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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1answer
334 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
266 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, ...
0
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1answer
607 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
440 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 ...
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2answers
72 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
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1answer
692 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 ...
3
votes
2answers
7k views

frequent “SNMP error” with Cacti

When adding new devices to my Cacti instance, I get frequent "SNMP error" messages in the device screen. But the error is not consistent, not even for the same device. Here's what I already have ...
0
votes
1answer
853 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 ...
4
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2answers
2k 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 ...
2
votes
1answer
170 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
3k 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 ...
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2answers
378 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
89 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
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1answer
519 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
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1answer
587 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

Intel igb driver packet loss on Debian Linux 6.0

I am running Debian Linux 6.0 (2.6.32-5-amd64). My network NICS are Intel 82580 Gigabit running with the IGB network driver version 3.3.6 (firmware version 3.2-9). I tested the performance and I ...
1
vote
1answer
453 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
879 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 ...
6
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4answers
2k views

Open source DCIM stack?

Our 500-server data center is growing quickly and my manager has started investigating using a specialized Data Center Infrastructure Management (DCIM) package to help manage constraints. DCIM ...
0
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2answers
747 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 ...
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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 ...
3
votes
4answers
2k 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. ...
1
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0answers
122 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 ...
4
votes
4answers
14k 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 ...
0
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2answers
1k views

Why so many ARP requests on the network with Windows 7 (using Network Monitor)?

I've read that it's fairly normal to have several ARP requests per second on the network, but was curious if someone could elaborate on the "why" I would have so many versus not? Over the course of 4 ...
0
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2answers
758 views

fedora default traffic monitor tool

On a fedora server i have access using a ssh connection. As a regular user, how can I see what traffic is involved into the server? I don't have root rights, and I'll like to learn from the default ...
12
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4answers
1k views

How do I deal with the removal/eradication of an unknown worm on our network?

TL;DR I'm pretty sure our small network has been infected by some sort of worm/virus. It seems to only be afflicting our Windows XP machines, however. Windows 7 machines and Linux (well, yea) ...
0
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1answer
507 views

Is there a pingdom-like service that has hosts in Asia and South America [closed]

I am looking for a remote monitoring service, similar to pingdom, that has more global reach. Right now pingdom only has coverage for North America and Europe. Does anyone know of a competing service ...
1
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3answers
640 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 ...
11
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3answers
4k views

Check incoming network traffic in real time?

Is there a way I can monitor incoming network traffic in real time on my server? Preferably in terms of *bps Running Ubuntu
2
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1answer
1k views

Easiest way to install Packetfence or similar onto my network

We have a simple small business windows network with very basic internal security. We are a small college and want to provide access to the internet to your student body, but not to the internal ...
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1answer
1k views

Alternative to Ntop on FreeBSD

ntop is a great tool for recording network throughput statistics for FreeBSD based firewalls. The statistics can be displayed as graphs using a web browser. Ntop, however, has the limitation that it ...
0
votes
1answer
905 views

Tools to monitor bandwith (outgoing) on my ArchARM NAS/Server?

I have been having some problems with my router last few days, and in the process of narrowing down the problem, I found that while I wasn't using my home network explicitly I was having upto 1GB of ...
0
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1answer
1k views

ICMP Data Field Modified - What does it Mean?

Normal ICMP Data fields are composed of a pretty standard 32 byte string of alphabet characters. abcdefghijklmnopqrstuvwabcdefghi I have captured a series of ICMP echo requests using WireShark with ...
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 ...
0
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3answers
451 views

Strange network traffic on my dedicated server. How to find out what is causing it

I noticed a trange outgoing traffic in my dedicated server. I'd like to know how could I find out what is the reason to this. One day traffic One week traffic As you can see, there are bursts of ...
0
votes
3answers
351 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 ...
3
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2answers
351 views

Real benefits of tcp TIME-WAIT and implications in production environment

SOME THEORY I've been doing some reading on tcp TIME-WAIT (here and there) and what I read is that it's a value set to 2 x MSL (maximum segment life) which keeps a connection in the "connection ...
5
votes
2answers
1k views

detect weak encryption and outdated protocols

I'm looking for software that helps detecting applications that use weak encryption or outdated protocols in a central place. Sorry if that sounds vague. Maybe an example will help. Let's take a ...
7
votes
5answers
1k views

Software to diagnose (ping) a network over 24h?

We've been experiencing a lot of problems with our current office's internet connection lately: slowdowns, packet losses, huge ping times, etc. (Un)fortunately, this is not happening all the day, ...
0
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2answers
2k views

How to diagnose severe network problems in small network?

We have fairly small network with managed and unmanaged switches (Netgear GS748T, Linksys SLM2024, DGS-1008D, DES-1008D, DES-1026G, SRW224G4), about 8-10 hosts Hyper-V with multiple virtual machines, ...
2
votes
3answers
4k 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 ...
4
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1answer
2k views

Monitoring OSPF links with SNMP

I am looking for a way to monitor OSPF links using SNMP. I have attempted to try to poll the Neighbor State of a specific peer, looking for a value of Full, and going into alarm once the value is no ...
4
votes
2answers
1k views

Hiding hosts in Nagios

I would like to monitor a few hundred hosts using Nagios, yet I only want the switch fabric to show up in the statusmap.cgi. Is there a way to prevent a host from showing up in the status map, yet ...
2
votes
3answers
3k views

CentOS monitoring traffic on port

I am looking for a tool to monitor traffic on some ports of a CentOS server. On this server each service runs on a port from 3000 to 3050 and I would like to compare traffic consumption on these ...
1
vote
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 ...
1
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5answers
247 views

Finding malicious network usage in a LAN

I manage a small LAN (30 computers, mix of Linux, Windows, and Macs). Transferring a 100MB file to a local server (i.e. in the office, not on the Internet) used to take me about a couple minutes, but ...
2
votes
1answer
741 views

How To Setup “Performance Monitor” As A Bandwidth Counter?

I have managed to create a Counter for bytes/second on Windows 2008 R2. How can I actually count the bandwidth for my machine (inbound and outbound)? I am after the effects similar to DU meter. I ...
1
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1answer
511 views

estimating network capacity on AWS/EC2

I have a rapidly growing (10Ms calls/day) web service currently on one EC2 app instance running ubuntu10.04+ apache + APC + memcache (+ several master/slaves mysql farms on other instances). I ...
0
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2answers
933 views

Monitoring Tool for monitoring the health/uptime of my servers in the cluster (windows)

Are there any recommendation on free monitoring tool for windows? We don't need sophisticated tools. We just need to monitor the "health/status" and uptime of our database, load balancer and server. ...