Cannot connect to the network through *any* router. Modem works fine.
I've been trying to figure this out for 3 weeks now.
I have a Netgear AC1900 CM700 modem, and a Synology RT1900ac router. I've been running ethernet from the modem to my PC for these weeks without any issues - the modem appears to be fine. When I hook up the router, the ethernet/internet drops completely. The router does not seem to be capable of connecting to the internet.
I can connect to the router inferface, however, so I know it's at least communicating with the PC somewhat.
I contacted Synology and they are not very helpful. Their advice includes: Hard reset, soft reset, and making sure the firmware is up to do. All done. With that out of the way, they replaced the router with an identical model. I have the same issue on the new router as well. In addition to that, I borrowed a router from a friend (different model entirely), and have the same problem.
So now it looks like any router I connect, cannot access the internet. Unsure where to go from here, but any advice is appreciated.
Have also tried different ethernet cords both from the router to the PC, and from the modem to the router.
Posted Jan 2, 2018, 12:00 AM UTC · edited
Turn off the modem for a few minutes. Connect the router to the modem, then turn the modem back on. This should force the ISP's DHCP server to issue the router a lease.
If this doesn't work, then have the router clone the MAC address of a working computer. This will fool the ISP into thinking the router is the computer and enable the router to obtain a lease.
The second step fixed it for me. Thank you so much!
If cloning your MAC fixed it, the problem might happen again. Who is the ISP? DHCP should reset with a power cycle. If not, something is wrong/weird. Glad it's fixed, but curious what caused it.
The ISP is Cox. Power cycling anything/everything definitely hasn't fixed it up until this point, but yeah, cloning the MAC address through the router interface was an instant fix.
I'd love a long-term solution too because I do run a media server and I hate to have downtime if I'm away from the house.
Yea, something is off. My best guess is your IP was under DDOS and by using a cloned MAC address, it forced the modem to assign a new IP that wasn't effected. Was it happening with Torguard disabled? Can/do you see any unusual inbound traffic requests? Might want to scan your network for malware too, see if any rogue programs are "phoning home".
If you want to test what's going on, try uncloning the MAC address on the WAN and reboot everything and look what IP the WAN interface gets. 172 IP? 169? Does DHCP just fail? If so, what kind of error? Check the logs and Traffic Control" ---> Monitor for data.