Ensuring 1gb ethernet connection across all computers

Posted on 2008-11-06
Last Modified: 2013-11-09
I recently had cat6 cabling installed, new switch and a new billion VGP7404 router which also handles the DHCP for a small network of 6 computers.

I've had new gb ethernet cards put into all my computers but I want to know if there is a way I can do a test to check that the ethernet speed between all computer is actaully 1gb and not 100mbps as some software I use on the network is very speed intensive

perhaps some kind of program or cmd script?
Question by:hubfub
    LVL 95

    Expert Comment

    by:Lee W, MVP
    The task manager, networking tab isn't cutting it?

    Also, keep in mind, actual speeds will vary due to a wide range of factors, including hard disk speed, network congestion, DRIVERS, file sizes, file fragmentation, electrical interference on the Cables (generally NOT a problem, but could be - only Fiber is not subject to electrical interference).

    LVL 27

    Assisted Solution

    When I plug in my cable into my NIC in Windows XP, it says "Connected 1GB".

    If you really want to run a test, find a very big file (aka BAF), and get a free FTP server and install it on computer A.  Then, FTP your BAF from B to A.  Or you could use TFTP.  They're well known protocols and you can calculate actual throughput and even account for protocol overhead if you want to geek out.
    LVL 1

    Accepted Solution

    You can lock the port speeds to only use 1GB on the switch, that will force the communications to 1GB, then use something like iperf to test the throughput point to point.
    LVL 1

    Author Comment

    how do you lock port speeds?
    LVL 7

    Assisted Solution

    Speed with the most common speed mesuring soft will show around 80% of 1000MB. This is normal.
    Actual file Transfer speed can be calculated, by transfering file (like 1GB size) , and mesure time it will take to transfer, to shared drive on network or else.
    I would not recomend disable auto/auto to full/1000...........If there is problem with NIC driver, cables, and so on, it will freak out connection. But keeping auto/auto will allow you to avoid by simply swiching back to 100MB. Also most of the drivers will report you 1G, when you connect cable, when in fact it still will be 100Mb, when do mesure tests.
    You will not achive more than 30MB on file transfer betwen two PC with 1GB over 1Gb link anyway, therefore making practicly no diffrents wich link you use 1gb or 100MB.
    Downloading files from SAN is diffrent story, and can get pretty high download speed - more than 100MB, and in this case 1GB willbe usefull.
    Also it will make a diffrent when you will do multiple file transfer, but then you more likely will be slowen down by your boxes performance.
    LVL 1

    Expert Comment

    Locking the speed will be specific to the switch mfg. What kind of switches are you using?

     As far as auto / auto . . switches if not locked at specific speeds / duplex, the devices can also auto-negotiate at the wrong speeds giving inconsistencies in data transmission rates.  For workstations, probably not an issue, for servers . . I always lock my port speeds and duplex on my switch at what I want them to be and avoid using the auto-negotiate
    LVL 6

    Expert Comment

    I don't suppose  your switch has different colors on the LEDs for different link speeds does it?


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