we want to setup IPSec in linode to connect to a data supplier company. They require as to provide the domain ip and encryption domain. How do we get this encryption domain, is it the broadcast domain?
This link may clear up the meaning of "Encryption Domain": https://serverfault.com/questions/381057/vpn-encryption-domain
"Encryption domain refers to the range of IP addresses of the hosts which will be participating in the encrypted VPN."
This link may also help! It is a guide for setting up IPSec on a Ubuntu VM hosted on Linode: https://zhangyangjing.github.io/blog/2013/01/23/
Best Wishes