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I have a strange issue with my UTM. For now reason it seems like the Sophos stops broadcasting it's router role for IPv6. It simply stops routing IPv6 Prefix and even with a static assignment it is not routing any IPv6 Traffic anymore.
However: The problem seems resolved when I turn router advertisement off and on again (on any interface). But the problem reappears after about 4-5 days without any other changes to the UTM and it feels like this should not happen.
This happens with and without IPv6 DHCP.
i have reported IPv6 Problems to Sophos a few times (see https://community.sophos.com/products/unified-threat-management/f/management-networking-logging-and-reporting/78380/ipv6-in-broken-state)
its beeing ignored. IPv6 seems to be optional if it works or not right now for sophos.
In reply to Ben:
Crap... ok then just as an Information for the people who might be working on it:
The last bigger change I made was setting up upload balancing and multiple external gateways.
In reply to Weatherlights:
Update on this issue, it still exists.
A renew of external interface does not update IPv6 connections. I might not have waited long enough after disabling IPv6 then re-enabling it to cause IPv6 update on the external interface. I restarted the UTM and the a new real external address was assigned.
This is the same issue as on the XG, so looks like there is a common driver issue that needs to be addressed. (just to add to Ben's complaint)
I have the same problem after the last two updates. No fix for this issue since now.