Story: I have Cisco ASA 5515x in the HQ (10.9.1.0/24) connected via site-to-site VPN to office A [10.9.2.0/24 and 10.9.3.0/24].
Challenge: I need to connect Cisco ASA 5515x to AWS VPN to reach AWS private network (10.9.4.0/24) to end up having the following setup:
AWS private network <--> HQ <--> Office A
where HQ and Office A should be able to reach the private network in AWS and vice versa.
Problem: Cisco configuration file provided by AWS does not work with the previous scenario, I tried to change the config file to make it works but the tunnel still down, only Office A tunnel is up.
I'm aware that extra config required on Office A router and HQ router to connect all network together, but I still was not able to bring the tunnel up between ASA and AWS.
What should I do to add site-to-site VPN on existing ASA VPN?