Can't ping/ssh anymore my mangOH Red

mangOH Red
1

I changed my Linux Distro on my mangOH to add ext4 support, and since then I can’t ping/ssh my mangOH.

Here is some infos:

dmesg 
[ 2424.575806] usb 1-3: New USB device found, idVendor=1199, idProduct=68c0, bcdDevice= 3.18
[ 2424.575812] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2424.575816] usb 1-3: Product: Sierra Wireless WP7702
[ 2424.575819] usb 1-3: Manufacturer: Sierra Wireless, Incorporated
[ 2424.575821] usb 1-3: SerialNumber: VU81038517021013
[ 2424.600407] qcserial 1-3:1.0: Qualcomm USB modem converter detected
[ 2424.600651] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB0
[ 2424.601534] qcserial 1-3:1.2: Qualcomm USB modem converter detected
[ 2424.601722] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB1
[ 2424.603442] qcserial 1-3:1.3: Qualcomm USB modem converter detected
[ 2424.603686] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB2
[ 2424.605523] qmi_wwan 1-3:1.8: cdc-wdm1: USB WDM device
[ 2424.615611] qmi_wwan 1-3:1.8 wwan0: register 'qmi_wwan' at usb-0000:00:14.0-3, WWAN/QMI device, 5e:56:15:d0:fa:d1
[ 2424.623801] cdc_ether 1-3:1.19 usb0: register 'cdc_ether' at usb-0000:00:14.0-3, CDC Ethernet Device, 5e:24:37:40:fd:8c
[ 2424.644341] qmi_wwan 1-3:1.8 wwp0s20f0u3i8: renamed from wwan0
[ 2424.674078] cdc_ether 1-3:1.19 enp0s20f0u3i19: renamed from usb0
ifconfig -a 
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 172.17.255.255
        ether 02:42:a2:8d:01:79  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s20f0u3i19: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 52:d8:54:86:99:3c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp59s0: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 70:b5:e8:a7:b9:c5  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Boucle locale)
        RX packets 5953  bytes 596166 (596.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5953  bytes 596166 (596.1 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp0s20f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.0.39  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::36fd:9c2a:3a3:e9c4  prefixlen 64  scopeid 0x20<link>
        ether f8:ac:65:ff:24:c7  txqueuelen 1000  (Ethernet)
        RX packets 20897  bytes 16551370 (16.5 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 14983  bytes 3118428 (3.1 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wwp0s20f0u3i8: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 36:86:5d:b7:dd:bb  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

My modem interface and my ethernet interface looks well.

I tried then to renew my IP address from my ethernet interface

sudo dhclient -r -v enp0s20f0u3i19 
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s20f0u3i19/ce:4b:de:3e:d5:1a
Sending on   LPF/enp0s20f0u3i19/ce:4b:de:3e:d5:1a
Sending on   Socket/fallback
DHCPRELEASE on enp0s20f0u3i19 to 192.168.2.2 port 67 (xid=0x2ce2709)

Still doesn’t work …

Any ideas to resolve that ?

Thanks a lot !

2

You can manually set the ip address:

sudo ifconfig enp0s20f0u3i19 192.168.2.3

3

Thanks for your answer.

Done that, but still can’t ping and ssh into it (“Connection refused”)

4

you can shut down the firewall by the following command in module’s UART console and see if the problem still exists.
iptables -I INPUT -j ACCEPT

5

Hmm, I can’t type anything with minicom, looks like I can’t connect ?
Here is what i see (nothing change after a reboot).

sudo minicom -D /dev/ttyUSB0 
Bienvenue avec minicom 2.7.1                                                   
                                                                                
OPTIONS: I18n                                                                   
Compilé le Aug 13 2017, 15:25:34.                                               
Port /dev/ttyUSB0, 13:39:04                                                     
                                                                                
Tapez CTRL-A Z pour voir l'aide concernant les touches spéciales
dmesg

[ 7577.911111] usb 1-2: new full-speed USB device number 52 using xhci_hcd
[ 7578.070604] usb 1-2: New USB device found, idVendor=0403, idProduct=6015, bcdDevice=10.00
[ 7578.070610] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 7578.070614] usb 1-2: Product: FT230X Basic UART
[ 7578.070617] usb 1-2: Manufacturer: FTDI
[ 7578.070619] usb 1-2: SerialNumber: DM01A3IT
[ 7578.075735] ftdi_sio 1-2:1.0: FTDI USB Serial Device converter detected
[ 7578.075802] usb 1-2: Detected FT-X
[ 7578.077019] usb 1-2: FTDI USB Serial Device converter now attached to ttyUSB0

6

try baud rate 115200 and disable flow control.
Also if you connect USB cable to PC, it should enumerate /dev/ttyUSB port.
One of it is AT command port, you can check there and see if the UART has been mapped to linux console by AT!MAPUART?

7

Still not working with the flow control disabled.

I can’t find this AT port, where is it ?
Only got this.
maviel@smaviel-g5:~$ ls /dev/ttyUSB*
/dev/ttyUSB0

8

at beginning, you have /dev/ttyUSB0 /dev/ttyUSB1, /dev/ttyUSB2, but now only having one port…
what have you done?

[ 2424.575816] usb 1-3: Product: Sierra Wireless WP7702
[ 2424.575819] usb 1-3: Manufacturer: Sierra Wireless, Incorporated
[ 2424.575821] usb 1-3: SerialNumber: VU81038517021013
[ 2424.600407] qcserial 1-3:1.0: Qualcomm USB modem converter detected
[ 2424.600651] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB0
[ 2424.601534] qcserial 1-3:1.2: Qualcomm USB modem converter detected
[ 2424.601722] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB1
[ 2424.603442] qcserial 1-3:1.3: Qualcomm USB modem converter detected
[ 2424.603686] usb 1-3: Qualcomm USB modem converter now attached to ttyUSB2

9

Yes, sorry about that, only my CON USB was plugged at this moment.
I then succeed to connect to the console but shutting down the firewall solved nothing.

I solved this issue by resetting completely the mangOH.

Thanks for your support.