Re: em, vlan and pf troubles

From: Max Laier (max_at_love2party.net)
Date: 12/01/04

  • Next message: Mike Wolman: "Re: em, vlan and pf troubles" 
    To: freebsd-net@freebsd.org
Date: Wed, 1 Dec 2004 19:06:16 +0100

    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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  • Next message: Mike Wolman: "Re: em, vlan and pf troubles"

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