1

src/tun_freebsd.c

@@ -117,8 +117,9 @@ static int tun_set_ip(const char *ifname, const char *ip_addr) {
     addr->sin_addr = ip;
     if (if_ioctl(ifname, SIOCSIFADDR, &ifr) < 0) return -1;
 
-    // Set netmask
-    addr = (struct sockaddr_in *)&ifr.ifr_netmask;
+    // Set netmask (FreeBSD uses ifr_addr for netmask too)
+    memset(&ifr, 0, sizeof(ifr));
+    addr = (struct sockaddr_in *)&ifr.ifr_addr;
     addr->sin_family = AF_INET;
     addr->sin_addr = netmask;
     if (if_ioctl(ifname, SIOCSIFNETMASK, &ifr) < 0) return -1;