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In reply to ben83:
my ISP also gives out a /48 ipv6 subnet when connected to a Fritzbox over PPPOE, when using the sophos the ipv6 subnet does not "appear" and the interface only gets a link lokal adress.
In reply to adhodgson:
Once I ticked the default GW on the external interface I could see the delegation on the IPV6 page in interfaces and routing. I don't know if that was all I needed to do to get it working, or whether the previous steps were also required. I don't really want to flatten the UTM to try it out since Sophos have remote access to it now.