FAQ
TL;DR: Router died? On a 120 Mb/s plan, you might need MAC cloning; "This configuration cannot be predicted." This FAQ helps desktop users connect via a wall Ethernet cable without a router, with steps and support scripts. [Elektroda, dt1, post #17363953]
Why it matters: It cuts downtime and prevents misconfigurations while you wait for ISP equipment.
Quick Facts
- Multimedia uses HFC modems and some LANs; configs vary: DHCP, MAC registration, or static IP. [Elektroda, dt1, post #17363953]
- Without the operator’s device, a direct PC hookup often won’t authenticate, so internet stays down. [Elektroda, icosie, post #17363285]
- MAC cloning makes your new router present the old router’s registered physical address on the WAN. [Elektroda, darecki85, post #17372541]
- Entry routers cost approx. PLN 60 (e.g., TP‑Link TL‑WR841N) and work as a stopgap. [Elektroda, darecki85, post #17365891]
- Router stickers list MACs; if unclear, try the printed MAC, then +1 hex, then the next. [Elektroda, dt1, post #17363953]
Can I plug the wall Ethernet straight into my PC and get internet without a router?
Generally no. The operator’s device authenticates your line and enables internet access. Your router often performs that step using credentials or a registered MAC. Without it, a desktop alone will not bring the link up. Use a replacement router or coordinate with support. [Elektroda, icosie, post #17363285]
How do I clone my old router’s MAC on a PC to get online now?
Set your network card’s physical address to match the old router’s WAN MAC, then test.
- Read the MAC from the router’s label; if unsure, note adjacent addresses.
- Set that value as your NIC’s physical address, then reconnect the cable.
- If it fails, increase the last hex digit and retry; test the next label MAC.
This works when the ISP registers MACs on the account. [Elektroda, dt1, post #17363953]
What does MAC cloning do, and when should I use it?
MAC cloning copies an existing device’s hardware address to your new router’s WAN interface. Use it when the ISP tied service to your previous router’s MAC. After a reset, configure only the WAN and enter the old router’s MAC. Do not change LAN settings. Cloning your PC’s MAC instead can block access, because the ISP never saw it. [Elektroda, darecki85, post #17372541]
I’m on Multimedia—do they use DHCP, MAC registration, or static IP?
Multimedia runs mixed networks. Some cities assign dynamic addresses without MAC registration. Other areas required MAC registration before. In another district, static configuration needed manual IP settings. "This configuration cannot be predicted." Ask support which mode applies on your line today. [Elektroda, dt1, post #17363953]
Can a 5‑port EDIMAX Fast Ethernet switch replace my router?
No. A switch forwards frames and does not authenticate to the ISP. It cannot replace a router or modem on the wall link. To get online, connect a configured router or your PC with the correct registered MAC. [Elektroda, makosuu, post #17363373]
How should I set up a new router like ASUS RT‑N11P or TP‑Link TL‑WR841N?
Start clean. Perform a full reset. Configure only the WAN page with your ISP’s parameters. Set the WAN MAC to the old router’s MAC from its sticker. Do not alter LAN settings. Save and reboot the router, then test connectivity. [Elektroda, darecki85, post #17372541]
After I pressed “Clone MAC,” why did the WAN MAC change from the label?
Cloning copied your computer’s MAC into the router’s WAN field. That differs from the router’s factory MAC on the label. Reset the router, enter ISP details on WAN, and input the old router’s MAC instead. Avoid changing LAN settings. [Elektroda, darecki85, post #17372541]
My router’s LAN IP doesn’t match the ISP sheet—do I change it?
No. Leave LAN at defaults and configure only the WAN according to the ISP sheet. Then set the router’s WAN MAC to match the old router. Changing LAN values adds confusion and does not affect ISP authentication. [Elektroda, darecki85, post #17372541]
I cloned the MAC but still have no internet—what should I try next?
Your area may use static IP parameters or different registration. Enter the exact IP settings if provided by the ISP. Edge case: with the correct MAC, a static configuration can still block access. Call support to confirm your registered MAC or mode and request guidance. [Elektroda, dt1, post #17363953]
Support tells me “we only use HFC modems.” How do I get help?
Explain your building uses a LAN service instead of an HFC modem. Ask them to verify service type and registered MAC. First‑level agents might follow HFC scripts. Request escalation; “the second level support should help quite effectively.” [Elektroda, dt1, post #17363953]
My old router is dead—how can I find its WAN MAC?
Check the sticker under the router for MAC addresses. Try the printed MAC first on your NIC or new router. If that fails, increase the last hex digit and test again. If those fail, test the adjacent sticker MACs next. [Elektroda, dt1, post #17363953]
Should I buy a cheap router now or wait for the ISP?
Buy one to reduce downtime. A TP‑Link TL‑WR841N costs about PLN 60. Configure the WAN with your ISP’s details, and provide the correct MAC if they register it. This keeps you online until their replacement arrives. [Elektroda, darecki85, post #17365891]
The router is dead and I can’t clone its WAN MAC—any workaround?
Cloning the router’s WAN MAC is often enough to restore access. That is difficult if the router no longer works. Without that address, options are limited until support updates their records. Ask the ISP to register a new MAC. [Elektroda, makosuu, post #17363877]