Raspberry Pi and Huawei e3131 modems, speed problem

Hello!

I'm trying to create little home server based on Raspberry Pi 4 with Huawei e3131 modems.

At first glance everything looks correct, i have two network interfaces ppp0 and ppp1, wvdial, routing works well etc. When i started using these interfaces i found issue with connections speed. In short, speed of two modems used in this same time is lower than single one...

I'm not expert with networks, linux etc. and i can't find any informations about it.

How to find why my modems are "limited" or what i did wrong?

Below is my configuration:

ifconfig

ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500 inet 100.113.170.144 netmask 255.255.255.255 destination 10.64.64.64 ppp txqueuelen 3 (Point-to-Point Protocol) RX packets 10384 bytes 9099105 (8.6 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 10130 bytes 943812 (921.6 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 ppp1: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500 inet 100.81.212.147 netmask 255.255.255.255 destination 10.64.64.65 ppp txqueuelen 3 (Point-to-Point Protocol) RX packets 33572 bytes 32512195 (31.0 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 26854 bytes 2536540 (2.4 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

ip route show

default via 192.168.0.1 dev eth0 onlink 10.64.64.64 dev ppp0 proto kernel scope link src 100.113.170.144 10.64.64.65 dev ppp1 proto kernel scope link src 100.81.212.147 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.25

ip route show table USB0

default via 100.113.170.144 dev ppp0 100.113.170.144 dev ppp0 scope link src 100.113.170.144

ip route show table USB3

default via 100.81.212.147 dev ppp1 100.81.212.147 dev ppp1 scope link src 100.81.212.147

Are these serial modems? Over what medium?

Back in the very early days of windoze, You would use a modem over a telephone line. My first modem did 2400 bps (Yes, bits per second). I got on the internet with a floppy from a PC magazine and a trunk call. It all sounds ridiculous now.

Anyhow, there's a technique known as 'bridging' for when the you want to use 2 slow interfaces to make 1 faster one. Knock yourself out. There should be plenty online. I can't help much.

Two modems don't make it twice as fast unless you have a special setup even if you have two LTE connections that allow tethering.


Two modems I'd guess on a PI will just take more resources. Use top to see resources to start.