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Re: [ns] Packet size
On Thu, 1 Feb 2001, Sridharan K Iyer wrote:
> If I set the packetSize_ for a TCP packet to, say, 1000 bytes, I am
> actually specifying the *data* to be 1000 bytes. What I expect is that a
> TCP header of 40 bytes
TCP header of 20 bytes.
IP header of 20 bytes.
ignoring options on both.
> must be added to this when the packet is passed
> down. And further, this extra header size *must* have an effect on the
> tx-time of the packet. But, when I observe the traces, I do not see
> the header overhead.
you're not using FullTcp.
> Am I missing something here? Where is the header size appended to the
> packet in the code?
Read the thread starting from 'Measure TCP throughput accurately' on
http://www.ee.surrey.ac.uk/Personal/L.Wood/ns/
(I went and dug that and the end-to-end delay awk script out of the
archives one last time, and put links to them in.)
L.
<[email protected]>PGP<http://www.ee.surrey.ac.uk/Personal/L.Wood/>