I remember that question.
The worst part of that particular question that you referenced was that the person who asked it refused to describe why he wanted to do what he was doing.
That's a problem, because it indicates the user has probably fallen into the XY problem trap.
There may actually be reasons why this particular solution might seem to be right, but without knowing the entire situation, it is impossible to say. For instance, a person might have thought of this as the solution to a bug in the firewall, where reconfiguring the firewall or updating its firmware would have been a better solution.
Instead of merely asking how to implement your "solution" (which might be a less than optimal solution) try focusing more on the problem you are facing, which led you to consider this solution.
