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Questions tagged [netflow]

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0answers
14 views

NetFlow v9 on Cisco C3750E Error: % Flow Monitor: 'NetMonitor' could not be added

I'm struggling to configure NetFlow V9 on a Catalyst C3750, but after creating Recorder, Exporter and Monitor parts, I cannot add the Monitor on the interface. Setup: There is a VLAN with the IP 172....
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0answers
20 views

IPFIX Flows from OVS Linux Bridge are not accurate

I’m struggling to understand my IPFIX flow data. To explain: I have an Ubuntu (16.04.2 LTS Xenial Xerus) box, and within that box, I have a single Linux bridge: root@Ubuntu1:~# ovs-vsctl show ...
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0answers
20 views

Encapsulate udp traffic info tcp with on-disk buffering

My ipfix flow receiver supports only udp (can't be replaced), which is not resistant to network failures and then I'm loosing flow data. To improve this I'm thinking about using socat, mkfifo between ...
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0answers
48 views

pmacct dropped packets to netflow collector

im using pmacct to capture packets from libcap and send to netflow collector (nfsen-nfdump) the nfsen shows 10x lower whole traffic than it really is. While debugging the problem - i see lots of ...
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1answer
554 views

Azure change destination IP NAT to local VM

We have an Azure Windows VM created with Inbound security rules allowing UDP/9999 for Netflow traffic. From the Windows VM we can capture traffic destined for the server. The packets are showing the ...
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0answers
315 views

Cisco Netflow exporter inactive

I have difficulty configuring Netflow on Cisco router ASR 1001 flow record FLOW-RECORD-1 match ipv4 source address match ipv4 destination address match ipv4 protocol match ipv4 tos match ...
1
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1answer
447 views

Monitoring DHCP clients bandwidth usage in and out

I have some locations that are running pfSense routers. I attempted to use the softflowd to send data to NFSen thinking that if it came from the LAN interface it might show the bandwidth per IP at ...
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2answers
969 views

Monitoring traffic using Netflow: port mirroring or streaming?

We have a router that we need to monitor using NetFlow. The router is very important, so we are not allowed to enable Netflow on the router itself. Instead, it will have port mirroring enabled so ...
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1answer
267 views

Udp session Netflow

How netflow defines the end of the udp session. That is, as I understand, there must be some timeout in the absence of requests from the dynamic port with the passage of time after which a new session ...
0
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1answer
329 views

How do I generate a source of netflow data for nfcapd?

I am trying to use nfcapd to save netflow files for use by a network analysis tool. How do I capture network traffic on my host and send it into nfcapd? Can I use wireshark/tshark or something ...
1
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1answer
329 views

Logstash netflow plugin configuration error

I'm trying to use logstash to collect traffic information from VMware ESXi using the netflow plugin. I've installed the latest version of logstash and elasticsearch from www.elastic.co on Ubuntu 16....
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1answer
95 views

What is a Netflow?

I am a little confused with the definition of the "NetFlow" sense. Does NetFlow declare, the exchange of the total packets between two IPv4 addresses irrespective the network ports or describe the ...
1
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1answer
271 views

What is correct iptables chain to put -j NETFLOW

I have a router, with firewall (with drop policy), nats, services. I want to account all factual traffic (inputed before firewal, outputed by services, and passed firewall in forwarding), with its "...
1
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1answer
831 views

MikroTik - Traffic flow (Netflow) Octets Counter wrap

I am using Traffic Flow with pmacct (nfacct) to do IP Accounting. I've noticed that if a flow exceeds ~4GBytes in less than a minute (which is my active-flow-timeout) the exported flow Octets counter ...
1
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1answer
162 views

source MAC and destination Mac in netflow( or Sflow)

Is any way to see source MAC and destination MAC in netflow(or Sflow) data, like nfdump -r <FILE_NAME> for netflow data. Any best open source(or free) collector for Sflow?
1
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1answer
686 views

How to configure aws in order to get log events?

