Nothing can be assumed to be take a symmetrical return path. Even if I send a normal packet to some server on the Internet, the server's reply may or may not co

Nothing can be assumed to be take a symmetrical return path. Even if I send a normal packet to some server on the Internet, the server's reply may or may not come back using the same path. As a former Google employee, I remember vaguely that this is something Google occasionally does on purpose.