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NfSen can be a graphical internet based front end to the nfdump netflow tools.
Display your netflow data: Flows, Packets and Bytes using RRD Round Robin Database.
Easily cross the netflow data.
Process the netflow data inside specified period.
Create history and also continuous profiles.
Set alerts, determined by various conditions.
Write your plugins to process netflow data with a regular interval.
Different tasks need different interfaces on your netflow data. NfSen lets you keep every one of the convenient a look at the command line using nfdump directly and give you also a graphical overview over your netflow data.
Stable: 1.3.6 in order to use with nfdump Dec 31, 2011 1.6.5.
This documentation is the term for version 1.3.2
Note: All IP addresses with this document are anonymized. Any coincidence with real IP addresses is as simple as pure chance.
NfSen is designed in PHP and Perl and really should run on any NIX system.
At least Perl 5.6.0 and PHP 4.1 is needed including the Socket and Perl regex extension.
Mail::Header, Mail::Internet
All netflow graphs in NfSen require RRD. At least the RRDs Perl Module is essential.
The nfdump tools include the backend tools for NfSen and can collect and process the netflow data.
Make sure, which you have version 1.5.8 installed. Dont try any version 1.5.5, or profiles will never work.
NfSen incorporates a very flexible directory layout. To simplify initially installation, a default config file is provided, which requires only little changes to operate. The default layout stores everything nevertheless the html pages under BASEDIR. However, you could configure NfSen to suit your local needs. The figure below shows the default layout generally configurable directories.
All netflow details are stored under PROFILEDATADIR. So ensure you have enough disk space with this directory. You can also mount an avid disk volume to PROFILEDATADIR.
If you've installed all prerequisites, exchange signal of the etc directory and copy the NfSen template config file to
Edit according your requirements.
When you're done with, run the script inside the NfSen distribution directory:
Prepares the RRD DBs for that live profile.
After not hard to install, there is an file in CONFDIR. This documentation, is placed in DOCDIR. However. the web page does not have any direct connect to the documentation.
The installer supports upgrading from NfSen version Upgrading from NfSen versions 1.2 is not going to wok. You will first should upgrade these installations to at least one.2.4 and to
Stop old nfsen, as a result of nfprofile stop
Upgrade nfdump to stable 1.5.6. Do not forget to configure nfdump with -enable-nfprofile option.
This will remodel your current NfSen installation. and youre done.
If you could have plugins installed, look at the file for some small changes instructed to be for every single plugin. If you might have PortTracker installed, you should update for the PortTracker version included inside the contrib directory, coming with NfSen. You need not to rebuild your overall db files, just rebuild nftrack and replace the plugin files. See the INSTALL file.
Each channel in NfSen incorporates a collector associated. Therefore additional parameters are required for every single channel. All these settings are stored inside the config file. To add/remove netflow sources edit the file. Make appropriate changes like adding/deleting entries inside the %sources hash. When done, run./nfsen reconfig about the command line. This will create or delete the channels in addition to stop/start the collectors as necessary. Note: If you make some changes on existing channels inside %sources hash, this won't require to reconfig NfSen. Simply stop and begin NfSen.
The nfsen command in BINDIR is usually used to start which will help prevent NfSen. You may develop a soft link out of your appropriate rc.d directory to the present file., or include this command in to the BSD style file.
This starts all nfcapd methods to collect the netflow data along with the nfsend background process to improve your profiles, as new data receives. Point internet browser to Typically.
The background task nfsend along with nfcapd log to syslog. nfsend is incredibly chatty, when configuring syslog priority info or less. You may want to set the syslog priority to warning for normal operation. For debugging purpose, use info or debug.
Most of times you will want to makes use of the web interface. However, you'll be able to almost you must do everything from the command line at the same time. The command line interface is described in many details later on this document.
The navigator bar enables you to select the different views. The default view is Home, if you point your browser to It shows a summary of the currently selected profile. By default, this can be a live profile. The three columns show the Flows, Packets and Bytes history.
