Communication between devices on the LAN

[Peter-123]

Folks, I have a Vodafone Fibre (THG3000) router and all devices using it connect to the Internet and work well. However, these devices struggle to connect to each other, even though they are on the same LAN.

When I logon to the router I can ping all the devices and all the devices can ping the router.

However, when I use a device I can wait maybe up to 15 minutes pinging (from the device) to other devices before I get a successful ping. If I reboot the router the devices can ping each other pretty much straight away.

There is nothing special about my setup. Software on all devices, including router, are up to date and all devices use IPv4. Not sure it is important but - Sharing is enabled, uPnP and Device Fingerprinting are enabled.

Anyone any ideas? Can't help but think it is a software bug on the router, this wasn't a problem with the Sky router.

[Cynric]

@Peter-123 How many devices?

If you can, turn off uPNP because it's a security risk.

Look at the DHCP settings and see what timeout is set. Try different values, perhaps 24 hours in the first attempt. I'm concerned that all the DHCP sessions may be used and this is why the router reset is helping. Are there more devices than addresses in the DHCP range.

Turn off IPv6.

See how you get on with these ideas.