# nmap $host
Starting Nmap 6.47 ( http://nmap.org ) at 2015-01-19 20:10 CET
sendto in send_ip_packet_sd: sendto(4, packet, 28, 0, 10.6.25.40, 16) => Invalid argument
Offending packet: ICMP [10.6.20.182 > 10.6.25.40 Echo request (type=8/code=0) id=64730 seq=0] IP [ttl=52 id=37096 iplen=7168 ]
sendto in send_ip_packet_sd: sendto(4, packet, 44, 0, 10.6.25.40, 16) => Invalid argument
Offending packet: TCP 10.6.20.182:56964 > 10.6.25.40:443 S ttl=51 id=39356 iplen=11264  seq=684099691 win=1024 
sendto in send_ip_packet_sd: sendto(4, packet, 40, 0, 10.6.25.40, 16) => Invalid argument
Offending packet: TCP 10.6.20.182:56964 > 10.6.25.40:80 A ttl=54 id=36790 iplen=10240  seq=0 win=1024

It seems the following patch will fix this.

--- libnetutil/netutil.cc.orig  2014-08-16 02:45:47 UTC
+++ libnetutil/netutil.cc
@@ -3605,20 +3605,23 @@ int send_ip_packet_sd(int sd, const stru
      must deal with it here rather than when building the packet,
      because they should be in NBO when I'm sending over raw
      ethernet */
+/* FreeBSD 11 fix (sendto in send_ip_packet_sd: sendto(4, packet, 44, 0, $IP, 16) => Invalid argument)
 #if FREEBSD || BSDI || NETBSD || DEC || MACOSX
   ip->ip_len = ntohs(ip->ip_len);
   ip->ip_off = ntohs(ip->ip_off);
 #endif
-
+*/
   res = Sendto("send_ip_packet_sd", sd, packet, packetlen, 0,
                (struct sockaddr *) &sock,
                (int) sizeof(struct sockaddr_in));
 
   /* Undo the byte order switching. */
+/* FreeBSD 11 fix (sendto in send_ip_packet_sd: sendto(4, packet, 44, 0, $IP, 16) => Invalid argument)
 #if FREEBSD || BSDI || NETBSD || DEC || MACOSX
   ip->ip_len = htons(ip->ip_len);
   ip->ip_off = htons(ip->ip_off);
 #endif
+*/
 
   return res;
 }