EM7421 Can't perform ping

Hi ,
I am using EM7421 modem on my private lte network (no internet is required)
I have managed to get a correct IP address
but I can’t perform ping between UE (with 7421 modem ) an other UEs
i can perform ping between others UEs.

is there a possibility that the modem block ICMP ?

Best Regards,
Lena

How about tcp/udp communication?

I Don’t know how to test tcp/udp communication
could you advise me ?

you can setup TCP/UDP server on one of the host platform, and then use another host platform to connect as TCP/UDP client.

Hi

I have tried to send UDP/TCP using iperf
I can see it doesn’t work

then it seems the data connection did not establish correctly

i can see the sim is register on the network
how can i make sure that the data connection is not established correctly ?

normally i will ping the google server 8.8.8.8, or do some FTP/HTTP operation.
But now you are using private network, not sure what you can do inside it

the basic operation
send ping, send udp/tcp
is there any modem settings that are related to the data connection?
the modem EM7421 is assembled inside a GETAC Tablet with windows 10
the other UEs that are connected to my cell are able to send ping and UDP/TCP packets between them and to the server.

have you tried some other SIM card with public network and see if the tablet can browse internet?

Have you shut down firewall of Windows?

I Just have tried to connect to public network, i have entered the correct APN and still it could not connect to internet and no ping to 8.8.8.8. it did registered and receive ip.

yes the firewall is off

no idea, seems nothing is working on your side
Is the SIM card working fine on other device?

yes
i insert the sim in other UEs (mobile phone) and they are working: ping and TCP/UDP

what are the return of the followings?

ati3
at!entercnd="A710"
at!impref?
at!gstatus?
at!uims?
AT+cpin?
at+cfun?
at!usbcomp=?
AT!USBCOMP?

ati3
Manufacturer: Sierra Wireless, Incorporated
Model: EM7421
Revision: SWI9X50C_01.14.13.00 883709 jenkins 2022/01/05 07:08:35
IMEI: 356281110277452
IMEI SV: 14
FSN: 8G1516228701B1
+GCAP: +CGSM

OK
at!impref?
!IMPREF:
preferred fw version: 01.14.13.00
preferred carrier name: GENERIC
preferred config name: GENERIC_002.048_000
preferred subpri index: 000
current fw version: 01.14.13.00
current carrier name: GENERIC
current config name: GENERIC_002.048_000
current subpri index: 000

OK
at!gstatus?
!GSTATUS:
Current Time: 155 Temperature: 37
Reset Counter: 2 Mode: ONLINE
System mode: LTE PS state: Attached
LTE band: B28 LTE bw: 10 MHz
LTE Rx chan: 9530 LTE Tx chan: 27530
LTE SCC1 state:NOT ASSIGNED
LTE SCC2 state:NOT ASSIGNED
LTE SCC3 state:NOT ASSIGNED
LTE SCC4 state:NOT ASSIGNED
EMM state: Registered Normal Service
RRC state: RRC Connected
IMS reg state: No Srv

PCC RxM RSSI: -37 PCC RxM RSRP: -55
PCC RxD RSSI: -34 PCC RxD RSRP: -51
Tx Power: – TAC: 0001 (1)
RSRQ (dB): -5.9 Cell ID: 01a2d001 (27447297)
SINR (dB): 23.6

OK
at!uims?
!UIMS: 0

OK
at+cpin?
+CPIN: READY

OK
at+cfun?
+CFUN: 1

OK
at!usbcomp?
Config Index: 1
Config Type: 3 (Generic)
Interface bitmask: 0000010D (diag,nmea,modem,rmnet0)

OK

at!usbcomp=?
!USBCOMP:
AT!USBCOMP=,,
- configuration index to which the composition applies, sh ould be 1

- 1:MBIM USBIF, 2:PCIE USBIF, 3:Legacy-Generic, 4:RNDIS

- DIAG - 0x00000001,
NMEA - 0x00000004,
MODEM - 0x00000008,
RMNET0 - 0x00000100,
MBIM - 0x00001000,
e.g.
10D - diag, nmea, modem, rmnet interfaces enabled
1009 - diag, modem, mbim interfaces enabled

The default configuration is:
at!usbcomp=1,3,10F

OK

try changing it to MBIM

AT!USBCOMP=1,3,100d
AT!RESET

OMG thanks … i have ping it fix the problem
thank you!!!