netdev - Does NetworkManager kill IPv6 connections?

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D174876CB@AcuExch.aculab.com>
Date:	Thu, 4 Sep 2014 14:47:09 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Does NetworkManager kill IPv6 connections?

I was running a overnight test that failed because an (almost idle) IPv6 connection
unexpectedly disconnected.
30 seconds before the disconnect syslog contains (retyped):
  NetworkManager[pid]: <info> policy set 'Wired connection 2' (eth0) as default for IPv6 routing and DNS.
The same message appeared exactly 70 minutes earlier - with no ill effect.
A second connection between the same pair if addresses (carrying a lot of traffic)
was unaffected.

Any idea what/why NetworkManager is doing?
(Yes I know it is userspace, but it seems to be breaking the kernel....)

The system is an ubuntu 13.04 desktop (3.8.0-19 kernel), that recent, but
newer than the ones a lot of our customers use.

I can rerun the test, but don't know what to look for.
'eth0' is the only ethernet interface in the system that is actually
connected to a network.

Some indications of where to look would be appreciated.

	David

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