Kai Ponte wrote: > On Fri, June 15, 2007 12:09 pm, James Knott wrote: > > >>> As an example, in order to increase the security (by obscurity) of >>> our >>> voting tally systems, we use Token Ring on all election tally >>> systems. >>> There's only one machine with a token ring/ethernet bridge used to >>> pass data out. >>> >>> >> How does that improve security? IP doesn't care what the physical >> layer is. >> > > I didn't know they had IP drivers for token ring. We're using some > netBIOS sort of thing, AFAIK. > > You apparently get some layers of the protocol stack mixed up. The drivers are for the specific card, whether ethernet, token ring or other. Unix & Linux systems always support IP, no matter what the network type. Take a look at the ISO network protocol stack some time. While not a perfect match for TCP/IP, it conveys the general idea. The bottom layer is physical, describing cable types etc. Next up is the datalink, i.e. Ethernet, Token Ring etc. On top of that is the network layer, where IP fits.
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