path: root/extensions/
diff options
authorJan Engelhardt <>2011-05-02 16:38:11 +0200
committerJan Engelhardt <>2011-05-09 00:18:22 +0200
commit39d3aa36ea38668a2c343b5af42b2d8d3616a9de (patch)
tree4b43df0411d93a1332c2beeed55d60a6e40cd5b5 /extensions/
parentd118d21ea3108f94ca1f84f11dd39f3f12e9ee2b (diff)
libxt_statistic: increase precision on create and dump
Currently, libxt_statistic only dumps the probability with a granularity of 1/1000000. Assuming only stuffed packets with 1440 bytes payload, this would match approximately every 1.341 GB, which is pretty low for a high-volume router. Trying to match any larger interval than that (e.g. 2 GB) will cause libxt_statistic to output "--probability 0.000000", and when restored, will cause it to never match again. Bump the dump precision to what xt_statistic can really do, and adjust the manpage to include a word about it. Furthermore, employ explicit rounding when reading the argument from the command line, because the previous implicit conversion would use truncation, which is not very exact. Signed-off-by: Jan Engelhardt <>
Diffstat (limited to 'extensions/')
1 files changed, 3 insertions, 4 deletions
diff --git a/extensions/ b/extensions/
index 4947dafe..47182bfb 100644
--- a/extensions/
+++ b/extensions/
@@ -12,10 +12,9 @@ and
.B nth.
[\fB!\fP] \fB\-\-probability\fP \fIp\fP
-Set the probability from 0 to 1 for a packet to be randomly
-matched. It works only with the
-.B random
+Set the probability for a packet to be randomly matched. It only works with the
+\fBrandom\fP mode. \fIp\fP must be within 0.0 and 1.0. The supported
+granularity is in 1/2147483648th increments.
[\fB!\fP] \fB\-\-every\fP \fIn\fP
Match one packet every nth packet. It works only with the