Skip site navigation (1)Skip section navigation (2)
Date:      Thu, 10 Feb 2011 08:28:11 +0100
From:      Luigi Rizzo <rizzo@iet.unipi.it>
To:        nangergong <nangergong@gmail.com>
Cc:        freebsd-ipfw@freebsd.org
Subject:   Re: about "profile" in IPFW/dummynet
Message-ID:  <20110210072811.GA41597@onelab2.iet.unipi.it>
In-Reply-To: <AANLkTinuPw67g=aROMMA6EwFEdvswXD-jHwySwxGvYEP@mail.gmail.com>
References:  <AANLkTinuPw67g=aROMMA6EwFEdvswXD-jHwySwxGvYEP@mail.gmail.com>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
On Thu, Feb 10, 2011 at 12:09:09AM +0000, nangergong wrote:
> Hi, all:
> 
>    I want to use "profile" to simulate delays according to a empirical delay
> distribution ( the "profile" argument can be found in
> http://fuse4bsd.creo.hu/localcgi/man-cgi.cgi?ipfw+8)
> I use the following command lines and distribution.txt, and find that these
> command lines seem not to  function. when I ping 9.161.148.72, the RTT<1ms
> 
> My question is
> 1) can "profile" be used in windows platform
> 2) are there any problems in my procedures?

you need a non-zero bandwidth if you want to use "profile".
Also, "profile" emulates an additional transmission time
(think of channel arbitration and mac overheads)
not propagation delay.

Finally I believe profile works on all supported platforms.
In general, the differences between FreeBSD/linux/windows are
only in areas where certain kernel features are implemented
in different ways on different platforms -- e.g. sysctl,
reinjection, matching on pid/gid or other credentials, divert.

cheers
luigi
> 
> 
> my command lines are:
> 
> ipfw pipe 1 config profile distribution.txt
> ipfw add 100 pipe 1 ip from 9.161.150.55 to 9.161.148.72
> --------------------------------------------------------------------------------------
> if I input: ipfw pipe show
> 
> the result is:
> 
> 00001: unlimited         0 ms burst 0
>          profile: name "distribution" loss 0.850000 samples 100
> q131073  50 sl. 0 flows (1 buckets) sched 65537 weight 0 lmax 0 pri 0
> droptail
>  sched 65537 type FIFO flags 0x0 0 buckets 0 active
> 
> 
> the content of distribution.txt is:
> 
> name    distribution
> samples 100
> loss-level    0.86
> prob    delay
> 0       200     # minimum overhead is 200ms
> 0.5     200
> 0.5     300
> 0.8     1000
> 0.9     1300
> 1       1300
> #configuration file end
> _______________________________________________
> 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"



Want to link to this message? Use this URL: <http://docs.FreeBSD.org/cgi/mid.cgi?20110210072811.GA41597>