Slow ethernet transfer speeds


I have a very basic small network with 1 2012 Essentials server and 5 Dell laptop clients 8.1 Pro 64bit.

When the clients are connected via the wifi using the BT router I get good traffic to and from the server and good web traffic.

When they are connected via the Ethernet (intel i218-lm) I get good pings but v v v slow data transfer to the point of not really connecting.

I have made sure all drivers are up to date but still no luck.

I have double checked the cables and all seems fine.

timb551IT ManagerAsked:
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If you can try some other network card (USB to LAN) on those hosts or try how network is working on some other host (not those Dell laptops). That should eliminate one side of problem - laptops or network infrastructure.
Naranthiran DSystem AdministratorCommented:
Copying for data from one machine to another is also depended on read/write speed of the HDD.
Check your HDD health and chkdsk /f to fix any error's in the HDD.
timb551IT ManagerAuthor Commented:
It's all laptops though not just a single unit so I don't think it's a laptop disk issue. I will have to try and get another unit onto the network to see if it's a network card issue as they are all that type.
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Craig BeckCommented:
What switch do you have?
timb551IT ManagerAuthor Commented:
Dell powerconnect 2816
Tony GiangrecoCommented:
I'd start by upgrading the bios, firmware and drivers on each Pc/laptop, and switch.

Your anti virus & Firewall settings may also be inspecting each packet as it;s received. I've seen this before and it can really slow things down.

Check the link lights on the switch and Pc/laptops to make sure you are getting the Green LED instead of the amber. Normally amber means you don't have a gig connection.  You can also check on the Local Area Connection status on each Pc.

Are all clients running Win7 or higher?  Anything lower could really slow things down.
timb551IT ManagerAuthor Commented:
Clients are running 8.1pro.  I don't think it's the av as they are fine when running on wifi.

I'll run some tests on the switch to see if it's that.
Craig BeckCommented:
I don't think it's a client issue relating to AV, etc, either as it's OK via Wifi.

When you connect via wire, what link speed does the NIC report?
timb551IT ManagerAuthor Commented:
Its looking like a faulty switch.

I am undertaking tests at the moment.
Tony GiangrecoCommented:
Check the link lights on the switch and Pc/laptops to make sure you are getting the Green LED instead of the amber. Normally amber means you don't have a gig connection.  You can also check on the Local Area Connection status on each Pc

Glad I suggested you check the switch. It's impacted me before also. If you have a managed switch, go into it's stats and look for errors on each port.
timb551IT ManagerAuthor Commented:
Would you believe it was the cabling.

Never seen anythign like it.

The cabling was cat 6 and tested on a standard tester fine, but replaced the cables with new ones and the speed jumped to how it should be.

We have taken the cabling away to look into it further as we have never seen anything like it and we didnt put this cable in.

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timb551IT ManagerAuthor Commented:
Cabling issue in the end
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