Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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2
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2answers
110 views

Central web login system for university

We have 300 hosts in our LAN. They use a linux server as default gateway. We need to send all traffic through a server machine which would then forward it to internet. I want to add a central login ...
0
votes
2answers
462 views

What is the risk of opening network port?

What can someone do if i write a program to open a TCP port and run, lets say an echo server? Can some one access data on my system? or any other risk of opening port?
1
vote
1answer
347 views

Windows Server 2008 is blocking IP of some clients

I'm having a very weird situation on my Window Server 2008 R2 hosts. In these hosts, we have an ASP.NET Application hosted with IIS 7.0. The problem is that, eventualy, one of the clients' IP is ...
3
votes
4answers
5k views

Amazon EC2 Public DNS is useless?

Seems the Public DNS, e.g. ec2-x-x-x-x.compute-1.amazonaws.com will be changed when you stop or terminated the instance. So this mean they have the same life span as the ec2 public IP address, so why ...
1
vote
2answers
950 views

ssh suddenly stopped working on Mac

Everyday I wake up and check the my servers are running smooth, I use my mac to connect to some ubuntu and some freebsd machines. But today when I tried something strange happened: $ ssh -v -p ...
5
votes
3answers
788 views

What's the best way to accomodate multiple devices that all want to use the same fixed IP address into the same LAN?

Suppose I have an ethernet capable device that has a hard coded IP address in it. I have software that works with the device, which could be configured to work with practically any IP address for the ...
3
votes
3answers
8k views

Linux, adding sub-interfaces

I'll start out by saying networking isn't my strong suit, I'm trying to configure a few sub-interfaces so that some code I am working will have more sockets to locally bind to. So far i've done the ...
0
votes
2answers
966 views

MX960 port mirroring only Tx or Rx side

On Cisco routers there is an option to do port mirroring only on Rx or Tx side, by using this command: monitor session session_number source interface interface-id [, | -] [both | rx | tx] (...
0
votes
1answer
55 views

network restricted website

How can I restrict my network connections to a only my web-server? EG, a user would connect to my network (WIFI/LAN) when they open a web browser and enter 127.0.0.1 it will load my app. But if they ...
0
votes
2answers
81 views

ubuntu eth0 up but not online

I've been installing an Ubuntu Server on a local machine. Ive configured the eth0 in the interfaces (Static) and I can ping the router aswell as other machines in the network can ping the server and ...
2
votes
2answers
431 views

How often does asymmetric latency actually happen?

I was reading through the Wikipedia entry on NTP, and noticed this: The NTP synchronization is correct when both the incoming and outgoing routes between the client and the server have ...
1
vote
2answers
3k views

Unable to connect to internet in debian squeeze

I recently installed Debian squeeze on my development machine every things went well i was able to connect to the Internet yesterday i moved my hard disk to another machine ,i can't able to connect ...
6
votes
1answer
3k views

How to traverse carrier-grade NAT (large-scale NAT) to reach VPN Server? [closed]

I currently run an OpenVPN Server via a home network connection that has a single, public, dynamic IPv4 address. My provider (AT&T U-Verse) will apparently soon switch to a large-scale NAT and ...
0
votes
1answer
398 views

PHP - Outbound connections to remote servers are failing

I have setup a blog although, it appears any connections going outbound (to remote server) are being blocked. My firewall is set to allow everything through (iptables) and this problem appears to be ...
0
votes
1answer
4k views

Optimize OpenVPN connection?

This is a big headache for me for a few days now. I having 2 servers on different location. We use OpenVPN to connect between the 2 servers. Server1 has a Uplink of ~100mbps (OPENVPN Server) ...
6
votes
3answers
7k views

nmap does not find alive hosts with ping scan

I try to ping scan my local network using nmap, but it doesn't seem to find machines that are for sure alive. It responses to ping but on to ping scan. Results for ping: $ ping 192.168.0.2 PING 192....
0
votes
2answers
643 views

LAN DNS hostname resolving over WAN [closed]

This has been bothering me for quite some time, I feel this may be possible, but given my decent knowledge of networking, I can't seem to figure how. It's easiest to understand with an example: if I ...
1
vote
3answers
144 views

