From: Ben Greear <greearb@candelatech•com>
To: Erik Hugne <erik.hugne@ericsson•com>
Cc: netdev@vger•kernel.org, kaber@trash•net, ataschner@suse•com
Subject: Re: [MacVLAN] failure to deliver reassembled IPv6 multicast traffic
Date: Fri, 15 Feb 2013 11:07:12 -0800 [thread overview]
Message-ID: <511E8760.9070703@candelatech.com> (raw)
In-Reply-To: <20130215170028.GG12219@eerihug-hybrid.ki.sw.ericsson.se>
On 02/15/2013 09:00 AM, Erik Hugne wrote:
> If macvlan's are configured on a device, IPv6 multicast
> traffic received on the underlying ethernet device is not
> delivered properly to higher layers. Large amounts of packets are lost, and
> the problem seems to get worse the more macvlans are defined
> on top of the device, up to the point where no traffic is delivered
> at all...
>
>
> Steps to reproduce (2 hosts required)
> On host 1, set up some macvlans:
> ip link add link eth0 name macvlan0 type macvlan mode bridge
> ip link add link eth0 name macvlan2 type macvlan mode bridge
> ip link add link eth0 name macvlan3 type macvlan mode bridge
> ip link set link dev macvlan0 up
> ip link set link dev macvlan2 up
> ip link set link dev macvlan3 up
>
> Start a server that binds to ff02::1 scoped to eth0
> ./server6 -sff02::1 -eeth0
>
>
> On host 2:
> ./client6 -dff02::1 -eeth0
>
>
> This seems to only occur for large (fragmented) IPv6 multicast traffic.
> If you bind to :: instead (-s:: on the server) and send to
> the linklocal address of Host1/eth0, packets are delivered just fine.
This has been around for a long time, maybe forever. Last time
we looked at this it did not appear there was an easy fix, something
to do with how UDP packets are re-assembled....
Thanks,
Ben
--
Ben Greear <greearb@candelatech•com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2013-02-15 19:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-15 17:00 [MacVLAN] failure to deliver reassembled IPv6 multicast traffic Erik Hugne
2013-02-15 18:08 ` Eric Dumazet
2013-02-15 19:07 ` Ben Greear [this message]
2013-02-15 19:18 ` Eric Dumazet
2013-02-15 19:27 ` Ben Greear
2013-02-15 19:35 ` Eric Dumazet
2013-02-16 2:25 ` Vlad Yasevich
2013-02-16 2:57 ` Vlad Yasevich
2013-02-16 8:48 ` Erik Hugne
2013-02-19 22:22 ` Ben Greear
2013-02-19 22:37 ` Ben Greear
2013-02-19 22:38 ` Eric Dumazet
2013-02-19 22:47 ` Ben Greear
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