Questions tagged [network-monitoring]

Describes the use of a system that constantly monitors a computer network for slow or failing components and that notifies the network administrator (via email, SMS or other alarms) in case of outages.

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19 views

Track Bandwidth on shared interface

On our servers running FreeBSD, we've allocated multiple public ip addresses to host different clients on single eth0 interface. The purpose of allocating separate ip to each client is to distinguish ...
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36 views

Bandwidth Calculation using Pcap

Can Pcap be used to accurately calculate the speed or bandwidth of any user using only their IP in both uploading and downloading by checking the src/dst IPs of the packets?? If so, assuming that ...
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1answer
47 views

PHP script to calculate bandwidth per directory on a server?

I am tasked with figuring out the bandwidth used per directory on a parent directory in a linux server. We are hosting 10+ different client sites in 10+ different directories, and want to figure out ...
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2answers
36 views

Remote network monitoring when all comms fail

We had a circuit trip last night (Sunday evening 22:00) which killed all external COMMs ... so the alerting on our servers, inside the building, could not communicate out. Is there a solution to this? ...
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921 views

Is there a way to listen to all traffic on my router, using e.g. Wireshark or tcpdump?

I have a crazy stupid problem driving me to an early grave and I'm trying to trouble shoot what the problem is. Is there a way to listen to all traffic going through my router, including dropped SYN ...
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1answer
29 views

Tips for working with very large pcaps?

What is the best approach for working with very large collections of network traffic (500GB+)? Specifically, I'd like to be able to filter packets which match various payload and protocol criteria (...
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1answer
76 views

Windows Server Login Monitoring Powershell

I've written a basic script for PowerShell to Monitor Event 4771, I have the problem that it still shows RDS-Broker which doesn't tell anything - I want to filter it out and only send the real users ...
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65 views

Why does my router go down every ~16 hours and how can I debug it further?

I have a router that is connected to a larger managed network (such as a university campus network). The router is configured with a static WAN IP address and provides NAT and DHCP to the LAN. After ...
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1answer
154 views

Does AWS GuardDuty monitor traffic through an ELB?

I've been trying to find a definitive answer to this question for a while. I would expect the answer to be "yes" but it does not align with what I see in practice. From the docs GuardDuty "identifies ...
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19 views

Does in-the-field experience suggest that a HTTP POST is more reliable than PUT and DELETE

I need to cross reference my experience with that of professionals, as I'm developing a REST application that can either Use on HTTP POST for all delete and create operations Or use HTTP DELETE and ...
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49 views

Continously monitor network consumption of per process on Linux [closed]

I have a server running Debian Stretch with a lot of running services and from the hoster's monitoring I can see some pretty hefty traffic spikes every now and then (not regular). As this could be ...
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1answer
60 views

Monitor outbound connections

How I can monitor outbound connection that are made from my server along with the program/application which has made the connection request? I have tried using the below command and I am not much ...
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1answer
434 views

how to monitor windows vpn connectivity?

I have set up Windows 10 built-in VPN for the use of one program and I have sense that this connectivity is bad. Generally my Windows machine has very reliable network connection but connectivity in ...
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443 views

On machine reboot via SNMP

Is it possible to reboot a windows or a linux machine via SNMP? Most of information I've found is related to the reload of the SNMP service itself, instead of host reboot.
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85 views

Sending ARP requests with SmokePing

I have been using SmokePing to monitor my local network for some time now and I'm happy with its graphs and email alerts. I use the fping probe and it works as expected. I found however that, every ...
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468 views

Monitor outgoing network usage per HTTP request

In Apache prefork server running PHP application on Linux, each HTTP request might fetch some data from other server, for instance Memcached. Let's say we want to find out top 10 HTTP requests (ex. ...
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1answer
4k views

