Main reason: You need to have reverse DNS that resolves each IP address to the appropriate Star Wars line. You don't have control over the reverse DNS for IP space you don't own (such as 10.0.0.0/8). Without the reverse DNS you'd just see IP addresses in the traceroute output, and no "It.is.a.period.of.civil.war."
Secondary reason: To prevent IP address spoofing, many routers have "reverse path filtering," which drops packets with source IP addresses that shouldn't be coming from the interface they're coming from. This would put a stop to the ICMP TTL exceeded messages and you'd just see stars in the traceroute output.
There is a surprising amount of unused IP address space out there, which can happen when, for example, an organization has a large allocation and they're not using all of it. This is kind of unfortunate but there's not really a practical way to take small amounts of unused address space and make use of it elsewhere on the Internet.
Comments
Main reason: You need to have reverse DNS that resolves each IP address to the appropriate Star Wars line. You don't have control over the reverse DNS for IP space you don't own (such as 10.0.0.0/8). Without the reverse DNS you'd just see IP addresses in the traceroute output, and no "It.is.a.period.of.civil.war."
Secondary reason: To prevent IP address spoofing, many routers have "reverse path filtering," which drops packets with source IP addresses that shouldn't be coming from the interface they're coming from. This would put a stop to the ICMP TTL exceeded messages and you'd just see stars in the traceroute output.
There is a surprising amount of unused IP address space out there, which can happen when, for example, an organization has a large allocation and they're not using all of it. This is kind of unfortunate but there's not really a practical way to take small amounts of unused address space and make use of it elsewhere on the Internet.