Dual XGS Site to Site RED tunnel

Hello everyone,

I am quite new to Sophos and just recently bought two Sophos XGS, a XGS 107 for the main site and a XGS 87 for a remote site about 5500km away. I am currently configuring and testing everything before flying there in two weeks for the install. I got the XGS at the main site set up to where everything works fine, however I still haven't implemented restricting Rules and basically allow any to any...

I also have set up a RED tunnel between the two

My Network looks a bit like this:

Main Site:

172.16.100.0/24

Dynamic DNS is used as there is no static IPV4

RED Interface: 172.16.222.1/24

Remote Site

172.16.200.0/24

Currently this unit also gets its uplink through the network here, will later go on one of these wireless broadband connections

RED Interface: 172.16.222.2/24

In terms of Rules to allow RED Traffic, both XGS Units have a LAN to LAN (any) Rule

Static Routing has been configured like this:

On Main Site:

Destination IP: 172.16.200.0/24

Gateway: 172.16.222.2/24

Interface 172.16.222.1/24

AD: 1

Metric: 0

On Remote Site:

Destination IP: 172.16.100.0/24

Gateway: 172.16.222.1/24

Interface 172.16.222.2/24

AD: 1

Metric: 0

The red connection is successfully established. However I have no communication between both units. I can't ping in between them from any one of the XGS Untis, let alone ping a host that is directly connected to the other XGS.

At this point I have no idea what I am doing wrong. I tried pretty much everything I read up online (like disabling Tunnel Compression), to no avail. I also put this post up on Reddit where I got some leads, but nothing that pointed me in the right direction. I am 100% certain this is some extremely rookie mistake, but I just can't figure it out...

Thanks so much for your understanding and replies

Melvin (Germany)

Also if this post in any way is against guidelines I am extremely sorry. Let me know!