em(4) VLAN + PROMISC still doesn't work with latest CVS version

[Robert Watson]

On Sat, 27 Nov 2004, Kevin Day wrote:

> I recently upgraded to 5.3 on a system, and manually upgraded
> src/sys/dev/em/* to the latest RELENG_5 versions. (1.44.2.4 of if_em.c) 

I'm able to reproduce problems using the below configuration is 6.x also,
and am investigating.  Thanks for the report, hope to get back to you
shortly with something concrete.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert at fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> While the VLAN side of things works better than the stock 5.3 version,
> there still is this problem: 
> 
> 
> ifconfig vlan1 create
> ifconfig vlan1  vlan 1    vlandev em1 link0
> ifconfig vlan2 create
> ifconfig vlan2  vlan 2    vlandev em1 link0
> ifconfig vlan3 create
> ifconfig vlan3  vlan 3    vlandev em1 link0
> 
> ifconfig vlan1 inet 192.aaa.bbb.129 netmask 255.255.255.0
> ifconfig vlan2 inet 64.ccc.ddd.61 netmask 255.255.255.192
> ifconfig vlan3 inet 64.eee.fff.61 netmask 255.255.255.192
> 
> ifconfig em1 up
> ifconfig em1 promisc
> 
> If I do this, vlan1 and vlan3 work fine. Vlan2 can receive packets, but 
> anything sent out vlan2 doesn't seem to be heard by any foreign hosts. 
> Setting "ifconfig em1 -promisc" makes all vlans work properly.
> 
> This is better than the stock 5.3 version of em(4) where none of the 
> vlans worked, but something still isn't right.
> 
> Is this a known problem still or am I just doing something wrong?
> 
> 
> 
>