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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697 views

3com Vlan setup

I am setting up a vlan on my 3com switch. The switch is a 4200g 48 port. I have set up 3 vlans i have the generic vlan1 and I have created 2 other vlans 2 and 3. I have manually give them their ip ...
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2answers
165 views

VLAN Testing 3com switch

Hi there I am currently setting up a couple of vlan in work. Hoping that this is going to help with network traffic. The one question that I have is how do I test the vlan when I have finished to ...
2
votes
1answer
194 views

How to Monitor and Log Port Usage and Destination Attempts of a local computer from a Linux Gateway?

I have access to a linux server that is acting as the gateway to an internal network. There is a MagicJack Plus device plugged into this network via CAT5. The MagicJack gets its ip via DHCP from the ...
5
votes
2answers
165 views

Aggregating NICs for receive only connections on Linux

I am setting up a network monitoring system on RedHat 6 that will be receiving the packet feed from an inline tap. One of the functions of this device will be running Snort. Putting two NICs in the ...
13
votes
5answers
5k views

Free open source alternative to pingdom? [closed]

is there an open source alternative to pingdom for simple monitoring of uptime that I can host myself? Should report responsetime and latency for web servers with alert of downtime. I'm looking for ...
0
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1answer
53 views

gather information about packet from malicious ip

I have a glassfish server running some webservice and I noticed that there is an abnormal traffic from japan (150.70.x.x) in my iptables log file and I dont have any user in this country . Until now ...
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1answer
137 views

Analyzing a periodic network spike

One of my servers has a semi-predictable network input spike at 6:45 every day. It comes as early as 6:30 and as late as 6:50, but always lasts for less than 1 minute. I'm trying to figure out how to ...
4
votes
1answer
153 views

Best software for taking a “System Information Snapshot”?

I am curious what people would recommend as the best software for taking a system information snapshot? This would be for use in a technical support fashion.
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5answers
6k views

On Linux, how can I tell which process is sending Ethernet packets?

I'm running gkrellm which shows that some process on my Debian Linux system is writing approx 500KB/s to eth0. I'd like to find out which process it is. I know a little bit about netstat, but it ...
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votes
1answer
104 views

Can network admin see what's goining on inside XP Mode on Windows 7? [closed]

I have Windows 7, and installed XP Mode in order to run certain work programs that won't run in Windows 7. Although both Windows 7 and XP Mode share the same physical connections, they have different ...
4
votes
1answer
2k views

Full status information in Nagios email notification?

I have set up Nagios to monitor my servers and I have written a few custion checks. When I get a notification email, I only get the first line of the status information and I have to use the web ...
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3answers
164 views

Monitoring networks and switches [closed]

I'm new to this area when it comes to monitoring services and hardware devices. Is there anything specific I need to know? 1) Are some hardware devices more compatible then others? Like, will some ...
4
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3answers
5k views

Nagios - Define as service for all the members of a group *except* some hosts?

We're using nagios to check our ssh server is running. We have the check_ssh group defined for all members of a certain group. We have other services defined for that group as well. Everything is ...
2
votes
3answers
3k views

Nagios plug-in check_snmp receives NO SNMP data from a CISCO Router

I have tried setting up Nagios on Ubuntu 10.10, successfully installed and can login to web interface, I am however stuck on configuring snmp or I am doing something wrong here, i have followed ...
1
vote
1answer
492 views

How to filter out “bad-len 0” packets with tcpdump?

When I listen internal network interface of router on freebsd, I get outputs like this 10:36:02.372026 IP 192.168.1.11.8888 > 192.168.1.2.49831: Flags [.], ack 1097, win 65050, length 0 ...
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3answers
4k views

tcp handshake failed.client send rst (after syn-ack). can any one advice?

topology: 2 linux computer connected directly . no iptables rules (except - iptables -A OUTPUT -p tcp -j NFQUEUE ) no firewall. route is defined as - "route add default dev eth0" on the second one ...
2
votes
2answers
2k views

Network monitoring systems in Python

There are a host of open source network monitoring systems available. I tried we used to use Nagios, I have been hearing good things about Munin too. The thing is most networking monitors are written ...
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1answer
443 views

How can I log web service requests between my IIS web application and a 3rd party web service?

