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, ...

learn more… | top users | synonyms

239
votes
45answers
54k views

Why is Internet access and Wi-Fi always so terrible at large tech conferences? [closed]

Every tech conference I've ever been to, and I've been to a lot, has had absolutely abysmal Wi-Fi and Internet access. Sometimes it's the DHCP server running out of addresses. Sometimes the backhaul ...
70
votes
8answers
51k 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 ...
30
votes
4answers
2k views

Our wi-fi at work is ridiculously slow, will adding more range extenders improve it?

At work, we have two wireless networks (e.g., Work1 Work2); the Work2 is used downstairs and Work1 is used upstairs. However, both are notoriously slow. The connection is better when we are wired in, ...
27
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
805 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 ...
14
votes
11answers
24k 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 ...
14
votes
7answers
9k views

Loopback to forwarded Public IP address from local network - Hairpin NAT

This is a Canonical Question about Hairpin NAT (Loopback NAT). The generic form of this question is: We have a network with clients, a server, and a NAT Router. There is port forwarding on the ...
14
votes
7answers
20k 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 ...
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
2k views

Penetration Testing [closed]

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
6answers
14k 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 ...
10
votes
2answers
277 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
20k 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
871 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). ...
10
votes
4answers
788 views

What to filter when providing very limited open WiFi to a small conference or meeting?

Executive Summary The basic question is: if you have a very limited bandwidth WiFi to provide Internet for a small meeting of only a day or two, how do you set the filters on the router to avoid one ...
9
votes
14answers
36k 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
5answers
9k views

What benefits do a T1 line provide over “business-class” cable?

We are in a semi-rural area, so our internet connection options are pretty limited. We currently pay about $500/month for a dedicated T1 line at 1.5/1.5 Mbps from the local ISP. In comparison, Comcast ...
9
votes
3answers
549 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
12k 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
2answers
4k 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?
8
votes
1answer
2k views

What is “commodity Internet”?

What does the term commodity Internet refer to?
8
votes
2answers
5k 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
863 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
5answers
1k 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, ...
7
votes
1answer
8k views

Who (What?!) is “http://1.1.1.1/bmi”? [closed]

I'm not sure if this is the place to ask but I found some pages who contain links in them that start with "http://1.1.1.1/bmi". Who or what is 1.1.1.1? or maybe http://1.1.1.1/bmi has a meaning more ...
7
votes
1answer
1k views

Debugging slow transfer rate from server

I'm trying to explain this as simple but documented as possible. This is not exclusive to this server or my current ISP. I've seen the same exact issue over the years while being with different ISPs ...
6
votes
6answers
563 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
496 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
7answers
8k 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 ...
6
votes
3answers
6k 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
1k 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
4answers
2k 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
1answer
2k views

How do captive portal network connections work?

Internet access at hotels, airports cafes is often gated by a captive portal which forces you to a particular web page on first use, for example a payment page or some page to accept a terms of ...
5
votes
1answer
139 views

Do you have to have two servers to put Exchange 2010 on the Internet?

I was reading about the Edge Transport Role on Exchange 2010. It looks like this is the only way to put Exchange the Internet. Is this true? Also, doesn't this require a second hub transport ...
5
votes
3answers
1k 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
2answers
214 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
144 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
3k views

internet connection in debian 6's recovery mode

I've broken my window manager on my Debian 6 machine, and so I am stuck to recovery mode for now. That is, I got a plain root shell. Now here's my problem: how can I get a internet connection, so I ...
5
votes
1answer
397 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
1answer
732 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 ...
5
votes
3answers
1k views

AT&T U-verse 2Wire Router - Increase session table limit?

AT&T U-verse VDSL "fiber to the node" 24Mbit down / 3Mbit up 2Wire Router Model 3800HGV-B Software Version 6.1.9.24-enh.tm The 2Wire router appears to have a limit of 1024 TCP and UDP sessions. ...
5
votes
1answer
4k 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
5k 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 ...
5
votes
0answers
365 views

Freebsd change default Internet channel route

I have two Internet channel and Gateway on freebsd. When I switch channel with the command route change default chan2, the command netstat -nr shows changed default route. But traceroute shows that ...
4
votes
3answers
11k views

How can I find out which server OS a particular site is running?

Is there a way to check which server OS a particular site is running. For example from linux command line. Maybe via telnet? But all I can get from "telnet www.google.com http" is: Trying ...
4
votes
7answers
728 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 ...