0
votes
2answers
64 views

How to troubleshoot network from customers perspective?

We have a web application that we host that is customized for multiple customers. Each customer accesses their version of the site via their own custom subdomain. We are running into an issue where ...
-1
votes
1answer
44 views

How to measure network service quality? [closed]

How can I say if my network as a quality service? According to wikipedia (http://en.wikipedia.org/wiki/Quality_of_service ), an example on how to measure the service quality is high bit rate, low ...
0
votes
2answers
31 views

Suspect UDP traffic on lo interface

I'm monitoring the lo interface with iptraf and am getting a lot of movement in the following form: UDP (268 bytes) from 127.0.0.1:49254 to 127.0.0.1:49254 on lo This message appears on average ...
-1
votes
2answers
70 views

Simplest way to monitor and log the internet traffic of a ubuntu server [closed]

I'd like to know if there is a simple program for ubuntu server (preferably 12.04), without too much configuration, which will allow me to check what processes are using internet bandwidth, how much ...
-2
votes
1answer
68 views

Layer 2 and 3 Network and Topology discovery of blackbox network [closed]

I have been given a company network to perform layer 2 and layer 3 network discovery. I have to find out the network topology and infomation about network equipments including switch, router, server, ...
-6
votes
1answer
91 views

How to monitor all network traffic [closed]

I have installled wireshark on my server but can only monitor traffic through the local nic but all network traffic does not go through the server. I would like to monitor all network traffic. Are ...
0
votes
0answers
55 views

monitor network bandwidth via ssh

I'm running a Centos 6.4 server with cPanel. WHM (admin side panel) shows about 100GB of bandwidth this month. However, the server's RTG shows 3.4TB last 30 days, 121GB past 24 hours alone. Doesn't ...
0
votes
3answers
116 views

Monitor HTTP usage on network from Linux free [closed]

I manage a small office network. I am looking to start monitoring/logging internet usage (website requests) for each user on a small network. All the windows clients are running through a switch to a ...
0
votes
1answer
45 views

Only one server behind a switch cannot access the internet and vice versa

I have multiple servers deployed behind a single switch. All the servers have their own public IP addresses. Suddenly one of them (say A) cannot be accessed from the outside by any means, e.g. HTTP, ...
0
votes
0answers
120 views

Cisco Prime NCS not starting

I have received the Cisco Prime OVA file and which we placed onto an Oracle virtual environment. We turn the VM on and the CLI boots, When we try to start the NCS service we get errors. ...
0
votes
1answer
65 views

tshark duration of a conversation for a ip address

i can retrieve the follow info from a .pcap : ================================================================================ IPv4 Conversations Filter:ip.addr==1xx.1xx.0.1xx ...
2
votes
2answers
103 views

Log incoming and outgoing connections on my Leased Line

I am a System Administrator at a college where we have a leased line internet connectivity and 32 Static IPs. The Local; network is running behind the Juniper Firewall. Now I would like to log all the ...
1
vote
0answers
62 views

How can I set ntop not to shorten host names?

With most screens in ntop, there is a list of hosts. Unfortunately, in almost every one, the host name is shorted, for some reason. When the host names follow the company standard, this results in the ...
0
votes
2answers
130 views

How can I scan using nmap and Zenmap all hostnames that begin with a particular string?

I have a number of nodes on a couple of networks whose hostnames all start with org. Some examples are: orgwebsvr1 orgwebsvr2 orgwebsvr3 orgdbsvrmysql orgdbsvrmssql orgdbsvrosql With nmap, I know ...
2
votes
2answers
140 views

What to use to get meaningful network statistics

A customer has a rack with some 1U servers and Dellâ„¢ PowerConnectâ„¢ 2716 switch at ISP's server room. One port is uplink to the ISP. Some servers run ESX5 while one 1U server is a plain Windows 2008 R2 ...
3
votes
2answers
602 views

Monitor Internet bandwidth by IP in a LAN environment?

I am new to networking so pardon if this is a stupid question. I want to see how my users use the internet bandwidth. I have around 50 Users in the network and I am using a checkpoint edge series ...
0
votes
1answer
47 views

Tracking data sent to remote host over time?

What is a a good way to track over time the amount of data transferred from my Linux server to another host on the internet? https and imaps only
0
votes
1answer
166 views

tell tcpdump to not include the port numbers in the output

how can tell tcpdump to not include the port numbers in the output? Right now it includes the resolved IP + resolved port. I just need the resolved IP address (hostnames)
0
votes
2answers
166 views

Is there any software to monitor bandwidth?

In our organization we have 3 servers that are located at the office and around 20 pc accessing the servers in the warehouse with distance between the pc and the server around 20 km (13 miles). Our ...
1
vote
1answer
265 views

How to diagnose intermittent connectivity issues

At work we are suffering some intermittent faults with the internet. This manifests itself as none of our desktop computers being able to make any requests externally including to ip addresses for a ...
-1
votes
1answer
102 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
114 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 ...
3
votes
4answers
218 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
0answers
50 views

How to tell which device might be dropping packets

We are trying to diagnose a chronic disconnection issue. Overnight, nearly every night, our HTTP long poll client is disconnected from the server. The most likely proximate cause is that the longpoll ...
1
vote
1answer
118 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. ...
0
votes
1answer
426 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
147 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 ...
5
votes
2answers
144 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
49 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 ...
0
votes
3answers
157 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
3k 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
0answers
224 views

Packets dropped at endpoint NIC — Windows 2003

I have a virtualized Windows 2003 server that hosts one of my pieces of server software. The problem is that the port listener of this server doesn't get the client traffic sometimes. With Wireshark ...
2
votes
1answer
129 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 ...
1
vote
2answers
245 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 ...
1
vote
1answer
275 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
299 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 ...
0
votes
2answers
398 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 ...
1
vote
1answer
152 views

Simple remote administration agent software [closed]

I am looking for a simple remote control, agent based software to perform simple commands to geographically dispersed workstations. I am looking for something similar to Microsoft Intune. I am open ...
1
vote
3answers
403 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 ...
9
votes
3answers
2k 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
votes
1answer
908 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 ...
0
votes
3answers
323 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 ...
3
votes
2answers
284 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
901 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
606 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
votes
2answers
1k 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, ...
1
vote
5answers
211 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 ...
0
votes
1answer
341 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
votes
2answers
379 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 ...
0
votes
4answers
127 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 ...