I am trying to configure two PPP networks ( two Modems ) in single PC (Latest Redhat 3.10 kernel OS , I have tested on latest Ubuntu 18.04LTS). However, However everytime "While connecting two devices, Network Manager/Modem Manager is crashing."

[awneil]

Could you edit the title? it’s supposed to just a quick one-line summary!

I think its well-known that the Ubuntu modem manager crashes with the SiWi parts - so you need to disable it.

EDIT

Trying to connect my FX30s to the Ubuntu VM in Windows

I have my development environment set up in a VMWare VM running Ubuntu 16.04.2. I have installed Developer Studio and can build my code. Now I am trying to connect my FX30s to the VM. I can get it connected to my Windows Machine and I can attach it to the Ubuntu VM. The device is enumerated and appears as a ethernet adapter and as a modem. However after a few moments the ethernet adapter disappears and the modem remains. This seems to have something to do with the fact that it is enumerating a…

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etc…