SMTP server force outbound traffic

I'm having some trouble with setting up a SMTP server on a windows server 2003 machine, while trying to send emails using PHP through the internet, but to domain email addresses. Common info: ...
1
vote
1answer
1k views

Load Balancing, Active-Active config and dynamic server addition

Right. I'm looking into setting up a system something like this: / [Load Balancer] \ /\/\/\/\/\/\/\ [LAN1] - ----- | Server Pool | \ [Load Balancer] / ...
1
vote
0answers
88 views

Linking Linux and Windows Server for file sharing and editing over network?

I am having 2 computer on different network over internet. Currently I am trying to figure out away to connect between the 2 computer for a PHP script. Setting: -------------------- -----...
3
votes
1answer
3k views

Disable IPv4: What exactly does 'ifconfig eth0 0' do?

I'm experimenting with Linux and networks. What I'm trying to do is disable IPv4 for remote connections. It shouldn't be that complicated but I didn't find much about this topic. However, there is one ...
1
vote
1answer
658 views

Where is the ifcfg file of a (Host-only) virtual network adapter on CentOS?

I'm using a CentOS virtual machine, i have already assigned two network adapters using the VMware Workstation but the Virtual Network Editor lets you change only the Subnet IP, the Subnet Mask and the ...
0
votes
3answers
191 views

Anomalous behavior of Routers

I am observing anomalous behavior Cisco concerning routers. Scenario 1: Ping from Server A to Cisco Router 1905 - 0.3 ms Ping from Server A through Cisco Router 1905 to Server B - 3.2 ms ...
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0answers
1k views

FreeBSD Jail own network stack with vimage

I want to throw all services from the host system and put them in jails. Unfortunatly this doesn't work for file sharing (e.g. nfsd) because the jails don't have there own network stack by default. I ...
1
vote
0answers
464 views

WERR_ACCESS_DENIED - While rebooting Windows with Linux over LAN

We recently lost one of our Windows 2K8 servers while switching from Static to DHCP after a DHCP release command was inadvertently called. The server was still active but we were no longer aware of ...
2
votes
2answers
2k views

Multiple VPNs with one fixed external IP

I am in a shared working space, sharing with around 100 other companies. Lots of the companies need a VPN between them and developers working externally. The office has a very limited number of ...
5
votes
6answers
4k views

Log tcpdump Output

What I basically want is to to write all tcpdump captured packets to a file every 3 days. So basically tcpdump should run for 24 hours on day 1 and write the output to Day1.log and similar for Day2 ...
1
vote
1answer
86 views

Sharing network: windows host act as router for guests?

I want to pin my guest system to existing network - they must get ip from this same dhcp server like host and can communicate with host and other through this network. Can i do that and how?
0
votes
1answer
220 views

Dual SSH connection to Linux Desktop RDP

How can I explain this.... I have a remote ubuntu linux system that has it's desktop shared at a third party site. This system has a dynamic ip address, so I have setup a reverse ssh tunnel across ...
0
votes
1answer
451 views

Exchange 2010 with DAG - problems with communication

I've got 2 Exchange servers running HUB, CAS and MBX with DAG, 2 servers being Active Directory, 1 witness server and 1 TMG server. They are split evenly between 3 Hyper-V servers: Server 1 ...
3
votes
1answer
3k views

Rate Limiting with HP ProCurve 5406 QOS

Is it possible to enable an absolute value rate limit using QOS on a HP ProCurve 5406 switch for a particular IP address on a specific port? We have a 10Mbps head end connection for multiple ...
2
votes
1answer
539 views

Slumbering apache server refusing connections, but not via localhost

I'm pushing a moderate amount of traffic (about 20 req/s) to a simple PHP API running on an Apache server. The Apache server slumbers (mod_status barely registers one active request), however, I'm ...
0
votes
1answer
168 views

Identifying Google company resources versus App Engine resources

We are experiencing a problem with scraping on our e-commerce platform. It's not the scraping that is the problem per se, it's that whoever is doing it is spoofing a stale referrer full of our ...
2
votes
2answers
132 views

Border Gateway Protocol [closed]

I'm moving our company out of managed hosting into our own colocation. I have a variety of high quality options for bandwidth and my network consultant suggests we run BGP with multiple providers in ...
20
votes
4answers
15k views

Why do mobile networks have high latencies? How can they be reduced?

