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Getting stats from PPPoE modem using raspberry pi

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Weaver:
I suspect that if I could get my raspberry pi initialised then I could collect stats from one of my three dlink DSL-320B-Z1 modems, but I would need to break in to the Ethernet cable between modem and router by putting the connection through a small switch. Thing is, I would also need to have a second network connection into the raspberry pi in order to get the info collected out to the rest of the world. Is there a way to get two network interfaces into a raspberry pi? Also, I have made zero progress getting the pi set up, because I've been far too ill in any case.  :-[

(Reasoning: I can't put everything in the same single existing LAN, I'm not willing to allow visitors access to the modems - security paranoia, plus the fact that there are three modems and I read that you have to mutually isolate the three PPPoE systems if you know what's good for you, because of the use of broadcast and weaknesses in the protocol designs.)

roseway:
Perhaps something like this will solve the problem: https://www.amazon.co.uk/Ethernet-Network-Adapter-Converter-Connection/dp/B003Q85EEA

skyeci:
Do you think the usb adapter mentioned above would work on pi3 ? I need 2 physical lan connections in my pi3

Thanks

Weaver:
@roseway Thankyou. What an utterly incredible piece of kit, a tribute to modern micro-miniaturisation in electronics. And the price!

Does anyone know about the possibilities for drivers and a software stack for such a phenomenal piece of hardware, need to make an o/s aware of it and believe in the idea of pumping Ethernet and IP down such a thing. I have heard of networking over USB before. Incredible. A lot of work done to earn less than an pound per unit.

Weaver:
I've just had another thought, isn't there a wireless NIC on the latest top of the range raspberry pi?

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