We have a Cisco 2900 router that we use for VPN, and it's connected to a Comcast business modem. The LAN ip is 10.1.10.2
I also have a Junipe SRX550 firewall that I want to use for VPN, and it's also connected to the same Comcast business modem. The LAN ip is 10.1.10.3
The VPN works on the Cisco 2900 router, but not on the Juniper SRX550. I've had Juniper look at my config, and everything is correct. I was looking at the modem, and I noticed that I have the 10.1.10.2 (Cisco) LAN ip on it for port forwarding, I'm guessing I need to add 10.1.10.2 (Juniper) LAN ip also?
What does port forwarding do? I did not setup the Cisco router.