Date: Tue, 12 Oct 2004 16:32:58 +0300 From: Ruslan Ermilov <ru@freebsd.org> To: Don Bowman <don@sandvine.com> Cc: Gleb Smirnoff <glebius@freebsd.org> Subject: Re: Broadcom bge and 802.1Q vlan tags Message-ID: <20041012133258.GA84905@ip.net.ua> In-Reply-To: <A8535F8D62F3644997E91F4F66E341FC9E34F8@exchange.sandvine.com> References: <A8535F8D62F3644997E91F4F66E341FC9E34F8@exchange.sandvine.com>
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--45Z9DzgjV8m4Oswq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Oct 12, 2004 at 09:24:15AM -0400, Don Bowman wrote: > From: Ruslan Ermilov [mailto:ru@FreeBSD.org] > > On Tue, Oct 12, 2004 at 08:32:38AM -0400, Don Bowman wrote: > > > Roub?cek Zdenek: > > > >=20 > > > > Hello current > > > >=20 > > > > I have run into a problem with my Broadcom NIC (Dell=20 > > > > LATITUDE D600). I am not able to detect 802.1Q tags on=20 > > > > incoming interface with ethereal or tcpdump. All incoming=20 > > > > packets seems like they are not coming through trunk but as=20 > > > > native ETH frames, ie. the vlan tag is missing, probably=20 > > > > removed before being passed to tcpdump? > > >=20 > > > ... > > >=20 > > > do you have if_vlan loaded? try 'kldload if_vlan'. > > > This happens automatically if you create a vlan interface, but > > > you may not have one if you are just sniffing. > > >=20 > > There appears to be a bug with drivers that support VLAN tag > > striping in hardware in case no VLAN interfaces are configured. > > In this case, ether_demux() will just proceed like if it was > > an untagged Ethernet frame. glebius@ promised to fix this bug. > >=20 > > Zdenek, unfortunately, the bge(4) driver doesn't allow the > > user to disable hardware vlan tag striping (like, e.g., the > > em(4) driver allows), so you cannot watch VLAN frames on this > > box using tcpdump or ethereal. >=20 > I believe you can work around it by creating a vlan interface, > even if not connected. > that is, if its the same bug that i've run into with em. >=20 Yes, sure. But you still won't be able to see the VLAN frame in this case (because VLAN information is stripped in h/w). Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --45Z9DzgjV8m4Oswq Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFBa90KqRfpzJluFF4RAuqPAJ4/3+eq3lqN/weXCSt7uhw6xa7q9wCgkLDZ aMsCV8i+k/pbvhInTuX4cR8= =tzc3 -----END PGP SIGNATURE----- --45Z9DzgjV8m4Oswq--
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