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| -rw-r--r-- | docs/system/flowaccounting.rst | 67 |
1 files changed, 62 insertions, 5 deletions
diff --git a/docs/system/flowaccounting.rst b/docs/system/flowaccounting.rst index 1231dcf3..a3ec5248 100644 --- a/docs/system/flowaccounting.rst +++ b/docs/system/flowaccounting.rst @@ -1,12 +1,36 @@ .. _flow-accounting: +NetFlow is a feature that was introduced on Cisco routers around 1996 that +provides the ability to collect IP network traffic as it enters or exits an +interface. By analyzing the data provided by NetFlow, a network administrator +can determine things such as the source and destination of traffic, class of +service, and the causes of congestion. A typical flow monitoring setup (using +NetFlow) consists of three main components: + +- Flow exporter: aggregates packets into flows and exports flow records towards + one or more flow collectors + +- Flow collector: responsible for reception, storage and pre-processing of flow + data received from a flow exporter + +- Analysis application: analyzes received flow data in the context of intrusion + detection or traffic profiling, for example + +For connectionless protocols as like ICMP and UDP, a flow is considered complete +once no more packets for this flow appear after configurable timeout. + +NetFlow is usually enabled on a per-interface basis to limit load on the router +components involved in NetFlow, or to limit the amount of NetFlow records +exported. + +VyOS supports flow accounting through NetFlow (version 5, 9 and 10) or sFlow. Flow Accounting --------------- -VyOS supports flow accounting through NetFlow or sFlow. - -For both types you need to specify the interfaces for which the data will be collected: +In order for flow accounting information to be collected and displayed for an +interface, the interface must be configured for flow accounting. The following +example shows how to configure ``eth0`` and ``bond3`` for flow accounting. .. code-block:: sh @@ -15,7 +39,7 @@ For both types you need to specify the interfaces for which the data will be col NetFlow is a protocol originating from Cisco Systems. It works on level3. -VyOS supports version 1, 5 and 9 +VyOS supports version 5, 9 and 10 (IPFIX - IP Flow Information Export) NetFlow v5 example: @@ -23,4 +47,37 @@ NetFlow v5 example: set system flow-accounting netflow engine-id 100 set system flow-accounting netflow version 5 - set system flow-accounting netflow server 192.168.2.10 port 2055
\ No newline at end of file + set system flow-accounting netflow server 192.168.2.10 port 2055 + +Displaying Flow Accounting Information +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Once flow accounting is configured on an interfaces it provides the ability to +display captured network traffic information for all configured interfaces. + +The following op-mode command shows flow accounting for eth0. + +.. code-block:: sh + + vyos@vyos:~$ show flow-accounting interface eth0 + flow-accounting for [eth0] + Src Addr Dst Addr Sport Dport Proto Packets Bytes Flows + 0.0.0.0 192.0.2.50 811 811 udp 7733 591576 0 + 0.0.0.0 192.0.2.50 811 811 udp 7669 586558 1 + 192.0.2.200 192.0.2.51 56188 22 tcp 586 36504 1 + 192.0.2.99 192.0.2.51 61636 161 udp 46 6313 4 + 192.0.2.99 192.0.2.51 61638 161 udp 42 5364 9 + 192.0.2.99 192.0.2.51 61640 161 udp 42 5111 3 + 192.0.2.200 192.0.2.51 54702 22 tcp 86 4432 1 + 192.0.2.99 192.0.2.51 62509 161 udp 24 3540 1 + 192.0.2.99 192.0.2.51 0 0 icmp 49 2989 8 + 192.0.2.99 192.0.2.51 54667 161 udp 18 2658 1 + 192.0.2.99 192.0.2.51 54996 161 udp 18 2622 1 + 192.0.2.99 192.0.2.51 63708 161 udp 18 2622 1 + 192.0.2.99 192.0.2.51 62111 161 udp 18 2622 1 + 192.0.2.99 192.0.2.51 61646 161 udp 16 1977 4 + 192.0.2.99 192.0.2.51 56038 161 udp 10 1256 1 + 192.0.2.99 192.0.2.51 55570 161 udp 6 1146 1 + 192.0.2.99 192.0.2.51 54599 161 udp 6 1134 1 + 192.0.2.99 192.0.2.51 56304 161 udp 8 1029 1 + |