Re: bridge detection

From: Aaron Berg (aaron_at_voyageurweb.com)
Date: 12/28/04

  • Next message: Paul Duffany: "RE: Lots of incoming traffic on UDP 1026 and UDP 1027?" 
    Date: Tue, 28 Dec 2004 12:41:30 -0600
To: ice4ice@excite.com

    One way of detecting a router, switch, bridge etc is to count the ttl
    from one location to another and compare it to the number of hops you
    see. For instance say your going from a main router to an ISP main
    router. There may be many different devices in between. Do a ping and
    set the time to live to 1. If the ping makes it there and back then you
    know there is nothing in between. If not set the ttl to 2, 3, 4 etc
    until you get a return ping. There are a few applications out there that
    will do this for you. Look for tcp based ping utilities such as TCPping.
    If any of the information I have provided is slightly off feel free to
    correct me.

    G.P.M wrote:

    >hi,
    > I was wondering are there any programs which can detect switches/routers, based as well on linux.
    > The problem is that one company is setting up large LAN, with internet access, based on static ip/mac address, for paying reasons. Many clients seperate their connection, often giving mac of the bridge not the PC.
    > i had many ideas about that, eg. checking the vendor for the mac, signal replays from the source.
    >i worry also about 'clear' switches, non programmable ones.
    >
    > Could please someone give me some advise?
    >
    >sorry for my bad english.
    >
    >_______________________________________________
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    -- 
Aaron Berg
VoyageurWeb Engineering
http://www.voyageurweb.com
  • Next message: Paul Duffany: "RE: Lots of incoming traffic on UDP 1026 and UDP 1027?"

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