The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (often called TCP/IP, although not all protocols use TCP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, ...

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63
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8answers
36k views

How much network latency is “typical” for east - west coast USA?

At the moment we're trying to decide whether to move our datacenter from the west coast to the east coast. However, I am seeing some disturbing latency numbers from my west coast location to the east ...
26
votes
3answers
2k views

Is it safe to reboot a server open to the internet?

Specifically I have an iptables ruleset defined on a server running CentOS. Am I guaranteed / can I guarantee / how can I guarantee that when networking comes online (either at machine boot, or after ...
18
votes
6answers
774 views

Why do Facebook users sometimes end up on my site when they enter www.facebook.com in their browser?

Every few weeks I get an email (usually a very unpleasant one) or sometimes even a phone call from a Facebook user who believes that I am "hacking" their internet. They come to this conclusion after ...
12
votes
6answers
1k views

How do I acquire a domain owned by someone else?

We've been lusting after a dashless domain name for a long time. It's registered to someone else who doesn't use it as a public website, the whois data says it expires in a few years. What should ...
11
votes
11answers
18k views

Will a higher bandwidth Internet connection lower ping response time?

It sounds obvious that a faster connection lowers latency... But I wonder: I am working remotely on a host the other side of the world - light can only travel so fast (1 foot in a nano second) and we ...
11
votes
6answers
12k views

How to tell if it's your problem or your ISP's problem

I originally titled this "how to tell if your internet is down or your network is just screwed up" and Jeff's AI said that this questioned would probably be closed. Nevertheless, someone here is ...
11
votes
11answers
1k views

Penetration Testing

We're deploying a new website, hosted ourselves. Short of getting in white hats how would you go about penetration testing from outside the network?
10
votes
2answers
273 views

DNSChanger Malware / Rogue DNS - “Internet Doomsday” July 9

Back in late 2011 the FBI dismantled a large and sophisticated internet fraud ring behind the DNSChanger virus/malware. Part of this malware involved directing victim's DNS requests to rogue servers ...
10
votes
8answers
17k views

What's the best way to monitor Internet traffic for the entire office?

We currently have a T3 line for about 28 people and it gets deadly slow during the day so I need something to help track down why. I'm assuming someone is downloading something that they may not be ...
10
votes
3answers
726 views

No internet after dhcp lease renews

Today we had a number of machines stop getting internet access. After a lot of troubleshooting, the common thread is that they all had their dhcp lease renewed today (we're on 8 day leases here). ...
9
votes
14answers
31k views

How to securly join two networks together over the Internet?

Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you ...
9
votes
6answers
12k views

How does geography affect network latency?

I have the option of hosting our database/web server at a managed hosting company on the East Coast (US) or one on the West Coast (US). Our company is based out of New York City, and both hosting ...
9
votes
3answers
425 views

Irregular internet disruption: certain images and JS not loading

first time on ServerFault, and I've got a nice little conundrum. Since a few months now, we've been having issues with our internet connectivity. Environment: Servers: 2 Terminal Servers as an ...
8
votes
5answers
1k views

A website hosted on the 1.0.0.0/8 subnet, somewhere on the Internet?

Background I'm attempting to demonstrate, using a real-world example, of why someone would not want to configure their internal network on the 1.0.0.0/8 subnet. Obviously it's because this is not ...
8
votes
1answer
8k views

What exactly is the MTU/MRU issue, what it is caused by and how to fix it?

In cases of hanging, freezing, slow, unresponsive internet connections the cause is usually unreasonably identified as "MTU/MRU issue" with several hastily proposed "magic cures" (usually invalid or ...
8
votes
1answer
1k views

What is “commodity Internet”?

What does the term commodity Internet refer to?
8
votes
6answers
2k views

What is the best Domain Registrar? [duplicate]

Possible Duplicate: Who is a good registrar these days? What is your favorite (US) Domain Registrar? While this is not specifically a programming question, I host a good number of websites. ...
8
votes
2answers
4k views

Internet latency map

I would like to see a latency map, showing the lowest latencies achieved between various destinations around the world. What is for example the lowest latencies achieved between Denmark and India. ...
8
votes
4answers
822 views

Wireless AAA for a small, bandwidth-limited hotel

We (the tech I work with and myself) live in a remote northern town where Internet access is somewhat of a luxury, and bandwidth is quite limited. Here, overage charges ranging from few hundreds, to ...
7
votes
2answers
3k views

How IP addresses are mapped to Autonomous System Numbers?

How IP addresses are mapped to Autonomous System Numbers (ASNs)? Is there any reference database for it? Then how are these Autonomous Systems are geographically located?
7
votes
7answers
8k views

Software/hardware to build video streaming server? [closed]

I am looking for a video streaming server solution, something like online TV server, with ability to make live broadcasts in the internet. What software could you recommend for that? What kind of ...
6
votes
6answers
554 views

How does the internet really work?

Sounds like a dumb question but I bet a lot of people don't know either. I understand servers, clients, modems, routers, ISP's, ect; but what I don't understand is what makes up the backbone structure ...
6
votes
10answers
486 views

How to browse safely from a public internet computer?

I was reading this question when I thought: Some emergencies requires that you log on in e-mail or another sensitive sites in public internet computers. Remember that points: You cannot install ...
6
votes
3answers
5k views

Who does the nameserver 4.2.2.2 belong to?

Does someone know who is the owner of the Nameserver 4.2.2.2 ? I find a whois but I dont know the organisation.. Does someone know it ? Has someone searched before? Thanks for your help!
6
votes
7answers
857 views

Troubleshooting Website problems within the local network

Have an external website which opens fine on some PC's, yet seems to time out (or symptoms of timing out, but never actually does) on others. Seems to only affect (some) of our newer HP Pro 3305 MT ...
5
votes
9answers
1k views

How much traffic can one machine generate?

