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I am assigning ipv6 address using ioctl() system call prgramtically. I want to know if there is a way, i can find the assigned ip is tentative/duplicate ?
Thanks.
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An IPv6 address is represented as eight groups of four hexadecimal digits, each group representing 16 bits The groups are separated by colons (:). An example of an IPv6 address is: 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
IPv6 is written in hexadecimal notation, separated into 8 groups of 16 bits by the colons, thus (8 x 16 = 128) bits in total.
Double colon. Specify IPv6 addresses by using double colons ( :: ) in place of a series of zeros. For example, IPv6 address ff06:0:0:0:0:0:0:c3 can be written as ff06::c3 . Double colons can be used only once in an IP address.
An IPv6 (Normal) address has the following format: y : y : y : y : y : y : y : y where y is called a segment and can be any hexadecimal value between 0 and FFFF. The segments are separated by colons - not periods.
Host: Enumerate the interfaces with getifaddrs().
(edit) Looks like you need to call sysctl(NET_IPV6_OPT_DAD_ENABLE) before getifaddrs()?
http://lwn.net/Articles/218597/
Network: Send an ICMP ping is the typical but not fool proof method that DHCP servers use.
It is assumed if you are setting the IP then you are implementing a form of DHCP and you control all the addresses for that segment. Otherwise just use the link-local scope already unique addresses.
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You can read TENTATIVE flag of IPv6 Address as below:
Indicates flags that are set on the multicast address. As of RFC 2373, the only flag defined is the Transient (T) flag. The T flag uses the low-order bit of the Flags field.
* If 0, the multicast address is a permanently assigned, well-known multicast address allocated by the Internet Assigned Numbers Authority (IANA).
* If 1, the multicast address is a not permanently assigned, or transient.
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