My question has two parts: - How to get log events? The command line tells me that I need to configure aws... - How to configure aws? I try to get log events by doing the following: sudo aws logs ...
0
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1answer
426 views

Creating High Availability Netflow Collector

I'm currently working on replacing our existing Netflow collector that is EOL with a new one. The goal is to support around 4 million flows/minute and have HA capabilities. Below is my initial thought:...
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1answer
1k views

Installing Samplicator on CentOS

I'm trying to install Samplicator to test Netflow central collector and then forwarding to other collectors from there. I mainly want to use Samplicator due to it being able to easily sample the ...
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3answers
741 views

How to see traffic traversing a Cisco ASA by inside host?

I have a Cisco ASA 5515 running 9.1 and am interested in learning how I can see bandwidth usage by individual hosts. For instance, using MRTG I can see that my average bandwidth utilization is approx ...
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0answers
165 views

What is the Cisco 7200 VXR Netflow Default Sample Rate?

I am trying to collect netflow data from a Cisco 7200 VXR router. I need to specify the sample rate, but I cannot seem to get the information from the cisco router and I do not know what the default ...
0
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1answer
185 views

CA Network Flow Analysis - sFlow Monitoring Issues

I've been attempting to monitor sFlow traffic from some F5 LTMs, but I'm getting figures like 9 terabytes of data over http, which I don't believe we are getting. Has anyone else had issues like this ...
0
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1answer
465 views

Does CA Network Flow Analysis Monitor SFlow

Does anyone know if CA Network Flow Analysis can monitor SFlow or receive SFlow packets ?
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3answers
395 views

Syslog to IPFIX

I was reading about logs (syslog) being exported in IPFIX format. And some products which do this as well. What I didn't find, was if there is any standard/known ways of doing this ?. Like if there ...
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2answers
722 views

Is ntop's sflow support equivalent to netflow?

I've seen conflicting information from various dates and I'm having trouble determining if ntop supports sflow the same way it supports netflow or if it is somehow handicapped and not really worth ...
0
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1answer
257 views

Memory leak in flow_fanout flow_capture. And strange ip in flow_capture output

On my freebsd box: #uname -rimp 9.1-STABLE amd64 amd64 GENERIC flow_tools: > pkg_info -x flow Information for flow-tools-0.68_7: Comment: Suite of tools and library to work with netflow data ...
2
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1answer
161 views

What is the difference between flow-cat and flow-merge?

I am trying to create some monitoring based on flow-tools: I have flow-capture running to log things into directories. Now I need to merge files together for my analysation interval. I have looked at ...
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3answers
668 views

Netflow/IPfix Analyzer for network threats and anomalies

I'm evaluating various options for Netflow/IPfix based analyzers which focus on identifying security threats and anomalies. It would be highly appreciated if someone can provide a list of tools with ...
1
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1answer
2k views

Netflow to syslog converter

Is there any way to have netflow v9 converted to syslog? Which would be the best way to have the following idea working? Procedure: 1) The router sends UDP with the following structure: templateId=...
4
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0answers
521 views

How to support VRF in Netflow Collector?

I am somehow able to analyze netflow packet using my own netflow collector (build in python). It works for certain ip and CIDR(Classless Inter Domain routing), definitely not overlapping. What is the ...
1
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1answer
1k views

NetFlow Storage Calculator

I am planning to deploy a NetFlow server (using NfSen/NfDump) for harvesting data from Cisco devices; Are there standard calculations or guidelines I can use to calculate my server requirements, ...
1
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1answer
2k views

How come the netflow data isn't showing up on the server?

I have a mikrotik router and it is sending trafficflow (fully compatible with netflow) data to my debian server that is running cacti. But after installing cacti's flowviewer plugin, cacti doesnt ...
2
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1answer
2k views

ntop to analyse bandwidth usage on multiple ASA 5505

I have set up a netflow server at our data centre, which is connected via VPN to ~40 remote offices using Cisco ASA 5505. The aim is to analyse usage data and find out exactly how the remote ...
2
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2answers
2k views

iptables+iptables_netflow: iptables blocking netflow export?

