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-rw-r--r--ripd/ripd.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/ripd/ripd.c b/ripd/ripd.c
index d520af0e..b2c99f05 100644
--- a/ripd/ripd.c
+++ b/ripd/ripd.c
@@ -2710,7 +2710,22 @@ rip_request_send (struct sockaddr_in *to, struct interface *ifp,
int
rip_update_jitter (unsigned long time)
{
- return ((rand () % (time + 1)) - (time / 2));
+#define JITTER_BOUND 4
+ /* We want to get the jitter to +/- 1/JITTER_BOUND the interval.
+ Given that, we cannot let time be less than JITTER_BOUND seconds.
+ The RIPv2 RFC says jitter should be small compared to
+ update_time. We consider 1/JITTER_BOUND to be small.
+ */
+
+ int jitter_input = time;
+ int jitter;
+
+ if (jitter_input < JITTER_BOUND)
+ jitter_input = JITTER_BOUND;
+
+ jitter = (((rand () % ((jitter_input * 2) + 1)) - jitter_input));
+
+ return jitter/JITTER_BOUND;
}
void