You're absolutely right. I dropped some decimal places. Thanks! However, gateway addresses don't fit in a byte, they're stored in an unsigned long, which is 4 bytes each. 4 * 16 million, right? And I think you need counters and flags. So it's an array of structs of some modest size each. But I see a complication: You will have to have n entries per route, which will make loading the table a little less straightforward. That will take time, so the update process probably has to be run in a separate thread, and the current program isn't multithreaded. It'd be somewhat of a development chore. Still, I like the idea. - Brian On Mon, May 01, 2017 at 07:43:37PM +0200, Rob Janssen wrote: