SBS behind NAT router / firewall ... any known issues with NAT inside NAT?

Discussion in 'Windows Small Business Server' started by Blondie, May 24, 2005.

  1. Blondie

    Blondie Guest


    I just re-configured an SBS2003 Server to use two NICs and noticed a message
    that appears to indicate that the SBS2003 connection includes NAT (Network
    Address Translation) ... however the 'external connection' is already within
    a Private Address space behind a NAT router (SBS2003 External IP =

    The Hardware router has the Internet Static IP address and provides.

    So ... I think that NAT implementation uses a portion of the data packet to
    carry the NAT data ...

    Now I am wondering ... does this introduce a potential data corruption

    Is there a requirement to reduce the MTU setting to accomodate nest NAT

    Everything seems to be working, but I haven't done any specific testing to
    verify the data integrity of maximum size IP Packets transferred over the
    Blondie, May 24, 2005
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  2. Blondie

    Matt Gibson Guest

    Nope. AFAIK, it'll fragment if needed, but I've never noticed a problem,
    and I run back-to-back NAT at most of my SBS installs.

    Matt Gibson - GSEC
    Matt Gibson, May 24, 2005
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  3. Blondie

    Blondie Guest

    Thanks Matt!

    Blondie, May 25, 2005
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