this?

llarp/ev_kqueue.hpp

@@ -264,8 +264,12 @@ namespace llarp
     int
     read(byte_t* buf, size_t sz) override
     {
-      // all BSDs have packet info
+// all BSDs have packet info
+#ifdef __FreeBSD__
+      const ssize_t offset = 0;
+#else
       const ssize_t offset = 4;
+#endif
       // becuase reasons :^)
       if(sz < offset)
         sz = 1500;

vendor/libtuntap-master/tuntap-unix-freebsd.c

@@ -139,13 +139,6 @@ tuntap_sys_start(struct device *dev, int mode, int tun)
     return -1;
   }
 
-  int set = 1;
-  if(ioctl(dev->tun_fd, TUNSIFHEAD, &set) == -1)
-  {
-    tuntap_log(TUNTAP_LOG_ERR, "ioctl for TUNSIFHEAD failed");
-    return -1;
-  }
-
   /* Save flags for tuntap_{up, down} */
   dev->flags = ifr.ifr_flags;