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Diffstat (limited to 'extensions/libxt_connbytes.man')
| -rw-r--r-- | extensions/libxt_connbytes.man | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/extensions/libxt_connbytes.man b/extensions/libxt_connbytes.man new file mode 100644 index 00000000..ce7b6659 --- /dev/null +++ b/extensions/libxt_connbytes.man @@ -0,0 +1,30 @@ +Match by how many bytes or packets a connection (or one of the two +flows constituting the connection) have tranferred so far, or by +average bytes per packet. + +The counters are 64bit and are thus not expected to overflow ;) + +The primary use is to detect long-lived downloads and mark them to be +scheduled using a lower priority band in traffic control. + +The transfered bytes per connection can also be viewed through +/proc/net/ip_conntrack and accessed via ctnetlink +.TP +[\fB!\fR]\fB --connbytes \fIfrom\fB:\fR[\fIto\fR] +match packets from a connection whose packets/bytes/average packet +size is more than FROM and less than TO bytes/packets. if TO is +omitted only FROM check is done. "!" is used to match packets not +falling in the range. +.TP +\fB--connbytes-dir\fR [\fBoriginal\fR|\fBreply\fR|\fBboth\fR] +which packets to consider +.TP +\fB--connbytes-mode\fR [\fBpackets\fR|\fBbytes\fR|\fBavgpkt\fR] +whether to check the amount of packets, number of bytes transferred or +the average size (in bytes) of all packets received so far. Note that +when "both" is used together with "avgpkt", and data is going (mainly) +only in one direction (for example HTTP), the average packet size will +be about half of the actual data packets. +.TP +Example: +iptables .. -m connbytes --connbytes 10000:100000 --connbytes-dir both --connbytes-mode bytes ... |