freebsd stable - Nov 2010 - e1000 + vlan = connection lost after ifconfig + vlanid + vlandev

Hi, I noticed that *something has changed* regarding vlan creation since 8.0-rel
and 7.1-rel, compared to 8.1-rel / 7-stable

When creating a vlan under 8.1-rel (csup'ed the sources yesterday), the box
looses all connectivity

I'm using the following cards:
em0@pci0:1:0:0:	class=0x020000 card=0x10d315d9 chip=0x10d38086 rev=0x00 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Intel 82574L Gigabit Ethernet Controller (82574L)'

I was used to create my vlan with the following (works on 8.0 and 7.1):
	ifconfig vlan0 create
	ifconfig vlan0 10.0.0.1 netmask 255.0.0.0 vlan 1234 vlandev em0
	<connectivity lost>

Now I don't have the proper knowledge to say *what* changed and *why*, but I
did manage to find a possible fix (with a little inspiration, thanks Darius)

At some point, I realized the kernel wasn't panic'ing, since my
'sleep 200 && reboot &' command, issued before the ifconfig,
was executed, and the box was indeed rebooting after 200 secs

... Bottom line, is we realized a simple "ifconfig em0 down" than
"ifconfig em0 up" would fix the issue !

So i made a simple script for /usr/local/etc/rc.d/000.vlan.sh enclosed below

I'm still wondering if there isn't a cleaner way to do this via rc.conf
...

But at least, it's a working fix-of-the-poor

Home this can still help someone

Ps: sorry if this is the wrong place to post this info, that's my very first
humble contribution

Rud.



000.vlan.sh :
-----
#!/bin/sh

ip=10.0.0.1
mask=255.0.0.0
vlanid=1234
vlandev=vlan0
cloneddevice=em0

case $1 in
       start)
               log=/var/log/vlan.log
               touch $log
               ifconfig $vlandev create >> $log
               ifconfig $vlandev $ip netmask $mask vlan $vlanid vlandev
$cloneddevice >> $log
               ifconfig $cloneddevice down >> $log
               ifconfig $cloneddevice up >> $log
# for debug ...
# mv /usr/local/etc/rc.d/000.vlan.sh /root/000.vlan.sh && sleep 800
&& reboot &
       ;;                                                                   
       stop)                                                                
       ;;                                                                   
esac

On Monday, November 22, 2010 9:09:17 pm Rudolph Sand
wrote:
> Hi, I noticed that *something has changed* regarding vlan creation since
8.0-rel and 7.1-rel, compared to 8.1-rel / 7-stable
> 
> When creating a vlan under 8.1-rel (csup'ed the sources yesterday), the
box looses all connectivity
Yes, this has to do with changes to the driver to fix bugs in its VLAN
hardware filter.  If you grab the latest 8-stable it should be back to
working fine by default.  If you enable 'vlanhwfilter' via ifconfig you
will
loose link when adding or removing vlan's again.

-- 
John Baldwin