My web application (running in local IIS) makes a web service call to a 3rd party service. I'm trying to see the request to verify that it is formatted correctly. I'm trying to do this with Fiddler, ...
0
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2answers
554 views

How do I know if my site-to-site vpn connection is being saturated?

We've got a T1-internet connection with a Cisco ASA 5510 appliance in our small office. We have a site-to-site vpn connection from our office to a remote data center. Question(s): How can I find ...
0
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1answer
163 views

Bandwith/requests monitor on IIS 7/win server 2008r2

Recently i noticed that my VPS bandwith jumped from 20-30 GB per month to 150-400 GB per month in the last few months and i want to know which sites on the server are generating the most bandwith and ...
2
votes
1answer
1k views

Disk Monitoring with OpenNMS

I'm sure this has been asked before (and actually all over the net) but I'm scratching my head a little over this. OpenNMS is installed on my 2008R2 server and is picking up my nodes fine (detecting ...
3
votes
1answer
1k views

How to monitor a UDP multicast stream on a cisco network, hopefully with SNMP

We have a LAN with 2x Cisco 4500's as gateways running HSRP. We're using Exterity HD IP Encoders to take HD video and put it onto the network as a multicast UDP stream (playable in VLC). I have a ...
0
votes
1answer
54 views

I have a Belker router and i am looking for a tool that monitors the ports and reports whitch ports are opend [closed]

I have a Belker router and i am looking for a tool that monitors the ports and reports whitch ports are opend. I need it for testing an aplication. Could you recomend a good offline monitoring tool?. ...
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1answer
283 views

Local network speed appears to be being limited

I have a dedicated server setup that has just started causing us issues. Our immediate problem, is that last week, could log into an admin page of one of our websites just fine, now we can't. It does ...
0
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1answer
207 views

how to detect malicious activity from my server

I'm using a linode virtual server. My machine is Ubuntu 10.04. I got a ticket from Linode that they detected malicous activity coming from my server. "We have detected your system with an IP of, ...
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1answer
514 views

storing nagios configuration data in oneCMDB

I want to store my nagios configuration data into oneCMDB(configuration management database). What i trying to achieve is i will be developing a GUI app in which one can edit the configurations and ...
0
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1answer
372 views

Change source address on discovery of network devices in System Center Operations Manager 2012

My SCOM server has two network cards. One is normal network while the other is connected to the "switch" VLAN. If I try discovering network devices in SCOM I get "No Response Ping", no matter which ...
3
votes
2answers
1k views

Howto prevent snmpd cache results from extend script

On my freebsd box i have snmpd daemon from net-snmp-5.5_4 packet. In snmpd.conf file i have: extend .1.3.6.1.4.1.2021.2 inpt /usr/bin/perl /usr/local/etc/snmp/mpdinput.pl where mpdinput.pl my ...
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2answers
67 views

View internet usage of computers in my network [closed]

What software/application do I need to monitor internet usage of computers in my network to see sites they are browsing?
2
votes
1answer
565 views

Host network injecting resets into my TCP connection?

I'm trying to figure out whether the host network I am on is injecting TCP Resets into my VPN connection. I have a personal OpenVPN server, and recently my attempts to connect over TCP port 1194 have ...
0
votes
1answer
805 views

obtaining nimbuzz server certificate for nmdecrypt expert in NetMon

I'm using Network Monitor 3.4 with the nmdecrypt expert. I'm opening a nimbuzz conversation node in the conversation window and i click Expert-> nmDecrpt -> run Expert that shows up a window where i ...
2
votes
1answer
151 views

Linux NetSec/IDS Bridge

What I am looking to make is a linux system that acts as a bridge. It simple forwards any data sent on one device over to the next device. It does not attempt to block incoming attacks or redirect any ...
2
votes
3answers
2k views

Windows Server 2008 Current Bandwidth Performance Monitor Scaling

I've been looking over Microsoft's performance monitor documentation and the one thing I'm confused about is scaling. Is it purely just for viewing the data more easily? I'm trying to view ...
1
vote
2answers
316 views

