em driver + VLAN's

[Doug Ambrisko]

Sten Spans writes:
| On Wed, 18 Jan 2006, Doug Ambrisko wrote:
| > Dave Raven writes:
| > | FreeBSD 4.9 - char em_driver_version[] = "1.7.16";
| > |
| > | I've tried multiple bridge configurations - from bridging just em0,em1 to
| > | bridging two vlan's attached to each card. Unfortunately I don't have access
| > | to the box at the moment - if its still necessary I will fetch the
| > | information tomorrow (ifconfig etc)
| > |
| > | To sum up its something like the following
| > | 	net.inet.ether.bridge_config=em0,em1
| > | 	net.inet.ether.bridge=1
| > |
| > | Or vlan0,vlan1 with:
| > | 	ifconfig vlan0 create
| > | 	ifconfig vlan1 create
| > | 	ifconfig vlan0 vlan 100 vlandev em0
| > | 	ifconfig vlan1 vlan 100 vlandev em1
| > |
| > |
| > | If I change to using fxp it immediately works..
| >
| > I think you will find you are bridging in promiscous mode and the
| > HW VLAN stuff isn't there.  You should try to bridge the vlan devices
| > or disable the VLAN HW (driver hack).  It works with the fxp0 since you
| > are using SW VLAN so the HW part isn't grabing it.  I've done the driver
| > hack for some things I needed to do.
| 
| what about vlanhwtag (ifconfig) ?
| according to the em manpage it is disabled by default
| so this setup should work.

I'm not sure ... things have changed over time.

Doug A.