This sounds like a gufw specific issue. ufw by default does not have IPv6
support enabled, so what it does instead is that if it is available on the
host, it will disallow all incoming and outgoing traffic, except on the
loopback. This is not clear with 'ip6tables -L'. Use the following:
$ sudo ip6tables -n -v -L
Chain INPUT (policy DROP 32 packets, 7237 bytes)
pkts bytes target prot opt in out source destination
2 140 ACCEPT all lo * ::/0 ::/0
Chain FORWARD (policy DROP 47 packets, 4997 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy DROP 466 packets, 77344 bytes)
pkts bytes target prot opt in out source destination
2 140 ACCEPT all * lo ::/0 ::/0
See 'man ufw' for more information on IPv6 support.
** Package changed: ufw (Ubuntu) => gui-ufw (Ubuntu)
** Visibility changed to: Public
** This bug is no longer flagged as a security vulnerability
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Ufw firewal not activated by default after ubuntu 10.04 installation.
https://bugs.launchpad.net/bugs/626155
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