Differentiating different protocols in UDP packet

[Vinay Kumar L <vinaykumar.l () globaledgesoft com>]

Hi All,

I have a doubt regarding differentiating different protocols in UDP 
packet by wireshark. Protocols like DNS, RTP....etc uses UDP, so after 
UDP header the corresponding headers(DNS, RTP...etc)appears in Wireshark 
capture. How does the Wireshark determines particular protocol headers 
after UDP header in UDP packet as the packet contains bulk of 
data(headers, payload) after UDP header? Does each protocol have 
specific id for identification? If yes, which part of header contains 
that id field?
Please guide me.

Thanks and Best Regards,
Vinay

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