Linux Ethernet Bridging - Feb 2010 - [Bridge] NTP packets not passing the bridge

Hello.

I have a simple testsetup, where <node> --- | bridge | --- <node> is
connected.

Every packets seems to traverse the bridge, except for the NTP packets.

When capturing on the in-port, what differes for this NTP packets is that there
src-mac address is 00:00:00:00:00:00.
Where any other packets has valid src address.

Is there a check/validation in the bridge so that it will not pass eth-packets
that has a src with all 0.

The kernel used is "2.6.31.5-0.1"

brg/Martin


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On Tue, 16 Feb 2010 11:58:26 +0100
Martin Andersson Z <martin.z.andersson at ericsson.com> wrote:
> Hello.
> 
> I have a simple testsetup, where <node> --- | bridge | ---
<node> is connected.
> 
> Every packets seems to traverse the bridge, except for the NTP packets.
> 
> When capturing on the in-port, what differes for this NTP packets is that
there src-mac address is 00:00:00:00:00:00.
> Where any other packets has valid src address.
> 
> Is there a check/validation in the bridge so that it will not pass
eth-packets that has a src with all 0.
> 
Yes.  all-zeros is not a valid ethernet device address.
Find and fix the hardware that is sending it.

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