Slow window share download, but fast ftp download?

Discussion in 'Server Networking' started by federico, May 14, 2008.

  1. federico

    federico Guest

    Hello, we are experising slow file transfer rates between servers linked by
    ipvpn (by Time Warner). The slow transfer rates only occur when moving
    files between windows shares. Ftp transfers are many times faster. I tried
    disabling fair-queue and cdp in the routers at both ends of the connection
    to no avail. Please, any pointers would be greatly appreciated.

    federico, May 14, 2008
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  2. In
    Windows communication is comprised of a complex series of protocols and APIs
    using RPC to communicate, which uses Kerberos for authentication. There is
    much going on during the session. These are looked at as a 'heavy weight'
    for file transfers. One thing to look for to ensure no hinderance is that
    ALL ports must be wide open between locations (no firewall between
    locations). Another is to ensure that the MTU is no less than 1500 on both
    routers/VPN devices.

    FTP has ALWAYS been faster because it is simple binary data transfer over
    TCP. It is optimized for file transfer, hence it's name. However it is no
    where near secure like Windows communications.

    I am curious about the Time Warner VPN. What type of line did they provide
    you? Is it cable? Keep in mind cable is asynchronis tranfer, meaning the
    download is MUCH faster than the upload speed). FIOS is faster than cable.
    Cleaner too. How about what type of equipment connects the two locations? Or
    does it go to their system through their cloud?

    Of course the bettter bet is a digital leased line, like a T1.

    For our clients, we implement a Cisco PIX at each location, whether cable,
    T1, FIOS, SDSL (not ADSL) is very fast. I'm not saying it's faster than FTP,
    but there is no complaints about slowness from what you're implying. So I am
    thinking it may be something in the way they implemented the tunnel.


    This posting is provided "AS-IS" with no warranties or guarantees and
    confers no rights.

    Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT,
    MVP Microsoft MVP - Directory Services
    Microsoft Certified Trainer

    For urgent issues, you may want to contact Microsoft PSS directly. Please
    check for regional support phone numbers.

    Infinite Diversities in Infinite Combinations
    Ace Fekay [MVP], May 17, 2008
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