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From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Geoff Roberts <geoff@apro.com.au>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Configuring VLANs - Why is IP address require on NIC connected
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> done using ifconfig_em0_name="ext0" in rc.conf.
>
> I find I have to give the ext0 interface an IP address in order for routing
> and packet filtering to work on the attached VLANs.

You have to set up IP address to vlans, not main interface. It's the way 
vlan's work.

Having 2 vlan's is like having 2 ethernet cards, while physically having 
one. switch is responsible to segregate your traffic and connect one 
"virtual ethernet" to right clients, and second to other clients - exactly 
how you configured switch.