Hi Max,
No dhcp stuff is running on this box as a client or server on any interfaces.
I can confirm running tcpdump does "mess" vlan stuff up.
I am reluctant to try the updates as on: http://marc.theaimsgroup.com/?l=freebsd-net&m=110172867801777&w=2 as we have a lot more than 3 vlans and the box is in use.
However i am willing to give it a go if it helps, is it as simple as grabbing the latest cvs files from src/sys/dev/em/* and doing a make buildkernel or do other parts of the tree need updating?
Also i have had a look through the docs for the em driver but cannot
see how to disable the hardware vlan tagging - does anybody know of is this possible?
Mike.
On Wed, 1 Dec 2004, Max Laier wrote:
On Tuesday 30 November 2004 22:17, Mike Wolman wrote:<...>Hi,
I am having a problem with 5.3 release with pf, vlans and the em device.I have had a hunt on the lists and found:
http://marc.theaimsgroup.com/?l=freebsd-net&m=110172867801777&w=2
From what I know about this problem, it is possible that trying to analyze to problem creates the problem in the first place. i.e. if you tcpdump on the em-card (or the vlan for the same reason) it will screw up the vlan hardware support. A fix has been committed, but it might be the case that the fix wasn't 100% correct (esp. when there are 3+ vlans on the interface).
Is is possible that you switched to dhcp for these boxes? If you run dhclient on em0 it will open a bpf-socket which seems to be the root of the em+vlan troubles. I doubt that pf plays a part in this game.
I am not sure if this is related but suspect it is - if so will adding a different card from a different vendor fix this? (the machine is at a remote location but if this will fix the problem off i go)
Using a card w/o hardware supported vlan tagging might help, but you obviously lose the benefit. I am not sure if you can turn off the h/w-support on the em-card, but that's sure worth a try. Tell us if it helpped.
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