--- gvpe/src/device.h	2011/09/16 18:01:26	1.25
+++ gvpe/src/device.h	2013/07/17 16:40:57	1.26
@@ -42,6 +42,9 @@
 struct net_packet
 {
   u32 len; // actually u16, but padding...
+  // upto 4 bytes at the end might get overwritten when decrypting,
+  // which means len, above, is regularly overwritten with part
+  // of the random prefix when RAND_BYTES=12.
 
   u8 &operator[] (u16 offset) const;
   u8 *at (u16 offset) const;