Hi 16again,
The tunnel status is UP now. I removed all the VPN configuration done on the GUI and instead rebuilding via the LCI using something "similar" to this: https://help.ubnt.com/hc/en-us/articles/205203170-NR-EdgeMAX-Configure-EdgeRouter-to-Cisco-IPSEC-VPN
However, I believe the 3rd party vendor had to tweak something on their end, because at the end of my day it was still down. It did not go up until this morning when they confirmed it and I verified.
However, when we ping each other, it does not seem to repond back. We suspect the remaining issue is firewall related. What modifications do I need on my EdgeRouter's FW so that it allows traffic from their remote subnet 72.13.6.218 (public IP) to my 192.168.1.250 (private IP), being that 192.168.1.250 is not a WAN address???
I have two Rulesets in my Firewall Policies:
1. WAN_IN with interfaces eth0/in, eth1/in, where the first rule allows established and related states to all protocols. The second rule drops all invalid states.
2. WAN_LOCAL with interfaces eth0/local, eth1/local, where the first rule allows established and related states to all protocols. The second rule drops all invalid states. The third rule allows 72.13.6.218.32 in all protocols.