LAN speed issue with Router

[L&LD]

Try disabling the Spanning tree option.

I would also do a hard reboot of the whole system too (power all devices down, remove AC power for at least a few minutes and then power up the modem (wait 5 minutes), the router (wait 5 minutes), the switch and the clients.

 

[Nuelan]

I guess that you have fixed IP addresses on most nodes, is there any chance of an IP address conflict?

My network is set up carefully, there is no address conflict up to my knowledge.

Try disabling the Spanning tree option.

I would also do a hard reboot of the whole system too (power all devices down, remove AC power for at least a few minutes and then power up the modem (wait 5 minutes), the router (wait 5 minutes), the switch and the clients.

I'm going to try that. I let you know.

 

[Etz]

Yes it is.

Try to disable it, it may not play nice with particular switch model and may think that you have a loop in your network, when you actually dont...

 

[ColinTaylor]

When the router is unplugged from the switch I can transfer at gigabyte speed from the NAS to a LAN device (~100MB/s). When the router is plugged the same transfer speed drops down to 20MB/s.

How are you measuring this speed. Are you copying files to/from Samba shares on your NAS? What about ftp transfers are they effected in the same way?

If you're using Samba on the NAS try disabling it on the router and making sure USB Application > Network Place(Samba) Share / Cloud Disk > Force as Master Browser is set to No.

Are there any messages in the syslog of the router or NAS when you plug the router into the switch.

 

[Nuelan]

Thanks for all the inputs.

It seems that doing a hard reboot of the whole system allowed me to dig further into my issue.

After the hard reboot of the whole system, everything was back to normal behavior i.e. transfer rate was ~100MB/s, with and without the router plugged. But the problem came back again when the PC connection was switched from LAN to WIFI and then to LAN again. In that situation LAN transfer rate drops down when the router is plugged.

The only way to restore correct LAN transfer rate is to unplug and then plug again the router. I think that thanks to your help I'm on my way to be sorted.

 

[L&LD]

Okay, when you switch from LAN to WiFi, do you turn off the wireless radio on the PC before you connect the LAN cable?

 

[Nuelan]

Should I? I thought it was automatic switching.

 

[L&LD]

Should I? I thought it was automatic switching.

Believe in automatic anything?

Automatically gives the worst possible outcome, ime.

 

[Etz]

Believe in automatic anything?

Automatically gives the worst possible outcome, ime.

Only device where I have seen automatic switching between Ethernet and Wireless actually working are my two Surface Pro 3 tablets, during docking and undocking.

On all other devices, it seems to produce mixed results or just fail miserably...

 

[Nuelan]

Believe in automatic anything?

Automatically gives the worst possible outcome, ime.

Hehe OK, I shall remember