Double stacked VLANs (was Re: [VLAN] Question on header check)

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Subject: Double stacked VLANs (was Re: [VLAN] Question on header check)
From: ajz at cambridgebroadband.com (Alex Zeffertt)
Date: Tue Jun 20 09:16:03 2006
In-reply-to: <44980E72.3050509@xxxxxxxxxxxxxxx>
References: <20060615194018.GA897@slug> <4491BAB4.6090700@xxxxxxxxxxxxxxx> <20060616100659.GB897@slug> <4492A016.3020808@xxxxxxxxxxxxxxxxxxxxxx> <20060616124359.GC897@slug> <4496646F.7090106@xxxxxxxxxxxxxxxxxxxxxx> <4496D92E.3090404@xxxxxxxxxxxxxxx> <20060619183311.13810.qmail@xxxxxxx> <4497B5CC.1000304@xxxxxxxxxxxxxxxxxxxxxx> <4498045E.8020706@xxxxxxxxxxxxxxx> <20060620150046.12422.qmail@xxxxxxx> <44980E72.3050509@xxxxxxxxxxxxxxx>

> 
> But, it would be equally valid to send a frame with the vlan-7 header
> already in it to eth0.7, so that must continue to work (without
> re-encapsulating it into eth0.7.7)
> 

This is the bit which confuses me.  Why would anyone want to do this?
Why wouldn't they instead just sent the frame to a raw socket on eth0?


Alex

References:
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Frederik Deweerdt
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Alex Zeffertt
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Frederik Deweerdt
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Alex Zeffertt
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Ben Greear
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Peter Stuge
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Alex Zeffertt
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Ben Greear
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Peter Stuge
- Double stacked VLANs (was Re: [VLAN] Question on header check)
  - From: Ben Greear

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