Check Connection

This scenario shows how to configure a cellular interface and then check for network connectivity by pinging Google’s DNS public server. In addition, some operational commands are executed and the information displayed by them is checked.

Test ICMP Connectivity

Description

In DUT0, the cellular module wwan0 is configured with the PIN code required by the inserted SIM card. Additionally, a Packet Data Protocol (PDP) is configured with the APN corresponding to the SIM card’s operator. Then, the cellular interface cell0 is associated with this PDP and configured to obtain its IP addressing through DHCP. Once it’s configured, the ‘Ping’ command is used to check connectivity with Google’s DNS public server.

Scenario

Step 1: Set the following configuration in DUT0 :

set cellular profile CELPROFILE apn movistar.es
set controllers cellular wwan0 sim select socket_1
set controllers cellular wwan0 sim socket socket_1 encrypted-pin U2FsdGVkX19hMnMn028Qjskds/D2DLqJIeQuQHeG3FE=
set controllers cellular wwan0 sim socket socket_1 pdp 1 profile CELPROFILE
set interfaces cellular cell0 address dhcp
set interfaces cellular cell0 phy wwan0 pdp 1
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Note

Once the cellular module is configured, checking whether the SIM and registration states are correct can be done with the following operational command.

Step 2: Run command controllers cellular wwan0 show network-status at DUT0 and check if output matches the following regular expressions:

SIM status\s* = OK
Registration state\s* = registered

Note

On the other hand, checking whether the cellular interface has correctly established the network connection can be done with the following command.

Step 3: Run command controllers cellular wwan0 pdp 1 show network-data-connection at DUT0 and check if output matches the following regular expressions:

Connection status\s* = connected

Note

Additionally, with the previous operational command, the IP address provided by the operator to be used by the cellular interface is displayed. With the following command, it is possible to check if the DHCP client has correctly configured the cellular interface.

Step 4: Run command interfaces cellular cell0 show at DUT0 and check if output matches the following regular expressions:

cell0\s+\d+.\d+.\d+.\d+\/\d+\s+up\s+up

Note

Once all of the above has been verified, we can be sure that the cellular interface has been correctly configured and there is network connectivity. The latter can be verified, for example, by pinging Google's DNS public server.

Step 5: Ping IP address 8.8.8.8 from DUT0:

admin@DUT0$ ping 8.8.8.8 count 1 size 56 timeout 1

Note

More details of the cellular interface can be obtained through the following operational commands.

Step 6: Run command controllers cellular wwan0 show cell-info at DUT0 and check if output matches the following regular expressions:

GSM\/EDGE info|UMTS info|LTE intrafrequency info|LTE interfrequency info|LTE info - Neighboring GSM|LTE info - Neighboring WCDMA|UMTS Cell ID|UMTS info - Neighboring LTE

Step 7: Run command controllers cellular wwan0 show device-info at DUT0 and check if output matches the following regular expressions:

Module Manufacturer\s* = .*\nModule Model\s* = .*

Step 8: Run command controllers cellular wwan0 show temperature at DUT0 and check if output matches the following regular expressions:

Temperature\s* = \d+

Step 9: Run command controllers cellular wwan0 show preferred-bands at DUT0 and check if output matches the following regular expressions:

Bands preference\s* = .*\nLTE bands preference\s* = .*

Step 10: Run command controllers cellular wwan0 show signal-quality at DUT0 and check if output matches the following regular expressions:

(CDMA|EVDO|GSM\/GPRS|WCDMA|LTE):\n\s+RSSI \(dBm\)\s* = -?\d+

Step 11: Run command controllers cellular wwan0 show supported-bands at DUT0 and check if output matches the following regular expressions:

Bands\s* = .*\nLTE bands\s* = .*

Note

Finally, some information can be obtained from the cellular interface via SNMP requests. The following information is provided: the quality of the reception signal, the cell location area code (LAC), the radio access technology used, the tracking area code (TAC), the cell identifier used, and the active radio band.

Step 12: Modify the following configuration lines in DUT0 :

set service snmp community 'COMMUNITY2TEST!'

Step 13: Run command service snmp walk local-agent v2c COMMUNITY2TEST! oid TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatus at DUT0 and check if output matches the following regular expressions:

TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusSignalQuality\."wwan0" = INTEGER: -?\d+
TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusCellLocationAreaCode\."wwan0" = INTEGER: \d+
TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusRadioTechnology\."wwan0" = STRING: .+
TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusTrackingAreaCode\."wwan0" = STRING: \d+
TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusCellId\."wwan0" = INTEGER: \d+
TELDAT-OSDX-MONDB-SYSTEM-MIB::telOSDxMonDBSystemCellularStatusRadioBand\."wwan0" = STRING: .+