Thanks for your replies. We contacted Arris (manufacturer of our CMTS) about this issue with links to relevant parts of specification about minimum size of VLAN tagged frames and it seems they'll acknowledge the problem and fix it in next firmware.
Meantime i tried different suggestions posted there (patch from Chris, replacing ETH_ZLEN with VLAN_ETH_ZLEN in e1000_main.c and disabling HW VLAN tagging in netdev->features) and combinations of them, but none of it worked and 64B VLAN frames are still generated by our intel NIC. I'll now consider this issue as closed on the e1000 and intel NIC side, because there was no problem with them in the first place, and I'll rather concentrate on resolving it on the CMTS side which doesn't act according to specs. Cheer Emil. - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
