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dfb1f7ccf1
Check sender of all received packets, as specified in RFC 1350 para 4. My understanding of the example in the RFC is that it in fact only applies to server-to-client packets, and packet loss or duplication cannot result in a client sending from more than one port to a server. This check is not, therefore, strictly needed on the server side. It's still useful, and adds a little security against packet spoofing. (though if you're running TFTP on a public network with bad actors, nothing can really save you.)