tapser.c | 5 +++++

diff --git a/tapser.c b/tapser.c
index 352dc720dd6b7a65c445ad38fb41fcbd28ddd21f254da91715de06922d7a876e..2ae93f595b4ff6970ebf118b0485db90f4759d13ed407de6649d75fc2ce0c101 100644
--- a/tapser.c
+++ b/tapser.c
@@ -94,6 +94,11 @@         if (ioctl(fd, TUNSIFHEAD, &flag) == -1) {
             perror("ioctl(TUNSIFHEAD)");
             goto Err;
         }
+        flag = IFF_BROADCAST | IFF_MULTICAST;
+        if (ioctl(fd, TUNSIFMODE, &flag) == -1) {
+            perror("ioctl(TUNSIFMODE)");
+            goto Err;
+        }
     }
     return fd;
 Err: