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0
votes
2answers
41 views

monitor traffic at the scale of millisecond

I have several linux servers running Ubuntu 14.04, and turned them into a Spark cluster. At this point, I want to measure the network flow between the servers, at the scale of milliseconds, in order ...
0
votes
3answers
81 views

How to setup a traffic limit per user on OpenVPN?

I am setting up a VPN server using OpenVPN. The authentication method is the certificate one (different certs for client and server). The VPS has 1TB of traffic monthly. I plan allowing up to 4 ...
2
votes
0answers
35 views

Abnormal DHCP Android device traffic cannot be identified

Hi Serverfault community members. I've been trying to identify the source of an abnormal broadcast traffic generated by some Samsung Android devices with no success, so I ask for your help. I have ...
1
vote
0answers
26 views

How would I limit total outbound traffic?

I've had a look round and found solutions like tc to limit the total allowed bandwidth per user, but what I'm interested in is how to limit the total outbound traffic per user. I have a server with ...
-2
votes
2answers
35 views

How the Traffic Classes get defined

I often come across in networking related literature the term 'traffic class'. And it looks like it is platform specific, sometimes they talk about 8 traffic classes, sometimes about 64. 1) Is this ...
1
vote
0answers
25 views

Network Traffic fluctuating, even with loopback

I am using iperf tool to benchmark my network interfaces on two identical machines (Dell Blade Server M620). Both have given different results. On 1st machine, I ran server and clients as: Server =...
6
votes
1answer
39 views

How to extract X.509 certificate from live network traffic automatically on Linux OS

I will appreciate if someone can point me How to extract an X.509 certificate from live network traffic automatically during the handshake phase between client and server on Linux OS. A similar ...
1
vote
1answer
456 views

How to set up IAM Role Permissions for VPC CloudWatch logs?

I am trying to allow aws to start my log service, and I have my log streams, and log groups added already. When i got to my VPC dashboard, the status of the Flow Log I'm interested in says: Access ...
0
votes
0answers
39 views

Empty events for AWS VPC logs?

I have an AWS VPC instance (AMI Linux), and I'd like to see the event logs for insight into its traffic. So, I can run a command as follows: sudo aws logs get-log-events --log-group-name <my-...
0
votes
2answers
83 views

OpenVPN solution/options for traffic reduction?

I am looking into VPN for the purpose of traffic reduction on the client side. CPU load is secondary. Is lzo good enough to beat the overhead malus? Are there other options to tune compression in ...
2
votes
2answers
159 views

Potential traffic issues on one big(ger) subnet

Posts like this: Most traffic in a corporate LAN is client to server nowadays, and a router not very well setup rather becomes a bottleneck AND a SPOF. and 200+ clients on a subnet wasn't a ...
0
votes
1answer
46 views

What are the tools needed to best asses a load balancer?

I'm building a Paas with Docker container in the field of Networkf Function Virtualization. I need to deploy some load-balancers inside containers. I need to asses the load balancers in differents ...
-1
votes
1answer
85 views

Random spikes of high ingress traffic. What could be the cause? [closed]

I understand that this is rather a generic question but wanted to see if you all could offer some good feedback. Our business has three locations, one in the West Coast, two in the East Coast. Our ...
0
votes
1answer
398 views

HowTo: OpenWRT routing/tunneling all traffic through an inline Snort sensor

I want all traffic that hits the OpenWRT router redirecting/ tunnelin through a dedicated Snort/Suricata machine, before it leaves the local network. The Snort/Suricata machine should act as an inline ...
1
vote
1answer
180 views

High suspicious traffic + connection slow and disconnecting on VPS

I have a problem with my VPS hosted by OVH in France: I have a high traffic. If I look at ifconfig it gives: eth0 Link encap:Ethernet HWaddr XXXX ... ... ... RX bytes:...
1
vote
2answers
123 views

Clients phone provider claiming high latency over UDP, how do I test?

A client of our uses a hosted phone solution for his 50 agent call centre. They use a hosted dialer who make the out going calls, once the connection is made the call is passed to my clients user ...
4
votes
1answer
217 views

Incredibly high peak of traffic (Network In) on AWS [closed]

I've found something extremely werid on my EC2 instance today; a peak on the "Network In" that goes beyond anything that had happened before, as you can see in the screenshot. Any idea about how to ...
0
votes
1answer
262 views

Spam Traffic, DDOS Attack & Server Crashing

I am running phpfox application in my server under my main domain name fetlock.com and I am getting large amount of spam and also suffering from DDOS attacks from multiple IP addresses. My server ...
-1
votes
2answers
155 views

Suspect traffic from 185.0.0.0/8 [closed]

I have a server/gateway running Debian 7. There is a big incoming traffic (for a homemade server) from an ip address located at 185.0.0.0/8 network for more than 40k packets in 24h. I have blocked all ...
0
votes
1answer
535 views

how to forward all traffic on specific interface to ip address

I have one Linux machine that have 2 interfaces. The first one is used as a default one and provides access to internet, the second interface was added as a dedicated link to send packets from tcpgen ...
2
votes
7answers
4k views

Is it possible to redirect/bounce TCP traffic to an external destination, based on rules?

I'm not even sure if this is possible... Also, please forgive my ignorance on the subject. What I'm looking for is for "something" that would allow me to redirect all TCP traffic arriving to host A ...
0
votes
1answer
429 views

network gateway can't see traffic for monitoring

I've just setup a new CentOS 6.4 machine to act as a default gateway for the LAN at head office. It's primary task is simply to route traffic to the appropriate place, ie VPN servers or the firewall ...
3
votes
4answers
5k views

How do I get the number of (currently) established TCP connections for a specific port?

How do I get the number of (currently) established TCP connections for a specific port? I have managed to get counters for traffic working by doing i.e for outgoing RTMP. iptables -N $CHAIN ...
2
votes
6answers
778 views

Wireshark Capture Between Two Routers

How would one go about capturing OSPF traffic in Wireshark between two routers? I'm looking to do something like this: [RTR A] - - - [LAPTOP] - - - [RTR B]
-1
votes
1answer
358 views

How to test server under heavy network traffic? [closed]

I need to test our server infrastructure providing static content, under heavy traffic. I need to utilize 10GBps at minimum if our new CDN infrastructure is working correctly, or pinout bottlenecks. ...
7
votes
2answers
1k views

Varnish running out of open ports, lots of SYN_SENT connections

Recently we've been experiencing issues with our Varnish (3x) -> Apache (3x) setup, resulting in a huge spike in SYN_SENT connections. The spike itself is due to the amount of new traffic hitting the ...
-1
votes
2answers
490 views

Network bandwidth requirements for a one-way Active Directory trust

I am considering establishing a one-way trust relationship between a local Active Directory domain and a remote (across a WAN VPN) Active Directory domain. Since the bandwidth between sites is ...
0
votes
1answer
205 views

Capture traffic on web server

I have a web server that is accepting web service calls on port 8081 - I want to see the packets coming through. I tried using fiddler, but it doesn't see anything. I don't have access to the code, ...
-1
votes
2answers
587 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
3answers
1k views

Find whats using all my servers bandwidth

TLDR: how can I dig deeper into my Mac mini OSX server to determine what processes are consuming so much bandwidth, or where all the inbound traffic is coming from? Resource caching is on, all ...
0
votes
2answers
1k views

Monitor incoming TCP/UDP flood attack and graph it

I'm preparing a presentation on a security issue and want to include a demonstration. It won't be in real time, I just need to show some pictures of the results. I have some VPSes that will perform ...
2
votes
0answers
564 views

curl request results in heavy load on the server

We consume an XML Datafeed by sending cURL requests to the provider's server. They do not allow us to cache, so each pageview is a new cURL request. Twice this year, our server has crashed with the ...
0
votes
1answer
425 views

Python: how to calculate data received and send between two ipaddresses and ports [closed]

I guess it's socket programming. But I have never done socket programming expect for running the tutorial examples while learning Python. I need some more ideas to implement this. What I specifically ...
2
votes
2answers
138 views

Calculate data transferred in a local LAN

How do you calculate the data flown between a computer and the gateway computer. I have a Linux router/gateway running IP Tables which routes internet traffic in a LAN. I have individual users with IP/...
0
votes
2answers
595 views

capture nimbuzz traffic

I need to capture all the traffic, specially during login, between nimbuzz pc client and nimbuzz server. The reason is that i need to debug outgoing packets at login that mark the user visibility ...
1
vote
3answers
6k views

Windows 2008 R2 network traffic logging

Can you advise me a network traffic logger for Windows 2008 R2? It expected to be executed as service and gather simple data "source ip/port, dest ip/port, packets size". I have tried to use ETW ...
1
vote
1answer
800 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 ...
3
votes
3answers
2k views

Network traffic generator / simulator

Does anyone know of a traffic generator that can generate or simulate network traffic for example http, ftp, smtp, instant messaging and voice plus video over IP traffic. I need the different traffic ...
3
votes
4answers
1k views

What tools should I use to assess bandwidth for web server farm..?

I'm contemplating moving datacentre and I need to know the size of pipe I'll need in order to get a quote. Currently I'm charged on GBs of traffic per month (currently about 42GB inbound - so ...
0
votes
4answers
384 views

How to determine the cause of high resource usage for two hours last week?

I know there are several tools I can use to find out what's causing heavy network and CPU usage right now, but every so often on my server I'll check the logs and notice that there were periods of ...
1
vote
1answer
663 views

Can't see traffic in my guest OS with tcpdump

I've created a virtual machine (Centos 6.0) using QEMU/KVM, which is also running on a Centos 6.0. The virtual machine is configured to have two NICs. The first NIC is using a bridged network (eth0 of ...
11
votes
3answers
6k 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
1
vote
2answers
125 views

256k speed connection to host multiple users

I've been given a 256k modem for a 2 day event to allow users access to the internet. There will be multiple connections (I anticipate 30+). How can I set this up so that it can support that many ...
0
votes
3answers
70 views

How can I track which page is being requested using multiple VirtualHost in Apache?

I have an Apache 1.3 web server configured with several VirtualHost entries that serves multiple independent websites. At certain times Apache receives a huge amount of request, which causes the ...
0
votes
2answers
204 views

SYN packets sent from one server but never arrives at destination

I am troubleshooting network problems for a client, remotely. The problem they have is that they get "connection timed out" occasionally between a web server and and a back-end search server. They can ...
1
vote
1answer
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. ...
4
votes
1answer
2k views

How to reproduce http traffic of a real site in another environment (e.g. VM)

There is a bug in my web application which I cannot reproduce. All the logs look ok or at least I cannot see anything unusual. But it happens. So I thought I could record all the traffic to/from my ...
0
votes
1answer
89 views

How to stop a traffic capture?

I have created a topology on GNS3. I started a capture with the command - capture R5 f0/0 ping.cap How do I stop the capture?
-3
votes
3answers
134 views

Measure ip/port traffic [closed]

We have a small data center here in Brazil to host our servers. Now we are planing to provide some colocation and VPC hosting, and we need to measure monthly traffic of each ip/port. We can't to ...
-1
votes
4answers
174 views

Access Application Server from internet

I have Suse server running on one of my lan machines ,localhost, and it is running Websphere application server. I am also running an http apache on the same machine. I have configured my wireless ...