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.

learn more… | top users | synonyms

-4
votes
1answer
67 views

Is there a way to display my router's bandwidth usage graph on a web page? [closed]

My router has bandwidth graphs that update once per second. I am building a status screen (as a web page) to be displayed on a TV in our tech department, and I'd like to embed the graph so we can ...
-2
votes
1answer
455 views

Layer 2 and 3 Network and Topology discovery of blackbox network [closed]

I have been given a company network to perform layer 2 and layer 3 network discovery. I have to find out the network topology and infomation about network equipments including switch, router, server, ...
7
votes
5answers
3k views

Nagios server best practices?

I run a medium-sized Nagios server. It monitors roughly 40 servers with 180 services currently and is only growing by the day. I migrated from an old Nagios setup that was configured in a very ...
-6
votes
1answer
332 views

How to monitor all network traffic [closed]

I have installled wireshark on my server but can only monitor traffic through the local nic but all network traffic does not go through the server. I would like to monitor all network traffic. Are ...
2
votes
1answer
1k views

Detailed statistics using Ubiquiti UniFi hardware

I'm using UniFi manager to manage 10+ sites with 3-5 hotspots per site, and I look for more detailed statistics that the one offered by UniFi manager, such as: following an user through different ...
0
votes
1answer
986 views

Nagios mysql check service definition configuration?

I'm using the Consol Labs MySQL Health Check plugin to monitor my MySQL database. I'd like to change the warning and critical thresholds for the threads connected parameter, but have forgotten how. ...
2
votes
1answer
482 views

Monitoring IPv4 vs IPv6 Traffic

We have a fully functional dual-stack network running in our business. Has anyone found a simple tool for monitoring IPv4 vs IPv6 traffic ratios on a given host? When I say "simple" I'm thinking a ...
0
votes
0answers
227 views

Zabbix aggregate checks shows wrong statistics

Please, help with a Zabbix problem. I configured aggregate check, which should calculate the group load on outgoing eth0 for the whole group "Linux Servers" I have in Zabbix. Here is a screenshot of ...
0
votes
0answers
293 views

Tcpdump stops capturing wifi data while running in the background

I have a problem capturing wifi data using tcpdump while running in the background. OK, lets get some facts: my wifi-device is named wlan0 wlan0 is in monitor mode (that's what I want) I'm using ...
0
votes
3answers
218 views

Monitor HTTP usage on network from Linux free [closed]

I manage a small office network. I am looking to start monitoring/logging internet usage (website requests) for each user on a small network. All the windows clients are running through a switch to a ...
0
votes
1answer
94 views

Only one server behind a switch cannot access the internet and vice versa

I have multiple servers deployed behind a single switch. All the servers have their own public IP addresses. Suddenly one of them (say A) cannot be accessed from the outside by any means, e.g. HTTP, ...
-2
votes
2answers
139 views

Collecting Web traffic and monitoring reports [closed]

My company is a med home health company and I have been tasked with seeing what people are doing on the internet. There's been a lot of people complaining of people shopping, surfing internet, etc on ...
0
votes
3answers
2k views

Script to log internet connectivity outage [closed]

What is the best approach to setting up a script to monitor and report a server's connection to the Internet? I'm not referring to connection to the local network, but rather a server's (or the whole ...
-3
votes
1answer
29 views

Grabbing sniffed packet data

So I have a Fiddler2 capture. In the capture, there was a file that was downloaded, file.dat. I am trying to extract the downloaded file from the capture. I can't seem to find any way to do that. Any ...
0
votes
1answer
167 views

Resource requirements for cloud OpenVPN server [duplicate]

I am building a proxy server for a client of mine. My platform of choice is Amazon EC2 with Arch Linux and Squid running. For the encryption part I have chosen OpenVPN for simplicity and large ...
0
votes
1answer
261 views

network gateway can't see traffic for monitoring

I've just setup a new CentOS 6.4 machine to act as a default gateway for the LAN at head office. It's primary task is simply to route traffic to the appropriate place, ie VPN servers or the firewall ...
1
vote
3answers
252 views

How can I find which program is making a specific network request?

