* Paul de Weerd <[EMAIL PROTECTED]> [2008-08-21 13:48]: > On Thu, Aug 21, 2008 at 09:50:35AM +0000, Stuart Henderson wrote: > | > you can stack vlans. aka > | > > | > ifconfig vlan2 vlan 2 vlandev em0 > | > ifconfig vlan4 vlan 4 vlandev vlan2 > | > > | > | I think you have to take a hit on MTU, so this is probably better > | on gigabit interfaces that are configured for jumbo frames (using > | ifconfig to increase MTU configures them for jumbos). > | > | Cisco does something similar (qinq) but iirc they use a different > | ethertype, so it may not be directly compatible. > > The standard specifies 0x88a8 for 'qinq' or 'stacked vlans' or > 802.1ad (Provider Bridges). OpenBSD uses 0x8100 for both the outer and > the inner ethertype (which may give interoperability issues with other > vendors, don't know, don't have gear that supports it). > > Attached is a patch that adds ETHERTYPE_8021AD to ethertypes.h.
no point in just doing that. a button to change the ether type would make sense. -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam
