Index: dhcpd.h
===================================================================
--- dhcpd.h	(revision 239564)
+++ dhcpd.h	(working copy)
@@ -209,6 +209,7 @@
 	int			 dead;
 	u_int16_t		 index;
 	int			 linkstat;
+	time_t			 linktime;
 };
 
 struct timeout {
Index: dhclient.c
===================================================================
--- dhclient.c	(revision 239564)
+++ dhclient.c	(working copy)
@@ -285,8 +285,14 @@
 			    ifi->linkstat ? "up" : "down",
 			    linkstat ? "up" : "down");
 			ifi->linkstat = linkstat;
-			if (linkstat)
+
+			/*
+			 * XXX: Hardcoded 5 second grace window on
+			 * link flaps.
+			 */
+			if (linkstat && (cur_time - ifi->linktime) >= 5)
 				state_reboot(ifi);
+			ifi->linktime = cur_time;
 		}
 		break;
 	case RTM_IFANNOUNCE:
@@ -441,6 +447,7 @@
 		fprintf(stderr, " got link\n");
 	}
 	ifi->linkstat = 1;
+	ifi->linktime = cur_time;
 
 	if ((nullfd = open(_PATH_DEVNULL, O_RDWR, 0)) == -1)
 		error("cannot open %s: %m", _PATH_DEVNULL);