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Re: [ns] TCP source dropping packets

Hi Adeel,

  Thanks for your reply. In my case the link delay varies between 30 to 150ms, and the link bw is 100Mbps. So I wouldn't consider this as small delay, but I have made my TCP window size extremely large. I was thinking the reason for source to drop packets is, when the cong window is increasing, the source may not be able to pack more than BW*Delay bytes into the link, if the window is bigger than the BW*Delay product, it can drop packets at the source. Is my argument valid ??

Thanks,

Vijay

>From: Adeel Baig
>To: VJ VJ , [email protected]
>CC: [email protected]
>Subject: Re: [ns] TCP source dropping packets
>Date: Wed, 28 Mar 2001 16:23:31 -0800 (PST)
>
>Hi
>About the drops at the source.It also depends on the
>link delay.If you keep the delay very small then u
>will observe the drops at the source.
>About the default queue size .. yes there is a default
>queue size in the link which is 50.You can manipulate
>it by changing it in ns-default.tcl.
>
>Hope this will help.
>Best of Luck
>
>-Adeel
>
>--- VJ VJ wrote:
> > Hi,
> > Iam trying to simulate multiple source nodes
> > (n0,n1,n2,n3) simultaneously
> > sending traffic to node n5 through a bottlneck node
> > n4. From the nam
> > simulation, I can see source node dropping packets,
> > the
> > problem goes away when I introduce a buffer to the
> > links attached to
> > nodes n0 to n4 or n1 to n4 or n2 to n4 or n3 to n4.
> > But I see the source
> > dropping packets with buffering for some other link
> > bw/delay combination.
> > Does anyone have any insight to this problem, how
> > does the ns-2 behave when
> > no buffer is attached to the link ? does it have any
> > default queue size
> > attached to the link ? Any help will be of great use
> > to me.
> >
> > Thankyou very much,
> > Vijay
> >
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