Configuring VLANs - Why is IP address require on NIC connected to Trunk?

[Nikos Vassiliadis]

Geoff Roberts wrote:
> 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.
> 
> a) Is there a way to configure this so that I don't have to give ext0 an IP 
> address?

Yes, you just have to "up" the interface:
ifconfig_em0="up"