Provides resolution between external and internal addresses. In some cases
network routers are configured to perform address mapping between external
and internal networks and the same mapping must be available to SPIs
in Ignite that perform communication over IP protocols.
Maps internal address to a collection of external addresses.
addr - Internal (local) address.
Collection of addresses that this local address is "known" outside.
Note that if there are more than one external network the local address
can be mapped differently to each and therefore may need to return
multiple external addresses.