Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Is it true that the GRE (Cisco tunnel) header is placed in the IP header "option field" ?

Are the IPSec headers (ESP or AH) installed in the "option field" too ?

share|improve this question

You must log in to answer this question.

Browse other questions tagged .