Auto setup routing for wifi and modem-ppp

Embedded Linux Discussions
1

Hi Robert,
I have cellular modem setup as PPP connection, and wifi connection and I found routing table is not setup corrected if PPP is no then connects wifi, or vice versa.
Is there a way on some routing table configuration that wifi takes precedence over ppp, and automatically sets up the rouging table (with metric)?

Thank you,
David

2

Hi @dzhou,

Sorry i haven’t really looked at this issue that much before… Connman supports this, and I’ve previously used it for WiFi to Ethernet fallover…

Regards,

3

Hi Robert,

I dig into the issue a bit more, and if add the following line into ip-up script for the ppp connection, it will set the metric to 10 in this case:
route add default metric 10 gw $PPP_REMOTE $PPP_IFNAME in the ip-up
image

But I found the routing is more than that. It depends which one starts first (wifi or ppp). So, it requires script to modify the routing table, anyway.

Best Regards,

David

4

Hi Robert,

Today is my last day for the year here. I would like to take this opportunity to thank you for your help and support, not just Beagle Bone, but also many other topics beyond. I wish you have a Merry Christmas and Happy Holidays!

David

5

Merry Christmas. I also always find help and support.

6

To be honest, it was a bit difficult for me. I also tried to set up my router, but I didn’t really know how to do it. I searched a bit on the internet for how to do this and found the site http://192.168.8.1, where step-by-step instructions for configuring the router were provided. In fact, there are a lot of things there, such as how to find your IP address, how to log in to the router, how to change the password and name of your Wi-Fi network, and much more. I just recently stumbled upon this site, and I really hope it’s not too late, and it will help you solve your problem.

7

HI Leonard,

For now, I setup network one at a time, i.e. if wifi turns on, the cellular is turned off, vice versa. It works. I like to make it if wifi is on, it takes precedence over wifi. The issues are two folders: one is how to set metric, the other is routing table conflicting for accessing www. Manually, I can change routing table to make it work. But how to dynamically, especially without knowing what wifi and cellular networks will be connected, it is a little hard hing to do. I won’t spend too much time at the moment, and one at a time approach works anyway.

Thank you,
David