It's ok to use the same tracking IPs in multiple mwan3 interfaces?

Installing and Using OpenWrt
#1

Hi, I just read that it's a bad practice to set up the same tracking IPs in multiple mwan3 interfaces, I'd like to confirm if that is a true fact.

My mwan3 interfaces for load balancing look like this:

config interface 'wan'
        option enabled '1'
        list track_ip '8.8.4.4'
        list track_ip '8.8.8.8'
        list track_ip '208.67.222.222'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '1'
        option count '4'
        option timeout '1'
        option check_quality '1'
        option failure_latency '400'
        option recovery_latency '300'
        option failure_loss '20'
        option recovery_loss '10'
        option interval '5'
        option down '3'
        option up '2'
        option family 'ipv4'

config interface 'wanb'
        option enabled '1'
        list track_ip '8.8.8.8'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '1'
        option count '4'
        option check_quality '1'
        option failure_latency '400'
        option recovery_latency '300'
        option failure_loss '20'
        option recovery_loss '10'
        option timeout '1'
        option interval '5'
        option down '3'
        option up '2'
        option family 'ipv4'

config interface 'trm_wwan'
        option enabled '1'
        list track_ip '8.8.8.8'
        list track_ip '208.67.220.220'
        option family 'ipv4'
        option reliability '1'
        option count '4'
        option check_quality '1'
        option failure_latency '400'
        option recovery_latency '300'
        option failure_loss '20'
        option recovery_loss '10'
        option timeout '1'
        option interval '5'
        option down '2'
        option up '2'
        option family 'ipv4'

Notice that I'm using Google and OpenDNS directions for all the interfaces (I also have a script to ping 8.8.8.8 all the time and restart when there's no internet for a certain period). Making pings to the same addresses simultaneously could be indeed a problem?

#2

If your mwan3 works well then that's not a bad idea.

#3

Overall it works ok, sometimes I get some failures at similar times in more than 1 interface, like:

Sun Mar  7 20:16:22 2021 user.info mwan3track[16244]: Check (ping: latency=66ms loss=25%) failed for target "8.8.4.4" on interface wan (eth1)
Sun Mar  7 20:16:29 2021 user.info mwan3track[16244]: Check (ping: latency=427ms loss=0%) failed for target "208.67.222.222" on interface wan (eth1)
Sun Mar  7 20:16:33 2021 user.info mwan3track[16244]: Check (ping: latency=411ms loss=25%) failed for target "208.67.220.220" on interface wan (eth1)
Sun Mar  7 20:16:46 2021 user.info mwan3track[8780]: Check (ping: latency=96ms loss=25%) failed for target "8.8.8.8" on interface trm_wwan (wlan1)

I think it might happen because of network load, considering that it's actually happening for different targets (at least in this example).