~12 minute IPv6 outage starting around 06:52Z

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Author: Andy Smith
Date:  
To: announce
Subject: ~12 minute IPv6 outage starting around 06:52Z

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gpg: Signature made Wed May 31 07:37:35 2017 UTC
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gpg: Good signature from "Andy Smith <andy@strugglers.net>" [unknown]
gpg: aka "Andrew James Smith <andy@strugglers.net>" [unknown]
gpg: aka "Andy Smith (UKUUG) <andy.smith@ukuug.org>" [unknown]
gpg: aka "Andy Smith (BitFolk Ltd.) <andy@bitfolk.com>" [unknown]
gpg: aka "Andy Smith (Linux User Groups UK) <andy@lug.org.uk>" [unknown]
gpg: aka "Andy Smith (Cernio Technology Cooperative) <andy.smith@cernio.com>" [unknown]
Hi,

At around 06:52Z today we lost IPv6 connectivity for about 12
minutes. This was due to one of our colo provider's routers
crashing.

They run a redundant network so it should failover, and did for
IPv4, but we're experiencing some problems with IPv6 failover which
meant it took longer than we would like or find acceptable.

The same thing happened last Thursday and that time initially due to
a miscommunication we believed that v6 was down because of the
router failure, when in fact it was not expected under those
circumstances.

Since then I have been working to identify why v6 failover takes so
long and to improve it, but we are not there yet.

The router that died today is the same router which died last
Thursday. It had been up for over 4 years and so its failure last
week was deemed an aberration and it was power cycled.

I have now flipped routes around so the other router is first choice
for v6, but will continue to work on v6 failover.

Apologies for the disruption!

Cheers,
Andy

--
https://bitfolk.com/ -- No-nonsense VPS hosting
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