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+test_ifaddrs
+============
+
+This program prints the addresses and netmasks of all the IPv4 and IPv6
+interfaces on the local machine. It is useful for testing that this
+functionality works on various platforms. If "samehost" and "samenet"
+in pg_hba.conf don't seem to work right, run this program to see what
+is happening.
+
+Usage: test_ifaddrs