If the currently selected profile is really a continuous profile, the page is automatically refreshed every 5 minutes to update the graphs. This means that you can have a browser window in your screen, with always up-to-date graphs. The Graphs tab adds a sub navigator bar, the place you see again the Flows, Packets and Bytes graphs but bigger bigger. When simply clicking one from the graphs either in view, you can be automatically switch for the Details view for even more investigation processing.
Detailed navigation and investigation with the netflow information is done within the Details view. When entering this view, you will note the navigation display.
The page is divided into two parts: The upper part allows you to travel through the netflow data together with selecting just one time slot or time window. The lower part contains the many controls to process the netflow data on the selected time slot or time window.
Clicking on any in the small protocol or type graphs will replace the key graphics using the selected graph. You can switch to and fro and simply select the protocol and/or type to the main graph, which can be appropriate for investigating your situation. The bigger main graph is automatically split in the protocols TCP, UDP, ICMP along with, that is not proto tcp or proto udp or proto icmp, any time you switch the kind of. To flows, packets or bytes.
The available time period of the graph is usually changed while using pull down menu, just below the leading graph:
A time slot starts at intervals of 5 minutes cycle with the hour 0, 5, 10, 15 etc. and lasts 5 minutes. On the other side a period window is made up of several time slots. When entering the Details notice a window scale of merely one days is selected so you'll see the last 24 hours with the profile. The time cursor is placed within the middle in the begin and end of the 24 hours and also the time window slot is placed to one time slot. You will discover the selected time slot or time window always inside the title on the browser window, inside title in the main graph and also above the miniscule print graphs from the upper right section from the main graph. There are several methods to change the present time slot.
The most easiest one is simply by simply clicking in the graph when the time comes slot. This immediately move the cursor towards the selected position.
You can also very easily dragging the handle on the cursor towards the select time slot inside selected period.
Fig. Drag Handle to maneuver time slot
While moving the handle, the present selected time slot is automatically updated in t
within the right hand side in the graph. When releasing the handle, the cursor automatically snaps for the nearest time slot as well as the values inside statistics table are updated accordingly.
Next time slot: Advance time by 5 minutes.
Previous time slot: Go back 5 minutes.
Advance time slot by way of a full span of time of the graph.
Go back by the full time period of the graph.
Go towards the end in the profile. current time slot
Center time cursor in current graph.
Place cursor on the peak, found within/- 60 minutes time-duration of current cursor position.
The graphs are immediately updated, when picking out a different time slot. However, you will discover limits for moving the cursor. The cursor is not moved away from visible part from the graph around the left or right hand side. You also can not move the cursor outside a period slot where data has expired and no information is available for processing. This limit is marked from the dark grey area for the left hand side on the graph.
Fig. Border of obtainable Data
Sometimes it can be desirable to choose and process higher than a single 5 min time slot. From the menu below the leading graph select Time Window
This splits the cursor handle into two halves, which might be dragged individually when necessary. Drag the left and/or right border from the selected window if required.
The statistics summary is automatic updated, when releasing either handle, when moving. To switch returning to a single time slot, select Single Timeslot from your menu.
The statistic summary below the primary graph provides you with an overview about flows, packets and traffic in the selected time slot or time window. Each line corresponds to at least one configured netflow source in profile live or a configured channel in a other profile. For easy visual matching a little colour field while using same colour as inside the the graph prepends each row. If you might be interested in only some with the channels, you could possibly remove the others by clicking the checkboxes. This disables or enables this channel to all graphs and inside the statistics respectively.
The statistic summary could be switched relating to the total sum from the selected time window, or perhaps the rate values per second. The scaling factors for K, M and G are 1000.
Individual columns might be collapsed or expended as required, by clicking within the blue triangles. The entire statistics is usually shown or hidden by clicking for the yellow triangle. When collapsing a column, 1 column remains together with the type, which can be shown inside main graph.
Fig. Expand/Collapse stat
Enabling or disabling channels re-scales the graphs according the rest of the sources, you receive a more detailed graph and an alternative resolution for the y-axis.
