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IPv6 routes expire on Debian (lenny) vm

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http://serverfault.com – I have a xen domU that keeps forgetting the routes learned after interface startup; for a while everything is ok but eventually the two default routes (a couple link-local addresses of the upstream routers) expire and the machine drops off IPv6 based networks. I'm puzzled as to what could the problem be; obviously the router is answering the first discovery, but why is is failing to refresh or re-discover? Edoardo ()