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WAN interface IPv6 address changing

I would like to set up an AAAA record for our WAN interface, so that it is reachable from the outside. But I notice that the IPv6 address is not static.

Our ISP (Deutsche Telekom) has given us a static IPv4 address and a static IPv6 prefix, but says that the changing address has to do with the configuration on our equipment.

What could be causing the address to change?

How can I make it permanent?

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0 BAlfson over 4 years ago in reply to Alexander Busch

Sounds like it's time to get Sophos Support involved. Please let us know the solution.

Cheers - Bob

Sophos UTM Community Moderator
Sophos Certified Architect - UTM
Sophos Certified Engineer - XG
Gold Solution Partner since 2005

MediaSoft, Inc. USA
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0 emmosophos over 4 years ago in reply to Timotheus

Hello Alex/Timotheus,

Have any of you had the chance to open a case with Support if so, please let me know the Case ID so I can follow up.

Regards,

Emmanuel (EmmoSophos)

Technical Team Lead, Global Community Support
Sophos Support Videos | Product Documentation | @SophosSupport | Sign up for SMS Alerts
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0 Alexander Busch over 4 years ago in reply to Alexander Busch

I am not convinced that this is a mistake. So before opening a case I need to be more convinced.
The provider may be routing that customer network to the public address. So a change of the public address might not be a problem.
Enclosed is an excerpt of the provider's details:

Does this make any sense?

Best regards

Alex

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0 Timotheus over 4 years ago in reply to Alexander Busch

Good morning Alex,

I tend to agree that it does not look like a UTM error. It is more of a matter of knowing how to configure it.

It would be nice to know in advance what the "Static PPPOE IP:" on the under the WAN interface settings does and if that is meant for a situation like ours.

I am hesitant to try experiments.

Best regards,

Timotheus
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0 Timotheus over 4 years ago in reply to Timotheus

I decided to go ahead and select the "Static PPPOE IP" option. It has been more than 24 hours since I did this and things are running smoothly.
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0 Alexander Busch over 4 years ago in reply to Timotheus

Ok, may I ask which IPV6 address you put in the corresponding field of the interface? Like in my screenshot above DTAG gives only a subnet not a specific address.

BR

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0 Timotheus over 4 years ago in reply to Alexander Busch

Hello Alex,

When I clicked the 'Static PPPOE IP Address' box it displayed the v4 and v6 address that the WAN interface was currently using. I just accepted those.

I talked to a Telekom technician before I raised this issue here and he told me that the changing IPv6 address was because of our configuration not theirs. I am wondering if the UTM was choosing a new address every day. It would be very nice if somebody from Sophos would comment on this and tell us how it is meant to work.

Regards,

Timotheus
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0 Timotheus over 4 years ago in reply to Timotheus

It has been more than two weeks since I made this change and I have detected no negative effects.

Before I did this I was having occasional problems with the WAN interface not reconnecting when it disconnected once a day. That seems to be better now too.

My thanks to Alex and Bob who helped me search for a solution on this.

If any problems show up I will post them here, but for now I am regarding this issue as resolved.
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0 Alexander Busch over 4 years ago in reply to Timotheus

Inspired by Timotheus, I changed that setting at my location too. I can confirm stable connection and IP4/6 too. It seems that static setting fits well for Deutsche Telekom Deutschland LAN VDSL with static IP.

Best regards

Alex

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