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kommunikation mellem klienter i IM



Hej,

jeg sidder og spekulerer lidt over kommunikation mellem klienter og serveren i en instant messengeing - applikation.

Når klienterne (som oftest) befinder sig bag en NAT-router kan de ikke tale direkte sammen, så de benytter serveren som mellemmand til kommunikationen gennem en TCP-forbindelse. Men burde det ikke være muligt for klienterne at indsætte serverens IP-adresse og portnumre i afsenderfelterne i de pakker, som de så direkte sender til hinanden? NATen kan så vel ikke se forskel på om pakken kommer fra serveren eller den anden kient?

Eller bliver nogle af felterne sat på et lag, hvor programmøren ikke har adgang, da det foregår i hardware? Har jeg overset noget indlysende?

Siemen

 
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