Solved

Intermittent Network issues between server and client machines

Posted on 2011-09-09
10
1,960 Views
Last Modified: 2012-05-12
Hey everyone,

Having an issue that is really kicking my ass over here.  For a while now I've been dealing with intermittently slow network access at one of my clients, where, for instance, at random times throughout the day they'll open a word document and it'll take 30+ seconds to open it and it has a download bar at the bottom of Word.  This will happen for  several documents and then stop.  But this is with different programs, not just Word.  

I have the AntiVirus scans turned off, Firewall Off, tried a different switch and cables, I ran Wireshark and it was giving gopher requests errors and that's why I disabled the Checksum Offload on all of the NICs.  When they access files these come up in Wireshark:

Header checksum: 0x0000 [incorrect, should be 0x5db3 (maybe caused by "IP checksum offload"?)]
Duplicate to the ACK in frame: 647
This frame is a (suspected) fast retransmission


Here are the NIC settings for the server (I've tested with most settings individually over time):
Ethernet@WireSpeed = Disabled
Flow Control = TX & RX Enabled
Interrupt Moderation = Enabled
IPv4 Checksum Offload = None
IPv4 Large Send Offload = Enabled
Jumbo Packet = 1500
Locally Administered Address = Not Present
Number of RSS Queues = Auto
Priority & VLAN = both enabled
Receive Buffers (0=Auto) = 0
Receive Side Scaling = Enable
Speed Duplex = 100 Mb Full (this used to be 1Gb Full but we're testing a different switch)
TCP Connection Offload (IPv4) = Disabled
TCP Connection Offload (IPv6) = Disabled
Transmit Buffers (0=Auto) = 1500
VLAN ID = 0

NIC Settings for the Client Machines:
Ethernet@Wirespeed = Enabled
Flow Control = Disabled
Interrupt Moderation = Enable
Large Send Offload (IPv4) = Enable
Large Send Offload v2 (IPv4) = Enable
Large Send Offload v2 (IPv6) = Enable
Network Address = Not Present
Priority & VLAN = both enabled
Proxy ARP Offload = Enable
Proxy NS Offload = Enable
Speed and Duplex = Auto
TCP/UDP Checksum Offload (IPv4) = Disable
TCP/UDP Checksum Offload (IPv6) = Disable
VLAN ID = 0
WOL Speed = Lowest Speed Advertised

The last time I did a copy/paste on a file it went right away, now for some reason it's transfering at 100-150KB per second which is obviously way to slow.  

I'mn honestly at a total impass and banging my head on the wall as are my clients.  Any help would be immensely appreciated.

Thanks,
Adam
0
Comment
Question by:blue92lx
  • 4
  • 3
  • 3
10 Comments
 

Author Comment

by:blue92lx
ID: 36512615
Also I just did an internet speed test on the server and a client machine and I'm getting 5Mbps download on both.

Then I did a copy from a client computer to the server and it was copying at 5MBps, but if I copy from the server to the client it still copies at 100-150KBps.
0
 
LVL 3

Expert Comment

by:shbasm
ID: 36512617
do you use fiber optic cables
what kind of switches are you using
0
 

Author Comment

by:blue92lx
ID: 36512678
Right now the switch is a standard Linksys 16port unmanaged switch.  Regular ethernet cables, no fiber optics
0
PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

 
LVL 3

Expert Comment

by:shbasm
ID: 36512851
and that switch is with external ac adapter ?
0
 
LVL 3

Expert Comment

by:shbasm
ID: 36512862
if so test it by a multimeter secondly you need to swap the cable between client and server then the nic card on the client
0
 
LVL 6

Expert Comment

by:nativevlan
ID: 36512978
Is this only for Office documents?
0
 

Author Comment

by:blue92lx
ID: 36512992
This is an issue for anything network related. Like I was saying even doing a copy/paste has issues.

Also the switch is the 2nd switch we've used and I tried today with a new ethernet cable and neither worked.
0
 
LVL 6

Accepted Solution

by:
nativevlan earned 500 total points
ID: 36513006
If the switch is unmanaged you will want to set the server nic to auto. The switch won't be able to negotiate speed duplex if the nic is statically configured and it will default to half duplex.
0
 

Author Comment

by:blue92lx
ID: 36513304
I am so unbelievably angry right now because NativeVLan's answer was correct.  I have dug through every single aspect of every computer on this network without an answer and I have never in my 5 years of IT seen a server set to auto, or for that matter, I have never set a NIC anywhere to a manual speed/duplex setting and had it run worse.

Native you saved my life because I know if I was getting fed up and angry then my clients must be ready to throw something through the window.  A million points to you sir
0
 
LVL 6

Expert Comment

by:nativevlan
ID: 36513334
No problem. I just had the same issue a few days ago :)
0

Featured Post

Easy, flexible multimedia distribution & control

Coming soon!  Ideal for large-scale A/V applications, ATEN's VM3200 Modular Matrix Switch is an all-in-one solution that simplifies video wall integration. Easily customize display layouts to see what you want, how you want it in 4k.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Accessing SQL Server Instance from outside the network 29 140
QoS for Voip 7 54
How to change the nameserver on Ubuntu Server 6 48
Changing password for HP switch 5 32
Most of the applications these days are on Cloud. Cloud is ubiquitous with many service providers in the market. Since it has many benefits such as cost reduction, software updates, remote access, disaster recovery and much more.
I had an issue with InstallShield not being able to use Computer Browser service on Windows Server 2012. Here is the solution I found.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Internet Business Fax to Email Made Easy - With  eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, f…

791 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question