Renew failed as bug 2836416
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suzsuz
The bug 2836416 said "I am using the latest (2008) source for the WIDE-DHCPv6 client. It appears that when you get a response to a Renew message it gets ignored because the ioctl call made via ifaddrconf() returns EEXIST which in turn causes update_address in addrconf.c to terminate early rather than update the lifetime values for the IA."
The problem fixed by attached patch.
Fix renew problem