From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <45D3D99A.9050108@mattstone.net> Date: Thu, 15 Feb 2007 03:55:06 +0000 From: Matt Richards MIME-Version: 1.0 References: <45CE9940.2060501@mattstone.net> In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig378B8B0BF2850F67C3938D72" Subject: Re: [Bridge] bridge wont forward when ip address changes List-Id: Linux Ethernet Bridging List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Andy Gospodarek , bridge@lists.osdl.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig378B8B0BF2850F67C3938D72 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Andy Gospodarek wrote: > On 2/10/07, Matt Richards wrote: >> hello :) >> >> I have been using the bridge utils for a long time now and its been ve= ry >> good but there are a couple of issues that I came across when trying t= o >> setup a wireless bridge... >> >> Firstly I currently have a setup like the following ... >> >> Computer A --- Wired Network --- linux box ---- wireless link ------ >> linux box ----- Wired Network --- Computer B >> >> I have bridged the wireless interfaces and the wired interfaces togeth= er >> on both of the linux box's and data can travel across the wireless >> bridge without any trouble but if I attempt to change the IP addresses= / >> subnet of Computers A and B the bridges seem to stop forwarding packet= s >> and no data get through at all, its like they aren't learning the new >> addresses. >> >> If I restart the 2 Linux boxes then everything starts flowing properly= >> again. >> >> The 'Linux boxes' are a couple of Motorola Wireless Access points >> running OpenWRT. >> >> Does anybody know why this might be happening and what I might be able= >> to do about it? >> > > I wonder if this is ARP related? I've noticed some interesting > behavior when bridging wired and wireless devices. Have you noticed > that you can communicate after the IP switch if you send a gratuitous > ARP from any of the wireless devices? > hello, no i haven't tried tried that, i did notice that if i try to make a computer talk to another device after the ip change the arp table would contain the IP with an invalid state and no mac address or a mac address of all F's i think it was. Sending arp packets wouldn't be a solution as this will be used in a computer lab to connect sockets that are in parts of the room where its not easy to run cables and therefore wouldn't be ideal for people to use when learning about network operating systems. One thing I have just thought of, while reading an email from the openvpn mailing list, is that if i setup an openvpn tunnel with tap interfaces over the wireless link and bridge the switches to the tap interface then the problem should go away if it is to do with the wireless interfaces. Is a little weird tho, I had to lower to mtu to get the devices to ping in the first place. Matty. --------------enig378B8B0BF2850F67C3938D72 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFF09mdrmnybSDmzlsRAqwOAJ9r6IcpJfISFRm566A4+gxBE8pvQQCglMtU qutF2f6D3OvoQQ8N0fxP2zg= =ryZn -----END PGP SIGNATURE----- --------------enig378B8B0BF2850F67C3938D72--