Is Diffie-Hellman used in all secure tunnels?

[UncleJP]

Is Diffie-Hellman used in all secure tunnels, such as those use in EAP and IPSec?

Any input is appreciated.

[Sheraz.Salim · Accepted solution]

The Diffie–Hellman key exchange method allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure channel. Diffie-Hellman (DH) is mostly used in phase 1.

[UncleJP]

Gotcha. It is not used in every single secure tunneling/authentication method, correct?

Edit: I reread your response. I am all clear now. Thank you!

[Sheraz.Salim]

yes this is correct here and here  is link will give you more insight information.