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Windows 10 - IPv6 resume from sleep

Alastair Grant | Tuesday 13 October 2015

I haven't got an answer for this one yet.

It seems when my PC resumes from sleep it (sometimes?) can't connect to IPv6 addresses out on the net. The cause seems to be down to routers and neighbour discovery. This command will list your IPv6 neighbours, and which ones are routers:

netsh interface ipv6 show neighbors

Mine gives me a type of "Stale (Router)" next to my gateway.

It seems, I can kick Windows into life merely by pinging the router address "ping -6 [router]". Repeating the netsh command above will show the router as Reachable, and IPv6 is working.

Doing a trace before the fix, Windows tries to go out directly and is skipping the router at all - naturally, this doesn't work. The ping sorts it out and it starts going out the correct way.

If you happen to know the answer, please let me know!

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