How to reset the admin password for Observium

How can i reset the password for the user admin with MySQL or a Observium script. MariaDB [observium]> select * from users; +---------+----------+------------------------------------+----------+---...
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1answer
4k views

no active checks on server [xx.xxx.xx.xx:10051]: host [host] not monitored

I am using Zabbix Active Agent to monitor hosts over the network but getting "no active checks on server [xx.xxx.xx.xx:10051]: host [host1] not monitored." errors only in one host with same exact ...
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1answer
4k views

Zabbix disk space monitoring using active agent in linux server

Zabbix server is giving same value for all linux servers upon disk space monitoring using Zabbix Active Agents. I am using Zabbix server 3.2. Please help.
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1answer
1k views

How can I enable WinHTTP trace logging in Server 2012 R2 for viewing raw HTTP commands and application details?

I have an application running on a Windows Server 2012 R2 system and the app leverages winHTTP for various network requests. It's not able to communicate with another server on the network and I ...
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2answers
3k views

“Couldn't resolve host name: Could not resolve host:” in Zabbix

Getting "Couldn't resolve host name: Could not resolve host: example.zabbixagent.com; Name or service not known" in Zabbix server although DNS and hostname of Zabbix Active Agent is correct. Is this a ...
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1answer
726 views

Send notification upon Zabbix active agent shut down

I have configured zabbix server with zabbix active agents but I am not able to get notifications when zabbix active agents shut down. I have no issue getting email notifications when active agents ...
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1answer
674 views

Log and monitor network usage by session/connection

In Resource Monitor, Network tab, in the Network Activity section, I can see each active session and how much bandwidth it is using. I'd like to capture that information over a period of time, is ...
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2answers
973 views

One-way traffic with port mirror HP-2610 to Hyper-V

I have a Hyper-V box that has call recording for IP phones with the following connectivity: PBX on an access port (native vlan 42), plugs to port 22 on switch (it has no settings for VLANs, so we set ...
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1answer
81 views

which monitoring tool is good for monitoring system hardware,software,user management and network activity for all kind of operating system? [closed]

Please kindly suggest me the tool for monitoring the system hardware, software, applications, services, user management and network related activities of IT Infrastructure.
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777 views

Windows Server 2012: easiest way to monitor ports for error 4625 NTLM attacks

I'm getting thousands of hack attacks on a Windows server resulting in Security log error 4625 entries. Hackers are using random IPs, so the usual RDPguard, Syspeace, etc. tools don't work. Port 3389 ...
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914 views

PRTG - Windows IIS Application sensor fault

I have two sensors that are giving me the same alarm. WMI: No result set (code: PE016) -- PerfCounter: No data to return. (Performance Counter error 0x800007D5) I can't for the life of me ...
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1answer
137 views

Nagios Core - Automation

We are using Nagios Core for monitoring devices and we are currently facing some hurdles with monitoring a large scale environment. It requires a lot of manual tasks such as collecting OID's and MIB's,...
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1answer
23 views

Determine network usage of a known process without root/elevation

My application is starting another process, and I'd like to keep track of how much data that new process has read/written from/to network sockets. I've found tools like nethogs, but they require ...
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1answer
859 views

Use iptables chain to monitor traffic

We have a linux box in use as a router, with various rules (ip, tcp port, udp port, etc.) in the iptables FORWARD chain, which might be added to or removed from at any time. I need to monitor ...
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1answer
67 views

How do I set OpenNMS to have two types of Node Down events with different severities?

For example, I have laptops in one subnet which keep turning on and off so if a node on that subnet went down I'd class that as an intermediate incident. However, on another subnet there are critical ...
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1answer
90 views

How to collect I/O Bandwidth statistics on ubuntu 14. [closed]

I want to write script/service to collect I/O bandwidth consumption on daily basis. I know nload tool which will show total I/O data transfer from the time we executed the command. I want script to ...
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1answer
3k views

How can NETSH be used to sniff and collate network traffic?

