Are there special considerations for VPN when remoting to PLCs?

tmaususer
tmaususer used Ask the Experts™
on
We have remote VPN through a Cisco firewall.  It works fine for most users.  It’s a little slow of course.  However, we have one user who remotes in to troubleshoot issues with PLC’s (this is a manufacturing facility).  He has a hard time staying connected to the PLCs.  Otherwise, his VPN works fine.  Are there special considerations for VPN when remoting to PLCs?
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Fractional CTO
Distinguished Expert 2018
Commented:
If the PLCs are accessible using ssh directly, then use ssh without a VPN.

Strength of ssh ciphers is controllable, so can be adjusted for better strength than VPNs while avoiding VPN performance problems.

So if ssh can be used directly, direct ssh will usually be much faster.

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Commented:
We haven't had opportunity to test this.  I'm not sure how ssh works, but I believe this would be the correct answer.
David FavorFractional CTO
Distinguished Expert 2018

Commented:
Good luck!

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