I read last year that you made this switch and it is a good idea, however, with IPv6 compatibility now provided (since couple months), it should work but it does not…so I will try to make it work with my current setup, going for a small business contract will be then the last resort.
After I made the switch, they told me in another phone call that they could have given me a proper address in my residential account as well, I just should have asked 
I hadn’t because on their forums they had answered lots of requests by other people with “no can’t do”. I guess it depends on where you are and it’s worth calling them …
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Thank you for the motivation @Suedkiez , I gave it a try and the Vodafone hotline was quite helpful. They agreed to implement Dual Stack (with a fix IPv4) for a little upcharge of 3€/month. Plus my bandwidth will be increased from 100 to 500 Mbit. I think this is fair so I agreed.
so my support case here can be closed, there was no fix in the end but with an IPv4 address it should work (I hope)
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Good luck. I had another adventure after that, where despite my new contractual IPv4 they were blocking all ports on my IP for outside accesses coming from my phone in the Vodafone mobile network (Vodafone SIM). It worked with a Telekom SIM and from foreign LANs. That necessitated more phone calls with their support to explain to them how the Internet is supposed to work.
(In my case, the issue occurred with the Vodafone Station standard router. While I was making my way through to 3rd level support (and I think they probably would have solved it), I bought a private Fritzbox and then it immediately worked, so it was never clarified what the heck was going on with the Vodafone Station router)
Plus, we have seen another issue on the forum occurring with Vodafone mobile if the Vodafone SecureNet was active. They include that in new Vodafone mobile contracts and it’s free for 3 months, and then they start charging. So you need to cancel that in new contracts. The affected forum user had forgotten to cancel and it had remained active, leading to blocked ports on the phone and ARC not working. All fine after turning this off.
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Good to know, thanks. I have T-Mobile and my own FritzBox, so there is hope! I will report back.
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It works!! Kudos to Vodafone for the quick implementation. I had the 500 Mbit bandwidth already yesterday evening as well as the IPv4 address. If I compare the 500$ for the Starlink business mentioned in this thread, the additional 3€ seem like a bargain…
So for the 1st time in the era of ARC, I can use it 
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Great, enjoy!
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Hi Connor,
Can you please provide an update for all the customers waiting for IPv6 support? I was hoping that build that allowed new code to be released to specific users would help in testing IPv6 but it appears that build failed and was pulled back. Do you have anything you can add for us?
Thanks,
D
This is a bit after your last post but in case you haven’t heard anything from Roon, their problems are with all CGNAT and IPv6 providers. I think some IPv6 addresses will work as long as none of the hex quads starts with a zero which causes them to fail with “Invalid hex digit” for the following hex digit (e.g. if the third quad starts with zero it will report an error on digit 10). Build 1324 was (afaik) intended to allow them to test changes to their code to fix these CGNAT and IPv6 problems by enabling fixes for individual customers but 1324 failed. That’s all I have so far and they are no longer talking about this publicly.
Edit: Yes, many mobile networks will not get a connection to your Roon Core if your home network must be reached over CGNAT or IPv6.
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Hi everyone,
There’s a forthcoming fix for the hex group mishandling that has kicked errors with Starlink and several dual-stack implementations. We’ll be tracking it here: ARC With Starlink: IPv6 WAN IP Issue with RoonServer [Ticket In]
This thread will close for housekeeping in the meantime.