Losing internet connectivity intermittently on network

Smousie

Smousie

Smousie

Associate
Joined
21 Nov 2011
Posts
15
Hi,

I hope someone can help with my problem where I am losing internet connectivity on the network for a few seconds (between 15-60 seconds) at irregular intervals. It happens about once a hour, sometimes less, sometimes more and always "fixes" itself.

Here is the kicker, the internet never goes down - it only goes down on the network. I have a SKY router with 2 ethernet ports and when my pc is plugged in directly on the router I never lose connection, it is only when I go through the 16port switch that this happens. Problem is all other devices connected to the 16 port switch loses connection intermittently.

This is my network setup - WIFI devices are not shown.

azAayvc.png

How can I diagnose this problem?
Is there some sort of network monitor software I can run that can shed some light on the problem?
Help is much appreciated.
 
Make sure there's only one cable from the router to switch. And only one cable from each switch to the next switch. And no circular loop.

I would probably statically set the IPs for each switch. Say the router is 192.168.1.1, I'd tell it to start the DHCP range at 1.10 then statically set each switch to 1.2,1.3,1.4 etc

Edit, no power line devices are there?

Also get the latest firmware for each switch if they're not dumb switches.
 
Thank you for the replies so far.
I can not detect any loops. I have double checked everything now.
I think it has come down to the ugly part of diagnosis where I have to keep unplugging devices until it is stable.
The upstairs part of the network has now been disconnected and fingers crossed I can find the source of the problem.
 
How many cables from router to switch?

Asking because you list 2x ports.

Also, this Tenda WiFi.. does it expect all APs to be connected or is it meant to be a mesh system? Typically a mesh would be one device hardwired as a master then the slaves connected via WiFi. THIS MAY NOT BE THE CASE. I've never used a Tenda system.
 
Yes only 1 cable from router to switch.
The Tenda Nova MW6 is a mesh system than can be hard wired or use wifi to extend the mesh. I chose hard wired because the signal to the garage unit is pretty weak.
It might be that the Novas are causing the issue. That is the next thing that I will unplug.
 
I have checked all devices and can't see any other that are trying to act as a DHCP server. The screesnhot is the result with the top floor disconnected. As you can see it is a unreliable problem that happens random times most of the times it is only down for 15 seconds. I have now disconnected the garage and will continue to monitor.

ixOka1l.jpg
 
I'd be trying to exclude the 16 port switch as a first step. If you don't you could be messing around forever with the rest of the network and never find the fault.

Swap the switch out, or temporarily disconnect everything so you just have router->Switch->PC.
 
Thanks. I was sceptical that it could be the switch. It is only about 11 months old but I am beginning to suspect now. Problem is I dont have anything which I can replace it with.

Tried to get in touch with netgear support for a warranty replacement but couldn't get through.
 
The problem was the Sky Q hub. I have been running a openwrt flashed homehub5 for about 5 days now and had no problems whatsoever.

The line connects slower with the openwrt firmware on the homehub5 so I am going to buy a decent router. Asus dsl-ac88u or Netgear D7800 nighthawk looks to me like the best options. I will also request a replacement router from Sky as a backip.
 
I finally got this resolved. After trying a HH5a flashed with openwrt and not having any issues I came to the conclusion that it is a router problem. Got a sky replacement router and all is well. Thank you all for suggestions.
 
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