Question

I have a RUT240, connected via LTE to the internet. There are several devices connected on the RUT240 (Raspberry pi, etc). The RUT240 has NO public IP.

I want to connect from home (Router with DynDNS static IP) with ssh to devices connected on the remote located RUT240.

Is this possible without RMS?? Which possibilities I have?

Andreas

Answer 1

Hello,

As your home router has a public IP you can build a VPN between the RUT240 and this router or some other device behind it. Wireguard would be a good  choice, IPSEC or zerotier will do also.

Regards,

Comments

Thank you for your fast reply.

As I only have a limited data volume (3GB/month), I affraid, that a complete VPN connection needs to much data volume.

Currently I have installed a reverse SSH connection only between 2 Raspberry (one per each network) with very limited data volume demand. The problem is, if the remote raspberry freeze, the connection to the remote network is lost.

Therefore I prefer a reverse ssh connection between the remot RUT240 and the local Router or local raspberry as ssh client.

Is there any possiblity to install a ssh server on the RUT240? It must initiate the ssh connection to the local router/local raspberry.

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Yes you can install a ssh server on the rut but how will you reach it if it has no public address ? Having a permanent link will use data anyway and after a month that could be significant.

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Doing the math for a wireguard tunnel gives:

- keepalives: 60 bytes every 25 s uses ~ 6.3 MB / month
- hanshakes: 120 + 176 bytes every 125 s uses ~6.2 MB / month

That's ~12.5 MB per month for housekeeping, completely negligible compared to you 3GB/month allowance.