You can disable an interface while in SafeMode.
To disable an interface
In the SafeMode Network Interfaces screen, select the Network interface option.
Select the interface you wish to edit and press Enter.
The IPv4 and IPv6 addresses, Netmask, MAC address, Gateway, and DNS settings are displayed on the screen above the interface selection dialog.
For example, select IPv4 Address and press Enter.
The on-screen dialog displays the current IP address.
Navigate into the dialog and change the IP address to 0.0.0.0, then press Enter.
Press Tab to navigate to the Save changes button and then press Enter.
Disabling DHCP may be sufficient to disable the interface.