Questions

TCP/IP over satellite network

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TCP/IP over satellite network

bo_hnad0071
Hi i have final year project about improving the performance of TCP over satellite network, i dont know how to to design the betwork using opnet software , please could someone help me to do that i have no time left ...waiting for answer..
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    robo_dev

    Are you able to design any types of networks using opnet?

    Some networks work better with larger packets and fewer acknolowledgements, other networks work better with smaller packets and more acknowlegements (or some permutation of the above). How could you change the characteristics of the network traffic to best suit the characteristics of the link?

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    Absolutely

    I have never seen a question like that get any response beyond "do your own homework." I think you will not be a dung beetle in your next life.

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    robo_dev

    Socratic method and all....

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    Absolutely

    That was intended as a compliment, but have it your way.

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    dawgit

    someone is (probably) actuly studying those Dung Beetles. -d

    edited to un-spell the wrong Beatle. -d

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    Absolutely

    someone is (probably) actually studying those Dung Beetles.

    I'm sure there's an entomologist somewhere studying the Beatles as we speak, but I have no idea why you mention it, or the study of Beetles.

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    Dr Dij

    in a telecom class

    satellites have massive delays, 1/4 second or so each way I think when going out to geosync satellites (because they are orbiting so far out).

    As you said, larger packets, etc will increase performance. Not sure what else.

    Supercomputer ultra hi-speed lines use modified ethernet protocols with reduced ack sequences. This cuts delays dramatically.

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    normhaga

    I will not do your homework but I will suggest a starting point. There is an older transmission protocol called SEALINK that was, and is still used today that addresses the large transmission latency. If you were to start here and then adapt it, you might find most of your homework is done - except for the typing, that is.

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    I am by no means an expert, but I just finished reading this report. Thought that it might be of some use or interest.

    http://www.adec.edu/nsf/tcpip-performance.pdf

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    dawgit

    it does look a bit dated. You didn't happen to catch a date on that did you Michael?
    (I don't know why, but it looks famiular too. ?:| maybe I'm just getting old :0 )
    Good general info though, so a Thanks to you for it. -d

    edited to add:
    that stuff is still a bit controled to realy have a good discussion here. It could kind of make a person thaink where it's going to go. Sign of the times, I guess. -d

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    Sorry dawgit, but I did mention that I am not an expert on Satellite comms. I looked and the article was from 2000, but it was meaningful to me. I apologize for the dated material.

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    dawgit

    I'm not an <i>expert</i> in the Sat-Com field either, I hope that I didn't come off that way. Thanks for the info (date) BTW. (sorry it took me so long to reply). That sounds about right, alot has changed since then, but than again alot didn't as well. The basics are the same. And so is the security. Sad, but true. -d

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    robo_dev

    Are you able to design any types of networks using opnet?

    Some networks work better with larger packets and fewer acknolowledgements, other networks work better with smaller packets and more acknowlegements (or some permutation of the above). How could you change the characteristics of the network traffic to best suit the characteristics of the link?

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    0 Votes
    Absolutely

    I have never seen a question like that get any response beyond "do your own homework." I think you will not be a dung beetle in your next life.

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    0 Votes
    robo_dev

    Socratic method and all....

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    Absolutely

    That was intended as a compliment, but have it your way.

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    0 Votes
    dawgit

    someone is (probably) actuly studying those Dung Beetles. -d

    edited to un-spell the wrong Beatle. -d

    +
    0 Votes
    Absolutely

    someone is (probably) actually studying those Dung Beetles.

    I'm sure there's an entomologist somewhere studying the Beatles as we speak, but I have no idea why you mention it, or the study of Beetles.

    +
    0 Votes
    Dr Dij

    in a telecom class

    satellites have massive delays, 1/4 second or so each way I think when going out to geosync satellites (because they are orbiting so far out).

    As you said, larger packets, etc will increase performance. Not sure what else.

    Supercomputer ultra hi-speed lines use modified ethernet protocols with reduced ack sequences. This cuts delays dramatically.

    +
    0 Votes
    normhaga

    I will not do your homework but I will suggest a starting point. There is an older transmission protocol called SEALINK that was, and is still used today that addresses the large transmission latency. If you were to start here and then adapt it, you might find most of your homework is done - except for the typing, that is.

    +
    0 Votes

    I am by no means an expert, but I just finished reading this report. Thought that it might be of some use or interest.

    http://www.adec.edu/nsf/tcpip-performance.pdf

    +
    0 Votes
    dawgit

    it does look a bit dated. You didn't happen to catch a date on that did you Michael?
    (I don't know why, but it looks famiular too. ?:| maybe I'm just getting old :0 )
    Good general info though, so a Thanks to you for it. -d

    edited to add:
    that stuff is still a bit controled to realy have a good discussion here. It could kind of make a person thaink where it's going to go. Sign of the times, I guess. -d

    +
    0 Votes

    Sorry dawgit, but I did mention that I am not an expert on Satellite comms. I looked and the article was from 2000, but it was meaningful to me. I apologize for the dated material.

    +
    0 Votes
    dawgit

    I'm not an <i>expert</i> in the Sat-Com field either, I hope that I didn't come off that way. Thanks for the info (date) BTW. (sorry it took me so long to reply). That sounds about right, alot has changed since then, but than again alot didn't as well. The basics are the same. And so is the security. Sad, but true. -d