Request for support / IOT connection setup

[christian.kaiser at messagerie.de]

Dear community,

This is my 

Setup:

I am on debian bookworm, uname -r: 6.6.20+rpt-rpi-v8 with NetworkManager
-version:  1.42.4

My wwan device is a ID 1e0e:9001 Qualcomm / Option SimTech SIM7000 with 

udev rule: ACTION=="add", SUBSYSTEM=="net", ATTR{qmi/raw_ip}=="*",
ATTR{qmi/raw_ip}="Y"

The NetworkManager connection 

nmcli connection add type gsm ifname '*' con-name 'test' apn 'iot.1nce.net'
\n

connection.autoconnect yes \n

connection.lldp 0 \n

ipv6.method disabled \n

gsm.mtu 1200

is successful: Connection successfully activated (D-Bus active path:
/org/freedesktop/NetworkManager/ActiveConnection/8)

and ifconfig reports:

wwan0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1200

        inet 10.238.250.1  netmask 255.255.255.252  destination 10.238.250.1

        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen
1000  (UNSPEC)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 1028  bytes 426040 (416.0 KiB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

After setting up the appropriate routing table - not shown here - I can send
and receive udp datagrams.

 

This is my

Problem I am asking for help:

tcpdump -vv  -i wwan0 shows this output (excerpt):

..

22:50:22.477131 IP (tos 0x0, ttl 1, id 54018, offset 0, flags [DF], proto
UDP (17), length 419)

    10.238.250.1.2053 > 239.2.1.1.2053: [udp sum ok] UDP, length 391

22:50:32.481315 IP (tos 0x0, ttl 1, id 54239, offset 0, flags [DF], proto
UDP (17), length 419)

    10.238.250.1.2053 > 239.2.1.1.2053: [udp sum ok] UDP, length 391

.

 

Some "process" is sending every 10 seconds traffic over wwan0.

 

How can identify the "process"  and stop the traffic?

 

Regards

Christian

 

 

 

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