diff -ru diald-1.0.orig/proxy_slip.c diald-1.0/proxy_slip.c
--- diald-1.0.orig/proxy_slip.c	2001-06-16 15:51:39.000000000 -0400
+++ diald-1.0/proxy_slip.c	2005-10-04 10:39:41.951883000 -0400
@@ -51,7 +51,11 @@
 proxy_slip_send(proxy_t *proxy,
 	unsigned short wprot, unsigned char *p, size_t len)
 {
-    /* send an initial END character to flush out any data that may
+    /* ignore the wprot param.
+     * As this is a SLIP link then ETH_P_IP is implied and will be prepended at
+     * remote end.
+     *
+     * send an initial END character to flush out any data that may
      * have accumulated in the receiver due to line noise
      */
     putc(END,proxy_mfp);
@@ -91,7 +95,10 @@
      */
     putc(END,proxy_mfp);
 
-    return 0;
+    /* Ensure the packet goes now.
+     * Return EOF if failed, 0 otherwise.
+     */ 
+    return fflush(proxy_mfp);
 }
 
 
@@ -108,6 +115,10 @@
     int c;
     int received = 0;
 
+    /* Insert the protocol at the beginning of the buffer.
+     * If real data is received, the buffer length is adjusted just before
+     * returning
+     */
     *(unsigned short *)p = htons(ETH_P_IP);
     p += sizeof(unsigned short);
     len -= sizeof(unsigned short);
@@ -138,7 +149,7 @@
 		* turn sent to try to detect line noise.
 		*/
 	       if(received)
-		       return received;
+		       return received + sizeof(unsigned short);
 	       else
 		       break;