Previously, I mentioned 5 unknown MAC addresses often connecting to my router, and noticeably causes my internet to be slow.
Router: Tenda D303, Location: India, Connection: BSNL Unlimited 1Mbps broadband.
User drjimbob helped to eliminate other possible causes for slow internet, and here’s my research:
- “Possibly weak passphrase for Wi-Fi, hence neighbours using it.”
I’ve been using WPA2-PSK authentication, with AES encryption. Tried several complex passphrases for a month now. There are no neighbours other than some close family members, and I have discussed with them this issue.
- “Interference from neighbours’ routers.”
It’s more like a countryside, more greenery, and less routers in here. I couldn’t find any visible Wi-Fi access points or a router other than mine in my home and vicinity. Also, not many wireless equipment here that could cause interference.
- “Malware or user-installed software like bittorrent using up bandwidth.”
Couldn’t find any malware on any of my devices, nor any heavy downloading.
- “ISP’s problem.”
Highly unlikely because when I disable Wi-Fi and use internet via Ethernet from the same router, all works fine, on all PCs.
Now let's set aside the slow internet issue. These 5 MAC addresses, all starting with 00:ff, and titled “DELL” in the DHCP table is what troubles me.
- My research shows a clear correlation between slow internet and presence of these 5.
- I “banned” these 5 under router’s MAC filter, yet they pass through.
- These 5 are not my devices. My 2 DELL laptops appear separately with their own MAC addresses starting with 9c:2a and 64:5a respectively. I even checked all my other devices’ MAC addresses.
- What are these 5 MAC addresses?
- How do I get rid of them?
EDIT: The 5 MAC addresses are: 00:ff:93:86:02:04, 00:ff:10:ad:b7:82, 00:ff:14:97:c9:73, 00:ff:eb:72:a3:85, 00:ff:f6:cc:8e:f7