OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version openwrt-21.02
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Mauro Mozzarelli - 14.07.2021

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

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
all good.

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

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

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

— 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 ''
  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.


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