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][1] 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][2], 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. [1]: https://meta.stackexchange.com/q/66377/189912 [2]: https://serverfault.com/q/411165/126632