IPv6 unexpected dual temporary addresses

[epopen]

Hi All.

My FreeBSD box using dual stack IPv6 with Privacy Extensions (net.inet6.ip6.use_tempaddr: 1) @ WAN NIC example below

inet6 OLD prefixlen 64 deprecated autoconf temporary
inet6 1ST_NEW prefixlen 64 autoconf temporary

And filter out 1ST_NEW IPv6 address and feed into DNS server by dns/ddclient with scan WAN NIC per 5 minutes periodically and filter condition as below
/usr/bin/sed -e '/temporary/\!d ;/deprecated/d'

A day, my FreeBSD box can not access from internet by IPv6.
And checked WAN NIC as below.

inet6 OLD prefixlen 64 deprecated autoconf temporary
inet6 1ST_NEW prefixlen 64 autoconf temporary  <- Ping NG from internet
inet6 2ND_NEW prefixlen 64 autoconf temporary <- Ping OK from internet

Unexpected dual temporary addresses found.
No idea how to fix, fixed by reboot.

Root cause is dns/ddclient filter out 1ST_NEW of NG address and access failed from internet .

Question:

• Only one temporary addresses per NIC I think.
  But dual exist in my case, something wrong?
• Temporary addresses generate in kernel known.
  Possible trigger / add hook to notify and pass valid address to user space application/script like dns/ddclient when valid address available?

Thanks a lot.
Neko

 

[epopen]

Hi All.

Update: Today new weird IPv6 address found as below

        inet6 2001:b011:a480:40a0:8043:e654:7b55:d566 prefixlen 64 detached autoconf temporary
        inet6 2001:b011:a480:4a6e:8043:e654:7b55:d566 prefixlen 64 autoconf temporary
        inet6 2001:b011:a480:42ee:8043:e654:7b55:d566 prefixlen 64 autoconf temporary

Not only dual temporary addresses but also detached marked address, both can not ping

Thanks a lot.