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Date:	Thu, 03 Apr 2014 01:46:31 +0900
From:	Toshiaki Makita <>
To:	Albert Krenz <>
Subject: Re: Cannot delete entries from bridge fdb

On Wed, 2014-04-02 at 11:25 +0200, Albert Krenz wrote:
> Hello everyone,
> i have a question concerning the forwarding database (fdb) of the
> bridges. I am using:
> - Ubuntu 13.10
> - kernel 3.11.0 from ubuntu repos
> - bridge utility 0.0 from iproute2 package
> - bridge-utils 1.5
> I have 3 applications, each one creating a tap (tap0 - tap2) which i
> add to the bridge br0. Two Applications are receiving Frames (app0 and
> app1) and the third one (app2) sends one Frame every second to app0.
> SRC and DST MAC are different from the tap MAC's. App0 sends an answer
> to app2 and the bridge adds an entry to his fdb with the MAC of app0
> on tap0.
> Now i wanted to delete this entry which does not work. RTNETLINK tells
> me there is no file or directory. See the following example:
> root@...c:~# bridge fdb show dev tap0
> 33:33:00:00:00:01 self permanent
> 01:00:5E:00:00:01 self permanent
> 40:EC:F8:03:A7:B5 vlan 0
>               << i want to delete this one
> 9A:0D:06:68:5D:75 vlan 0 permanent
>          << MAC of tap0
> root@...c:~# bridge fdb del 40:EC:F8:03:A7:B5 vlan0 dev tap0
> RTNETLINK answers: No such file or directory

Please try this command.
# bridge fdb del 40:EC:F8:03:A7:B5 dev tap0 master

Toshiaki Makita

> If i add a random entry i can delete it without any problem.
> root@...c:~# bridge fdb add 40:EC:F8:03:A7:FF vlan0 dev tap0
> root@...c:~# bridge fdb del 40:EC:F8:03:A7:FF vlan0 dev tap0
>                 << this works
> Is there another syntax to delete entries which the bridge has added
> by himself? Or is it not possible to delete entries which you haven't
> added by hand?
> greetings
> Albert Krenz
> --
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