[wmf]

If you return fake IPs in a traceroute you won't be able to control the reverse DNS which is the point of this exercise.

[prvit]

You can however control the IPs, so you can pick IPs with funny nsa.gov/.mil/fbi rdns (and matching forward records).

[kadoban]

I understood this current thread to be another, separate, stupid ICMP trick. I wouldn't think the two tricks can be combined.