ng_patch and 802.11Q

[Bear]

Hi,
It seems a good idea... Do you have some example working on ng_ether? 
The manpage of ng_ether seems no example...

On 11/8/2013 6:22 PM, Gleb Smirnoff wrote:
> On Fri, Nov 08, 2013 at 02:11:49AM -0330, Bear wrote:
> B> Hi all,
> B> I want to modify VLAN priority by ng_patch. After reading the manpage of
> B> ng_patch(http://www.freebsd.org/cgi/man.cgi?query=ng_patch) and the
> B> example it given:
> B>
> B>  >  /usr/sbin/ngctl -f- <<-SEQ
> B>  > 	 mkpeer ipfw: patch 200 in
> B>  > 	 name ipfw:200 ttl_add
> B>  > 	 msg ttl_add: setconfig { count=1 csum_flags=1 ops=[	 \
> B>  > 		 { mode=2 value=3 length=1 offset=8 } ] }
> B>  >  SEQ
> B>  >  /sbin/ipfw add 150 netgraph 200 ip from any to simplex.remote.net
> B>
> B> It seems ng_patch can only modify IP header. However, the position of
> B> VLAN header is before IP header and after Ethernet header. How can I
> B> modify it?
>
> ipfw allows you to intercept packets at IP layer. Tp modify VLAN header,
> you need to capture them earlier. May be ng_ether(4) will help you.
>