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8 groups of 4-digit hexadecial 3ffe:0507:0000:0001:0200:86ff:fe05:80fa 0000:0000:0000:0000:0000:0000:0000:0001 You can omit starting “0″ in each of the groups 3ffe:507:0:1:200:86ff:fe05:80fa 0:0:0:0:0:0:0:1 In only one place, you can use “::” to denote continuous “0″ 3ffe:507::1:200:86ff:fe05:80fa ::1 Usually you do not write numeric IPv6 addresses, use DNS names Download article as PDF
Source: http://www.davidc.net/networking/ipv6-source-address-selection-linux Sometimes it is desirable to have the outgoing IPv6 address on an interface selected deterministically. All else being equal, Linux will default to using the latest address added to the interface as the source address. This is generally not what you would expect or want. This article describes how to influence the source address [...]
