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External
Since: Mar 03, 2007
Posts: 1
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(Msg. 1) Posted: Wed Aug 22, 2007 9:47 pm
Post subject: binding + autoconfig
Archived from groups: linux>debian>maint>ipv6 (more info?)
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Hi,
I bonded together two Ethernet interfaces, and if I keep restarting
networking, the bond interface sometimes does, but mostly does not get
its global prefix from the router. The two physical interfaces and
the bond share a MAC, and accordingly also share their link-local
addresses. I've got the impression that the bond gets its global
address only if the right interface is activated in the bond first,
but I haven't checked this rigorously yet. Any thoughts on this?
On the other hand, I could live without autoconfiguration complicating
my life. How could I disable that?
/proc/sys/net/ipv6/conf/*/autoconf and accept_ra are already all set
to 0, but a networking restart still gets me link-local addresses...
--
Regards,
Feri.
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External
Since: Dec 20, 2006
Posts: 251
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(Msg. 2) Posted: Thu Aug 23, 2007 5:47 am
Post subject: Re: binding + autoconfig [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Thu, Aug 23, 2007 at 04:06:06AM +0200, Wagner Ferenc wrote:
> /proc/sys/net/ipv6/conf/*/autoconf and accept_ra are already all set
> to 0, but a networking restart still gets me link-local addresses...
You cannot disable that. It's also not part of routing advertisement --
even if you have no working IPv6 setup but you do have the ipv6 module
loaded, you will have a link-local address. It's the kernel that
generates the link-local address, not the routing advertisement or
anything.
--
<Lo-lan-do> Home is where you have to wash the dishes.
-- #debian-devel, Freenode, 2004-09-22
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External
Since: Feb 27, 2007
Posts: 42
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(Msg. 3) Posted: Thu Aug 23, 2007 7:47 am
Post subject: Re: binding + autoconfig [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Wouter Verhelst <wouter DeleteThis @debian.org> writes:
> On Thu, Aug 23, 2007 at 04:06:06AM +0200, Wagner Ferenc wrote:
>> /proc/sys/net/ipv6/conf/*/autoconf and accept_ra are already all set
>> to 0, but a networking restart still gets me link-local addresses...
>
> You cannot disable that. It's also not part of routing advertisement --
> even if you have no working IPv6 setup but you do have the ipv6 module
> loaded, you will have a link-local address. It's the kernel that
> generates the link-local address, not the routing advertisement or
> anything.
Eh, that was a desperate last ditch attempt after setting autoconf to
zero didn't help. What's controlled by autoconf, then? Thanks for
the reply, anyway.
--
Regards,
Feri.
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External
Since: Feb 12, 2007
Posts: 31
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(Msg. 4) Posted: Thu Aug 23, 2007 7:47 am
Post subject: Re: binding + autoconfig [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Thu, Aug 23, 2007 at 01:42:58PM +0200, Ferenc Wagner wrote:
> Wouter Verhelst <wouter RemoveThis @debian.org> writes:
>
> > On Thu, Aug 23, 2007 at 04:06:06AM +0200, Wagner Ferenc wrote:
> >> /proc/sys/net/ipv6/conf/*/autoconf and accept_ra are already all set
> >> to 0, but a networking restart still gets me link-local addresses...
> >
> > You cannot disable that. It's also not part of routing advertisement --
> > even if you have no working IPv6 setup but you do have the ipv6 module
> > loaded, you will have a link-local address. It's the kernel that
> > generates the link-local address, not the routing advertisement or
> > anything.
>
> Eh, that was a desperate last ditch attempt after setting autoconf to
> zero didn't help. What's controlled by autoconf, then? Thanks for
> the reply, anyway.
if you have route advertisement running on your network, your
globally-valid IP address that's generated automatically...
if you provide the output of 'ip addr show', I could tell you which one.
--
<Lo-lan-do> Home is where you have to wash the dishes.
-- #debian-devel, Freenode, 2004-09-22
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External
Since: Feb 27, 2007
Posts: 42
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(Msg. 5) Posted: Thu Aug 23, 2007 10:47 am
Post subject: Re: binding + autoconfig [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Wouter Verhelst <w.DeleteThis@uter.be> writes:
> On Thu, Aug 23, 2007 at 01:42:58PM +0200, Ferenc Wagner wrote:
>
>> What's controlled by autoconf, then?
>
> if you have route advertisement running on your network, your
> globally-valid IP address that's generated automatically...
Thanks for the info, that clears it up. What's more, finally I found
the docs in ip-sysctl.txt. 
Now to make sure I'm not mistaken: the link-scope IPv6 address of my
bond interface is flagged tentative. This is probably because its
slave devices also have the same MAC, thus the same link-scope IPv6
address, so the kernel level autoconfiguration fails at the uniqeness
check. Right? It's not stable, though: often I end up with three
identical IPv6 addresses on the tree interfaces.
--
Regards,
Feri.
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External
Since: Feb 12, 2007
Posts: 31
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(Msg. 6) Posted: Thu Aug 23, 2007 4:47 pm
Post subject: Re: binding + autoconfig [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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On Thu, Aug 23, 2007 at 04:45:06PM +0200, Ferenc Wagner wrote:
> Wouter Verhelst <w.TakeThisOut@uter.be> writes:
> > On Thu, Aug 23, 2007 at 01:42:58PM +0200, Ferenc Wagner wrote:
> >> What's controlled by autoconf, then?
> > if you have route advertisement running on your network, your
> > globally-valid IP address that's generated automatically...
>
> Thanks for the info, that clears it up. What's more, finally I found
> the docs in ip-sysctl.txt.
>
> Now to make sure I'm not mistaken: the link-scope IPv6 address of my
> bond interface is flagged tentative. This is probably because its
> slave devices also have the same MAC, thus the same link-scope IPv6
> address, so the kernel level autoconfiguration fails at the uniqeness
> check. Right?
No clue, but it sounds not too far-fetched, so it could be true. Hey, I
don't know everything 
> It's not stable, though: often I end up with three
> identical IPv6 addresses on the tree interfaces.
That sounds like a race somewhere, then. If you don't need these
link-local addresses, I wouldn't worry about it.
--
<Lo-lan-do> Home is where you have to wash the dishes.
-- #debian-devel, Freenode, 2004-09-22
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