D17171.diff
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	Index: head/sbin/ifconfig/ifconfig.c
	===================================================================
	--- head/sbin/ifconfig/ifconfig.c
	+++ head/sbin/ifconfig/ifconfig.c
	@@ -504,6 +504,18 @@
	}
	#endif
	errx(1, "interface %s does not exist", ifname);
	+ } else {
	+ /*
	+ * Do not allow use `create` command as hostname if
	+ * address family is not specified.
	+ */
	+ if (argc > 0 && (strcmp(argv[0], "create") == 0 \|\|
	+ strcmp(argv[0], "plumb") == 0)) {
	+ if (argc == 1)
	+ errx(1, "interface %s already exist",
	+ ifname);
	+ argc--, argv++;
	+ }
	}
	}