Hi. yes afaik you're right: the ipac (for 2.2) and ipac-ng (vor 2.4) "just" insert iptables-rules in INPUT/OUTPUT/FORWARD, and so they don't see the "droped/delayed-because-of-shaping" packets.. the only solution i know is ugly and/or unpractiable: read the interface-stats from /proc/net/dev. but that's only usable, if 1. you have 1. interface/customer 2. you don't need to account certain ports as i said: it's in most cases no solution... With Patrick's imq-devices you can at least compute the "droped/delayed-because-of-shaping" packets: these imq-devices display in /proc/net/dev the ammount of packets/bytes that SHOULD have deliverd as RX, and the actual REALLY ammount of packets/bytes delivered to the interface as TX. But that's not really useful for your setup :( Greetings Tobias > Hello, > > A while ago now I had to set up a traffic shaper for the ISP I work > for, and I used linux and cbq.init to accomplish this. It worked > reasonably well, too, but after a while and some double-checking it > turned out that the ipac accounting on the same machine was > consistently reporting higher usage than was actually the case by > roughly the same factor (not amount) for every client. > > After a lot of thinking about this, the only conclusion I could reach > that didn't involve a gross and so far completely undiscovered > programming flaw in ipac or TCP/IP gremlins was that the difference was > caused by traffic shaping occuring at the point where packets exit the > machine while ipac does its accounting of packets at the point where > they enter. > > Am I right, or am I just blowing smoke and moondust, and in either > case, is there any way to correctly shape and account traffic on one > machine? > > Thanks, > -- > Rens Houben | opinions are mine > Resident linux guru and sysadmin | if my employers have one > Systemec Internet Services. |they'll tell you themselves PGP > public key at http://suzaku.systemec.nl/shadur.key.asc -- new Dec 12 > 2001 _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