To see the details your are serious about, a graph could possibly be displayed with assorted options:
Stacked: All sources are utilized top of the other person.
Line: All sources are drawn independent.
You may switch any time the display option by clicking about the appropriate radio buttons within the lower right corner from the main graph. You may spot more readily peaks in some from the sources by switching for the line graph display option.
Once you've selected time window of curiosity, you may process and filter the netflow data according the needs you have, while using process form from the lower part in the window:
Select the netflow sources to process. You may select multiple sources.
Enter a netflow filter. The syntax conforms towards the nfdump filter syntax.
Select any options with the analysis.
A default filter comes when a specific protocol is selected inside the main graph. You may add further filter expressions when necessary.
By just clicking process, a top-notch 10 statistics on the any IP address ordered by flows is calculated. However, you could change this any time.
The sources, the filter along with all options on the processing form are compiled into your appropriate nfdump command. For convenience a quick description on the filter syntax and options follows. More details are available inside the nfdump1 man page.
The filter syntax is similar towards the well known pcap library utilized by tcpdump. The filter can span several lines. Anything following a is treated being a comment and ignored to your end with the line. There is without any limit in length from the filter expression. All keywords are case independent, unless otherwise noted. For a complete filter syntax understand the nfdump1 man page.
Any filter includes one or higher expressions expr. Any amount of expr is usually linked together:
Filter expr, expr and expr, expr or expr, not expr, expr, not expr expr can be one of several following filter primitives: Any any Used as dummy filter. Use no actual to block all flows. protocol version inet or ipv4 for IPv4 and inet6 or ipv6 for Ipv6 protocol proto protocol where protocol could be any known protocol including TCP, UDP, ICMP, GRE, AH etc. or proto num where num would be the protocol number. IP address SourceDestination IP ipaddr or SourceDestination HOST ipaddr with ipaddr each and every valid IPv4 or IPv6 address. SourceDestination can be omitted. SourceDestination IP IN iplist SourceDestination HOST IN iplist iplist space separated listing of individual ipaddr SourceDestination defines the IP address for being selected and might be SRC DST or any mix of SRC andor DST. Omitting SourceDestination is the same as SRC or DST. inout defines the interface being selected and is usually IN or OUT. network SourceDestination NET for IPv6 network netmask pair SourceDestination NET net/num with net like a valid IPv4 or IPv6 network and num as mask bits. The variety of mask bits must match the correct address family IPv4 or IPv6. Networks could possibly be abbreviated like 172.16/16 if they're unambiguous. Port SourceDestination PORT comp num with num like a valid port number. If comp is omitted, is assumed. SourceDestination PORT IN portlist portlist space separated number of individual port numbers Interface inout IF num with num just as one interface number. Flags flags tcpflags With tcpflags to be a combination of: A ACK. S SYN. F FIN. R Reset. P Push. U Urgent. X All flags on. The ordering in the flags is just not relevant. Flags not mentioned are treated as dont care. In order to get those flows with the SYN flag set, makes use of the syntax flags S rather than flags AFRPU. TOS tos value Type of service: Value 0.255. Packets packets comp num Limit the packet count from the netflow record. Bytes bytes comp num Limit the byte count inside the netflow record. Packets per second: Calculated value. pps comp num scale to specify the pps with the flow. Duration: Calculated value duration comp num to specify the duration in milliseconds on the flow. Bits per second: Calculated value. bps comp num scale to specify the bps from the flow. Bytes per packet: Calculated value. bpp comp num scale to specify the bpp in the flow. AS SourceDestination AS num with num as being a valid AS number. scale scaling factor. Maybe Kilo k, Mega m, giga g, Terra t. Factor is 1024. comp The following comparators are supported:,, , , EQ, LT, GT. If comp is omitted, is assumed. Examples: tcp and src ip 172.16.17.18 or dst ip 172.16.17.19 tcp and net 172.16/16 and src port 1024 and dst port 80 and bytes 2048
An often used filter may be saved and used without notice later while processing flows. To create this type of custom filer, enter in the filter within the text box and click around the diskette symbol in order to save your filter. After successfully saved, the filter is available inside select box. The resulting filter is obviously the filter within the text box along with the named filter, therefore logically linked and. A named filter could be delete or edited anytime by choosing filter and clicking about the appropriate icon either edit, or delete. The named filters are store in a very file under BASEDIR/var/filters which enables it to also be changed there.
