Re: network troubleshooting

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Jonathan Lotman [MSFT] (a-jonlot_at_online.microsoft.com)
Date: 10/09/04 

Date: Sat, 09 Oct 2004 04:29:00 GMT

Yes, if the server is dropped to 100Mb/s, clients that are on connected to
the switch with gigabit links will only be able to communicate with it at
100Mb/s. In the vast majority of small business environments, this is not
a bottleneck, as the advantages of gigabit ethernet do not become visible
unless you are doing sustained large file transfers from multiple client
connections to the server.

Jumbo frames are a revision of ethernet standards that permit a maximum
frame size of 9000 bytes, as opposed to the 1500 byte maximum frame size of
traditional ethernet. Offloading is where the NIC rather than the CPU
handles the processing of tasks such as checksum validating. We have seen
issues with both of these features where they have caused latency and/or
packet loss, so in issues where gigabit NICs are in use disabling them is a
common troubleshooting step. To do so, go to the properties of your LAN
network adapter, and on the General tab, click Configure, then go to the
Advanced tab. You should see the Properties listed for your adapter, and
the disable option is on the right. Try dropping the server to the lower
speed and see if that improves for the clients. If not, try reducing the
settings on the client, and then swapping in a different switch between the
downgraded client and server if things still do not improve.

Thank you,
--------------------------
Jonathan Lotman
Microsoft Online Support Engineer

Microsoft Corporation
Get Secure! - www.microsoft.com/security

=====================================================
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--------------------
| From: "Param R." <pr@nospam.com>
| Subject: Re: network troubleshooting
| Date: Fri, 8 Oct 2004 18:31:20 -0500
| Lines: 70
| Newsgroups: microsoft.public.windows.server.sbs
|
| Jonathan, thank you for the response. If I bring down the gigabit NIC to
| 100MB Full Duplex, wouldnt I lose any gigabit connectivity with PCs that
do
| have gigabit adapters? What are jumbo frame and offloading features and
| where can I find them on the NIC?
|
| thanks,
| Param
|
|
| "Jonathan Lotman [MSFT]" <a-jonlot@online.microsoft.com> wrote in message
| news:U7AJIlXrEHA.752@cpmsftngxa06.phx.gbl...
| > The netmon tool that comes with SBS2003 can be useful isolating network
| > issues. However, I would first recommend bringing the gigabit NIC
down
| > to
| > 100Mb Full Duplex, as well as going into the properties of the NIC and
| > disabling any jumbo frame and offloading features. As far as testing
| > line
| > speeds, a simple test might be to set up an FTP site on the LAN
interface
| > of the server and then transfer a large file to it and see what the
| > sustained transfer rate is. Externally, there are a number of sites
that
| > can give you a line speed test on the WAN side, but I suspect that the
| > issue is more in your local network than with your ISP, based on your
| > description.
| >
| > Thank you,
| > --------------------------
| > Jonathan Lotman
| > Microsoft Online Support Engineer
| >
| > Microsoft Corporation
| > Get Secure! - www.microsoft.com/security
| >
| > =====================================================
| > When responding to posts, please "Reply to Group" via
| > your newsreader so that others may learn and benefit
| > from your issue.
| > =====================================================
| >
| > --------------------
| > | From: "Param R." <pr@nospam.com>
| > | Subject: network troubleshooting
| > | Date: Fri, 8 Oct 2004 10:17:31 -0500
| > | Lines: 17
| > | Newsgroups: microsoft.public.windows.server.sbs
| > |
| > | Hi all, we are experiencing some network latency in our SBS network
| > | environment. The SBS server has 2 NICS as follows:-
| > |
| > | Internal GIGABIT Nic plugged into gigabit switch where other PCs
plugin.
| > | External 10/100 NIC plugged into linksys router for gateway to
internet.
| > |
| > | Our users are experiencing very slow internet browsing and also slow
| > file
| > | copy times over the network. We have contacted our ISP and they came
| > back
| > | with our line is OK.
| > |
| > | Are there any free tool out there that I can use to monitor the
network
| > to
| > | see what is going on? Test line speeds between a particular client and
| > the
| > | server etc?
| > |
| > | TIA!
| > |
| > |
| > |
| >
|
|
|

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