The Linksys router's red light indicates that there is something wrong with your network. But, most probably, your modem isn't currently connected to the internet. If that's the case, inquire about it with your ISP and verify the internet package. In addition, if there is a serious need for the internet, update the plan. Next, confirm that the modem is operating and sending sufficient internet signals to the router. However, if the Linksys router red light continues to appear, make sure the network it is connected to is stable and that the configured parameters are properly adjusted. Finally, try restarting the router and modem.