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It is absolutely necessary to specify a default gateway, because without the correct IP address provided here nothing will work. So you will have to specify the IP address of the fli4l router here (the Ethernet interface's one) - for example 192.168.6.4, depending on the IP address that has been specified in the file config/base.txt for the router.
It is wrong to enter fli4l as a proxy in the Windows or browser configuration unless you use a proxy on the router. Normally fli4l is not a proxy, thus please do not specify fli4l as a proxy!