diff --git a/TODO-RELEASE b/TODO-RELEASE
index 2ced28753..36d5e0d42 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -1,8 +1,6 @@
 To be addressed in 7.21.5
 =========================
 
-272 - re-using connections bound to local port
-
 275 - Introduce a way to avoid sending USER for FTP connections
 
 278 - "Configure  $as_echo does not work"
diff --git a/lib/url.c b/lib/url.c
index 106d4e7ec..25f03b7e2 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -2606,7 +2606,7 @@ static void conn_free(struct connectdata *conn)
   Curl_safefree(conn->async.hostname);
   Curl_safefree(conn->async.os_specific);
 #endif
-
+  Curl_safefree(conn->localdev);
   Curl_free_ssl_config(&conn->ssl_config);
 
   free(conn); /* free all the connection oriented data */
@@ -2987,6 +2987,25 @@ ConnectionExists(struct SessionHandle *data,
          in use so we skip it */
       continue;
 
+    if(needle->localdev || needle->localport) {
+      /* If we are bound to a specific local end (IP+port), we must not re-use
+         a random other one, although if we didn't ask for a particular one we
+         can reuse one that was bound.
+
+         This comparison is a bit rough and too strict. Since the input
+         parameters can be specified in numerous ways and still end up the
+         same it would take a lot of processing to make it really accurate.
+         Instead, this matching will assume that re-uses of bound connections
+         will most likely also re-use the exact same binding parameters and
+         missing out a few edge cases shouldn't hurt anyone very much.
+      */
+      if((check->localport != needle->localport) ||
+         (check->localportrange != needle->localportrange) ||
+         !check->localdev ||
+         strcmp(check->localdev, needle->localdev))
+        continue;
+    }
+
     if(!needle->bits.httpproxy || needle->handler->flags&PROTOPT_SSL ||
        (needle->bits.httpproxy && check->bits.httpproxy &&
         needle->bits.tunnel_proxy && check->bits.tunnel_proxy &&
@@ -3568,13 +3587,24 @@ static struct connectdata *allocate_conn(struct SessionHandle *data)
   conn->data_prot = PROT_CLEAR;
 #endif
 
+  /* Store the local bind parameters that will be used for this connection */
+  if(data->set.str[STRING_DEVICE]) {
+    conn->localdev = strdup(data->set.str[STRING_DEVICE]);
+    if(!conn->localdev)
+      goto error;
+  }
+  conn->localportrange = data->set.localportrange;
+  conn->localport = data->set.localport;
+
   return conn;
   error:
+
   Curl_llist_destroy(conn->send_pipe, NULL);
   Curl_llist_destroy(conn->recv_pipe, NULL);
   Curl_llist_destroy(conn->pend_pipe, NULL);
   Curl_llist_destroy(conn->done_pipe, NULL);
   Curl_safefree(conn->master_buffer);
+  Curl_safefree(conn->localdev);
   Curl_safefree(conn);
   return NULL;
 }
diff --git a/lib/urldata.h b/lib/urldata.h
index 7588cedc5..d1718a9a4 100644
--- a/lib/urldata.h
+++ b/lib/urldata.h
@@ -936,6 +936,16 @@ struct connectdata {
 
   long verifypeer;
   long verifyhost;
+
+  /* When this connection is created, store the conditions for the local end
+     bind. This is stored before the actual bind and before any connection is
+     made and will serve the purpose of being used for comparison reasons so
+     that subsequent bound-requested connections aren't accidentally re-using
+     wrong connections. */
+  char *localdev;
+  unsigned short localport;
+  int localportrange;
+
 };
 
 /* The end of connectdata. */