--- Ed Wildgoose <lists@xxxxxxxxxxxxxx> wrote: > Hi Mike, > > >Cable, being Asymetrical, is able to upload at a given rate and > hopefully > >has a buffer, in the modem, of some kind. When I nc(netcat) to a UDP > >echo, or discard, server I get about 10Mbps out on my ethernet, but > only > >256Kbps acctualy receved(reported by an open echo server). Other > traffic > >on the link suffers grately from this, so I don't do it oftan :) I use > >htb to curve this and that seams to work nice. > > > >NO REALY MY CABLE MODEM DOSEN'T MAKE ANY ATTEMPT TO, CALL FOR HELP, > >CONTROL THE FLOW(aka flow-control, supported by ethernet and rs-232). > > > > > > There is no such flowcontrol in ethernet or rs232. TCP only indicates > congestion by dropping packets. There is something called ECN, but it > is rarely implemented (and tests suggest that it doesn't help as much as > > theory might like). > http://www.lammertbies.nl/comm/info/RS-232_flow_control.html ECN is software flow control. There is also icmp for software FC? The idea is too prevent 'buffer underruns' in the modem, any SNMP or other stats on this buffer would also provide SWFC. http://www.nwfusion.com/netresources/0913flow.html This is ethernets HWFC, that any directly connected modem could use. The idea then is for the directly connected computer to use SwFC(ECN or ?icmp?) to pass this FC onto other hosts using the modem. > Ed W > Thanx Ed. Mike M __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail _______________________________________________ LARTC mailing list / LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
