[ale] DSL switch from Directv

[Jordi S. Bunster]

I recently signed up for Earthlink home ADSL stuff. Nice service. They ship 
you a DSL "modem" that grabs the ip and NATs the connection, so the machine 
connected to it gets a non routeable (private) ip. Yep. You don't even need 
PPPoE, because the device does that part. All you do is raise your ethernet 
interface with DHCP.

And I have it plugged into a machine I set up for sharing the connection 
here. So I was doing NAT of NAT, until I discovered a web site that teaches 
how to set their DSL "modem" to bridge mode, and then get the real IP. For 
that mode, though, you need a PPPoE process running. In moments of intense 
traffic, CPU usage of pppd goes to 15% on my P-133 underclocked to 100Mhz.

Connection drops every now and then (every 400 and so minutes), but nobody in 
the network notices, because it instantly "dials up" again, and the ipmasq 
rules are recalculated. So we see a speed decrease, and after 5 seconds, up 
again. Once in a while. Not a big deal.

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