Devices in sub-network in ORANGE cannot see other devices in orange

[tphz (iptom)]

8. Could you show the result of the command ip route on IPFire

Edit

It might be a routing problem.
Yukon and other hosts on the Orange network need an additional gateway to connect to hosts on the “atlantis” network.
Please, see the similar topic below

How to get port forwarding working

I think so… On W (192.168.0.212) default gateway is 192.168.0.1 but for network 192.168.1.0 gateway should be 192.168.0.86 Could you please try add routing on W (192.168.0.212) for example ip route add 192.168.1.0/24 via 192.168.0.86 dev eth0 and check access from 192.168.1.15 to W (192.168.0.212) again. If I am wrong , someone please correct me.