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From: Michael Powell <nightrecon@hotmail.com>
Subject: Re: gre tunnel doesn't create
Date: Tue, 18 Feb 2014 14:56:46 -0500
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s m wrote:

> hello all
> 
> i have freebsd 9.2 which is customized. now when i want to create gre
> tunnel and run "ifconfig gre0 create" command, this error is shown:
> 
> ifconfig: SIOCIFCREATE2: Invalid argument
> 
> i check this command on a fresh freebsd 9.2 and it works so my changes
> cause this. i have many changes on my freebsd (install many services,
> optimize kernel and ...) and i need all of them. do you have any
> suggestion what change causes this error? or how can i fix it in order to
> be able to create a gre tunnel?
> 

Try and kldload the if_gre.ko module and see if that works. If so put 
if_gre_load="YES" in /boot/loader.conf or build kernel with device gre to 
make it permanent.

-Mike