issues/

I would be glad to configure my internal networks to use a /64 but I must
work with what I have.  The Comcast modem won't issue me a PD and it
appears that even if it did, that it would not be routed.  I've spent a lot of
time on this trying to get it to work the 'recommended' way with no joy.

IPv6 still has a lot of ruff edges.

Bill

On 1/9/2018 7:24 AM, Tuomo Soini wrote:
On Tue, 9 Jan 2018 11:46:06 +0100
Oliver Freyermuth via Shorewall-users
<shorewall-users@lists.sourceforge.net> wrote:

radvd.conf:
interface lan4 {
   ...
   prefix 2603:xxxx:yyyy:xxxx:4::1/80 {
     ...
   }
}
It complains about it not being a /64 but it works.
/64 is absolute requirement for stateless autoconfiguration. It can not
work properly on smaller network.




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