unless you don't have other computers connected to yours and want them to read your files or use your printerCondivisione file e stampanti per reti Microsoft
the last one is just for showing a yellow triangle with exclamation mark when the lan connection isn't working proper (like in case of stripped cable or netplug of router)
there's nothing you can set which would help with your problems
router settings you normally get access to by browser - the adress differs by brand, model and provider