Questions tagged [monitoring]

This tag is suitable for questions about or involving network monitoring as implemented on network devices or monitoring tools used by network professionals. Examples: IP SLA, SNMP, Netflow etc.

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58 views

Best practices to build network flow monitoring

Recently I'm investigating the solutions for ip flow monitoring, and come across a lot of pages talking about different solutions and trade-offs between netflow, sflow, IPFIX, etc. In short, netflow/...
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3answers
630 views

How can I monitor traffic matching a IP address?

I see this article: user@host> monitor traffic matching “port 22” no-resolve there can matching a port and I can matching arp too: user@host> monitor traffic matching “arp” no-resolve but, ...
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2answers
150 views

How to monitor vlan using SMNP?

I am a newbie to building a monitor system using Prometheus and SNMP exporter, I have succeeded get metric from the physical interface, but I want to monitor VLAN on a trunk port, is that possible ? ...
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1answer
520 views

mirroring-group not possible on Aruba switch

I am currently in the situation of needing to monitor several ports on a Aruba 2530-24G simultaneously from several other ports. Those are basically HP devices, right? A good solution would be a ...
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1answer
2k views

Does Cisco-IPSLA work with Huawei-NQA?

I want to monitor udp-jitter using IP SLA (Cisco Router). The Destination Router was Huawei Router. I'm not sure whether Huawei Router doesn't support IP SLA responder. Is there anyway to use NQA with ...
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0answers
37 views

uncorrected snmp Qos value from cisco

hello i have a router cisco 1006 and i create a policy-map with to class policy-map CheckBand-BandPerUsr class BandPerUsr police cir 10000000000 class class-default police cir 10000000000 ...
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2answers
250 views

What's the inline monitoring?

What's the inline monitoring? I searched wikipedia and google but do not find the meaning of inline monitoring for network. who can tell me the definition of it? I can get the definition of passive ...
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1answer
69 views

Monitor individual device traffic on Cisco RV042

I am able to monitor Total Traffic consumption on the Cisco RV042 router using SNMP and PRTG. I want to be able to monitor traffic used by each device on my net
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1answer
76 views

Is it possible to differentiate cisco ports on monitoring system via snmp?

I am managing some cisco switches in my monitoring software (zabbix), and it provides useful insights that I would like to monitor: Warning on link up / down Warning when ports are on half duplex ...
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1answer
138 views

ARPs in WIFI Interface Monitor Mode

I set my WIFI interface to monitor mode. I did not expect to see any ARP requests. Can someone explain why there is ARP traffic?
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2answers
2k views

How does nmap distinguish closed ports from filtered ports

Let's suppose we are doing a TCP connect scan. a nmap scan on google returns the following output : PORT STATE SERVICE 80/tcp open http 443/tcp open https However, if I try to ...
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1answer
76 views

why doesn't WireShark show any traffic from invalid certificate https site? [closed]

i have tried mobile apps like HttpCanary and pc programs like wireshark still got nothing from the site !!
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2answers
2k views

SNMP Monitoring Juniper EX8216 switches for Rx/Tx power, temperature and bias current

I am trying to monitor individual transceivers on two EX8216 Juniper switches regarding the following parameters: RxPower TxPower Bias Current Temperature The methodology I am ...
8
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1answer
6k views

Remote sniffing with ERSPAN to the desktop

I know how to use both SPAN and RSPAN. If I'm not wrong, ERSPAN leads us to the possibility of remotely monitoring a router through an IP network and a GRE tunnel. However a tunnel end-point is needed....
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1answer
211 views

Netgear M4300: Is it possible to enable multiple destination ports for mirroring?

