[FS#3934] Wireless Wan loosing packets when pppoe-wan is up

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Mauro Mozzarelli (ezplanet) 

Attached to Project - OpenWrt/LEDE Project
Summary - Wireless Wan loosing packets when pppoe-wan is up
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on: Home Hub 5, Linksys EA8300, Linksys WRT32x
 - Software versions of OpenWrt 21.02-rc3
 - Steps to reproduce:

Configure pppoe-wan and wwan to your ISPs

Bring up wwan 
# ping -I wwan0 8.8.8.8
all good.

Now bring up wan (pppoe-wan)
# ifup wan

ping -I wwan0 8.8.8.8 looses packets in initial pings as follows:

# ping -c10 -Iwwan0 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=4 ttl=113 time=201.142 ms
64 bytes from 8.8.8.8: seq=5 ttl=113 time=41.131 ms
64 bytes from 8.8.8.8: seq=6 ttl=113 time=50.998 ms
64 bytes from 8.8.8.8: seq=7 ttl=113 time=40.956 ms
64 bytes from 8.8.8.8: seq=8 ttl=113 time=50.932 ms
64 bytes from 8.8.8.8: seq=9 ttl=113 time=40.753 ms

--- 8.8.8.8 ping statistics ---
10 packets transmitted, 6 packets received, 40% packet loss
round-trip min/avg/max = 40.753/70.985/201.142 ms

As a consequence wwan gets disabled by mwan3 because the test pings always fail.

If I take down wan (ifdown wan), then ping through wwan0 works normally. 

The same configuration was working fine in 19.07 therefore something was changed in 21.02 that causes this issue with the wireless wan network. I am not sure however if this is related to "Wireless Wan", but I do not have a second wan of ethernet type that I can test this issue with.

Excerpt from /etc/config/network relative to the interfaces:

config interface 'wan'
    option device 'wan'
    option proto 'pppoe'
    option username 'vodafonedsl'
    option password 'vodafonedsl'
    option metric '1'
    option ipv6 '0'
    option delegate '0'

config interface 'wwan'
    option proto 'ncm'
    option device '/dev/cdc-wdm0'
    option pdptype 'IP'
    option apn 'web.omnitel.it'
    option service 'preferlte'
    option ipv6 '0'
    option metric '5'

   
The only solution right now is to return to 19.07 that works flawlessly with the same configuration.
Tested with 3 different router (as specified above), all giving the same result.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3934

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