Added passive_discovery6

tools/passive_discovery6.md

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+# passive_discovery6
+
+Notes
+-------
+
+Help Text
+-------
+```
+passive_discovery6 v2.3 (c) 2013 by van Hauser / THC <vh@thc.org> www.thc.org
+
+Syntax: passive_discovery6 [-Ds] [-m maxhop] [-R prefix] interface [script]
+
+Options:
+ -D          do also dump destination addresses (does not work with -m)
+ -s          do only print the addresses, no other output
+ -m maxhop   the maximum number of hops a target which is dumped may be away.
+             0 means local only, the maximum amount to make sense is usually 5
+ -R prefix   exchange the defined prefix with the link local prefix
+
+Passivly sniffs the network and dump all client's IPv6 addresses detected.
+Note that in a switched environment you get better results when additionally
+starting parasite6, however this will impact the network.
+If a script name is specified after the interface, it is called with the
+detected ipv6 address as first and the interface as second option.
+```
+
+Example Usage
+-------
+
+Links
+-------