Does NetworkManager kill IPv6 connections?

Does NetworkManager kill IPv6 connections?

[David Laight]

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

Re: Does NetworkManager kill IPv6 connections?

[Daniel Borkmann]

[ Cc'ing Dan ]

On 09/04/2014 04:47 PM, David Laight wrote:
> 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

Re: Does NetworkManager kill IPv6 connections?

[Dan Williams]

On Thu, 2014-09-04 at 14:47 +0000, David Laight wrote:
> 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.

Is the version of the Ubuntu "network-manager" package on your systems
0.9.8.0-0ubuntu6.1?

If so, I know we've fixed a ton of issues with IPv6 since 0.9.8.0 (which
was released about 18 months ago), and the ones that may be affecting
you are related to router advertisement timing and expiry.  The latest
stable NM version upstream is 0.9.10 and should contain all of those
fixes.

Since I'm pretty sure this isn't a kernel problem, would you mind
discussing this over on the NM lists here:

https://mail.gnome.org/mailman/listinfo/networkmanager-list

If you don't want to subscribe that's fine, I'll moderate your message
through and we can just use "reply all".

Thanks,
Dan

> 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
> 
> 
> 
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

RE: Does NetworkManager kill IPv6 connections?

[David Laight]

From: Dan Williams 
> On Thu, 2014-09-04 at 14:47 +0000, David Laight wrote:
> > 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.
> 
> Is the version of the Ubuntu "network-manager" package on your systems
> 0.9.8.0-0ubuntu6.1?

It is actually the slightly older 0.9.8.0-0ubuntu6.0

> If so, I know we've fixed a ton of issues with IPv6 since 0.9.8.0 (which
> was released about 18 months ago), and the ones that may be affecting
> you are related to router advertisement timing and expiry.  The latest
> stable NM version upstream is 0.9.10 and should contain all of those
> fixes.

I've flagged it with our management, they'll decide what to say
about IPv6 support in various Linux distros.

	David

> Since I'm pretty sure this isn't a kernel problem, would you mind
> discussing this over on the NM lists here:
> 
> https://mail.gnome.org/mailman/listinfo/networkmanager-list
> 
> If you don't want to subscribe that's fine, I'll moderate your message
> through and we can just use "reply all".
> 
> Thanks,
> Dan
> 
> > 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
> >
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe netdev" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: Does NetworkManager kill IPv6 connections?

[Dan Williams]

On Fri, 2014-09-05 at 14:18 +0000, David Laight wrote:
> From: Dan Williams 
> > On Thu, 2014-09-04 at 14:47 +0000, David Laight wrote:
> > > 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.
> > 
> > Is the version of the Ubuntu "network-manager" package on your systems
> > 0.9.8.0-0ubuntu6.1?
> 
> It is actually the slightly older 0.9.8.0-0ubuntu6.0
> 
> > If so, I know we've fixed a ton of issues with IPv6 since 0.9.8.0 (which
> > was released about 18 months ago), and the ones that may be affecting
> > you are related to router advertisement timing and expiry.  The latest
> > stable NM version upstream is 0.9.10 and should contain all of those
> > fixes.
> 
> I've flagged it with our management, they'll decide what to say
> about IPv6 support in various Linux distros.

Ok, keep me (and the NM upstream) in the loop depending on what gets
decided.  Like I said, subsequent stable versions of NetworkManager in
recent distros have much improved IPv6 support, and if you have a chance
to try it out and let me know how it goes, that would be awesome.

Dan

> 	David
> 
> > Since I'm pretty sure this isn't a kernel problem, would you mind
> > discussing this over on the NM lists here:
> > 
> > https://mail.gnome.org/mailman/listinfo/networkmanager-list
> > 
> > If you don't want to subscribe that's fine, I'll moderate your message
> > through and we can just use "reply all".
> > 
> > Thanks,
> > Dan
> > 
> > > 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
> > >
> > >
> > >
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe netdev" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > 
>