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ethermultilink: send gratious arp instead of flushing arp cache

--- a/rc/bin/ethermultilink

+++ b/rc/bin/ethermultilink

@@ -50,9 +50,11 @@

 			echo bind bypass primary 0 $primary

 			echo bind ether secondary 0 $new

 		}

-		# make switches aware of the new path

-		echo flush > $net/arp

+		# do gratious arp on the new path

+		for(ip in `{awk '$3=="4u" || $3=="6u" {print $1}' $net/ipselftab}){

+			echo garp $ip > $net/arp || echo flush > $net/arp

+		}

 		old=$new

 	}

 	sleep 1