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Date:      Tue, 26 Sep 2006 13:23:37 +0300
From:      Nikos Vassiliadis <nvass@teledomenet.gr>
To:        freebsd-questions@freebsd.org
Cc:        Sushant Sharma <sushant@cs.vt.edu>
Subject:   Re: Dummynet Question
Message-ID:  <200609261323.38104.nvass@teledomenet.gr>
In-Reply-To: <20060925220057.hqu0378bjk04gccg@webmail.cs.vt.edu>
References:  <20060925220057.hqu0378bjk04gccg@webmail.cs.vt.edu>

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On Tuesday 26 September 2006 05:00, Sushant Sharma wrote:
> Hi all,
> I have installed dummynet on a machine-2 which I am using to introduce
> delay between the packets that I'll be sending from machine-1 to machine-3.
> I am using ping to confirm that ICMP/TCP packets are getting delayed. I
> know both UDP/TCP fall under ip, so UDP packets should also be getting
> delayed but just to confirm, do you guys know of any utility that I can use
> to check if UDP packets are also getting delayed.

Use traceroute. Or you could run tcpdump on both ingress and egress
interfaces and check the timestamps. netcat can send udp packets,
bash can(if it's built this way) cat >/dev/udp/192.168.0.1/snmp for example

Or you could simply trust dummynet/ipfw. They work:)

HTH, Nikos



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