How can you simulate a networking application in c with osi layers which part of the code represents the layers in the osi?

Well its not too tough!We can do this in following way 1)For Physical layer define some file which will operate like system buffer and do include initial primitives that physical layer includes! Only write or something else 2)Data link layer functions should be defined in another file which will use physical layer structures as abstract data types. For this please physical level or any layer datastructures as structures and functionalities as pointer to function mapped with those correlated functions. 3)Network layer concerns are often related to subnet transport for this there is one requirement that you should use simple logical identification like define a dummy address that will be mapped as one particular record and can be identified with one particular host by running a same client program from different directories and primarily setting logical id like IP address and then retrieving only what is having 'myID:message ' lke structure ..................For other layers you can do same but I think one need some prior knowledge of Threading to define it more presentatively. I have made a simulation during my college days at MCA that was using a essential feature on WIN platforms that is NET command. I cannot write here in so short how can we do all that but If you feel above not helping write to me at rupesh_joshi@sify.com or rupesh.joshi@gmail.com Rupesh K Joshi