Request for support / IOT connection setup

[Greg Oliver]

On Mon, Apr 1, 2024 at 11:21 AM Greg Oliver <oliver.greg at gmail.com> wrote:

> On Mon, Apr 1, 2024 at 4:31 AM <christian.kaiser at messagerie.de> wrote:
>
>> 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?
>>
>
> netstat --help
>         -p, --programs           display PID/Program name for sockets
>
> So - `netstat -p | grep 2053 | grep 239.2.1.1` will give you the pid of
> the program sending traffic to 239.2.1.1 on port 2053
>
>
Sorry - `netstat -peanut` will get them all -



>
>
>>
>>
>> Regards
>>
>> Christian
>>
>>
>>
>>
>>
>>
>>
>
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