SO_REUSEADDR for all versions.

prrt/time-protocol.h

@@ -77,9 +77,10 @@ static inline socket_t _open_receiver(struct arguments *args)
     int ssock = socket(AF_INET, SOCK_STREAM, 0);
     assert(ssock >= 0);
 
+    int yes = 1;
+    setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
+
     if(args->optimized) {
-      int yes = 1;
-      setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes));
       setsockopt(ssock, SOL_TCP, TCP_QUICKACK, &yes, sizeof(yes));
 
       int recv_buffer_size = args->rcvbuf;