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I have a raspberry Pi with three interfaces eth0 (Ethernet), wlan0 (WiFi), and wwan0 (via a GSM modem)

  1. How can I test if an Internet connection is available via a certain interface? e.g. is my GSM(wwan0) modem connected to the Internet?

  2. If I attempt to run ping www.google.com - How do I know what interface is being used?

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    Hi there. It looks as if your question would be better suited on a different Stack Exchange site as it is more related to general Linux operation, rather than Raspberry Pi specifics. If you like I can migrate this question to a relevant place? – Jivings Oct 1 '14 at 16:13
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    Good question though - Unix & Linux may be ideal for it. – Wilf Oct 1 '14 at 16:22
  • @Morgan - unix.stackexchange.com/questions/158901/… – OneGuyInDc Oct 3 '14 at 13:07