Problems At The Network Layer
Because DIME was defined at the data link layer, it was possible to encapsulate a DIME message in another DIME message. This would not help at all for compression purposes, but was occasionally useful to bypass networking infrastructure such as routers at the network layer of the OS model, that would otherwise block the encapsulated traffic (being binary they may treat it with suspicion). That being said, other protocols such as MIME may equally suffer such. Since DIME was generally used between well-trusted clients, a specific port could be opened at the router for the express purpose of sending and receiving DIME traffic. This did not subvert the security aspects, since the challenge would still occur, merely that it accepted that binary traffic was the norm on that port, and not give numerous false positives.
Read more about this topic: Direct Internet Message Encapsulation
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