A steady red light on Linksys router is associated with a bad connection to your internet. Another of the reasons behind it are faulty cables either connected in such a loose or crumpled way. Do inspect the cabling to connect Linksys routers directly to a modem, a source of power as well as a power outlet by making sure these connections are right, kinks, or cracked so as not to break it further on. Try reconnecting the cables at different ends so that the connectivity is perfect. In case the problem still persists, try using a different Ethernet cable to check if it is a matter of the cables.