[indymike]

Dpi has been around for a very long time.

[rahimnathwani]

Yes, but I'm specifically talking about a time when many corporate networks weren't yet using DPI.

[mbreese]

Many of them still aren’t. Case in point - the firewall from the original post.

[rahimnathwani]

OP describes tunneling SSH within another protocol. In the absence of DPI, this wouldn't be required.