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Upstream commit v3.5-rc1~109^2~138^2~4 ("netfilter: ip6_tables: add
flags parameter to ipv6_find_hdr()") changed the offset parameter of
ipv6_find_hdr() to be an input-output value. Moreover, if it is
non-zero, it MUST point to a valid IPv6 header embedded in the
packet.
PSD (Portscan Detection) External extensions for Xtables-addons Example: iptables -A INPUT -m psd --psd-weight-threshold 21 --psd-delay-threshold 300 --psd-lo-ports-weight 1 --psd-hi-ports-weight 10 -j LOG --log-prefix "PSD: "