The routing requirement spec says that you simply have to have a designated
IP address which is the "router ID" that goes on unnumbered interfaces. Cisco
has some kludge to set it, but it could be a sysctl variable on NetBSD.

   :!mcr!:            |  Network and security consulting/contract programming
   Michael Richardson |         Firewalls, TCP/IP and Unix administration
 Personal: mcr@sandelman.ottawa.on.ca. PGP key available.
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	ON HUMILITY: To err is human, to moo bovine.