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                     More on that peculiar router of mine …
                                        
> From: Mark Grosberg <XXXXXXXXXXXXXXXXX>
> To: spc@conman.org
> Subject: Router
> Date: Tue, 22 Jan 2013 11:10:49 -0500 (EST)
> 
> To explain your router: You have three actual hardware Ethernet MAC (Media
> Access Control)s:
> 
> * The WAN (Wide Area Network) (probably eth0)
> * Internal (probably eth1)
> * WIFI (probably eth2)
> 
> The br0 interface is a software bridging between eth1 and eth2. This way
> your wireless computer is on the same network as your wired computers. But
> it's not a real physical device but represents packets from either eth1 or
> eth2 to the IP (Internet Protocol) stack. The multiplexing is done in the
> driver for that interface.
> 
> As for the IP address discrepancy: eth0 does not actually act as your
> Internet. That's not how DSL (Digital Subscriber Line) from XXXXXXXX works.
> eth0 uses managed IP's to bring up a PPPoE (Point-to-Point Protocol over
> Ethernet) session. So ppp0 will likely have your public IP address. Those
> packets get tunnled within the other set of IP's. That's a guess since I
> don't have XXXXXXXXX DSL though.
> 
> The thing with software, even embedded software these days is that there
> are so many layers of existing crap (that don't need to be there but
> skittish managers are loathe to remove things they don't grok) it's
> amazingly difficult to grasp the whole picture since there is often little
> rationale behind it.
> 

That actually explains the behavior I'm seeing on the router [1]. So I can
monitor the Intarweb traffic on eth0, overall LAN (Local Area Network)
traffic on eth1 and the WiFi network via eth2.

Okay then.

[1] gopher://gopher.conman.org/0Phlog:2013/01/21.1

Email Sean Conner at sean@conman.org

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