I have a Netgear m4300 12x12f. Using the web Console I'm able to use one global port for mirroring traffic from other ports. Is there a way to have different ports mirroring different traffic? I'm ...
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2answers
66 views

Monitoring URL requests on foundation's LAN

We are having a internet cafe with guests walking in and out. We would like to keep an eye on browsing traffic on LAN 192.168.2.0/24, because we don't want guests to visit wrong websites. In such ...
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0answers
264 views

In a reboot/Shutdown event, would SNMP trap be sent before the event occurrence or after that? [closed]

When a device is getting ready to shut down or reboot, Would the SNMP agent send the trap notification to the destination host before the shutdown/reboot event, or after that? What's the general rule ...
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4answers
2k views

Measuring per-link latency/jitter/packet-loss

I need to measure the latency, jitter and packet-loss per link in a network, as opposed to end-to-end, e.g. like this: s1-eth0 <--> s2-eth0 (~ 20µs avg. latency, standard derivation 10µs, 57 % ...
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2answers
450 views

How to calculate traffic in bytes from sFlow datagrams?

I want to approximate network traffic in bytes by writing a sFlow collector that receives sFlow datagrams, parses them, extracts key information only and applies a formula that summarizes the traffic ...
2
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2answers
2k views

Cisco 3560 interface counters, are the counters reset automatically?

I have a Cisco 3560G switch. Are the interface counters reset automatically, recalculated in a specific interval (5 minutes?), or not at all? I want to get (hourly, daily, monthly, etc) interface ...
2
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1answer
90 views

Routing and Switching & network monitoring

hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
2
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1answer
507 views

Nmap doesn't see every reachable host

In my company there are 3 switches: x.x.x.8 x.x.x.9 x.x.x.10 I monitor them on Netsight, sometimes with nmap, and of course pinging. They are visible on Netsight and reachable by ping. I can log ...
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1answer
450 views

CIR and EIR - how to test/calculate?

im wodering how to test CIR EIR between two localization? we have direct link between these locations and I got a question about CIR EIR How can I test/calculate it?
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2answers
46 views

Restricted Youtube access

Is it possible to enforce from Fortigate a restriction on Youtube access? We want to allow Youtube access for some of our employees who work in Media, but we want to enforce some sort of rule or ...
7
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1answer
3k views

How to get ipfix working with openvswitch? [closed]

I'm trying to monitor my OpenVswitch via IPFix. But I'm banging my head against a brick wall for two days now :/ According to the ovs-vsctl manpage I need to add a new entry into the config-database, ...
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1answer
460 views

PRTG - NetFlow v9 on Cisco ASA 5520 not working [closed]

We have a PRTG Probe 192.168.4.4 in our office's Domain Controller, and we are trying to configure NetFlow on our leased Cisco ASA 5520 ver 8.2(5) We have done the following on the Cisco: conf t ...
3
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1answer
311 views

EEM to send email for problematic IP address

After a day of super-slow network performance, I found that one computer was both uploading and downloading gigabytes of data. To find this, I had to pull up a list of the IP addresses by usage ,and ...
1
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1answer
47 views

How can different views onto same data model be defined in YANG?

RFC6020 contains the following statement "A NETCONF server may implement a number of modules, allowing multiple views of the same data" (my emphasis). I want to do exactly that, so that my NETCONF ...
2
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2answers
109 views

Capturing traffic from multiple connections on a switch

Consider the traffic monitoring setup on the bottom of this page: https://www.ntop.org/pf_ring/port-mirror-vs-network-tap/ The two lines of a network tap are connected to a switch which merges the ...
2
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3answers
548 views

Arista switches- Email alert if interface status changes

I'm looking to be notified of interface state changes on my Arista switches without my manual polling of the logs. For example, tailing var/log/messages, I might see something like: un 29 19:10:48 ...
1
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1answer
267 views

What bits does iftop count when calculating and displaying the network bandwidth [closed]

I've googled and read, and googled and read. Everything I've found makes reference to it counting IP packets, but it obviously displays Bits/Byte and packets come all manner of size. What bits does ...
2
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2answers
247 views

Finding the available capacity on switch interface in bytes or bits

Below is the output from my "show interface " command PE1.18:01:44#sh interfaces Ethernet 3 Ethernet3 is up, line protocol is up (connected) Hardware is Ethernet, address is 001c.7374.3d95 ...
4
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1answer
216 views

Can I get what filters are applied to an interface via SNMP?

