| Jonas Berlin | f33c461 | 2005-04-01 06:54:23 +0000 | [diff] [blame] | 1 | Match by how many bytes or packets a connection (or one of the two |
| 2 | flows constituting the connection) have tranferred so far, or by |
| 3 | average bytes per packet. |
| 4 | |
| 5 | The counters are 64bit and are thus not expected to overflow ;) |
| 6 | |
| 7 | The primary use is to detect long-lived downloads and mark them to be |
| 8 | scheduled using a lower priority band in traffic control. |
| 9 | |
| 10 | The transfered bytes per connection can also be viewed through |
| 11 | /proc/net/ip_conntrack and accessed via ctnetlink |
| 12 | .TP |
| 13 | [\fB!\fR]\fB --connbytes \fIfrom\fB:\fR[\fIto\fR] |
| 14 | match packets from a connection whose packets/bytes/average packet |
| 15 | size is more than FROM and less than TO bytes/packets. if TO is |
| 16 | omitted only FROM check is done. "!" is used to match packets not |
| 17 | falling in the range. |
| 18 | .TP |
| 19 | \fB--connbytes-dir\fR [\fBoriginal\fR|\fBreply\fR|\fBboth\fR] |
| 20 | which packets to consider |
| 21 | .TP |
| 22 | \fB--connbytes-mode\fR [\fBpackets\fR|\fBbytes\fR|\fBavgpkt\fR] |
| 23 | whether to check the amount of packets, number of bytes transferred or |
| 24 | the average size (in bytes) of all packets received so far. Note that |
| 25 | when "both" is used together with "avgpkt", and data is going (mainly) |
| 26 | only in one direction (for example HTTP), the average packet size will |
| 27 | be about half of the actual data packets. |
| 28 | .TP |
| 29 | Example: |
| 30 | iptables .. -m connbytes --connbytes 10000:100000 --connbytes-dir both --connbytes-mode bytes ... |