Routing through non-addressable space???

Can someone explain this trace to me. How on earth did the network get inserted into the last hop?

# IP address Host name Round trip time

4 64 ms
5 71 ms
6 Unavailable 79 ms
7 94 ms
8 No response
9 110 ms
10 112 ms
11 120 ms
12 Unavailable 134 ms
13 Unavailable 141 ms

Best Regards,


Some naughty person used RFC1918 address space to number their point-to-point
links? That's OK, until they throw an ICMP error that gets tossed by a
border router that does bogon filtering. Single biggest reason why
Path MTU Discovery doesn't work, except for maybe sites that stomp on all
the ICMP traffic they see....