about "profile" in IPFW/dummynet
Luigi Rizzo
rizzo at iet.unipi.it
Thu Feb 10 07:30:15 UTC 2011
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
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