Subject: Re: kern/32900
To: None <,,>
From: Christos Zoulas <>
List: netbsd-bugs
Date: 02/22/2006 10:28:34
On Feb 22,  2:50pm, (Nino Dehne) wrote:
-- Subject: Re: kern/32900

|  Can this apply even when the switch is 802.1Q-compliant? I've been using
|  that switch and VLANs for some time now and never noticed anything like
|  this. The switch certainly wasn't cheap in the sense of inexpensive. :)
|  I also tested the whole setup with an even more advanced switch (D-Link
|  DES-3225G) which provides sophisticated traffic and error statistics per
|  port and couldn't see any errors on the participating ports. The problem
|  still persisted.
|  Also, why doesn't this apply to packets that merely pass the router and
|  are not originating from it?
|  The vlan(4) man page says
|    vlan can be used with devices not supporting the IEEE 802.1Q MTU, but
|    then the MTU of the vlan interface will be 4 bytes too small and will not
|    interoperate properly with other IEEE 802.1Q devices, unless the MTU of
|    the other hosts on the VLAN are also lowered to match.
|  However, sip(4) is listed as being supported.
|  I'm at a loss now and still think this is a bug somewhere.

If you are certain that the problem is not in the switch then it can
certainly be a bug in the sip driver. Do you have another card to test