The Boston Diaries

The ongoing saga of a programmer who doesn't live in Boston, nor does he even like Boston, but yet named his weblog/journal “The Boston Diaries.”

Go figure.

Tuesday, January 22, 2013

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 MACs:

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 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 from XXXXXXXX works. eth0 uses managed IP's to bring up a PPPoE 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. So I can monitor the Intarweb traffic on eth0, overall LAN traffic on eth1 and the WiFi network via eth2.

Okay then.

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