Can just one machine on our network generate enough network traffic, whether it be from malware or P2P or whatever, to affect all network/internet users? My company has many public machines available ...
5
votes
7answers
7k views

Accessing samba shares over the internet

What's a good, secure (ish) way to access a samba server over the internet? My first thought is to just forward the necessary ports on the router to the samba server, but I'm not sure how secure that ...
5
votes
3answers
483 views

Tools for Remote Control of Linux over internet [closed]

I am looking for some tools which can give remote control of a Linux machine over Internet. As of now I know of TeamViewer, but it looks like too expensive when used commercially. I being part of a ...
5
votes
3answers
1k views

What's so special about leased lines (T1, DS3, etc)

I understand the theory of having "dedicated bandwidth" but why would a small/medium business purchase a leased line for access to the internet? In today's day and age residential grade connections ...
5
votes
2answers
1k views

IP Routing - how does it work again?

Can someone explain how IP routing works to me? E.g. if i ping 123.123.123.123, how does each router know which way to go as shown in a trace route dump.
5
votes
2answers
211 views

Modelling University student Internet usage

I am working on a project for a university housing client where I need to model the usage patterns of students living on campus. There are obviously many variables at play here, I am keen to ...
5
votes
2answers
138 views

Effects of internet connection speeds on server queries

Can my internet connection significantly effect queries run on phpmyadmin? I am currently 18 down and 30 up. I switched internet connections today and noticed a deep drop in query performance. The ...
5
votes
1answer
356 views

What kind of fiber is used in Intercontinental connections? Are repeaters used?

I'm curious about the underwater Internet infrastructure that interconnects continents to each other. Can anyone elaborate on how it works, or any other details (such as security) of these wires?
5
votes
3answers
807 views

Two ADSL modems on one LAN

At the moment we have two buildings each with their own LAN's and each with their own internet connection through an ADSL modem, using their own seperate telephone line. Next week we are going to ...
5
votes
1answer
3k views

Opening RDP Files with browser

In my organization, we are planning to make RDP files available via web browser. The hope is that users can just point their browsers to one or the other RDP file and have the remote desktop client ...
5
votes
3answers
2k views

Allow and restrict remote sql server access

I want to expose my sql server instance via the internet. I've been programming asp.net to sql server for a long time, but for the first time i'm hosting the sql server myself instead of the clients ...
5
votes
3answers
4k views

Restrict Computer or Users from Internet but allow access to intranet and Windows Update / ePO?

So this may be impossible but I've been asked to try and find something about it. So far nothing I have found is possible. I need to restrict specific machines or user accounts from regular Internet ...
4
votes
3answers
476 views

Is Internet routing (BGP) fully automated?

If all the routing tables on the Internet would be erased simultaneously, will the routers be able to rediscover them automatically? I'm having an argument with a colleague who says that the RIPE ...
4
votes
7answers
584 views

multiple internet connection at office

We have been using two separate Internet connections in our office. People will share internet connection by setting their gateways to either of these. Gateway is one of our local server through ...
4
votes
3answers
204 views

How often does Google's web spiders crawl the web?

Just a few hours after having made some changes in the HTML of my site, I found that Google had updated its search result against my website. The Internet is so huge, how did the Google crawler do ...
4
votes
9answers
12k views

Best solution for Multi-WAN failover (inside & out)? [closed]

Looking for a way to setup 2 ISPs in failover mode, for both incoming & outgoing traffic, for our small (<100 devices) network. The leading contender for now seems to be the Peplink Balance ...
4
votes
2answers
165 views

Fiber vs. 2 separate business-class cable

We're completing renovation of our new office and need to make a decision on internet access. Our office will contain ~20 employees at the start and we may grow to ~40 in a few years. We have VOIP ...
4
votes
4answers
4k views

DNS issue on Windows SBS2008 - Some external websites unavailable

Since few weeks, some websites are suddently unavailable. We are getting a 404 - The web page requested cannot be displayed. Basically, the only way to fix this is when I restart the DNS ...
4
votes
3answers
335 views

Load balancing with Cisco router

I have a Cisco router with two bonded T1's which are setup as a VPN to the main office. We need more bandwidth but can't get other connections (or it's too costly), so I would like to have a dsl ...
4
votes
1answer
349 views

Designing segmented LAN with fairly shared hi-speed internet access on a tight budget

With another member of the owners' association, I've been tasked with designing and setting up shared, hi-speed, internet access, for our apartment building. We have very little budget and hope to be ...
4
votes
3answers
422 views

How do I diagnose network corruption on an Internet path?

I run a few hosts on network A that make requests to servers (which I don't own) on network B, somewhere across the Internet. Unfortunately, many of these requests get corrupted. If I make the ...
4
votes
1answer
2k views

New Fiber Optic Internet Connection, want to use Sonicwall TZ200 as main router, WAN/VLAN

Key Facts: We have a new internet connection with Movistar. It is a 100/10 Mbit line. We want to use the TZ200 as our main router. The Fiber Optic router is a ONT I240 The internet router that ...
4
votes
2answers
458 views

How to find the lowest latency midpoint between two geographic locations?

I'm looking for a geographic location (not service) to host internet services that will give me the lowest latency on connections from two other locations. How would I best determine the most ideal ...
4
votes
1answer
169 views

Calculating and billing IP multicast usage on the Internet

I've been searching for the reasons why IP multicast isn't widely supported on the Public Internet, and a commonly-cited reason is the difficulty ISPs have in tracking Multicast usage for later ...
4
votes
1answer
869 views

One Router and Two Switches

I have two switches and one VPN router and Two Internet ADSL Routers. The internet connection has been provided to two groups. Group A has no restrictions, that is for Executives and Department Heads. ...