double NAT with 2 different firewall

Hi all,

First of all, I need some experts in here to shed some lights to my double nat issue.

Last month, I had a firewall migration which require me to setup the network using 2 firewall and use double nat.

I attach here the diagram for better understanding.

So, basically, the load balancer have 2 ISP. One ISP as a main backbone (public IP: 218.a.a.a/27) and second ISP is a backup (public IP: 202.a.a.a/28)

My problems are:

i) user now can't access (ping) any servers (with public IP (218.x.x.x) ) located on WAN, circled in pink :(
ii) user can ping only Gateway (as this IP is configured as gateway in firewall #1) and 218.b.b.b
iii) user can't access any server by using the secondary IP (202.x.x.x) too.

What could went wrong in this setup? Please share any ideas/thoughts....i really appreciate your reply.

Thanks,
Networkkid

Attached Files

Image may be NSFW. Clik here to view.

DOUBLE NATing issue.pdf (160.1 KB)