On Wed, 09 Apr 2014 11:07:36 +0100, Fabien Bourdaire said:

> # Log rules
> iptables -t filter -A INPUT  -p tcp --dport 443  -m u32 --u32 \
> "52=0x18030000:0x1803FFFF" -j LOG --log-prefix "BLOCKED: HEARTBEAT"

That 52= isn't going to work if it's an IPv4 packet with an unexpected
number IP or TCP options, or an IPv6 connection....

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