I'm increasingly seeing mobile networking technologies being used to get internet access in areas where it is otherwise not available. While mobile networking is usually not yet viable as the primary ...
0
votes
2answers
121 views

advice on gateway address

I am wondering if a node on a subnet should have its default gateway set to the IP of the router or should it be the IP address of the switch? In Packet Tracer, I am using the router's address as the ...
0
votes
1answer
109 views

OS X tools for testing & visualizing network performance between two points

A client of mine has had intermittent network issues between their office and their server hosted on AWS. A speedtest (at speedtest.net) shows their bandwidth is fine. When I test their server, from ...
0
votes
1answer
485 views

Ping/traceroute tool for OSX [closed]

Any suggestions for a network monitoring tool for OS X that can do the same functionality like Axence Nettools. Basically, I want to be able to track ping history and view them as a report. Other ...
2
votes
3answers
1k views

How to speed up Drupal 7 with remote DB (not DNS resolving)

we have Drupal 7 on Ubuntu LTS virtual machine (VMWare) with MySQL 5.1 server on the same physical server, but on a different virtual machine. The Drupal website is currently under development, ...
2
votes
2answers
61 views

Can I use address space from one Internet Registry in the region of another?

Is it possible for me to, for example, purchase address space from APNIC and then use those addresses in Europe or the United States? Would there be a cost or paperwork involved? Thank you.
0
votes
1answer
682 views

ARP Connectivity on cisco small LAN

I feel so lame to have this doubt, so there is the question : Why do I not have connectivity ? The case is simple, I have configured the topology and have connectivity between each PC and respective ...
0
votes
1answer
611 views

How to route, using Linux, from nested private subnets to internet [closed]

In our departement we have a blade system with one master node and four slave nodes that are connected to the master node. The system uses its own subnet (192.168.1.x) and only the master node is ...
0
votes
1answer
2k views

xymon configuration

I'm still beginner with linux and I really need help. On my local machine that is in LAN, I have installed xymon-4.3.7. When I type in browser http://localhost.localdomain/xymon/xymon.html it appears ...
0
votes
1answer
103 views

Is there a way to limit the number of connection made by an IP address to my Windows Server?

Is there a way to limit the number of connection made by an IP address to my Windows Server? I'm trying to restrict the number of connections used by a single IP address on my server
0
votes
1answer
420 views

What is the simplest way to route web traffic via separate (dedicated) interface? [duplicate]

Possible Duplicate: iptables - Target to route packet to specific interface? Ubuntu 12.04. So on the client's machines I've got two NICs eth1 and wlan0. I'd like all the web browsing traffic ...
1
vote
2answers
4k views

spanning tree protocol(STP) bridge priority configuration

I'm trying to figure out the appropriate spanning tree protocol settings for a redundant network topology I'm in the process of implementing. The graphic demonstrates what the physical layer will look ...
-5
votes
1answer
388 views

How to monitor traffic and bandwidth usage in complex network? [closed]

i work in a medium size company. We have 100 clients and 4-5 network switch. I would like to monitor bandwidth usage (peak, volumes) overall, not from my single pc. How to do ? Thanks
0
votes
1answer
115 views

Ubuntu server connection issue

I'm having problems with my server. The server info is below. The problem I'm having it just started a few days ago after a server restart. I use in my php code @get_headers($url); I'm also using ...
1
vote
2answers
654 views

Configure dhcp client to connect to the right subnet

Sorry if this sounds a bit muddled; I am fairly new to networking. My goal is to have two or more subnets on one network. When I add a new server to the network (a virtual machine), I want to be able ...
0
votes
1answer
91 views

Webserver cannot access external resources, but website is working fine

I have a pair of webservers (Windows 2008 R2) configured with NLB. The website on the server can be accessed without any issues by external as well as internal clients. But the neither of the ...