wireshark-users October 2010 archive
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wireshark-users: [Wireshark-users] Bytes on wire/bytes captured

[Wireshark-users] Bytes on wire/bytes captured for TCP traffic is larger than MTU

From: Mark Ryden <markryde_at_nospam>
Date: Sat Oct 09 2010 - 14:13:34 GMT
To: wireshark-users@wireshark.org

Hello,

 I am sniffing with wireshark TCP iperf traffic on a machine where the
NIC has an ordinary NIC.
The MTU of the NIC on the client and the server is the default value (1500).
        
I see in the sniff that some of the frames have (2962 bytes on
wire,2962 bytes captured)
and also that the ip header Total length is 2948. My question is: how can it be
that I am getting size of a packet which is almost twice the size of MTU ?
AFAIK, you cannot receive/send packets larger than the MTU without
fragmentation,
and what I see does not show fragmentation.
        
Rgs,
        Mark Ryden
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