NAT Traversal: Peace Agreement Between NAT and IPSec

by Haluk Aydin Sept. 1, 2017 via SANS Institute

The first time I have dealt with a case where I had to pass IPSec traffic through a NAT device -a firewall-, and learned the difficulties, I thought that this is such a weird setup that I would never met another one. I was wrong. After meeting two more customers, all with reasonable reasons for such a setup, I decided this topic deserves more attention