From: Ruslan Ermilov [mailto:ru_at_FreeBSD.org] > On Tue, Oct 12, 2004 at 08:32:38AM -0400, Don Bowman wrote: > > Roub?cek Zdenek: > > > > > > Hello current > > > > > > I have run into a problem with my Broadcom NIC (Dell > > > LATITUDE D600). I am not able to detect 802.1Q tags on > > > incoming interface with ethereal or tcpdump. All incoming > > > packets seems like they are not coming through trunk but as > > > native ETH frames, ie. the vlan tag is missing, probably > > > removed before being passed to tcpdump? > > > > ... > > > > 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. > > > 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_at_ promised to fix this bug. > > 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. 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.Received on Tue Oct 12 2004 - 11:24:17 UTC
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