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Windows Server 2008 poor Leased Line Internet Speed

Posted on 2016-07-22
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Last Modified: 2016-08-30
Hello Experts

I have a bit of a NIC configuration problem with a server and it's under utilisation of a leased line internet connection on a single Windows 2008 Server.

In our office, we have a Virgin Internet provided 800 MB up/down Leased Line on a 1000 MB bearer circuit.  The internet comes from a Cisco 8000 Series router via an NTE box (both internet provider managed) to a Watch Guard M200 Firebox onsite.  From the Watch Guard's LAN port 1, there is a stand-alone Windows 2008 Server (non DC) with a statically assigned server IP address of 10.0.3.10 and the gateway of the Watch Guard port being 10.0.3.1

The Server is a HP DL380 G8 with 128GB of Memory, 2 X 8 Core 2.6 Xeon Processors and a RAID 10 Volume of 4 x 600GB 15k SAS Drives

The Network Card in the server is an Intel Chip Set, HP branded 4 Port Gigabit Card, model HP NC365ST PCIe Quad Port Gigabit Server Adaptor.

After the internet circuit was brought into service a week or so ago, speed tests (http://supportal-test.co.uk) from the Server are only showing a maximum of 515MB down and 534MB up

We have ran iPerf tests at the request of the internet provider and they can confirm from the results that the internet speed is correct at 800MB up and down.

The reason i need help is that when we powered up the server in safe mode (at the providers request) and ran the internet speed tests again,  to our surprise, the speed tests showed 775MB down and 766MB up.  It is only when the server is booted up in normal mode that the speed drops

Any help, guidance or direction is greatly appreciated, as always

Regards

Andy
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Question by:webpolsol
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10 Comments
 
LVL 4

Assisted Solution

by:El Fierro
El Fierro earned 500 total points (awarded by participants)
ID: 41725092
on the server: check the duplex settings on the nics, i had an update on a couple of my hps that changed the duplex settings.do not disable  ipv6 from the nic as well,i had a internal routing delay issue once turns out an check of the ipv6 box caused me a half day headache. double check your 3rd party security applications if you are running them on the server. live and learn moments haha good luck
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LVL 9

Assisted Solution

by:dipersp
dipersp earned 500 total points (awarded by participants)
ID: 41725133
I can't see it being the NIC settings - those don't change from safe mode to normal.  I would be looking at all of your third-party apps.  Any firewalls (besides the built-in) on the box that deal with traffic?  

Here's how I'd start if you don't mind (possibly) a lot of reboots on the box.  Run MSCONFIG.  Leave it as a normal startup on the first tab.  Third tab, check the box to hide all Microsoft services.  Then disable all.  On the startup tab, disable all.

OK and reboot.  Speed test.  If speeds are what you expect, go back to MSCONFIG and start turning things on.  Turn the most innocuous services and apps on first.  OK, reboot, test.  Keep doing this.  See if you find a problem child.
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LVL 5

Accepted Solution

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Mdlinnett earned 1000 total points (awarded by participants)
ID: 41725164
What happens if you take the WatchGuard out of the equation? The M200 datasheet indicates that the UTM throughput of the Firewall is 515 Mbps, which matches your max download speed.

I know you had better results in Safe Mode, but just try it to rule it out.
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LVL 17

Expert Comment

by:Gerald Connolly
ID: 41725747
Ambiguous terminology alert!   -   defacto standard is "b" = bits, "B" = Bytes
I assume the line speeds are in bits and not Bytes, so should read "800 Mb up/down Leased Line on a 1000 Mb bearer " or is it really a 10Gb bearer circuit?

but are you getting "515MB down and 534MB up" or "515Mb down and 534Mb up"
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LVL 1

Author Comment

by:webpolsol
ID: 41733491
hi all

The line is 800MB on a 1000MB bearer

We are going to disconnect the watch guard and test in the morning and run the tests again - i'll let you know what happens

Regards

Andy
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LVL 17

Expert Comment

by:Gerald Connolly
ID: 41734088
so its a 10Gbit bearer?
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LVL 1

Author Comment

by:webpolsol
ID: 41738086
No Gerald, 1 GB bearer
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LVL 17

Expert Comment

by:Gerald Connolly
ID: 41738862
webpolsol - thats the point i trying to get over - as i posted earlier "b" bit, "B" = Byte

1GB = 1 GByte which translates to 10Gbits of line speed (10 bit Bytes are used across a comms link for extra error correction)
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LVL 5

Expert Comment

by:Mdlinnett
ID: 41751069
What happened when the Firewall was taken out of the equation?
0
 
LVL 17

Expert Comment

by:Gerald Connolly
ID: 41776003
MDLINNETT proposed a potential cause of the slowdown which the OP was going to test, the fact that the OP hasnt responded we can assume a solution has been found
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