I have 2 Windows Server 2003 boxes that sit idle, for the most part, on weekends. Yet when I look at my router's DNS logs, both machine's are making many requests for www.yahoo.com when there's nobody ...
0
votes
1answer
426 views

add a cgroup controller into libvirt

libvirt by default has cgroup controllers of ["cpu", "devices", "memory", "blkio", "cpuacct"] as shown in qemu.conf. I want to add one more controller of net_cls. I tried to modify the config file to ...
0
votes
1answer
62 views

Masquerading a Webserver [closed]

I was trying to gain access to a piece of obsolete network hardware by intercepting into the configuration information that it is downloading from a remote server(with a public IP - This server exists ...
2
votes
1answer
193 views

Network monitor 3.4 issue

I am getting the following error message when I try to run network monitor on a windows 2003 DNS server I am trying to decommission. C:\>Nmcap.exe /network * /capture KerberosV5 || TCP.port==389 ...
0
votes
1answer
60 views

Developing an SNMP agent for linux

I'm developing a snmp agent for linux and I wonder if there is a directory or file proper protocol statistics snmp OIDs to develop snmpInPkts, snmpOutPkts, snmpInBadVersions, snmpInBadCommunityNames. ...
1
vote
1answer
755 views

Collectd Network plugins didn't open listening port

I tried to send the monitoring data to my centralized collectd and found this error in the log [2013-08-09 07:04:22] bind: Cannot assign requested address [2013-08-09 07:04:22] network plugin: ...
1
vote
2answers
190 views

Testing DNS “health” — whether domains are pointing to the correct IPs

I'm planning on switching from one registrar to another. Fortunately I've been able to pre-enter the zone information so that when the transfer takes place, everything should behave the same. ...
0
votes
1answer
509 views

Cisco Prime NCS not starting

I have received the Cisco Prime OVA file and which we placed onto an Oracle virtual environment. We turn the VM on and the CLI boots, When we try to start the NCS service we get errors. ...
0
votes
1answer
105 views

tshark duration of a conversation for a ip address

i can retrieve the follow info from a .pcap : ================================================================================ IPv4 Conversations Filter:ip.addr==1xx.1xx.0.1xx ...
2
votes
1answer
48 views

How can I monitor embedded, networked gear that doesn't have SNMP or any other standard protocols?

I need to monitor (and control if possible) hundreds of pieces of Audio Video gear. Every make/model uses a different protocol, usually simple ASCII strings like "status?\r" with a reply like "OK\r". ...
0
votes
4answers
3k views

Ping only OS Detection with nmap?

I am interested in using nmap for discovery, and to figure out the OS of each host. I understand that nmap does this, and can be enabled and controlled as described in the man page: OS detection ...
1
vote
1answer
599 views

Icinga Monitor Website for String

I am trying to use Icinga to monitor a website for a particular string. When I run the plugin from the command line, it seems to work fine, but in Icinga-Web, it always shows up as successful no ...
0
votes
2answers
832 views

Is My Website Under DDOS Attack? [closed]

Recently I noticed that the CPU load of my server is increasing rapidly. In any day, the CPU load does not reach 2.5. I have the following server: Intel® Xeon® E3-1270 v2 Single Processor - Quad Core ...
0
votes
1answer
257 views

monitor vps bandwidth usage

I have a vps guest whose ip is 192.168.1.20. I add the following lines to iptables, # iptables -A FORWARD -o eth0 -s 192.168.1.20 # iptables -A FORWARD -i eth0 -d 192.168.1.20 Then I run this line ...
0
votes
3answers
501 views

Getting alerts from remote Icinga/Nagios instance

I have an Icinga server (which is basically a fork of Nagios) at one of my clients' sites. I access the server via ssh and don't have access to other ports. Since there are a couple of things that ...
3
votes
1answer
991 views

Enabling TCP md5 signature option in centOS?