When processing netflow data, you can find two general options. Listing flows and setting up a flow statistics. You can switch between two options by clicking within the appropriate button. Depending on what you've selected, the panel automatically adapts to every one available options.
Option to aggregate the flows.
By clicking around the checkboxes, you are able to select how you intend to have your flows aggregated. You also can aggregate entire subnets when choosing srcIPv4/subnet bits
By default the flows usually are not aggregated.
When listing flows from different channels/sources you might sort them according the commencement time with the flows. Otherwise the flows are indexed by sequence with the selected channels.
Select among the available formats to read the flows. The predefined formats line, long and extended are invariably available and correspond the the output formats of nfdump likewise. However, you could specify whenever additional output formats by selecting. Enter your format now inside text input which appears. The format is equivalent to your format specification described within the nfdump1 man page.
By clicking about the diskette symbol, it will save you your new format, which appears now inside the selection menu, pre-made.
For better readability IPv6 addresses are shortened, like that the middle nibbles are cut and replaced by dots Most often the is a great one to recognize a wanted Ipv6 address your are in search of. If you need the total Ipv6 address, look at the option IPv6 long
This choices only available to the flow record statistics and is particularly equivalent towards the aggregate option in List flows. See the description above.
Limit the output just to those statistic lines whose packets or bytes match the limit.
This choices identical towards the Output option in List flows. See the description above.
Depending about the size of your network, netflow processing may consume a lot of your time and resources, once you select a large time window and multiple resources.
All IP addresses inside flow or statistic listing is usually easily researched by clicking around the IP address. The result in the, maintained by Philippe Bourcier, is shown in a very lookup box.
However, you could possibly customize this lookup by creating your lookup. In the LIBEXECDIR copy the module to and customize the Lookup function according to your own personal needs. Do not forget to modify the module name to Lookupsite. Do not customize the original Lookup module, each and every future NfSen update may overwrite your changes.
A profile is usually a specific view about the netflow data. A profile is scheduled by its name, type and a number profile filters, that are any valid filters accepted by nfdump.
At least the profile live is definitely available and is utilized to store your incoming netflow data without filtering. You can switch forward and backward to any profile utilizing the pull down menu from the upper right corner on the web page.
A profile may be either of type History or Continuous. A history profile starts and ends back inside past and remains static. It neither grows nor expires. A continuous profile may start within the past and it is continually updated while new netflow data receives. It grows dynamically and will have its very own expire values set. Old data expires after having a given amount of your energy or each time a certain profile dimension is reached. Additionally a profile might be created like a Shadow profile, meaning no netflow information is collected, and for that reason saves disk space. A shadow profile accesses the information of profile live when human resources is carried out with the proper profile filters applied first.
A profile contains a number of profile channels. A profile channel is scheduled by its channel filter, colour, sign and order the location where the channel is displayed from the graph. A channel is according to one or maybe more netflow sources in the live profile. The variety of channels is independent on the number of netflow sources.
Select the New entry inside the profile pull down menu.
Complete the New Profile form to begin with building the profile. By moving the mouse above the? icon, a help text appears to be guide you throughout the process of creating the profile.
Profiles could be grouped together for easier selection inside profile menu. Select either an active profile group, or develop a new group according for a needs. There is no difference to other profiles besides grouping the profiles inside profile menu.
The profile type Continuous or History is automatically detected according the Start and End values you enter. As profiles are manufactured from netflow data from profile live, the commencement and end in the profile must fall inside the time range with the profile live.
If you allow the Start and End inputs empty, a continual profile is established and starts in the time the profile is made.
