dhcpcd-discuss

Re SLAAC: this ain't a problem with SLAAC, but instead the particular router. When a prefix change happens, the subnet router has to correctly retire old prefixes. Yes, this requires some integration logic to correctly direct radvd through this maneuver. ;)
Best regards,Harald


-------- Ursprüngliche Nachricht --------
Von: Lars Schotte <lars@xxxxxxxxx> 
Datum: 28.05.17  17:46  (GMT+01:00) 
An: Harald Albrecht <harald.albrecht@xxxxxxx> 
Cc: Harald Dunkel <harri@xxxxxxxxx>, Roy Marples <roy@xxxxxxxxxxxx>, dhcpcd-discuss@xxxxxxxxxxxx 
Betreff: Re: [dhcpcd-discuss] problem with expired prefix (dhcpv6) 

That's pretty much always the case.
Cablesurf in Nuernberg DOCSIS IPv6 DHCPv6 PD.
Also here Slovak Orange (French Telecom) DSL PPPoE DHCPv6 PD.

Basically when you have a link reset you have no right to get the same
IP/PD. Unless you have a static option. So this should not be a
problem. The DHCPCD client is responsible to configure all again right
so that the flow can continue immediately. Over new TCP connections of
course.

To Deutsche Telekom it also might be a privacy feature, that you have a
24hour disconnect anyways and then you get a new prefix with it. So you
have a new prefix every 24hours like with the old IPv4 DSL.

This can be a problem then for your LAN with SLAAC. Because all
computers will still keep the old addresses even if you deconfigure
them on your router and restart RTADVD service. That might be a reason
not to use SLAAC but SLAAC only for link-local and site local
configuration with your router's address (router advertisements).
And for global connectivity DHCPv6 with lease times less than 1 hour.

On Sun, 28 May 2017 17:27:36 +0200
Harald Albrecht <harald.albrecht@xxxxxxx> wrote:

> My current, albeit limited, understanding is that DTAG won't assign
> the same prefix after link reset, even if you offer them the old one.
> The rationale might be that the prefix immediately gets returned to
> the prefix pool on link down. Best regards,another Harald


-- 
 Lars Schotte
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