I have some firewall filters on juniper devices- ex3300s make up the majority of them. I've been looking for an oid that will let me associate an IFL with the filters that are on it, and I've yet to ...
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3answers
209 views

Read out down time of switch port

Is it possible to read out the time a switch port has been in down state on Cisco switches e.g. 2960x. Br Frank
4
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2answers
2k views

Decoding wpa-psk traffic with Wireshark

I want to plot how much data each client is using from a wpa-psk protected access point (that I control). For that I intend to monitor all traffic for a couple of days. However I can't decode the TCP ...
1
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1answer
67 views

whats the best way to check if my API connection is SSL using network monitoring tools? [closed]

I have a Java based system and it is using an API for additional features, the API has a built-in SSL connection on you just have to enable it in the code, and I was able to enable it but I still want ...
1
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1answer
99 views

Sensor to collector communication from SPAN, Inline or TAP

I am trying to figure out which one of the three modes or all would support this. The sensor is a computer running fprobe and pushing UDP traffic (netflow v5) to an IP address in the network. My ...
2
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1answer
1k views

Send command lines to syslog server

I already can send each Linux command line to my syslog server. Now, I'd like to send each command line inserted onto my Cisco router to syslog server. Is it possible? If yes, how?
6
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5answers
3k views

How to check MPLS connections?

I monitor about 150 routers with MPLS links. To check if connection is established, I'm pinging loopbacks visible only from WAN. If a loopback is not responding, I can see which link is not working ...
1
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2answers
142 views

Network fluctuation / delay monitoring between two nodes

Problem background: Our application communicates with multiple other nodes over SCTP. A few times in past issues were reported because of network fluctuation or too much delays that appeared for very ...
1
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4answers
231 views

How to detect router from Windows 7? [closed]

From a Windows 7 box, connected to what should be a private network, what is the best / most foolproof approach to detecting a connected router? The end-goal is to prevent the private network from ...
2
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1answer
674 views

What field tells me the bytes in IPFIX?

In netflow there are in_bytes and in_pkts fields. What are the equivalent values in IPFIX? I'm shipping IPFIX data with softflowd and I'm getting these fields: destinationIPv4Address ...
0
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1answer
237 views

Best practices for IP Flow monitoring [closed]

Current flow probes (using eg. IPFIX, netFlow v5/9, sFlow) are able to monitor flows defined at least by the tuple < source IP, source Port, IP protocol, destination IP, destination Port, source ...
3
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2answers
1k views

Extract QoS Buffer Drops via SNMP

I am in the process of rolling out solarwinds for visibility of QoS performance using netflow and CBQOS to show QoS class usage. One thing I am unsure of is what type of monitoring is available on L2 ...
2
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4answers
129 views

How would you discover hosts on a network if they have stateful firewalls set up?

I've been wondering how it would be possible to accurately map a network using something like nmap and discover hosts on the network if those hosts have stateful firewalls set up that filter packets ...
2
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2answers
3k views

Netflow vs sampled netflow

I'm working on a project where I could need Nexus 5600. These switches support sampled netflow and not netflow. I would like to use netflow to do stats and to analyze trafic at some specific times. ...
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2answers
537 views

Valid use cases for packet deduplication? [closed]

(On-the-fly) packet de-duplication is an advertised feature of some devices in which exact copies of packets can be allegedly filtered out at near line-speed. Ignoring the plausibility of this working ...
1
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1answer
103 views

Is letting routers generate traps on bgp changes a bad idea

In a largish (1M+) IP environment I am responsible for monitoring/alarming and guarding IPAM integrity. Seeing an opportunity to kill two birds with one stone, I asked the guys responsible for the ...
1
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1answer
440 views

SNMP protocol MIBs & OIDs

I am trying to understand SNMP protocol. I have clear understanding how SNMP works on network level. We can send UDP request to device, but on this device snmpd should listen for incoming requests. ...
1
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2answers
239 views

More Information from ICMP & ARP

I installed DEKSI Network Administrator Demo and when it is Creating Map, in Step 3 of 4. Searching and selecting hosts for placing on the map, it found IP address and Mac perfectly, but it also found ...