TCP fragmentation and wireshark

[Kevin Wilson <wkevils () gmail com>]

Hello,
I want to use wireshark sniffer for analyzing TCP fragmented traffic.
  I had written a small TCP client-server app, which creates large
packets (over 20 K) and sends them.
When I tried to sniff the traffic with wireshark, I saw single
packets, and no sign of fragmentation
(like ip frag_offset field, or ip more fragments field).
(I know for sure that the PMTU between client and server is 1500.)

Any ideas why ? or maybe my application is not good and I can use
existing applications?

rgs,
Kevin
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