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Operation not permitted on ping6 after mip6d establishes MIPv6 tunnel

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http://serverfault.com – I'm very much out of ideas here: I run mobile IPv6 on Ubuntu oneiric, with a simple fixed-address setup. mip6d establishes a tunnel, but as soon as the tunnel establishes I lose all network connectivity. I cannot ping, I cannot telnet/ssh, existing connections die, and even ping6 ::1 gives "Operation not permitted". I also have other network interfaces and I lose network on those as well. There is no Firewall, no ip6tables rules that deny or drop anything, ufw is disabled, and I am running as root. If I misconfigure MIPv6 so that it fails to establish the tunnel, this doesn't happen and I c (HowTos)