@andiroid

I didn’t do anything special about the prefix length, maybe Swisscom was just more generous with it.

Currently my IB3 receives a 56 prefix from the backbone when prefix delegation is switched on in the dual stack and when I then activate IPv6 native in my cascaded Asus Merlin network, I recognize a DHCPv6 bind to a 58 prefix in the Merlin log.

Werner

If you have the Fritzbox and are still with this “ISP”, you should probably try it.

Ultimately, I can’t say how the backend decides. But the Fritzbox can do it natively and if you had it directly on Anschluss, it would be a non-static /56 prefix.

So something like this (whether rapid commit is needed? try it out)

What Werner says is another story, a topic of its own. This is the prefix delegation in the Internet Box.

It would be important to know what you can delegate.

Previous firmware states that a /60 is delegated. In the thread linked to OP it is said that you only get a /62. The same people say here that you get a /58.

Ok, sounds really Swisscom 😄…

What can you get from the PD behind the Internet Box?

/58, /60 or /62?

These are such small differences as 64/64s, only 16/64s or even just 4/64s that could be made.

Conversely, this also applies to the possible number of routers (-1).

As I said, that would be a separate topic. Maybe once you have agreed on what to do 😉

@andiroid

Try switching it to dual stack.

Who knows, maybe it will work…

Think native IPv6 is enabled everywhere. Why not? You could simply put an IB into operation on Anschluss. Once Dual Stack is there, you can switch again.

You should leave the IB online for at least 24 hours. In my opinion, calling the hotline won’t help. You can try SAM. Maybe they can put you in touch with 2nd level support 🤣

During normal working hours, Sam initially only arranges contact with the 1st level in the chat. Only if he doesn’t get any further does he suggest that a specialist call you back. Outside of the helpdesk’s normal working hours, Sam sends a link to a support form.

If you don’t have a Simply Digital option, you can also call 1st level support and persist and request 2nd level.

In both cases it will be relatively difficult to get to someone who actually knows the problem and knows what IPv6 actually means.

Take a screenshot of the settings you can make on the Fritzbox.
The screenshot with the setting above is wrong when I read Fritzbox instructions.
The IPv6 setting should be set to native IPv4 even though you are actually using native IPv6 🙂

The Germans, with their ISPs that are too big, are using DS Lite. And if it is set to native IPv6, dual stack operation with DS Lite is tried…

And what would also be important is to replace the WAN interface each time. I think this can be done in the Fritzbox with a reboot.

Try using the init7 setting for the IPv6 tab, just use native IPv4. They have had native IPv6 for a long time and the settings are like this: [https://www.init7.net/de/support/routerinfos/2020\_fritzbox\_hybrid7\_und\_optimization\_dfe\_nr\_01.pdf](https://www.init7.net/de/support/ routerinfos/2020_fritzbox_hybrid7_und_optimization_dfe_nr_01.pdf)

🌈🐰7️⃣

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@andiroid wrote:

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@Tux0ne wrote:

Try using the init7 setting regarding the IPv6 tab, just use native IPv4.

🌈🐰7️⃣

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@Tux0ne: Thanks for the tip. Didn’t do anything. 😕 But I can’t set everything on my “old” 7490. VLAN can’t do that. Don’t think that matters, do you?

The error messages in the event viewer are still:

“DHCPv6 error with error reason 8 (UnspecFail)”

and

“Internet connection IPv6 could not be established: No response from DHCPv6 server (SOL)”

@MichelB: No news from the insiders? 😉

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Fritzbox = help yourself

@andiroid In the init7 instructions, just pay attention to the setting on the IPv6 tab! In this case, the others are init7 specific and are not suitable for the Swisscom Anschluss (in this case they use PPPoE over BBCS and therefore VLAN ID 11 for fiber optics…)

Did you choose anything related to Swisscom when selecting your ISP? For example, I can imagine that a parameter has already been set that is now somehow preventing it. AVM should check that. I assume they will do the same if you tell them

I don’t have a Fritzbox or Swisscom Anschluss to test this myself.

@andiroid
Those affected are welcome to contact our support: avm.de/service/support

Are you sure you don’t want a referral code too? 😉

@andiroid You probably didn’t understand the referral code. Thomas tries to reduce his monthly bill at Init7 by handing out referral codes for switching there. 😉 Of course he has to do something more subtle in the Swisscom forum.

Otherwise: [https://avm.de/service/wissenskatalog/dok/FRITZ-Box-7490/573\_IPv6-in-FRITZ-Box-einrichten/](https://avm.de/service/wissensdatendaten/dok /FRITZ-Box-7490/573_IPv6-in-FRITZ-Box-setup/)

However, I fear that the instructions are rather inadequate.