I have ZTE MF669 modem and RTL8188eu wifi card.

My wifi address is fixed (

Modem gets address from subnet.

My wlan connection stops working when I connect to 3G network. I tried with ping

SSH (with putty) disconnects when modem is obtaining network parameters.

Modem connection works normally.

I can't troubleshoot this from console (this is headless system - no monitor, no keyboard).

What is the problem?

  • The problem is likely that the computer will route all traffic out of the 3G connection when it connects. I would attach a screen / keyboard to it before you try and do anything else as it would make things a whole lot easier. – Lawrence Jul 24 '14 at 8:08
  • I have 2 USB ports there. One is WiFi, other is 3G modem... I don't want to buy USB port replicator to solve this :) – Kamil Jul 24 '14 at 10:08

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