IPv6 native with FritzBox

andiroid · May 27, 2022

IPv6 native with FritzBox

Hello community!

If I understood it correctly here, native IPv6 now works together with the Swisscom routers. The possibility of sending V6 through V4 using 6RD through a tunnel is also possible for some time now with my plastic router.

@cybi already has the question here. asked, no answer yet. So here again, explicitly, in a new discussion thread:

Does native IPv6 work in the Swisscom network with third-party routers, especially with my favorite FritzBox!?

And no, I won’t cascade the FB behind the IB again. Not an option. For me, the power consumption, i.e. costs/benefits, is too high for the instantaneous heater.

Black Mamba · May 27, 2022

@andiroid

thanks for the contribution

There are always bugs that you can’t find without testing.

It’s a shame on productive devices.

At Swisscom, most users are in IPv6 Neverland and there are a lot of errors.

Errors were also reported at Centro Business, which were then corrected.

At the IB, the firewall settings are adjusted, IPv6 icmp.

And maybe PD will also work properly…
Or do you want to go to another ISP where you can get a native IPv6 with /48 prefix?

Static if desired.

this discussion can also help

Native IPv6 and DHCPv6-PD | Swisscom Community

andiroid · May 27, 2022

@Black Mamba wrote:

thanks for the contribution

There are always bugs that you can’t find without testing.

It’s a shame on productive devices.

Um, I’ll probably find these… 😂

At the IB, the firewall settings are adjusted, IPv6 icmp.

And maybe PD will also work properly…
Or you want to go to another ISP where you can get a native IPv6 with /48 prefix?

Static if desired.

I don’t want to use IB. I had cascaded routers for too long before I was finally able to obtain my SIP credentials. And actually I don’t want to change provider either. I’m far too comfortable there.

😕

I’m just wondering whether there are any restrictions that prevent IPv6 from being activated natively on the Fritzbox. And at the same time, of course, shut down the 6RD tunnel.

Has anyone already gone this route with a third-party router? Or does it only work adequately with the Internet shops?

Edit:…and of course not for Geschäftskunden. I have a normal private customer connection here.

Werner · May 27, 2022

@andiroid

The determination of whether your Anschluss IPv6 is served with 6rd or with the new IPv6 native with dual stack is not made on the router, but in the Swisscom backend.

Logically speaking, the system treats this as a contract attribute that cannot be influenced by the user themselves.

I don’t know how Swisscom deals with connections without Swisscom CPE.

Maybe they will be gradually changed in the background, but maybe not.

Have you ever tried to have your Anschluss converted to dual stack via the hotline?

If there was no knowledge about it, perhaps at least contact with the second level could be made.

By the way, I currently use a dual stack with prefix delegation and get a 58 prefix from an IB3 for my cascaded internal network, which also works very well.

Unlike you, I don’t want to replace the provider CPE at all, because Swisscom should take care of the proprietary technology changes from VDSL2 to g.Fast to XGS-PON and then to something else in the future…

andiroid · May 27, 2022

Thanks, @Werner for your additions!

The determination of whether your Anschluss IPv6 is served with 6rd or with the new IPv6 native with dual stack is not made on the router, but in the Swisscom backend.

Logically speaking, the system treats this as a contract attribute that cannot be influenced by the user themselves.

Really!? Well then I’ll really have to think about changing providers if the router requirement for the latest IP technology were reintroduced.

😕

Have you ever tried to have your Anschluss converted to dual stack via the hotline?

If there was no knowledge about it, perhaps at least contact with the second level could be made.

Well, that would also be a sign of poverty that I still have to call the hotline to check the config. This could be implemented in Kundencenter with little effort:

✅ Enable IPv6

✅ Get a new prefix every x weeks

Maybe I need to think about changing provider.

😕

What I would understand even less. The IPv6 traffic would then slide from the basement to the DSLAM to the “headquarters” and only then into the “foreign” network? (At least that’s how I imagine it…)

🙄

By the way, I currently use dual stack with prefix delegation and get a 58 prefix from an IB3 for my cascaded internal network, which also works very well.

Unlike you, I don’t want to replace the provider CPE at all, because Swisscom should take care of the proprietary technology changes from VDSL2 to g.Fast to XGS-PON and then to something else in the future…

I can understand this argument. But this is exactly where I see significantly more problems than benefits. SIP forwarding in particular was hair-raising back then. Ok, it worked, but subjectively I always had the feeling that I was traveling with a mess.

😉

That’s why I would first like to take the step to a proper dual stack and only then plan for a possible change of media.

How did you get the /58 prefix? I thought retail customers would only get a /60? Did you also call the hotline or the 2nd level!?

😜

Werner · May 27, 2022

@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.

Tux0ne · May 27, 2022

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 · May 27, 2022

Thank you @Tux0ne, but the short attempt only provided an IPv6 address with 6RD.

🙄

Nothing works natively yet…

😕

Has anyone else done it yet?

Werner · May 27, 2022

@andiroid

Try switching it to dual stack.

Who knows, maybe it will work…

5018 · May 27, 2022

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.

andiroid · May 27, 2022

@5018 wrote:

Think native IPv6 is enabled everywhere. Why not?

Good question. But no, the attempt did not convey a valid IPv6.

🤨

5018 · May 28, 2022

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 🤣

hed · May 28, 2022

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.

andiroid · Dec 10, 2022

So I’m continuing this thread here. Thanks @Tux0ne for the tip. I didn’t see it again until later and of course I didn’t remember the discussion from spring.

🤪

Then it would of course be important to mention how you want to operate the FRITZ!Box. Directly on the WAN or via PD on the Internet Büx.

The Fritzbox in question is connected directly to the WAN, no IB in between. I tried to implement your note. But I’m no longer sure whether this is correct for the direct Anschluss on the WAN.

As already described in the wrong thread, I get it with every attempt Event monitor of the FB the error message: Internet connection IPv6 could not be established: No response from the DHCPv6 server (SOL).

@MichelB: If you have relevant information like the @Tux0ne [here](https://community.swisscom.ch/t5/Router-Hardware/Migration-zu-Native- IPv6-Dualstack-completed/m-p/738839#M42287) requested would be available would you please place them here or somewhere else? Thank you!

🙋‍♂️

Tux0ne · Dec 10, 2022

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.

andiroid · Dec 10, 2022

Tux0ne Thanks! Here are my current settings:

I tried different variants with the LAN prefix without success. I didn’t restart because the event viewer showed a new error message about the unreachable DHCPv6 (“No response from DHCPv6 server (SOL)”) with every config change. But I’ll just try that…

…but there was no change either. 😕

Tux0ne · Dec 11, 2022

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

andiroid · Dec 12, 2022

@Tux0ne wrote:

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

🌈🐰7️⃣

@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 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? 😉

5018 · Dec 13, 2022

@andiroid wrote:

@Tux0ne wrote:

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

🌈🐰7️⃣

@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? 😉

Fritzbox = help yourself

andiroid · Dec 13, 2022

@5018 wrote:
Fritzbox = help yourself

Thank you for this extremely valuable contribution! <Irony off> Next time leave it on your keyboard. If I could help myself, I wouldn’t ask for help here.

😶