WRAP supports policy-based routing across multiple realms
by allowing the IRT to direct packets
through certain relay agents and to avoid others,
with the directory mapping particular names to these policies.
For instance, a special name in the name lookup can provide a special
IRT to a destination that directs packets
over a more secure ISP network to a particular destination
rather than using a cheaper but less secure route.
The ISP directory service can also provide different IRTs based on
the class of service that the requesting customer is paying for.
WRAP relaying is similar in this sense to source routing and tunneling,
but with the key differences discussed in Section 9.
This routing control can also be used for traffic engineering.