From: Hugo van Niekerk (hugovancontrolability.com.au)
Date: Wed Aug 01 2007 - 21:18:52 CDT

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Hey Everybody

Im running OpenBSD 3.9. At startup during vlan initialization I get
an error that the vlan initiated with a nonstandard mtu of 1946
(parent pcn1). Of course I understand that a vlan header has to be
sent and that provision has to be made for this. Ive done a lot of
searching on the web around this and everything is pointing to the
fact that the network driver does not support / has not been set for
a larger mtu. This is where I get stuck. There is a component
SIOCIFMTU that reports that the mtu value I use is incorrect for a
specific interface when I try to increase the mtu from the command
line using ifconfig. This component, according to my research sets
the mtu value automatically at startup based on the information that
is fed to it by the network card driver. Anything above what is set
at startup would be invalid. Can anybody please give me some advise
as to where I can more resources that I can research to resolve this
problem or point me in the right direction. I would really
appreciated this! Also, I've been looking for a guide or good book /
resource around configuring vlans on OpenBSD, I thought maybe I made
a mistake in the hostname.if and pf.conf files. Again any assistance
here will be greatly appreciated.

regards

Hugo

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