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Re: [BPQ32] Link Timer question ?

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  • Bill V WA7NWP
    ... I learned today, that the slot machines at the casinos in Washington are just automated pull tab machines. Wow. X1J4 is amazing software. IP routing,
    Message 1 of 10 , Dec 2, 2010
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      On Thu, Dec 2, 2010 at 10:06 PM, Bill <n9acq@...> wrote:
      >
      >
      >
      >                 Better yet. I learn something every day.


      I learned today, that the slot machines at the casinos in Washington
      are just automated pull tab machines. Wow.

      X1J4 is amazing software. IP routing, deviation meter, digipeating,
      L4 node functions and it can even pass all the packets it hears out
      the serial port in KISS protocol. That's the sole reason I have a
      box of MFJ 1270 TNC's waiting to be tuned up and put to use as nodes.

      X1J4 is available as source though the compile chain to make it work
      is apparently a serious challenge. One fellow did a few years ago
      and the result is the UI-DIGI APRS firmware.

      Ah for the good old days of node hopping...

      73
      Bill - WA7NWP
    • John Wiseman
      Bill The node normally keeps a link open to each NETROM neighbour. This ensures that nodes are actually reachable - you can get routing problems if you hear
      Message 2 of 10 , Dec 3, 2010
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        Bill
         
        The  node normally keeps a link open to each NETROM neighbour. This ensures that nodes are actually reachable - you can get routing problems if you hear nodes that can't hear you.
         
        In your situation of 5 nodes on one frequency, the overhead of this may be too much. The real answer is a better network design, but you can turin off the link verification by adding
         
        NOKEEPALIVES=1

        to the PORT configuration of yout RF port. You will then only open up links to nodes when you have traffic to pass.

        You can fiddle with the link verification timer, but this is there to make sure failed links are detected, so I wouldn't recommend running at much more than the standard 180 seconds. Sometimes you will see both ends of the link sending a verification poll (RR P) at the same time, doubling the overhead. If this happens set the timer at each node to a slightly different value - say 290, 295, 300, etc..

        With 5 nodes on a 1200 bps channel you will also need to manage the NODES broadcasts carefully to avoid filling the channel with NODES broadcasts.

        73,

        John

         

         

         

         

         

         

        -----Original Message-----
        From: BPQ32@yahoogroups.com [mailto:BPQ32@yahoogroups.com] On Behalf Of Bill Erhardt
        Sent: 03 December 2010 03:06
        To: BPQ32@yahoogroups.com
        Subject: [BPQ32] Link Timer question ?

         

        Howdy from Bill,
         
        After watching all this run now for a couple days, I asked myself why is the link timer pinging every two minutes. Can I set it to say 5 minutes and stop some of the extra RF traffic out there.
         
        The X1J4 nodes are also set to two minutes and they are just pinging like heck out here.  I know there are like 4 and I am now the 5th Node all within hearing distance of each other and maybe this is a problem There are 4 X1J4 on Mountain Tops all within 40 miles of each other and I can hear all 4 of them at my house with BPQ 32. Man what a lot of rf packet racket doing link tests.....
         
        Just wondering as this is my first time as a sysop sorta kinda......
         
        Bill K7MT

      • John Wiseman
        Oops - too early in the morning! I meant set timers either side of 180 - say 175, 180, 185 ... From: BPQ32@yahoogroups.com [mailto:BPQ32@yahoogroups.com] On
        Message 3 of 10 , Dec 3, 2010
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          Message
          Oops - too early in the morning! I meant set timers either side of 180 - say 175, 180, 185
           
           
          -----Original Message-----
          From: BPQ32@yahoogroups.com [mailto:BPQ32@yahoogroups.com] On Behalf Of John Wiseman
          Sent: 03 December 2010 09:57
          To: BPQ32@yahoogroups.com
          Subject: RE: [BPQ32] Link Timer question ?

           

          Bill
           
          The  node normally keeps a link open to each NETROM neighbour. This ensures that nodes are actually reachable - you can get routing problems if you hear nodes that can't hear you.
           
          In your situation of 5 nodes on one frequency, the overhead of this may be too much. The real answer is a better network design, but you can turin off the link verification by adding
           
          NOKEEPALIVES=1

          to the PORT configuration of yout RF port. You will then only open up links to nodes when you have traffic to pass.

          You can fiddle with the link verification timer, but this is there to make sure failed links are detected, so I wouldn't recommend running at much more than the standard 180 seconds. Sometimes you will see both ends of the link sending a verification poll (RR P) at the same time, doubling the overhead. If this happens set the timer at each node to a slightly different value - say 290, 295, 300, etc..

          With 5 nodes on a 1200 bps channel you will also need to manage the NODES broadcasts carefully to avoid filling the channel with NODES broadcasts.

          73,

          John

           

           

           

           

           

           

          -----Original Message-----
          From: BPQ32@yahoogroups.com [mailto:BPQ32@yahoogroups.com] On Behalf Of Bill Erhardt
          Sent: 03 December 2010 03:06
          To: BPQ32@yahoogroups.com
          Subject: [BPQ32] Link Timer question ?

           

          Howdy from Bill,
           
          After watching all this run now for a couple days, I asked myself why is the link timer pinging every two minutes. Can I set it to say 5 minutes and stop some of the extra RF traffic out there.
           
          The X1J4 nodes are also set to two minutes and they are just pinging like heck out here.  I know there are like 4 and I am now the 5th Node all within hearing distance of each other and maybe this is a problem There are 4 X1J4 on Mountain Tops all within 40 miles of each other and I can hear all 4 of them at my house with BPQ 32. Man what a lot of rf packet racket doing link tests.....
           
          Just wondering as this is my first time as a sysop sorta kinda......
           
          Bill K7MT

        • Bill Erhardt
          Hi Gang, Thanks for all the great information. I will study up on thi area and learn. You have given me to push to try and better understand and how to
          Message 4 of 10 , Dec 3, 2010
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            Hi Gang,
             
            Thanks for all the great information.  I will study up on thi area and learn.  You have given me to push to try and better understand and how to experiement.
             
            John, your right in that my station radio is a Kantronics DVR 2-2 on packet BPQ node and also on APRS as my station is on solar. The nodes out there are 25 watts DR-1200t and GE Phoenix;s at 8000 feet. I am at a disadvantage with 2 watts. Hearing a lot but not sure they are hearing me...
             
            Thanks gang and Happy Holidze.  Still having loads of fun learning on this geat adventure.  The few headaches are just a minor inconvience..
             
            Bill K7MT
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