I turn off the modem for 3 hours, after than I turn it on but there is no internet
Auth's light is flash (turn on and off for)
So what is the problem?
Is this a model/router combo unit? If not then briefly shut down your router as well.
Please note that after turning the unit back on it will take a couple of minutes for it to completely come online and negotiate a new public IP address with your ISP, Wifi parts may take even longer to come up fully.You have to be a little bit crazy to keep you from going insane.
Model no. RG-DLINK-DIR850L
For this router have to light one is green the other one is orangeI tried to switch off and turn it on but still the color same and no connection on our mobile phone
You turn off the modem you said. I assume the modem is from your ISP?
Did you turn off the router also? If not power cycle the router as well.If you connect to the modem directly with LAN cable, do you have any problems?
The DLINK-DIR850L is a wireless router, not a modem. If the router is working, your devices should be able to connect to it but there will be no internet connectivity if the modem isn't working. You will then have to determine if the modem has a problem or your ISP has a problem.
One rather obvious question - did the it ever work; were you able to connect to the internet until very recently?