If you enter a Start time but no End time, a continuing profile is produced. Data in the past nearly to time, the profile is made is profiled and updated immediately if your profile is produced.
If you enter a Start and End time a history profile is automatically created.
A continuous profile may expire because of the age in the data or profile size suited for disk. Expiring starts whenever among the two limits is reached. Expiring ends in the configured value lowwater in % from the config file By setting any of such values to 0, the limit doesn't apply.
For compatibility with NfSen version 1.2.x a user profile with 1:1 channels could possibly be created, this means, that for each netflow source inside live profile a corresponding channel inside profile will likely be automatically created. The selected sources and also the filter from the profile create dialogue are taken because of this 1:1 profile. This would be the easiest type of a user profile.
For new style profiles select this program. In the modern profile dialogue entries for netflow sources also as for your common filter disappears, as the parameters are actually individual per channel and entered inside the channel dialogue.
Fig. Successful coming of a new profile with individual channels.
After the profile is successfully created, a number of channels is usually added now by clicking about the icon at the proper hand side on the Channel List.
The parameters colour, sign and order are employed to display the channel correctly within the graph. The filter in addition to the netflow sources are essential to correctly profile the channel. The procedure of adding a channel to a different profile is usually repeated as frequently as instructed to complete the profile. When all channels are added the brand new profile have to be committed to activate the revolutionary profile. This is completed by clicking for the checkmark around the right hand side from the Status line.
Once the profile is committed, the build process starts if neccessary. Depending on how long back from the past the profile starts, this could take a considerable amount of your time. You can keep to the build process by looking for the progress bar, showing you the area of completion. This progress bar is updated automatically every 5 seconds. Note: There are no graphs available within the profile provided that the profile will not be completely built.
Fig. Progress to build the profile
Please note: For the live profile, channels have being configured in
Profiles may be modified by picking out the Stat tab with the profile and click on any in the available edit icons on the desired parameter. By clicking about the edit icon of an channel, chances are you'll modify the requested channel. All changes will change the profile immediately. You can also add or delete channels inside a continuous profile. However, please be aware, that adding a whole new channel with an already existing profile will never rebuild any data with this channel for data from the past. Deleting a channel and the entire profile can be done by clicking within the trash icon.
Profile might be converted into another type as desired. However, don't assume all conversions are possible. The figure below shows and explains the possible conversions.
By switching a user profile type between continuous and history you could temporary stop collecting data for a user profile or continuing to get data at a stopped profile. Note, that you loose all netflow data, every time a profile is reconstructed as a shadow profile. When switching back, your data recording resumes on the time of switching.
Alerts let you execute specific actions determined by specific conditions. An alert is defined using a filter applied to your live profile, conditions, triggers and alert actions.
Alerts might be defined and viewed underneath the alert tab, by clicking around the icon.
The alert filter is according to the live profile. Enter the ideal filter here. All following conditions are according to the consequence of this filter.
Conditions are based either about the flow summary or for the top 1 statistic. Conditions can be chained together with the help of additional conditions, while using the icon around the right. All conditions are logically linked or.
The conditions are according to the total variety of flows, packets or bytes passing the resulting filter. The numbers may be compared for an absolute value, or in accordance with various time based average values, that are automatically calculated. This allows to build easy adaptive filters, for detecting peaks.
Conditions could also be according to the top 1 statistic after filtering the flows. These include the well known top N statistics of nfdump.
Fig. Alert conditions top 1
Up in order to six conditions of either conditions type could be linked together.
Whenever the condition evaluates to true, the trigger conditions apply. Depending about the needs a trigger may fire each time the general condition holds true, or once only given that the condition is true and might block triggering for just a certain volume of cycles thereafter.
If a trigger is determined to Once only it has to rearmed manually, in the event the trigger fired. This is finished by clicking within the icon from the top right corner from the alert details page.
Fig. Arm Once Only Trigger
When a trigger fires, a specific actions may be executed. Most often chances are you'll want to send an email for an action. The action also can be disabled whatsoever, to adjust the conditions to optimize a specific alert.
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