allio:
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One router firmware upgrade later and I'm connected again. The old version had a bug that stopped IPv6 settings from being saved.
Very easy with Advanced Tomato
Working fine here too on Advanced Tomato 132. Very easy. Changed settings and rebooted. Didn't have to do a thing with the bridged Vigor 130.
Small correction - all works perfectly except DNS. Even after manually entering the Bigpipe DNS servers into the router settings, they're not being served up to any of my devices. Works fine once I manually set the DNS servers on the client. This is almost certainly at my end.
Detruire: does IPv6 DNS work correctly for you? What version of Tomato were you having trouble with, and what did you update to?