Hello Alexander,
On Thu, May 20, 2021, at 7:33 AM, Alexander Stoll wrote:
> When you recieve only a /64 subnet, this gets gets realy complicated and
> depends on every involved software which has to support subnets smaller
> than /64.
> In this situation you may be better off with a NAT solution.
Here, with ATT as my upstream, the MODEM, which sits in front of the ROUTER,
_serves_ a delegation via DHCP6 via its ROUTER-facing interface.
That "IPv6 Addressing Subnet (including length)", apparently configured from
upstream, is a /64.
THAT is what the ROUTER gets.
As far as I tell, that can't be changed. At least not in the UI. Maybe
there's a 'hidden' setting you can set via SSH session; I sure haven't found
it yet.
Internally, the LAN clients get delegated assignments from radvd, using a
"prefix ::/64 {" advertisement. I _might_ be able to safely expand that beyond
the /64 -- I just am not sure.
Since I (1) don't get a /56, and (2) control _none_ of the upstream, sounds
like NAT is my best bet. Even if 'ugly'.
Thanks!
Thad
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