[ipv6hackers] IPv6 configure HomeNet with multiple subnets

Marc Heuse mh at mh-sec.de
Mon Oct 30 06:51:06 CET 2017

Hi Holger,

that the ISP sends a /56 or /48 is standard.
I don't think there is a dhcpv6 or RA daemon that handles getting the range and distributing it locally, but you might be lucky by searching the open source directory of dsl router vendors like avm etc

Otherwise just roll your own, should be pretty easy when using RA. When the network range changes you deprecate the old one (lifetime 0) and send the new one.

Greets Marc

> Am 22.10.2017 um 17:03 schrieb Holger von Rhein <ipv6hackers at lortas.de>:
> Hi all,
> can someone point me to the right direction for the following problem:
> I have an ISP which support native IPv4+IPv6. It provides IPv4+IPv6 addresses for the router and an IPv6 /48-prefix (yes not /64) to be used for the systems behind the ISP-router.
> But, not only the IPv4 changes periodically. Also the IPv6 address and prefix changes periodically too. :-(
> The ISP-Router is running FRITZ!OS 06.90 
> I have attached to the ISP-Router a self-made Linux-Gateway. All sub-networks are connect to my Linux-Gateway.
> IPv4 is running well in this setting. IPv4-NAT is done on the ISP-router.
> But how do I handle the periodic changing IPv6 /48-prefix? As I have seen, I can only set "static" entries in radvd.
> Is there something I am missing or does this setting not work with periodic changing IPv6 /48-prefix?
> Is there some advertisement the ISP-Router is sending, I have to look for?
> Kind Regards
> Holger von Rhein
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