ping only goes one way

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http://forums.fedoraforum.org – make a diagram US Robotics broadband router...un\\input from cable modem... broadband router with two "output" ethernet cables going to each of two computers (1) Fedora 17 whose hostname is "Precision-380" ping Landon works This "network connection" was in place before "Landon" was added 2) XP Professional SP3 whose hostname is "Landon" ping Precision-380 does not work ping does work I even tried adding line 1 to /etc/hosts Precision-380 localhost localhost.localdomain localhost4 localhost4.l (HowTos)