[FS#964] odhcpdIPv6 node(Win 10) stops sending Router Solicitation but it still receives RAs from LEDE

[LEDE Bugs]

The following task has a new comment added:

FS#964 - odhcpdIPv6 node(Win 10) stops sending Router Solicitation but it still receives RAs from LEDE
User who did this - forfree (freefor)

----------
I attached the uci odhcpd debug log and a pcap (icmpv6 filter). Logs are in UTC timestamp (my timezone is UTC+2).

This is what I did:
1.Rebooted the router
2.Rebooted my windows machine
3.Started wireshark
4.Opened facebook and confirmed it was connected via IPv6 (chrome extension)
5.Left the computer at facebook's homepage. UTC 11:22
6.Checked my IPv6 default gateway and it was gone. UTC 14:31

My windows machine still has an IPv6 address, IPv6 DNS but no default gateway.
While I am writing this comment, the IPv6 default gateway is still missing.

I checked also the lifetime on my windows machine using netsh and it never goes under 5 minutes.

Thank you for your time.
----------

One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=964#comment3257