I am trying to capture all network traffic and view it in a human-readable way. To begin packet capture with netsh, I am running the following command. netsh trace start scenario=NetConnection ...
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51 views

How to securely gather multiple servers data for monitoring

I got an 'admin' server where all admin GUI can be accessed. I also have 2 other servers, 1 web and 1 db. As I expand for a nodejs server/api, I was wondering how could I transfer servers information ...
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164 views

Link-layer scan in Linux

Short version: How can I determine what IP addresses are present on an Ethernet network without assuming they are all on the same subnet? Long version: I've got a device on a network I can SSH into ...
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2answers
197 views

Cisco C3750, detect high traffic

I would like to know what are the interfaces that produce more traffic in my switch. How can I do that?
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1answer
1k views

Proxmox Virtual Machine Bandwidth monitoring

I have been trying to find some tool to allow me to monitor and get stats from virtual machine network usage. I have a proxmox host with several virtual machines, and I would like to have some sort ...
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2answers
1k views

Monitor DNS queries of all hosts in LAN?

We have a simple setup: Some workstations (Mac and Linux) and a gateway router. For statistics and security purposes I want to watch all DNS queries done in our intranet. Unfortunately the gateway ...
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69 views

Rsync cron works but monit cron doesn't

I run a 14.04 Ubuntu server. I'd like to automatically receive Monit email alerts. Typing /usr/bin/monitcron.sh as root all works fine manually. I tried cron with Rsync as a test. Cron works great. ...
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2answers
245 views

bidirectional Bandwidth measurement snmp with remote office

Hello I have a dedicated system for monitoring connected to the network in all remote offices. Our main/nagios server have connection to all. I want to get the bidirectional Bandwidth measurement ...
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41 views

Socket connection opening timstamp

Is there a way to get the timestamp when a tcp connection (tcp) was opened? lsof and netstat are only reporting the process. Sniffers are no solution. My application is a Business Analytics solution ...
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2answers
221 views

Methodology to find a “stable” IP addres within some ISP's AS network

Some definition(s)/meaning(s): Stable IP address - a host within Internet Service Provider (ISP) Autonomous system (AS) network, replaying to ICMP type 8 echo request. Genesis: My routers monitor ...
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1answer
106 views

How can I monitor server varialbes with Microsoft Network Monitor?

I'd like to understand how IIS server populates the HTTP_X_FORWARDED_FOR and the REMOTE_ADDR server variables, how can I "parse" manually the values that IIS is using to determine these variables by ...
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56 views

Ec2 c4.large not responding

I have this ec2 c4.large machine where I'm hosting a video player, for iframe embed purposes in favor of other sites. I'm posting aws stats from aws admin interface: As you can see, the cpu is ...
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1answer
244 views

Security Test and Monitoring for AWS EC2 running SFTP using OpenSSH? [closed]

I have an EC2 Instance that is running SFTP via OpenSSH on Amazon Linux (CentOS). I'd like to run some tests to check for vulnerabilities that I'm not aware of, and I'd like to run monitoring software ...
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1answer
603 views

Figuring out total bandwith usage on a Zyxel Zywall

I've got a Zyxel Zywall USG 100, and I'm trying to figure out the total bandwidth usage. That is, I'd like to find out if some user complaints about speed is related to a saturated connection - or ...
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1answer
396 views

network traffic capture between 2 vms

I am not a pro with networking and am trying to understand the same better. Below is the setup I have. Host system is OSX running VirtualBox. 2 virtualbox VMs (VM1 and VM2), each running Ubuntu ...
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1answer
236 views

How to see + group a list of active tcp connections on a windows server

A client has asked me to take a look at their windows 2008 server because it is running extremely slow. The server is running behind the Windows Firewall (yes, i know) and I believe the application ...
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1answer
29 views

Determine Outgoing data

I have 2 servers running in AWS, both are running Redis and the Data-Dog client. I just looked at our bill and see that we had 800GB of NetworkOut data. I've narrowed down the traffic to these 2 ...
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2answers
162 views

How to analyze bytes transferred over a group of servers?

We have around 50 virtual machines. I installed collectd, graphite and grafana and we have some traffic statistics like these: That produces a graph like this: The lines are incoming and outgoing ...

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