@IotaNetworksyou have two issues here. Firstly I'd hazard a guess that the LAN port of the MX you are trying to add is in the 192.168.24.0/24 subnet, if not then you can proceed, although it will affect the ability of that MX to talk to the 192.168.24.0 network. The second issue is that, unless you don't need to talk to the outside world, the 192.168.0.0/12 network covers the IP ranges 192.160.0.1 - 192.175.255.254, most of which are genuine public IPs and not private ones, you will not be able to access any of them so I'd fix that first!
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