I have a USB 3G modem and it has a PPP interface of course. It works great.
The problem is that if I unplug it and use a different modem with a different PPP interface then the Mikrotik sometimes gets confused on which modem goes with with ppp interface.
You can name the usb devices in “ports” and then tell the ppp interface which usb device to use. However, reboot and then terrible things happen. Sometimes, it remembers both modems (and makes the unplugged one red). Sometimes, it deletes one. Sometimes, it deletes both and then changes both ppp interfaces to use the same modem when one is plugged in again.
So, basically, it is very unreliable to switch modems. You have about a 50/50 chance of it working. Then, you have to go in and tell the ppp which modem to use again.
Does anyone have any ideas on how to make the Mikrotik “remember” the modems?
I know it is possible because: sometimes when you restart the mikrotik, even with no modems plugged in, it still has them both listed in the ports (red because they are missing). Plug either in, and it works fine. That is the PERFECT method.
The “REAL” problem is when they DISAPPEAR from the ports. Then when it redetects them, it doesn’t know which interface uses it.
So, if there is a way for it NOT to delete them automatically from ports, it would be fine.