I am running an iptables firewall on OpenSuSE 11.3 --recently I became interested in traffic monitoring and accounting, and to this end installed iptables_netflow module on the firewall and WANGuard ...
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3answers
33k views

How to generate netflow data in linux

We have a number of Linux servers for which I would like to capture netflow data to be processed by a netflow analyzer. I've been spoiled by the ease in which Mikrotik routers allow netflow data ...
2
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2answers
806 views

How useful is the sysUptime value in a Netflow packet?

The value is in theory precise down to the millisecond, but I am skeptical. Does that number tell when the packet was transmitted, or when the connection began or ended? Note: Subsequently I noticed ...
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4answers
2k views

Netflow packet includes zero port numbers?

What does a zero source port number indicate? Can Netflow tell about something a connection that is not TCP or UDP? Thanks.
2
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4answers
835 views

Can someone explain what NETFLOW. and IPFLOW are?

I hear these terms used a lot but haven't found a decent explanation of what they are, how they are used, and what the data looks like (e.g. can you view this data in wireshark?)?
2
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1answer
5k views

NTOP vs NFSEN, which one? [closed]

I want to monitor Cisco's newflows. Which one of these tools do you recommend?
2
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2answers
1k views

Problems with getting both ingress and egress Netflow data

I have a Cisco 6500 switch that I want to capture all vlan8 traffic incoming and outgoing. I talked with my networking group and they set me up with the following commands. (May not be exact commands ...
2
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1answer
2k views

On RouterOS, how will transparent proxying (with DNAT) affect reporting of netflow?

I have a box running Mikrotik RouterOS, which is set up to do transparent web proxying, as described here. In short, this means that I have a firewall rule for destination NAT causing any port 80 ...
2
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2answers
2k views

On Mikrotik RouterOS, is it possible to get Netflow information from a bridged connection?

I have a RouterOS box set up to bridge two ethernet connections. I have use-ip-firewall=yes in the bridge configuration, so that the ports go through the firewall. I've enabled netflow reporting via ...
1
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3answers
758 views

Have NetFlow show true destinations

Currently NetFlow is showing destination (of inbound traffic) as our outside IP rather than inside IP. Also, for all outbound traffic, it is showing the source as our firewall rather than ...
3
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6answers
3k views

Generating and capturing Netflow on a Linux router

We currently have a dual-NIC Ubuntu server at our data centre acting as the gateway router between our public networks and our ISP. We have a /30 cross connect network on the ISP-facing NIC, and one ...
6
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5answers
38k views

Monitoring Bandwidth Usage (Per Internal IP) - Cisco ASA 5505

I manage a small network with a Cisco ASA 5505 and a shared DSL connection. I would like to be able monitor the bandwidth usage of the various users/devices on my network (by IP address). Can I do ...
1
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1answer
729 views

Implementing Argus (similar to netflow) what kind of information should I be gathering?

I am setting up a trial of Argus at my company as a diagnostic tool. We have a collector box attached to a monitoring port on our switch, and the initial plan is to redirect ports with unusual traffic ...
0
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1answer
2k views

How do I configure NetFlow 5/9 export on Juniper switches? [closed]

What are the commands to make a Juniper switch send netflow data (V5 or V9) to a netflow collector for bandwidth monitoring?
4
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3answers
10k views

Can I use Cisco ASA's “NetFlow Security Event Logging” (NetFlow 9) for bandwidth monitoring

Cisco has introduced NetFlow 9 export in the latest software version for ASA firewalls. But it seems to be meant for event logging of security events only (as a replacement for syslog messages). But ...
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6answers
9k views

Solution to route/proxy SNMP Traps (or Netflow, generic UDP, etc) for network monitoring?

I'm implementing a network monitoring solution for a very large network (approximately 5000 network devices). We'd like to have all devices on our network send SNMP traps to a single box (technically ...
4
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4answers
9k views

Netflow Collector for Windows Free

Is there a free netflow collector that I can throw on a windows box?
1
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5answers
706 views

Netflow use cases? [closed]

My company stores netflow mainly for accidents` investigation. What other interesting use cases, tools for insight to your network or applications using netflow you know?