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I have a router that the ISP gave me, its an Arris TG862 that has internet connection and I have my old router, Linksys E2500, that I use in bridge mode, then all of the sudden my 2 routers stop communicating, what do I mean by this:
I have my LAN cable from an Ethernet Port of my Arris to the Internet Port of the Linksys but the LED on the back wont turn on. Then I told to myself that maybe the cable is damaged and went ahead and pluged in my laptop to that same Ethernet cable and it worked, then I told myself "well the port on the bridge does not work" and got another LAN cable and tested all 5 ports on the bridge and they all turned on, the only way the port on the back of my router and bridge mode don't turn on its by connecting them together.
From what I think I know, the Linksys will treat its "Internet" connector always with the same pin assignment, so it may be required to use a crossover ethernet cable between the Arris and the Linksys. Of course, you could also try an autodetecting hub between them. – Run CMD – 2015-10-30T09:17:44.950