Date: Tue, 4 Jan 2011 15:52:53 +0100 From: Luigi Rizzo <rizzo@iet.unipi.it> To: nangergong <nangergong@gmail.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: How to obtain fixed packet loss ? Message-ID: <20110104145253.GB8235@onelab2.iet.unipi.it> In-Reply-To: <AANLkTinHW9wOyf1woxGLMurEsF=Yk3M8wt7%2BFM-C_9ya@mail.gmail.com> References: <AANLkTinHW9wOyf1woxGLMurEsF=Yk3M8wt7%2BFM-C_9ya@mail.gmail.com>
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On Mon, Jan 03, 2011 at 06:22:54PM +0000, nangergong wrote: > Hi, all: > > As far as I know, in dummynet, plr is prabability-based, namely, when a > packet is processed, it will be discarded according to the probability. So, > if I have 100 packets and the plr is 5%, eventually I may just discard 3 > packets or even 1 packets. So, the real packet loss is not consitent with > the plr-set value. Is there any good method that can give me a consistent > packet loss? Thank you! you would need to modify the "prob" option in ipfw so that e.g. you specify a bitmap indicating the pattern of packet pass/drop (this was the way i originally implemented packet loss back in 1995!) cheers luigi > _______________________________________________ > freebsd-ipfw@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-ipfw > To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org"
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