Hi Maiko. > I'm not sure what mode I would want to use it for though. I even > considered using JNOS as an IP bridge using the MultiPSK modem to > transport RAW IP (more or less) frames over HF, as one example > of what was on my mind.
I played with http over ax.25 slow 1200bd line. I wrote a simple sw package using Linux ax.25 kernel stack. One installed a http proxy on his computer, which initiated ax.25 connection to a server, queried for a page, the other side compressed it with gzip, sent over ax.25 channel, the http proxy decompressed and fed to the browser. It worked remarkably well for text only pages, but the SW was not debugged enough to be published. Anyway, the sources are here: http://www.kufr.cz/~ok1iak/download/ham/axw3.tar.gz >From my experience, routing IP over any other slow connected low quality link does not work well. The overhead of layering two complex connected protocols one over another is too big for slow links. Their acknowledge mechanism will add protocol delays in case of failure, one protocol's packet repetition will interfere with the other one's. Even running TCP over some slow unacknowledged link like ax.25 uproto will not work well, because the TCP connection is initiated at the end nodes, which have the parameters set up for much faster links. If they adjust, it will take a looong time, effectively becoming unusable. Application gateway is a way to go for HAM radio IMHO, not packet gateway. 73, Vojtech OK1IAK
