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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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 ...
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2k 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 <...
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513 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 ...
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3answers
359 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 ...
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2answers
380 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 table"...
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detect weak encryption and outdated protocols

I'm looking for software that helps detecting applications that use weak encryption or outdated protocols in a central place.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 ...
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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, ...
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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, ...
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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 ...
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3k 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 ...
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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 ...
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4k 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 ...
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2k 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 ...
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281 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 ...
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988 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 ...
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1answer
644 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 ...
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2answers
1k 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. ...
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210 views

Finding the executable sending packets to a specific IP Address?

We host Game Servers off of Windows Server 2008 machines, and we just received a report that one of our customers is using their server to do some type of UDP attack. The person being attacked ...
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1k views

Unix software to continuously monitor packet loss

I'm looking for some software to monitor packet loss or packet retries. Preferably something that continuously monitors vs. a testing approach and preferably free. My server's OS is debian. I'm ...
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3k views

Ntop alternative that stores persistent data

I'm looking for a tool to passively listen on a mirroring port in order to collect statistical data about network bandwidth usage, protocols, hosts, etc. Ntop is great. But once restarted it (almost) ...
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3answers
380 views

Best graphing tool to monitor mem/cpu/traf? [closed]

I am using Rackspace Cloud, oddly they don't have any way to measure your resource utilization considering it is a cloud service so I must find the best way to measure this so I can see when I should ...
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How passively monitor for tcp packet loss? (Linux)

How can I passively monitor the packet loss on TCP connections to/from my machine? Basically, I'd like a tool that sits in the background and watches TCP ack/nak/re-transmits to generate a report on ...
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398 views

can an ISP keep track of websites/links a customer visit/download? [closed]

I know in a home network, there are softwares that can monitor the TCP conversation occurred in the network and are capable of recording the download links sent from a computer. But my question is ...
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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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Can nTop process sFlow data to reveal source and destination to be reviewed visually?

I tried rephrasing the question title about five times before arriving on this title. Does nTop have the "built-in facilities" to process sFlow data so that a graph of source and destination of ...
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166 views

Detecting a host doing a port sweep across multiple interfaces/networks

I'm trying to set up a honey-pot like machine that would detect port sweeps from multiple networks with multiple interfaces. As an illustration, if I could set up a box with eth1, eth2 and eth3. ...
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149 views

Keeping Track of LAN IPs without Access to Router

I'm creating an application that needs to track slave machines on the local network. I came across this post: Set up to resolve local ips However, if the local ip assigned to the various hosts change,...
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427 views

virtio /proc/net/dev

we are doing some VM (citrix-xen) / real machine benchmarks at university and ran accross a strange behavior. we used netperf's stream test to meassure the performance between the two machines. both ...
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202 views

Network monitoring per user

We dont have to many restrictions on the net in our domain right now. Normally its fine (we use fiber. 20 down and 35 up) with 40 users this isnt normally a big deal. Every now and again the ...
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53k views

View installed programs on remote machine?

I was wondering if there is an easy and lightweight method to viewing what programs are installed on a remote machine? I am tempted to use Spiceworks but I would like something more lightweight like ...
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2answers
567 views

request.status 12031

We develop a web application for internal use at our client sites, and it relies heavily on ajax requests. We have 20+ clients nationwide, many of whom are on the same version, and most with a high ...
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5answers
5k views

Monitor traffic by source/destination IP address

I need to monitor traffic coming in and out of my server. Knowing the total in/out bandwidth is good, but ideally I would like to know how much traffic was sent to what address (we are talking about ...
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finding a spamming computer on the network [duplicate]

Possible Duplicate: How do you detect a spambot on your network? Our network of 120 windows machines has 1 or more computers sending spam. Is there an easy way to find that machine, without ...
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130 views

Custom server monitoring: Monitoring number of specific files in specific directory

I have many server running on live. Each server has many application. Each application has directory like /etc/somedir1, /etc/somedir2 where in each of that directory has many .html files. The ...
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HP Procurve 5406ZL - How to enable port-mirroring?

How would you enable port mirroring for a HP Procurve 5406ZL? The configuration guide is not very clear in the mirror-port function. I know that I'll need to use the mirror-port [[ethernet] PORT-NUM]...
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93 views

Software to monitor Bandwidth, Memory Usage, Load, Etc [duplicate]

Possible Duplicate: What tool do you use to monitor your servers? Hey I'm just wondering if there's any software available to monitor Bandwidth, Memory Usage, Load, etc. Doesn't matter if it ...
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3answers
1k views

arp table filling up

I have a CentOS 5 system which serves as an IPSec VPN connector between my network and a couple of remote networks. Lately it is running into this problem once or twice a day where its ARP cache gets ...
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758 views

ntop: Which HTTP downloads (URLs) caused the traffic?

My server causes too much traffic, so I have installed ntop to monitor it. On the Summary -> Traffic page in the Global TCP/UDP Protocol Distribution table I can see the traffic is periodically ...
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167 views

HTTP probing utility

Looking for a probing utility that will periodically issue HTTP request and somehow provide an output (CSV/UI) on web server / network response times. Nice to have: JavaScript-parsing ability to ...
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383 views

HP Network Device Management Software

I look after a network with 11 x new HP v1910 24-port 1GB switches and 2 x HP 4204vl 1GB Chassis switches. I'm looking for software to enable me to: Map the network graphically - there are a lot of ...
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413 views

What is the impact of intermittent traceroute timeouts

There are intermittent timeouts upon doing traceroute to an IP address. What impact does it have on say when you are trying to connect to a DB from an App server? traceroute to <IP>(<IP>),...
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Too many incorrect checksum errors in TCPDUMP

I find too many incorrect checksum errors from a TCPDUMP done on a GNU Linux 64bit server. There are close to 50% incorrect chekcsums in the export? cksum 0xe61f (incorrect (-> 0x8c37) How can we ...
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1answer
442 views

Embedded device for deploying network probes

Our environment has a multitude of remote subnets that we monitor by deploying Linux-based probes running various network monitoring software and other handy tools. Currently we're using surplus-ed ...
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438 views

Monitoring instantaneous network throughput at one second intervals?

For a testing setup I have, I need to monitor the throughput through a "router"* at regular intervals of around 5 seconds or less (sub-second intervals would be very nice, but not required). Ideally, ...
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445 views

How can I monitor the network on ESXi node for connections and find the source of a ddos attack

I'm looking for something fairly simple to install, that will monitor network traffic on the vswitch for my esxi node as we're getting ddosed and I need to be able to easily see where the traffic is ...
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3answers
173 views

Looking for a host based network monitor solution

Hi all! Problem So, my hosting company has a network usage graph for my dedicated server. It seems that one day earlier this month, my network usage suddenly spiked with several hundred megabytes ...
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227 views

CPU & Memory Usage Log & Performance

I want to have an idea of the amount of CPU and memory that is being used. I have a website hosted using IIS, and have clients connecting to it. I want to find out the amount of load that the CPU, RAM ...
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144 views

View IIS application responses

I know IIS logs all requests made to the server. If my application makes requests out to other web services, is there a way to see what the response was or at least the headers of the responses?
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74 views

Should I block any services for internal network?

I'm running a small business network, and the previous net admin allowed all services via a firewall management router. My question is whether there are any services that I should be blocking ...
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528 views

How can i measure the load of a WAN Connection with Wireshark?

I have a 100 Mbit WAN connection and want to check the load on it for a week. So I put a hub (10/100Mbit) behind the WAN connection and connected a laptop with wireshark on it. Here is now my ...