01-15-2025 07:34 AM
The MGMT interface is completely separate from the dataplane so them overlapping wouldn't be an inherent issue for the firewall when it comes to retaining access. That isn't to say having overlapping addresses wouldn't give you routing issues behind the firewall depending on how any connected network is actually configured. Since you don't have access to the firewall through CLI or GUI, you'll need to actually be able to console into it to correct things at this point. While we don't now anything about the network that your firewall is connected to, I would start by just ensuring that you aren't stepping on overlapping addresses so you can rule out routing reaching the firewall.
If you're deadset on needing the GUI to correct this issue and aren't comfortable in the CLI through the console port, you would be able to disconnect the MGMT port and directly plug into it with your laptop. Keep in mind that any permitted-ip limitations will still be in play, so if you have that functionality configured your laptop will need to be set to a permitted address to access the firewall at all through this method.
As to your last question, this would only work if you already have the interface configured and have an interface management profile assigned to it. That wouldn't be a standard configuration to have; the best path forward that we can really offer without major risk to your network is correcting the issue through the console port or directly connecting your laptop to the MGMT interface to regain access to the device.
