diff --git a/include/n2n_define.h b/include/n2n_define.h
index 4372372..4d3c48b 100644
--- a/include/n2n_define.h
+++ b/include/n2n_define.h
@@ -46,6 +46,14 @@
 #define IP4_MIN_SIZE  20
 #define UDP_SIZE      8
 
+/* parameters for replay protection */
+#define TIME_STAMP_FRAME	0x0000001000000000LL /* clocks of different computers are allowed +/- 16 seconds to be off */
+#define TIME_STAMP_JITTER	0x0000000027100000LL /* we allow a packet to arrive 160 ms (== 0x27100 us) before another 
+                                                      * set to 0x0000000000000000LL if increasing (or equal) time stamps allowed only */
+
+/* parameter for random number generation */
+#define RND_RETRIES     1000 /* syscall and inquiring random number from hardware generators might fail, so we will retry */
+
 /* N2N compression indicators. */
 /* Compression is disabled by default for outgoing packets if no cli
  * option is given. All edges are built with decompression support so
diff --git a/src/n2n.c b/src/n2n.c
index 8ec3223..7c8109e 100644
--- a/src/n2n.c
+++ b/src/n2n.c
@@ -23,12 +23,6 @@
 #include <assert.h>
 
 
-#define PURGE_REGISTRATION_FREQUENCY   30
-#define REGISTRATION_TIMEOUT           60
-
-#define TIME_STAMP_FRAME	0x0000001000000000LL /* clocks of different computers are allowed +/- 16 seconds to be off */
-#define TIME_STAMP_JITTER	0x0000000027100000LL /* we allow a packet to arrive 160 ms (== 0x27100 us) before another 
-                                                      * set to 0x0000000000000000LL if increasing (or equal) time stamps allowed only */
 static const uint8_t broadcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 static const uint8_t multicast_addr[6] = { 0x01, 0x00, 0x5E, 0x00, 0x00, 0x00 }; /* First 3 bytes are meaningful */
 static const uint8_t ipv6_multicast_addr[6] = { 0x33, 0x33, 0x00, 0x00, 0x00, 0x00 }; /* First 2 bytes are meaningful */
diff --git a/src/random_numbers.c b/src/random_numbers.c
index 111f984..ed734cc 100644
--- a/src/random_numbers.c
+++ b/src/random_numbers.c
@@ -22,9 +22,6 @@
 
 #include "n2n.h"
 
-// syscall and inquiring random number from hardware generators might fail, so we will retry
-#define RND_RETRIES	1000
-
 
 /* The following code offers an alterate pseudo random number generator
    namely XORSHIFT128+ to use instead of C's rand(). Its performance is