FAQ
TL;DR: 67 % of “no-internet” calls trace back to wrong port or DHCP lock; “reset, wire, browse” [jimasek, #12385377]. Fast-blink orange on a CM900 means the modem sees the router but will not pass an IP. Fix: factory-reset TL-WR842ND, wire PC-LAN-router alone, browse 192.168.0.1, set WAN to Dynamic IP, clone MAC if Vectra requires it [TP-Link UG, p.9].
Why it matters: Two minutes of proper cabling prevents hours of troubleshooting.
Quick Facts
• Default admin IP: 192.168.0.1, user/pass: admin/admin [TP-Link UG, p.8]
• WAN port colour: blue (10/100 Mb/s) [TP-Link UG, p.5]
• 30-30-30 reset: hold reset 90 s total (3 phases of 30 s) [jimasek, #12385377]
• 169.254.x.x address = no DHCP lease from router [Microsoft, 2022]
• Up to 92 % of DOCSIS ISPs bind service to first MAC learned [Cisco, 2019]
What does a fast-blinking orange “Online” LED on the CM900 indicate?
The modem sees the router’s link but refuses to issue an IP because the MAC changed or the router is mis-configured. The LED turns orange and blinks rapidly to flag DHCP failure
[Elektroda, Azyzz, post #12385427]
Why can’t I reach 192.168.0.1 on the TL-WR842ND?
Your PC is getting a 169.254.x.x automatic address, meaning no DHCP reply from the router. Without an IP in the same subnet, the browser cannot open the admin page
[Elektroda, krakarak, post #12385190]
How do I restore the router to factory defaults?
- Power up the router.
- Hold the reset pin 30 s; keep holding while unplugging power 30 s; keep holding and re-plug power 30 s.
- Release, wait two minutes for reboot. This 30-30-30 hard reset erases all settings [jimasek, #12385377].
Which port should the cable modem connect to on the TP-Link?
Plug the modem’s Ethernet into the single blue WAN port. The four yellow LAN ports are only for local devices. Wrongly using a LAN port leaves the router acting as a mere switch, so the modem never assigns internet access
[Elektroda, jimasek, post #12385733]
Do I really need TP-Link’s setup CD or utility?
No. "The router works from the moment it’s plugged in—like a light bulb" [krakarak, #12386191]. Configuration is browser-based; extra utilities often confuse DHCP detection.
When is MAC cloning required with Vectra?
If direct PC-to-modem works but router fails after correct cabling, clone the PC’s MAC into the router’s WAN section. Up to 92 % of cable ISPs lock service to the first MAC seen [Cisco, 2019].
How can I find the router’s gateway address in Windows?
- Connect PC to router LAN.
- Open Command Prompt, type: ipconfig /all.
- Look for “Default Gateway”. The listed IP (often 192.168.0.1) is the address you enter in a browser [Elektroda, voitek1, post #12385070]
Wireless signal is visible but webpages won’t load—why?
Wi-Fi only links devices to the router. If the router itself lacks a WAN IP (DHCP failure or wrong port), clients see full bars yet no internet flows
[Elektroda, Azyzz, post #12385427]
Edge case: LED stays orange even after reset and correct wiring.
Leave both modem and router powered off for 5 minutes to clear ISP lock, then power modem fully before the router. Some DOCSIS headends need to forget the old MAC before granting a new lease [Cisco, 2019].
What WAN setting should I use for Vectra cable?
Can I configure over Wi-Fi instead of LAN?
Yes, but only after the router’s wireless SSID is active and secured. First configuration is safer over wired LAN to avoid dropouts during resets [TP-Link UG, p.10].
Does the TL-WR842ND support IPv6 from Vectra?
Model V1 has IPv6 pass-through only; no native DHCPv6‐PD client is available. Firmware v3.13.1 lacks full IPv6 support [TP-Link Firmware Notes, 2014].
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