When using GRE tunnel for site A to site B connections, is it always necessary that the differents sites belong to separate network segments.
Here is my scenario.
I have two sites which were originally connected by trunk links.
Both sites have identical VLANs but for some reasons site A and site b can no longer use the trunk links.
There is an internet connection on both sites. I am thinking of using GRE to connect both sites but I use to think GRE works easily when site A and site B belong to different network segments.
May be i am wrong. Any ideas on how i can handle this situation will be appreciated.