[SOLVED] Router to modem = "host unreachable"

[briess]

Router cant connect to modem.. After a years (without issue) using thosse hardware, sudenly my router cant connect to modem..(the light on router turns red, the light on modem stop blinking) I can ping to my router..but I cant ping to my modem (via router) the result is "host unreachable"

My network topology :

Modem - wired lan - router - wifi - pc *The range between modem and router are about 40 meters using lan wired..

I've tried several ways to check if its the modem, router, or the lan wired that cousing the trouble using lan tester.. I've made new criemping on both side..

First try : wired lan connect to lan tester and on the other side connect to modem..result lights 1 - 8 except 3 seems to be fine, they'all blinking except lights 3..

Second try : i connect the lan wired to lan tester on both side..all lights are on..(1-8) Than I put it back to to modem and router, magicaly it works..i can reach the modem via router..so i can spread the internet using wifi router

6 days letter, samething happend, router lights turn red and i cant reach my modem and lost the internet.. so I check again

Third try : lan tester to modem...result all 8 lights turn on except lights 3..

Fourth try : lan tester to router..result only line 3 off

Fifth try : lan tester on both side..result only line 1,4,6 on, but after 3 minuites all lights on..

I connect back to modem n router still wont work.. Anyone know what happend? What sould i do to fix it please?

Btw i also have tried connect the modem to tester and the router to tester with new wired lan..the result all lights on and its seem to be fine.. Please help

 

[kanewolf]

Your 40 meter cable has a bad end. Moving it around while working with the tester, etc sometimes makes connection. You could try re-terminating it or you could replace it.