diff --git a/idle_scan.cc b/idle_scan.cc
index 2d6a1f06a..408efb356 100644
--- a/idle_scan.cc
+++ b/idle_scan.cc
@@ -391,6 +391,9 @@ static void initialize_idleproxy(struct idle_proxy_info *proxy, char *proxyName,
     proxy->rawsd = -1;
     proxy->ethptr = &proxy->eth;
   } else {
+#ifdef WIN32
+    win32_warn_raw_sockets(proxy->host.deviceName());
+#endif
     if ((proxy->rawsd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0 )
       pfatal("socket troubles in %s", __func__);
     unblock_socket(proxy->rawsd);
diff --git a/osscan2.cc b/osscan2.cc
index 757a2c127..0054d74d1 100644
--- a/osscan2.cc
+++ b/osscan2.cc
@@ -931,6 +931,9 @@ HostOsScan::HostOsScan(Target *t) {
     ethptr = &eth;
   } else {
     /* Init our raw socket */
+#ifdef WIN32
+    win32_warn_raw_sockets(t->deviceName());
+#endif
     if ((rawsd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0 )
       pfatal("socket troubles in %s", __func__);
     unblock_socket(rawsd);
diff --git a/output.cc b/output.cc
index 708302b48..a0ad21a8f 100644
--- a/output.cc
+++ b/output.cc
@@ -116,6 +116,7 @@
 
 #include <math.h>
 
+#include <set>
 #include <string>
 #include <vector>
 #include <list>
@@ -296,6 +297,17 @@ static char * getServiceXMLBuf(struct serviceDeductions *sd) {
 }
 
 #ifdef WIN32
+/* Display a warning that a device is not Ethernet and so raw sockets
+   will be used. The warning is shown only once per unique device name. */
+void win32_warn_raw_sockets(const char *devname) {
+  static set<string> shown_names;
+
+  if (shown_names.find(devname) == shown_names.end()) {
+    error("WARNING: Using raw sockets because %s is not an ethernet device. This probably won't work on Windows.\n", devname);
+    shown_names.insert(devname);
+  }
+}
+
 /* From tcpip.cc. */
 bool DnetName2PcapName(const char *dnetdev, char *pcapdev, int pcapdevlen);
 
diff --git a/output.h b/output.h
index 2452e0004..8a8da568b 100644
--- a/output.h
+++ b/output.h
@@ -125,6 +125,12 @@
 #include "nmap.h"
 #include "global_structures.h"
 
+#ifdef WIN32
+/* Display a warning that a device is not Ethernet and so raw sockets
+   will be used. The warning is shown only once per unique device name. */
+void win32_warn_raw_sockets(const char *devname);
+#endif
+
 /* Prints the familiar Nmap tabular output showing the "interesting"
    ports found on the machine.  It also handles the Machine/Greppable
    output and the XML output.  It is pretty ugly -- in particular I
diff --git a/scan_engine.cc b/scan_engine.cc
index 97095b0ff..dfd01a019 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -1526,6 +1526,9 @@ void UltraScanInfo::Init(vector<Target *> &Targets, struct scan_lists *pts, styp
       rawsd = -1;
     } else {
       /* Initialize a raw socket */
+#ifdef WIN32
+      win32_warn_raw_sockets(Targets[0]->deviceName());
+#endif
       if ((rawsd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0 )
 	pfatal("socket troubles in %s", __func__);
       /* We do not wan't to unblock the socket since we want to wait 
diff --git a/traceroute.cc b/traceroute.cc
index 79b83ba13..a08c09391 100644
--- a/traceroute.cc
+++ b/traceroute.cc
@@ -216,6 +216,9 @@ Traceroute::Traceroute (const char *device_name, devtype type, const scan_lists
         if (ethsd == NULL)
             fatal ("dnet: Failed to open device %s", device_name);
     } else {
+#ifdef WIN32
+        win32_warn_raw_sockets(device_name);
+#endif
         if ((fd = socket (AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
             pfatal ("Traceroute: socket troubles");
         broadcast_socket (fd);