Multimedia mainly runs on HFC modems, but they have bought several LANs in several cities. Their configuration is different, for example, in a network in Gdynia, purchased from one company, an address is dynamically assigned and there is no need to register MAC. In the past, however, it had to be done. On the other hand, in a network in another district, they have static configuration (you need to manually configure IP data). At least that's how it was until recently, maybe it has already changed as well. The problem is that this configuration cannot be predicted.
On the bottom of the WRT414 router, there is a MAC address on the sticker (it's just hard for me to determine whether it is a WAN, LAN or WiFi MAC). You can set this address as the physical address of your network card and see if it works. If it doesn't work, check the next address (increase the last digit by one), if it doesn't work, then another one. If these don't work, check the back two of the sticker. Remember that MAC addresses are hexadecimal numbers, so after 9 we do not count from zero, we only have numbers from A to F.
If you target the WAN address and it is registered, the internet can start. If it does not start, it is worth calling the MM Service Office and finding out what address is registered on our service, or generally ask how you can connect a device other than the one used so far. The first level of support is often convinced that Multimedia provides services only through HFC modems and will tell you to count the lights on the modem, but if you can convince them that you have a LAN network instead of a modem, the second level support should help quite effectively.
