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I dial up into one of our data loggers, and ftp some files from it. I was wondering if there is a way to maintain the internet connection (connected through Ethernet / LAN)

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Are there any specific problems you are having? I never had problems with dial-up and Ethernet running at the same time. – AndrejaKo Sep 29 '10 at 12:13
@AndrejaKo - I get disconnected from the internet – dassouki Sep 29 '10 at 12:24

I don't have a second connection to test this on, but try anyway. Post a comment if any step fails, or if I'm doing it entirely wrong.

Configure the network to only route some packets through the dial-up connection:

  1. Find out the dial-up connection's default gateway. It's in the Status window of the connection, in ipconfig, and (if you know what to look for) in route print.

    1½. Find out the data logger's IP address using nslookup dataloggers-hostname

  2. Disable addition of the default gateway for your dial-up connection.

    • Connection properties → Networking → TCP/IP → Properties → Advanced...
    • Disable Use default gateway on remote network
  3. When you connect, add a route to just the data logger.

    route add

    where would be the data logger's address and the gateway's address (which you wrote down in step 1).

  4. Test.

  5. If it works, and you want it to persist reboots, then add the same route again, with route -p ... this time.

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