benchmark works, but could use some improvement.

~33k packets/sec for a single local pair.

common/random.go

@@ -0,0 +1,12 @@
+package common
+
+import "crypto/rand"
+
+func RandStr(length int) string {
+	b := make([]byte, length)
+	_, err := rand.Read(b)
+	if err != nil {
+		return ""
+	}
+	return string(b)
+}