I'm helping my Daughter move her FIOS router to another room. She has FIOS TV and Internet. She looked at the router (Actionte4ec M1424-WR Rev. D) and There are the usual Cat 6 cables connected to devices. there is the Coax connected to the Coax port that goes into the wall and outside.. AND, there is a Cat. 6 Ethernet cable connected to the Ethernet WAN port that also goes into the wall! Are both needed? I've always thought it was one or the other, not both! Not sure what the Ethernet WAN is doing, since the house is (as is normal) coax.
Steve