From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4CF8BB08.7040601@free.fr> Date: Fri, 03 Dec 2010 10:40:24 +0100 From: =?windows-1252?Q?Nicolas_de_Peslo=FCan?= MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset="windows-1252"; format="flowed" Content-Transfer-Encoding: quoted-printable Subject: Re: [Bridge] bridge problem with with ICMP fragment reassembly List-Id: Linux Ethernet Bridging List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Shawn Delaney Cc: "bridge@lists.linux-foundation.org" Le 02/12/2010 23:19, Shawn Delaney a =E9crit : > Hi, > I have a bridge (br0) with two enslaved interfaces (int0 and ext0). From > the ext0 side, with a windows device, I ping with packet size 1932: > ping =96n 1 =96l 1932 10.64.160.94 > ping request and reply is bridged. > Now if I do the same with packet size 1933: > ping =96n 1 =96l 1933 10.64.160.94 > the request never seems to make it to the bridge interface > If I sniff the ping from the windows device on the ext0 side, I see two > frames sent, request + fragment, as expected. > In the working case, if I sniff ext0 on the bridge device I see the same > two frames received. > In the working case, if I sniff br0 on the bridge I see one frame (I > assume the bridge reassembles the request + fragment). > In the non working case, if I sniff ext0 on the bridge device I see the > same two frames received. > In the non working case, if I sniff br0 I see nothing. > It seems there is a bug with bridging and reassembly of packets or > fragments of a certain size, and am wondering If there is a patch. Bridges are not expected to change frames in any way. This is not specific = to the bridging function=20 of Linux. No reassembly occurs at the bridge level. If one host send two frames, the = bridge will forward two=20 frames. By the way, it means that the MTU for all interfaces of the bridge should b= e identical. Nicolas. > The MTU of all interfaces is 1500. > I am using connection tracking. > The problem is seen on kernels 2.6.11 and 2.6.24 > Any help would be much appreciated. > Regards, > Shawn > > > > _______________________________________________ > Bridge mailing list > Bridge@lists.linux-foundation.org > https://lists.linux-foundation.org/mailman/listinfo/bridge