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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25
votes
5answers
26k 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 ...
13
votes
4answers
23k views

Is there a way to get wireshark to capture packets sent from/to localhost on Windows?

Is there a way to get wireshark to capture packets sent from/to localhost? When I monitor traffic going from my computer to another, or from another computer to my computer, then it works. But ...
13
votes
3answers
23k 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?
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 ...
12
votes
7answers
26k 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 ...
12
votes
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) ...
11
votes
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 ...
11
votes
6answers
4k views

Visual Network Topology Map?

If I have no idea of the current network setup, and I'm connected to the LAN - is there any GUI that could possibly identify nodes visually or give me any sort of insight? I'm looking for a more ...
11
votes
4answers
1k views

Windows Domain replication monitoring tool

I am looking for web-based interface GUI, or some kind of monitoring tool that will show replication status for a domain. I know I can use repadmin with various options on the command line to query ...
10
votes
3answers
3k 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
9
votes
7answers
10k views

Key differences between Nagios and Open NMS?

I am looking to pitch a comprehensive monitoring system to my manager, and have been considering OpenNMS. However, I have seen glowing praise of Nagios on here and I was hoping someone with experience ...
9
votes
5answers
5k views

Solution to route/proxy SNMP Traps (or Netflow, generic UDP, etc) for network monitoring?

I'm implementing a network monitoring solution for a very large network (approximately 5000 network devices). We'd like to have all devices on our network send SNMP traps to a single box (technically ...
8
votes
5answers
888 views

What can SNMP be useful for in a small network?

I have been administering servers and clients in small business offices, and have never used SNMP. But I have read about it and it looks interesting. As what I understand, it is mostly useful if you ...
7
votes
5answers
890 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, ...
7
votes
1answer
9k 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 ...
6
votes
5answers
1k 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
3answers
1k 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 ...
6
votes
1answer
55 views

Devices with MAC's manufacturer section “00:FF:01”?

While monitoring my office's network, I have seen a huge amount of traffic coming from devices whose MAC address manufacturer part (the three most significant octets) is 00:FF:01 I can't see the ...
6
votes
1answer
181 views

What service/network monitoring tools set thresholds dynamically?

The place I work for is interested in purchasing a product that, among other things, doesn't set hard thresholds for application alerts. Rather, it detects peaks and slopes, etc., and kind of ...
5
votes
13answers
8k views

Network monitoring tool for FreeBSD [closed]

I am using FreeBSD 6.1 as router. Now I looking for Network Traffic Monitoring software to see what's happening with internet link. I have two installed LAN cards in my system, one for lan and other ...
5
votes
11answers
11k views

How Can I monitor internet usage within my lan

I'm the appointed IT guy at a business with 20 pcs, we have 1 sbs 2003 server, a consumer grade soho modem/router and a few network switches making up our lan. We keep on hitting our monthly ISP ...
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 ...
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 ...
5
votes
5answers
270 views

Identical traffic

I am running an application server and logging all requests for analysis purposes later. One interesting trend I noticed last night was, I had a visitor from Texas on FIOS share identical traffic ...
5
votes
3answers
13k views

Open Source / free choices for SFlow monitoring?

I found the list here: http://www.sflow.org/products/collectors.php But was wondering if there are open source projects like Zenoss or others that can do SFlow collection and reporting for more than ...
4
votes
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 ...
4
votes
3answers
4k views

Advanced traceroute tool for Linux

Is there comparable alternative for PingPlotter Pro on Linux? I'm looking for traceroute tool that has ability to display traceroute data of each nodes along the route in nice timeline graph.
4
votes
6answers
342 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 ...
4
votes
1answer
835 views

How the big guys monitor their servers?

I'm wondering what software the web scale guys are using to monitor their n arrays of servers in the server farm(s). What does facebook, twitter, digg use? How google does it? I'm looking for a ...
4
votes
5answers
238 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
6answers
329 views

Making hosted applications resilient to BGP failures

My company builds various web sites for its customers with a dedicated hosting provider. This hosting provider accidentally shutdown the devices responsible for Border Gateway Protocol (BGP) ...
4
votes
3answers
668 views

Network Sniffing and Hubs

This will likely seem naive to the experts... but it has been on my mind lately. For years I've been using ntop and a cheap 4 port hub to sniff client networks to determine who's doing what -- and ...
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 ...
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 ...
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 ...
4
votes
1answer
634 views

Bittorrent surveillance/monitoring

Is there any tool to sniff bittorrent traffic and reassemble data about the torrent? Im looking for file names, peers, tracker address, local IP, etc. This is purely for academic interest in which all ...
4
votes
3answers
3k views

How to simplify Nagios config in giant datacenter

Say I built 1000 servers from the same OS Image, everything is the same including SNMP configs (They all have unique IP addresses of course). For each server, I want to monitor the same 12 services, ...
4
votes
1answer
1k views

How can I monitor VNC via Nagios?

I have a number of remote sites which have VNC running on a few computers for support purposes. They are (obviously) only available on our internal network. I am using Nagios to keep track of all ...
4
votes
4answers
596 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 ...
4
votes
1answer
5k views

how to get a total bandwidth graph in munin

I have munin-node in a basic default configuration on all my servers, I would like to create a summary chart that displays total bandwidth in/out http and another chart showing total bandwidth in/out ...
4
votes
3answers
372 views

Reasonably-priced, multiple endpoint heartbeat software

We've got four servers in use for a mission-critical application that all need constant connectivity to each other--six always-up connections in total. I need a way to monitor these connections and ...
4
votes
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
127 views

dual interface NIC with hw bridging?

I'm looking for a PCI NIC with two PHYs that is capable of bridging/switching in hardware but allows the host to monitor the traffic. Does such a thing exist? This would be running on a linux host. ...
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.
4
votes
2answers
973 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 ...
4
votes
1answer
232 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 ...
3
votes
6answers
2k views

Determine who is opening a .PST file from a network drive on the local network?

Our system admin has been struggling with the issue of our network getting completely locked up when users open PST files from network drives. Apparently Microsoft is aware of this problem but there ...
3
votes
9answers
1k views

What are the best system monitoring/capture and reporting tools for medium sized business

The IT department has been growing over the last few years and we are to the point where we need to get some software to capture and report information from the computers, servers, managed switches ...
3
votes
8answers
578 views

After Hours Server Monitoring Procedures

How does your company handle monitoring and administering servers after-hours and during holidays? Do you require that some come into the office? If not, how do you insure that staffing is available ...
3
votes
5answers
8k views

How to capture Wireshark packets when using a switched network in Windows

I’ve been asked by our SIP trunk provider to run a Wireshark trace on the network when we receive calls. The issue I’m having is that if I run Wireshark from a laptop plugged into the main switch I ...