|Document revision:||1.0 (30-jun-2005)|
SpecificationsPackages required: system
License required: Level1
Submenu level: /ip traffic-flow
Hardware usage: Not significant
MikroTik Traffic-Flow is a system that provides statistic information about packets which pass through the router. Besides network monitoring and accounting, system administrators can identify various problems that may occur in the network. With help of Traffic-Flow, it is possible to analyze and optimize the overall network performance. As Traffic-Flow is compatible with Cisco NetFlow, it can be used with various utilities which are designed for Cisco's NetFlow.
Traffic-Flow supports the following NetFlow formats:
- version 1 - the first version of NetFlow data format, do not use it, unless you have to
- version 5 - in addition to version 1, version 5 has the BGP AS and flow sequence number information included
- version 9 - a new format which can be extended with new fields and record types thank's to its template-style design
This section describes the basic configuration of Traffic-Flow.
Property Descriptionenabled (yes | no) - whether to enable traffic-flow service or not interfaces (name) - names of those interfaces which will be used to gather statistics for traffic-flow. To specify more than one interface, separate them with a comma (",") cache-entries (1k | 2k | 4k | 8k | 16k | 32k | 64k | 128k | 256k | 512k; default: 1k) - number of flows which can be in router's memory simultaneously active-flow-timeout (time; default: 30m) - maximum life-time of a flow inactive-flow-timeout (time; default: 15s) - how long to keep the flow active, if it is idle
With Traffic-Flow targets we specify those hosts which will gather the Traffic-Flow information from router.
Property Descriptionaddress (IP address:port) - IP address and port (UDP) of the host which receives Traffic-Flow statistic packets from the router v9-template-refresh (integer; default: 20) - number of packets after which the template is sent to the receiving host (only for NetFlow version 9) v9-template-timeout - after how long to send the template, if it has not been sent version (1 | 5 | 9) - which version format of NetFlow to use
This example shows how to configure Traffic-Flow on a router
Enable Traffic-Flow on the router:
[admin@MikroTik] ip traffic-flow> set enabled=yes [admin@MikroTik] ip traffic-flow> print enabled: yes interfaces: all cache-entries: 1k active-flow-timeout: 30m inactive-flow-timeout: 15s [admin@MikroTik] ip traffic-flow>
Specify IP address and port of the host, which will receive Traffic-Flow packets:
[admin@MikroTik] ip traffic-flow target> add address=192.168.0.2:2055 \ \... version=9 [admin@MikroTik] ip traffic-flow target> print Flags: X - disabled # ADDRESS VERSION 0 192.168.0.2:2055 9 [admin@MikroTik] ip traffic-flow target>
Now the router starts to send packets with Traffic-Flow information.
Some screenshots from NTop program, which has gathered Traffic-Flow information from our router and displays it in nice graphs and statistics. For example, where what kind of traffic has flown:
Top three hosts by upload and download each minute:
Overall network load each minute:
Traffic usage by each protocol: