Hi there, sorry for writing in english but my czech isn't yet good enough...
I had my internet with VF for a few years now (1G cable) and recently decided to implement proper sanitation on the network to block my son from accessing brainrot content on various websites; well turns out that android doesn't support DHCPv6 and bypasses my custom DHCP server for the IPv6 stack via SLAAC.

Obviously it's not a direct fault of VF but i cannot push my custom DNS (pihole) to android devices as the Router Advertisement is non configurable on the VF station; since I don't care too much about old IPv4, I thought that it will be easy to simply create a new network with my own router, implications are double NAT for IPv4 and routed IPv6 via prefix-delegation form the VF station.

Well found out that the old VF station doesn't allow DHCPv6 PD and shows this message instead:
Server support for prefix delegation is not enabled. Sorry buddy.

Aight so I'm pounding sand here, decided to call VF support and ask if it would be possible to order the new FritzBox modem/router and get rid of that crappy VF station,
I will be getting a new unit next Tuesday!
Now if anyone knows, is the DHCPv6 PD properly implemented in the new FritzBox? I know it works on the stock firmware, but you never know how much VF cripples it

Hi, Fritz!box is used in Germany few year, maybe on their forums you will find answer. But if you need or want detailed configuration, it is better (and mostly only) solution to switch router from Vodafone to bridge mode and plug own configuratable device. Beware, Fritz!box don't support bridge mode.

https://en.fritz.com/service/knowledge-base/dok/FRITZ-Box-7490/1239_Setting-up-an-IPv6-subnet-in-the-FRITZ-Box/

Beware, VF Fritzbox has custom firmware, which has some features disabled compared to retail firmware (and no, you can't load retail firmware in VF Fritzbox).

Upraveno sobota v 11:09 3 dny uživatelem quadra2030

I am really curious if this will be one of the disabled features (=if this will be yet another crippled router from VF). Looking forward to the result of the test.

No idea about PD, but it is yet another crippled router from VF - due to disabled bridge mode, unfortunately. I would love to upgrade, but this is a deal breaker for me.

There might be valid reasons on why bridge mode is not supported on VF routers (XLAT and RA parameters probably), nevertheless since I don't care about IPv4 too much I'm more than happy to throw my own router down the road, but currently VF routers don't allow this (disregarding IETF recommendations, partially implementing rfc3769), as they disable the only meaningful way of doing it by blocking IPv6 prefix delegation via DHCPv6 PD requests.

With the old VF station you simply cannot put another router below it, without doing nasty crap like NAT66 (then WTH is the point of assigning a /56 to my VF station?) or NDPProxying (it hurt my brain just to think about it).

Meanwhile VF please get your shit together with the IPv6 stuff, it's 2025...

Upraveno sobota v 17:37 3 dny uživatelem dinotromba

5 hours ago, r2d2 said:

No idea about PD, but it is yet another crippled router from VF - due to disabled bridge mode

This is AVM limitation, not VF.. it's not a bug, it's a feature 🙂 bridge mode functionality can be enabled unofficially (without support), but the cable operator must provide 3 IP addresses for Fritzbox, which is a problem with VF (at least in DE because of MaxCPE=2).. other modem/router brands require 2 IP addreses, so bridge mode does work.

Upraveno sobota v 21:46 3 dny uživatelem quadra2030

@quadra2030 Sorry if that was not clear—I meant that it is yet another crippled router from VF, as supplied by them. I don't know if it was crippled by VF or AVM, but that is a secondary question. The important thing is that it cannot perform this very basic functionality, which is a must for me.

Ok so I received the new Fritzbox and to my surprise it seems it's a stock firmware. Doesn't seem that VF cripples it in any way.

Means that all the IPv6 functionality is supported out of the box and that includes full support for prefix delegation and your own router down the road (some configuration is required, PD downstream is not enabled by default on the FritzBox)

Unfortunately I hadn't tested it with full connectivity because at the start of my IPv6 adventure I was so pissed at VF that I requested a switch to TMobile (which gives me double upload speed for the same price), and thought would have enough time to test it before they switch the connection, but alas the timing wasn't right.

Now I'm using the TM junk (which actually runs the same software and configuration as the old VF station), but TM supports bridged operation and I made a call to support and it works fine with my own mikrotik router.

Conclusions:
For power users or anyone who wants to setup networking their own way, with VF the only viable way of implementing it, is by paying the "premium" equipment fee for the FritzBox, which in my personal opinion is absolutely worth it; for the unfortunate souls who have ordered the standard equipment (VFStation) well you're out of luck! You can only implement proper connectivity via NAT66, i personally tested NDP proxy but the VF station doesn't pickup the advertised routes anyway.

As long as you're on cable (DOCSIS 3.1) you should be able to request the upgrade to fritzbox anytime, contact VF support if you do and ask them.

Upraveno před 4 hodinami 4 hod uživatelem dinotromba

just curious about the new service: now that you are operating their modem in bridge mode, do you get a RFC 6598 IPv4 address from them (100.64 to 100.127) and a properly delegated IPv6 /56?