Unknown device on network with strange ports open. Trying to find it

Situation: We recently turned off DHCP in favor of fixed IP addresses, and in the middle of the old DHCP range for the legacy network segment, we found a device responding to ping but without any of ...
0
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1answer
88 views

Finding all network addresses associated with a given hostname

Scenario: a server is multi-homed to a variety of networks (perhaps it is a jump box) DNS has the hostname registered only on one network (the management interface, perhaps) Problem: without ...
1
vote
1answer
391 views

How to measure network traffic round trip delays and jitter

I am hoping someone may point me in the direction. I would like generate some network traffic between two endpoints and measure the delay, jitter and packet loss along the path. Could some please ...
1
vote
1answer
471 views

ngrep output when monitoring linux network activity

I'm trying to connect to a remote device (which connect to my server on port 31200 via TCP) and while troubleshooting with ngrep I'm getting the following: T(6) 2012/02/21 00:26:25.817525 ...
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2answers
1k views

IBM x3500 Server managament/monitoring tool

I took over monitoring an older IBM x3500 7977 server and i don't have much knowledge of IBM servers. I'm looking for the equivalent of Dell Server Administrator from IBM, just to monitor and alert on ...
2
votes
1answer
109 views

Network Management Growing messy and ugly need plan [closed]

Hi i currently have a network management that is really manually and there is no user management at all, i've heard that Microsoft Active Directory allows you to have a better network administration ...
0
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1answer
1k views

Monitoring a tcp port using Zenoss

it's possible to monitor a general purpose service, listening on port 5896, i.e.: tcp://production.enterprise.com:5896 I just want know if this service is alive or offline, like a fast "nc -zv ...
1
vote
1answer
376 views

Ganglia network stats incorrect

I am using ubuntu 10.04LTS. The Ganglia on all of my nodes is not reporting the network usage correctly. There is a fairly large amount of fluctuation on the actual network, but on ganglia it seems ...
3
votes
4answers
764 views

What tools should I use to assess bandwidth for web server farm..?

I'm contemplating moving datacentre and I need to know the size of pipe I'll need in order to get a quote. Currently I'm charged on GBs of traffic per month (currently about 42GB inbound - so ...
3
votes
4answers
1k views

Hardware requirements to monitor a larger (3000 device) network

I'm currently evaluating monitoring software for (by my standards) a larger network expected to grow to around 3000 devices. I'm finding data on the hardware requirements for scaling hard to come by. ...
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votes
2answers
79 views

Monitored network at the office [closed]

Network security is not exactly my area of expertese so I apologize if I've phrased this question wrong or if it's already been asked somewhere: If I am on a network that is monitored, like the ...
0
votes
3answers
340 views

Nagios and other network monitoring software [duplicate]

Possible Duplicate: What tool do you use to monitor your servers? I used the Nagios as a network monitoring software to check server's services status about 4-5 years ago. Now i need to ...
1
vote
1answer
155 views

Simple remote administration agent software [closed]

I am looking for a simple remote control, agent based software to perform simple commands to geographically dispersed workstations. I am looking for something similar to Microsoft Intune. I am open ...
0
votes
1answer
128 views

Suggestions for projects related to network monitoring, documentation, collaboration [closed]

I am looking for any projects integrating functions like monitoring, management and documentation of network/servers/services. Currently using Orion and Nagios for tasks on monitoring and alerts, ...
1
vote
0answers
115 views

How to monitor bandwidth on host which uses bridge-util and virtualization

I am running a debian squeeze box with bridge-util and LXC containers. I guess this is a 2 part request. I would like to know what my total bandwidth usage is I would like to see it broken down by ...
1
vote
3answers
536 views

Linux: grep-able monitoring of network traffic and number of connections

I need to collect certain monitoring data every minute and send it to a monitoring server. The source of that data must be parseable using standard Linux tools. For example, to monitor number of ...
4
votes
4answers
10k views

Graphical Ping utility with logging

I need to continuously test the quality of the connection between hosts, and I would like to use ping for that, in order to see WHEN the problem occurs. It should provide LOG of the pinging, with ...