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Hello,

We are currently testing the VPN through RMS.

We are using TRB255 in LTE-M and we are observing strange and repeated behaviours.

Tested with FW 00.07.00 et FW 02.06.1

Edit : Same behaviour with TRB245 4G, last FW.

Once the devices / routes are configured, the connections are established well.

However, device ping is random with a failure rate of 1 in 5 on successive requests and a response time that varies from 150 to 300ms when it works.

If we connect to the devices' web servers, the connection regularly fails to load, probably due to the instability of the connection.

We use the OpenVPN Connect V3 client on the PC User side (WAN via ADSL box) and it disconnects very regularly too, without any reason.

Tests carried out with 2 different configurations, 2 different sims with very good reception levels (-55 to -65dbm), 2 different locations but the behaviour is repeated.

Are there any special measures to take to make the connection more reliable?

Edit : Routes are set as described in example : 192.168.1.251 / 255.255.255.255

Edit : Device (M251 PLC) can be reached without any problems in local network

Ping results (over OpenVPN connection)

C:\Users\xxxx>ping 192.168.1.251 -t

Envoi d’une requête 'Ping'  192.168.1.251 avec 32 octets de données :

Délai d’attente de la demande dépassé.

Délai d’attente de la demande dépassé.

Réponse de 192.168.1.251 : octets=32 temps=219 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=183 ms TTL=63

Délai d’attente de la demande dépassé.

Réponse de 192.168.1.251 : octets=32 temps=263 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=216 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=155 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=110 ms TTL=63

Délai d’attente de la demande dépassé.

Réponse de 192.168.1.251 : octets=32 temps=222 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=171 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=117 ms TTL=63

Réponse de 192.168.1.251 : octets=32 temps=55 ms TTL=63

1 Answer

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Hello,

We apologize for not answering your question for so long. Please clarify if it is still relevant to you.

Best regards.