Heya,
Physical attacks are always rather inconvenient. Though if it's one person with more computers he won't have a different ip range from every package unless he spoofs his host constantly.
To your question: There are ways to backtrace an ip adress, and can be done to trace the route as far back as it goes. All other ips he passes will be recorded and he won't be able to spoof those.
Anyway that's as much as I know about it, there are people far more experienced in this stuff, and best changes are another hacker... 
Greetings Dre |