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+
+Sometimes you want to listen on an IPv6 address (out of several), but don't
+want it to be used by default for outgoing connections. One resolution is to be
+very careful about what order the addresses are added (it seems the most recent
+is default). Another is to change an IPv6 address to be "less prefereed" or
+"depcrecated" using the "preferred_lft" flag to the ip command:
+
+ sudo ip -6 addr change 2600:3c01:e000:001a::1205/64 dev eth0:0 preferred_lft 0
+
+This can also be specified at 'add' time in /etc/network/interfaces. See here
+for more details, or check RFC 3484:
+
+ http://www.davidc.net/networking/ipv6-source-address-selection-linux