I'm trying to enable md5 checksum/signature for tcp packets in centOS (the main use case to stop tcp RST attacks, etc). It seems like I may be able to do this for individual ports using netcat or via ...
1
vote
2answers
2k views

Wireshark does not capture HTTP on 8080

I am running Wireshark on my linux machine and i have simple python web server running on localhost:8080 I am capturing only local port 8080. When i open browser on localhost:8080 wireshark captures ...
2
votes
2answers
174 views

Log incoming and outgoing connections on my Leased Line

I am a System Administrator at a college where we have a leased line internet connectivity and 32 Static IPs. The Local; network is running behind the Juniper Firewall. Now I would like to log all the ...
0
votes
1answer
123 views

Hyper-V Client Network Dropouts

Bit of a strange one I'm having that I can't work out. The setup: Asus P8Z77-M Pro motherboard, 16GB RAM, Intel i7-3770 CPU, OCZ SSD, NVIDIA Quadro 2000 grpahics card (with RemoteFX on the client); ...
0
votes
2answers
854 views

monitor traffic using port mirroring and wireshark

We have an edge router connecting the Internet and our internal network. I needed to monitor the traffic going in and out, and make a report about which server/host uses most of our bandwidth and ...
1
vote
0answers
331 views

Multiple connections using multiple IP addresses to same PC

Background: I have a network management application (like Nagios or OpenNMS but not either one) under testing that requires all managed devices to have individual IP addresses ie. SNMP traps received ...
0
votes
2answers
1k views

monitor bandwidth usage per application or IP

i want to monitor the bandwidth usage per application or per IP, currently im using wireshark to do the work, but are there any software dedicated just for this type of job? thanks
2
votes
0answers
125 views

How can I set ntop not to shorten host names?

With most screens in ntop, there is a list of hosts. Unfortunately, in almost every one, the host name is shorted, for some reason. When the host names follow the company standard, this results in the ...
0
votes
1answer
235 views

Programmatically interfacing with Managed switches (Cisco 3750)?

I work at an organisation that has a few thousand computers and around 100 switches. To help with the stock take for the computers I would like to programmatically access the managed switches to find ...
0
votes
2answers
252 views

log server setup and testing, with log manager opensource

I've been trying to get a new, centralized, log-server up and running for some testing and have run into some problems. First part is that I've installed Kibana but can't get anything indexed, tried ...
0
votes
2answers
252 views

How can I scan using nmap and Zenmap all hostnames that begin with a particular string?

I have a number of nodes on a couple of networks whose hostnames all start with org. Some examples are: orgwebsvr1 orgwebsvr2 orgwebsvr3 orgdbsvrmysql orgdbsvrmssql orgdbsvrosql With nmap, I know ...
0
votes
1answer
154 views

Tool to automatic suspending the DDOSed website before the whole VPS is being suspended by Data center [duplicate]

I have a non-Xen VPS (don't exactly know what the software is). The past week, we had experienced several DDOS attacks on one (or some) of the hosts and because of using more than usual bandwidth, ...
1
vote
3answers
413 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
vote
1answer
88 views

Automatic Node Categorization not working in OpenNMS

I setup a Node Categorization policy in the foreign source definition ; its not working correctly what changes need to be done? Text version: (for bot/crawler) name SetNodeRouter class ...
2
votes
2answers
227 views

What to use to get meaningful network statistics

A customer has a rack with some 1U servers and Dell™ PowerConnect™ 2716 switch at ISP's server room. One port is uplink to the ISP. Some servers run ESX5 while one 1U server is a plain Windows 2008 R2 ...
-1
votes
1answer
76 views

How can I get the total “INTERNET” usage (in MB) using Microsoft Netmonitor or any other tool

I tried with Microsoft Netmonitor, but I don't know which column has to be added to get the Total usage (in MB). I also want to know about what filter have to be applied to get only the INTERNET ...
3
votes
2answers
1k views

Monitor Internet bandwidth by IP in a LAN environment?

I am new to networking so pardon if this is a stupid question. I want to see how my users use the internet bandwidth. I have around 50 Users in the network and I am using a checkpoint edge series ...
0
votes
2answers
85 views

Alert when a file/directory upload has failed

I am using Ubuntu and needed to know if there is any way to produce an alert when a File copy/upload operation has failed. The scenario is as such: I have file xxxxx on my computer/server. However, ...
0
votes
1answer
53 views

Tracking data sent to remote host over time?

What is a a good way to track over time the amount of data transferred from my Linux server to another host on the internet? https and imaps only