Likely MAC fix for Linux.

osdep/LinuxEthernetTap.cpp

@@ -205,14 +205,6 @@ LinuxEthernetTap::LinuxEthernetTap(
 			return;
 		}
 
-		ifr.ifr_ifru.ifru_hwaddr.sa_family = ARPHRD_ETHER;
-		_mac.copyTo(ifr.ifr_ifru.ifru_hwaddr.sa_data,6);
-		if (ioctl(sock,SIOCSIFHWADDR,(void *)&ifr) < 0) {
-			::close(sock);
-			printf("WARNING: ioctl() failed setting up Linux tap device (set MAC)\n");
-			return;
-		}
-
 		ifr.ifr_flags |= IFF_MULTICAST;
 		ifr.ifr_flags |= IFF_UP;
 		if (ioctl(sock,SIOCSIFFLAGS,(void *)&ifr) < 0) {
@@ -225,7 +217,15 @@ LinuxEthernetTap::LinuxEthernetTap(
 		// before they will accept MTU and MAC. For others it doesn't matter, but is
 		// harmless. This was moved to the worker thread though so as not to block the
 		// main ZeroTier loop.
-		usleep(500000);
+		usleep(200000);
+
+		ifr.ifr_ifru.ifru_hwaddr.sa_family = ARPHRD_ETHER;
+		_mac.copyTo(ifr.ifr_ifru.ifru_hwaddr.sa_data,6);
+		if (ioctl(sock,SIOCSIFHWADDR,(void *)&ifr) < 0) {
+			::close(sock);
+			printf("WARNING: ioctl() failed setting up Linux tap device (set MAC)\n");
+			return;
+		}
 
 		ifr.ifr_ifru.ifru_mtu = (int)_mtu;
 		if (ioctl(sock,SIOCSIFMTU,(void *)&ifr) < 0) {