[ns] TCP/UDP overhead questions
xfan2517 at hotmail.com
Fri Feb 20 06:19:28 PST 2004
I am doing some simulations over wlan 802.11.
If I use TCP protocol, I see that when tcp source packetSize_ is set, say x,
the length of the packet through ether is
x+40(tcp)+20(ip)+52 (PLCP preamble(16)+PLCP header(8)+mac(28, in same BSS,
802.11 Spec 7.2.2) in bytes.
When UDP is used and packetSize_ is set, say y,
The total length is
The length of packets can be seen in both .tr and .nam files ..
I have two questions,
1. why is there a TCP overhead of 40 instead of 20,
2. Why is the UDP header of 8 bytes not included? bug?
any suggestions? many thanks in advance!
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