Site to Site VPN on a Zywall 110 behind another Zywall 110 (Multiple public IP addresses)
Have an issue to build a Site to Site VPN to a Zywall 110 behind another Zywall 110.
ISP Router -> Zywall 110 (Core, 5 Public IP's, e.g. I use 22.214.171.124) -> Zywall 110 (Internal, WAN IP 172.19.22.1)
- NAT on Core Firewall -> 1:1 NAT, 126.96.36.199 -> 172.19.22.1
- Site to Site VPN with IKEv1 is built on Internal Firewall
Internal Firewall was connected directly to the ISP router before and VPN was working properly.
Now I had to install a 2nd Firewall in front of the Internal Firewall. Since then the VPN isn't working. Get still erro "No Proposal Chosen". Tried to set "NAT Traversal" flag but it's the same.
How can I configure the VPN to get a connection? I assume I need to send the answer to the peer with my external IP 188.8.131.52 but I don't need how to configure properly.
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