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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28
votes
5answers
33k views

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 ...
0
votes
2answers
395 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 ...
12
votes
5answers
7k 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 ...
1
vote
0answers
329 views

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 ...
1
vote
1answer
152 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. ...
0
votes
4answers
136 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 ...
1
vote
1answer
361 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 ...
3
votes
2answers
185 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 ...
14
votes
7answers
32k 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 ...
3
votes
2answers
410 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 ...
1
vote
5answers
3k 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 ...
2
votes
2answers
137 views

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 ...
1
vote
5answers
127 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 ...
2
votes
1answer
9k views

HP Procurve 5406ZL - How to enable port-mirroring?

This is my first time asking a question here but I've been lurking around Serverfault and Superuser for a bit. I've tried searching for this but I have yet to find something that would be able to help ...
0
votes
2answers
87 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 ...
2
votes
3answers
955 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 ...
2
votes
3answers
580 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 ...
0
votes
4answers
122 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 ...
1
vote
1answer
332 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 ...
0
votes
2answers
328 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 ...
9
votes
1answer
11k views

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 ...
2
votes
1answer
353 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 ...
1
vote
2answers
311 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, ...
0
votes
1answer
403 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 ...
2
votes
3answers
160 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 ...
0
votes
1answer
207 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 ...
2
votes
3answers
132 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?
1
vote
1answer
69 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 ...
2
votes
4answers
484 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 ...
1
vote
1answer
556 views

Linux network connections logging

I have linux (OpenSuse) testing server and I would like to have detail log about http and ftp connections (and maybie other TCP connections). Informations I'm interested in are IP address, transfer ...
1
vote
2answers
128 views

Monitoring network connection of Windows Server in real-time

I'm looking for a way to monitor the network connection from my PC to a Windows Server running on our network. My PC is running Windows 7 and the server is running Windows Server 2003 R2. I'm looking ...
4
votes
5answers
241 views

Server Cloud Monitoring

I'm a consultant that has around 100 clients and I would love to monitor all my clients networks, preferably from the cloud so I can tell if their Internet is down. I would like for it to offer a lot ...
4
votes
1answer
238 views

“Enterprise Monitoring Solution” with the lightest agent?

I have a network of disparate remote VPS / "cloud" / colocated servers that I would like to monitor from a central location, using open source software like ...
0
votes
1answer
501 views

internet connection monitor

I am looking for a tool to check my internet connection (by pinging something and/or retrieving a web page) and when the connection is lost to execute some command (sending an e-mail, resetting my ...
14
votes
3answers
29k views

How can I filter https when monitoring traffic with Wireshark?

I want to observe the HTTPs protocol. How can I use a Wireshark filter to do that?
2
votes
1answer
1k views

How to monitor current output/receive queue length in Linux

I want to check the capacity and performance of my network. Besides checking the txkB/s and rxkB/s via Sar, I'd also like to see the average queue length of the network interface(so that the average ...
0
votes
3answers
118 views

I want to be notified when a LAN IP goes live

Is there a tool or something that can notify me whenever a local IP goes live on my network. It could be that it continually ping that IP and display a notification to me whenever that IP return a ...
2
votes
1answer
168 views

Low bandwidth when accessing websites outside my country

I am using a broadband internet connection from an ISP named Reliance in India. I wanted share you with a weird behavior of my internet connection. I have a 2Mbps connection and I get around same ...
2
votes
5answers
482 views

Figuring out what's causing a server to slow down

I have a potential client that has a php site that performs fine most of the time. However, every week or so, it will experience lag (slow page loading). I am sure there are a myriad of things that ...
1
vote
1answer
534 views

How to detect pid that generates outbound traffic on Solaris?

Is there a firewall of some sort on Solaris that will let me define a filter, for instance outbound traffic to a certain range of ip adresses and port, but instead of blocking the traffic I want to ...
4
votes
2answers
2k views

How can I use nagios to monitor ssh tunnels?

I have a server that is used a middleman for a bunch of reverse ssh tunnels. I want to use nagios on that server to monitor that all of those ssh tunnels are up. Essentially I want to do the nagios ...
1
vote
1answer
152 views

Monitoring network usage according to IP address in Wireless network

Hiii, I have an internet connection which is shared by 8 users via an D-Link N150 wireless router. It is 1Mbps connection and we want that no one should download in excess when everyone is using the ...
4
votes
6answers
349 views

Can you totally ban a PC from the local network?

I was wondering whether it is possible to ban a PC from LAN or WLAN totally or not? I know that banning according to MAC address is useless, as it can be altered. P.S: assume that no credentials are ...
1
vote
1answer
143 views

Client PCs take turn on network-spamming our domain controller - rundll32.exe seem to be the culprit

at my small office we've stumbled upon a strange problem which have started during today. It all started with our network seeming sluggish and unresponsive - user's complained about slow connection ...
0
votes
1answer
482 views

Monitoring multiple sites on a single server using OpsView

We have several web servers. On each of these servers there can be ~250 web sites. I need to add a HTTP check for each site on each server. Each site has a reserved host header that we know can always ...
2
votes
1answer
110 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 ...
1
vote
2answers
4k views

Problem with Icinga web installation - server side errors

I have successfully installed and configured Icinga 1.3 and got the basic web interface up and running and all is good. I'm now trying to get icinga-web to work. I've followed the instructions ...
0
votes
3answers
2k views

Nagios Best Practise [duplicate]

I have installed Nagios on my network, and I have some beginner questions. I would like to get some "best practice" information about the following types of server: Web Server Exchange Server ...
0
votes
2answers
3k views

How can I see http/https URL's in Microsoft Network Monitor 3.x capture files?

I've used Microsoft Network Monitor 3.x before for various reasons but realized today I don't know how to tell the URL inside a conversation. I've got it set for "Windows" Parser Profile and I see a ...
4
votes
4answers
615 views

Network monitoring tools with API features [closed]

We use ks-soft's Advanced Hostmonitor package to monitor around 2000 items on our network. We think it's great, the chap that supports it is fantastic, the product is fast, stable and mature but I ...