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Hi all, I am simulating a 4 hop static network with one TCP flow
between the sender and receiver. There are 2 scenarios: One scenario (let’s
call it scenario 1) is based on RTS/CTS message exchange for packets larger
than 1024 Bytes and the other one (scenario 2) does not use any RTS/CTS to send
data over network. When I monitor the behaviour of TCP in the network, I come
across the following issue: While scenario 1 has less average congestion window size and
flight size (number of sent and unacknowledged data in network) with higher
number of TCP retransmission in comparison to scenario 2, the goodput of
scenario 1 is greater than scenario 2!!! For measuring the goodput, I am monitoring the sent sequence
number by sender. So, for instance, at time 50sec, the sender in scenario 1 is
sending packet with sequence number 10000 while the sender in scenario 2 is
sending packet with sequence number 6000. Does anyone know the reason behind this? Thanks for your help Ehsan ----------------------------------------- Ehsan
Hamadani, PhD student Office: +44 (0)207 040 3886 |
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