Linux router guru sought for hairpulling issue

Colleagues, I know we’re all usually running big gear, but I’ve been tasked with building some appliances to run in the cloud as VM’s. Looking for someone who has built on Centos 7 using IPSec and GRE tunnels. Having an issue with GRE tunnels and trace route. That’s pulling my hair out. If you’d like to discuss, reply off list. Thanks EKG