By nature of DoS, any such attack will be sufficiently long lived for tracking in such a fashion to be possible. Layer-three topology changes, while hard to mask to a determined attacker, have the possibility of alleviating the DoS until the routing change is discovered and subsequently adapted to. Once the attacker has adapted, the re-routing scheme can once again adapt and re-route; causing an oscillation in the DoS attack; granting some ability to absorb the impact of such an attack.