Every so often my BT HH3 decides it has tired of being a hub and decides to become a brick. Wifi still works, but the wired network just ceases to respond.
Network investigation shows a high number of network collisions on an 8 port hub. This is operating at 100mbs.
Using WireShark shows that arp requests to 192.168.1.254 go unanswered, so no PC can fnd the router.
I have rebooted the router by power cycling it (I can't connect to do a reset from the admin pages). This changed nothing.
HH3 has been fine for 6 months, but started playing up last month. No new kit has been installed. All extraneous kit has been removed, but problem persists.
Replace the 8 port hub with an Ethernet switch instead, that should eliminate the collisions which hubs are prone to, as they direct traffic to all ports, and are only half-duplex anyway.
Ethernet switches are very cheap and plentiful.
An Ethernet switch will only route Ethernet frames to the correct destination, and not to every device on the network.
Thanks - yes, that makes sense. About time I replaced the hub anyway. Its served me well, but I think its older than 10 years now!
Anyway, I moved the hub to a different port on the HH3 and PRESTO! Everything works.
1 down, 3 to go.
Its always a good idea to keep a hub for testing purposes, should you want to monitor an Ethernet circuit using Wireshark, as a switch will not replicate all traffic on a port, unless you buy one with port mirroring facilities.
I use one on my network in-line with the main Internet connection, so I can monitor traffic in both directions. The half-duplex function does not really degrade the connection, as my Internet link only runs at about 9Mb.
The rest of my network uses proper Ethernet switches.