Tagged Questions

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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-1
votes
1answer
114 views

Vlan and Switch setting - dummy [closed]

I need to speak tomorrow the network engineer and I would like to understand his so apologise for the Dummy question: In the school we have a cab with a 24 port Netgear manageable switch with an ...
0
votes
1answer
117 views

Linux measure network bandwith

I have a one way connection between 2 computers (both Ubuntu). I am looking for an easy way to find the max bandwith. I need to find the max transfer rate between computer A and computer B without ...
2
votes
2answers
109 views

how to track which switches, routers are being affected by ddos

I have an enterprise network system which has a router facing the internet, beneath it a virtual chassis switch, below it an access layer switch and finally a server. My question is that when there is ...
1
vote
2answers
180 views

How to monitor how much data transfers between Exchange servers in DAG?

I recently installed a second Exchange Server (standard, 2010) to our organization as part of a Disaster Recovery solution. The two servers will soon be part of a DAG. Before placing the server at ...
-1
votes
1answer
344 views

What options do I have for monitoring internet usage by user and sites [closed]

I want to set up a linux server (ubuntu server 12.04) on my home network to monitor the internet usage and find out the users and websites that use the most bandwidth. I have looked at squid and it ...
0
votes
1answer
254 views

How to know why server traffic is used and what is using it? (windows os)

I have a VPS on which I have Windows Server 2008 R2 installed. My monthly traffic is near 100 Gigabytes per month, and I don't have heavy sites on it (no download center, no movies, just text and ...
-1
votes
2answers
330 views

Tool to analyze the real time traffic in Windows XP SP2 [closed]

My client machine/(s) is/(are) Windows XP SP2. I can’t effort every time to have physical access to my server machine. To analyze the real time traffic and bandwidth between client and server machine, ...
1
vote
1answer
227 views

What is the best way/tool to analyze raw data(network stats) from Simulation?

After running a simulation(using a simulator(QualNet)) of a simulated network I end up with ip stats stored in a database, I then extract the data to a csv file So now I have 750mb of raw network ...
2
votes
1answer
909 views

Windows server sending constant ARP requests to offline devices

We have a Windows 2003r2 server which is sending intermittent ARP requests to several devices which are no longer on the network. The result of this is disruption to a PLC which is running over ...
1
vote
2answers
618 views

Using runit and monit to run / monitor services

I am configuring some services to run on Ubuntu server. I was going through the link below where they use runit to run the services and monit to monitor the services - ...
3
votes
4answers
266 views

Creating an office network and monitoring all activity without a proxy

We are setting up our office network and would like to track all the websites visited by our employees. However, we would not like to use any proxy based solutions. Our work is highly dependent on ...
0
votes
1answer
100 views

Total Network Monitor plus Autotask

I apologize if this is not posted in the correct area. I'm currently using Total Network Monitor to keep a basic eye on my network. My company is also about to implement Autotask. Is there a way ...
3
votes
2answers
2k views

unexplainable packet drops with 5 ethernet NICs and low traffic on Ubuntu

I'm stuck on problem where my machine started to drops packets with no sign of ANY system load or high interrupt usage after an upgrade to Ubuntu 12.04. My server is a network monitoring sensor, ...
3
votes
1answer
268 views

How to find the reason for a weekly downtime on an Ubuntu web server hosted by AWS?

We started monitoring our web server using Pingdom and found out that we have a downtime of a few minutes every Sunday at 0:00 UTC. The test runs every minute and checks if a successful HTTP response ...
1
vote
1answer
122 views

Slow internet connection for no reason

We have a cable internet connection. I've called the company when this happens and they say there's been no downtime on the modem and the signal is strong and there's no fixing or outages in the area. ...
-6
votes
3answers
52 views

Does apache log client IPs [closed]

Does apache log client IPs per request by default? If not, what are some common ways to do this?
0
votes
1answer
619 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 ...
0
votes
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
192 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
163 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 ...
0
votes
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 ...
1
vote
1answer
134 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
103 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 ...
0
votes
3answers
163 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 ...
-1
votes
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 ...
0
votes
3answers
902 views

Debian Squeeze - Monitor outgoing traffic

I have a small webserver that running on Lighttpd 1.4 which steadily uses 250GB or less bandwidth for the past couple of months. But since May the traffic spikeed to more than triple of what it was. ...
0
votes
1answer
420 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
votes
1answer
162 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?. ...
1
vote
1answer
484 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 ...
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 ...
1
vote
1answer
279 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
votes
1answer
198 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
votes
1answer
504 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
votes
1answer
361 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 ...
-1
votes
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
549 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 ...
2
votes
2answers
5k 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
795 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 ...
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 ...
2
votes
1answer
149 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
305 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
votes
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
369 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
458 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 ...
1
vote
2answers
895 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 ...