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Thread: Router NAT Type?

  1. #1

    Default Router NAT Type?

    I have a stand-alone SIP phone (plugs direct to the router, has it's own local IP address). The STUN server I connect to says I am behind a Symmetric NAT, and Symmetric NAT's cause problems with SIP phones. However, I am not sure if the STUN server diagnosis of me having a Symmetric NAT is really correct (I think the phone may be sending the local IP address in the SIP header, and the STUN server misinterprets this).

    --> Is there some way (ex: a tool in BackTrack) that I can test a router to verify it's NAT type (Symmertic, Full Cone, Restricted Port, restricted Cone)?

    I looked in the GUI of my router, it offers port forwarding/triggering and static NAT, but no mention of the active NAT type.

    The link budget is not a problem, we intend on splitting the bill...

  2. #2
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    you can do what you need with NAT I got a DID to work with ipcall etc ..

  3. #3
    My life is this forum Barry's Avatar
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    Quote Originally Posted by operat0r View Post
    you can do what you need with NAT I got a DID to work with ipcall etc ..
    Whaa?


    Oh, hey raiders, digging your signature.
    Of course, if you really wanted to have some fun, go to Wal-Mart late at night and ask the greeter if they could help you find trashbags, roll of carpet, rope, quicklime, clorox and a shovel. See if they give you any strange looks. --Streaker69

  4. #4

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    Quote Originally Posted by operat0r View Post
    you can do what you need with NAT I got a DID to work with ipcall etc ..
    Whaa?
    Quote Originally Posted by Barry View Post
    Whaa?
    Oh, hey raiders, digging your signature.
    Ha-ha, this post had me rolling

    As far as the NAT question: I tried a few STUN servers and all said I'm behind a symmetric NAT, so "if it looks like a duck and quacks like a duck...".

    I found this explaining the procedure:
    http://www.ietf.org/proceedings/01au...-12/sld013.htm

    I'm thinking if I could write a script that could perform this from my website? ie: I type the URL of my web-server from a browser behind my NAT and the web-server could perform this test.
    The link budget is not a problem, we intend on splitting the bill...

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