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This commit implements Ingress and Egress filtering for IPv6 in Basic Networking. It allows for opening and closing ports just as can be done with IPv4. Rules have to be specified twice, once for IPv4 and once for IPv6, for example: - 22 until 22: 0.0.0.0/0 - 22 until 22: ::/0 Egress filtering works the same as with IPv4. When no rule is applied all traffic is allowed. Otherwise only the specified traffic (with DNS being the exception) is allowed. Signed-off-by: Wido den Hollander <wido@widodh.nl>