I want to create a device of some sort where I am absolutely positive that only UDP traffic can pass one way. Of course I could setup whatever old router I might have, the thing is I want to make it as small as possible and with as little power consumption as needed. What components could or should I use for such an application?
Answer
You need a device with two ethernet ports and filtering capability. Such as an advanced router. Or if you posses the ability to program it, a micro-controller with two Ethernet interfaces or two interface chips and a lot software work.
UDP is a principle that has to be filtered out by a level of package inspection at least, at any lower level it's just bits passing through.
A router "certified" for UDP package filtering (there are plenty, if you pay attention) is probably the more affordable ready-made option you have, where you only need to click a few check boxes.
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