Don’t Fragment bit

340 pts.
Tags:
Network protocols
TCP/IP
UDP
Could anybody please explain me about the data transfer when Don't fragment bit is set and incoming protocol is TCP/UDP?

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Here’s a good article on <a href=”http://www.tech-faq.com/packet-fragmentation.shtml”>Packet Fragmentation</a>.

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  • Kb0odl
    For DNS, the initial reply from an authoritative server is always UDP when answering a lookup query. If the amount of records to return for the answer is > the amount that will fit into a UDP packet (generally 512 bytes), the server will set the DF bit to let the requestor know that there is more data than will fit into a single UDP reply. If the requestor supports this communication, it will then setup a TCP session with the authoritative server to allow it to transfer the entire list of records for that query.
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