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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14
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7answers
10k 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 ...
239
votes
45answers
55k 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
54k 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 ...
4
votes
1answer
18k views

How are cellphone IP addresses assigned?

When my cellphone accesses a website via the tower and its GPRS gateway, NAT ensures that the sites receive a public IP. Would all phones using a single tower have the same IP? If yes, then how can ...
10
votes
6answers
15k 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 ...
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.
14
votes
7answers
22k 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 ...
8
votes
1answer
13k 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 ...
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 ...
2
votes
2answers
7k views

how to forward wlan0 to eth0?

I get internet from my wireless wlan0 and I would like to forward it to eth0 which is connected to another laptop. How can I do that? Thanks. Edit: my wireless card is intel: 0b:00.0 Network ...
4
votes
9answers
13k 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 ...
2
votes
1answer
203 views

Hosting: Location, location, location

What factors generally seem most important if you have issues of geography that seem relevant for providing an internet service and freedom to choose between locations. How do you evaluate them? A ...
2
votes
3answers
18k views

How to switch proxy settings via script?

There are a number of users in our organization that use their laptops on multiple networks. Each network has its own proxy setting requirements for accessing the Internet and currently, the users ...
1
vote
0answers
274 views

Conigure Linux server to do lawful interception

I have a server that makes the routing for my LAN (Linux, CentOS). I would like to have on it the possibility of lawful interception: I want to be able to see all network traffic that was done from my ...
1
vote
1answer
592 views

filtering request from IIS and redirecting it to Glassfish

I have IIS running on my server on 80 i want if request with /webapplication comes then the request should be redirected to my glassfish from IIS it self glassfish is running on 8080 how to configure ...
1
vote
2answers
174 views

Are WiFi Max Solutions worth considering

We are looking at ways to help cut our costs and our T1 contract is up. We have run across a local company that offers a 2mbit WiFi Max solution that is considerably cheaper than a T1. They have a ...
0
votes
2answers
518 views

how to publish web service on internet

I developed web-services in c# and published on IIS now i want to take this web-services out of Intranet to Internet i am looking for what are possible solutions for this. I am very much beginner to ...
0
votes
5answers
4k views

The difference between ping and pathping command?

today I want to ask you a question about internet network command pathping = tracert+ping, so what is the difference between ping and ping in pathping command?
-10
votes
2answers
1k views

How to permanently and irrevocably block websites on Firefox? [closed]

With Internet Explorer it's simple: you go to the settings menu, add websites you want to block, just randomly enter a sequence of letters and numbers so you cannot ever know the password, and it's ...
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
8answers
21k 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 ...
3
votes
10answers
6k views

Is it possible to merge multiple internet connections?

I have two internet connections at my place but the faster one is actually unreliable. :( One is a broadband modem connected to PC via ethernet. The other one is a USB modem. I would want to run ...
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
6answers
566 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 ...
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 ...
3
votes
3answers
12k views

Changing IE Home Page through GPO? [duplicate]

Seems this should be simple, but I'm unable to find the combination of GPO options to default the home page so that the user can't change it, but to let them add any of their own home pages to the ...
2
votes
1answer
4k views

How do I setup routing for two companies with different Internet connections on the same LAN?

Here's the setup: Two companies (A & B) share office space and a LAN. A 2nd ISP is brought in and company A wants its own Internet connection (ISP A) and company B wants its own Internet ...
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 ...
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 ...
3
votes
3answers
676 views

how to connect 2 independent computer networks?

I have 2 independent networks that are connected to internet. Each systems in a network can connect to the internet through the corresponding router/NAT device. i wish to connect these two LANs. I ...
3
votes
4answers
6k views

outbound ports that are always open

What are some ports that can NEVER be blocked outbound in firewalls, as doing so will stop basic internet use? Some I can think of are: port 53 udp/tcp -- dns, blocking this will prevent users ...
-1
votes
1answer
180 views

DNS Error server 2012 domain

We have a server running 2012 essentials as Domain controller and DNS and a few other bits. But over the last few days suddenly all the client computers on the network have lost Internet connection. ...
10
votes
2answers
278 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 ...
4
votes
3answers
423 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 ...
3
votes
1answer
81 views

Somebody created subdomain without my knowledge. How? [duplicate]

Got an interesting email from CIRA today with: CE14-12545 [Malware hosted on ygglhalayvtwy.khabarov[.]ca] URL: http://ygglhalayvtwy.khabarov[.]ca/xnor/orladjaup.jpg IP: 204[.]44[.]87[.]184 MD5: ...
2
votes
1answer
3k views

Windows Server 2012 guest machine no internet or LAN

I have a windows server 2012 with hyper-v added as a feature. I have created a server 2012 and a windows 8 guest machines. The windows 8 machine has internet connectivity and can successfully be added ...
2
votes
5answers
3k views

Downloads pause and time out frequently

I'm a new systems and network admin. My experience has been in the hardware and software of systems and servers, the network part is pretty new to me. I'm familiar with plugging numbers into network ...
2
votes
3answers
796 views

Intranet radio station over network

My company runs shopping centers around the country and from time to time we receive complaints regarding the music selection playing in the shops. I'd like to build a centralized music streaming ...
2
votes
2answers
284 views

Route over the public interface or the VPN?

I have a site-to-site VPN between two offices. Office A hosts a web service that Office B wants to access. The web service is accesible from the public internet (http://www.example.com) and on the ...
2
votes
4answers
120 views

routing tables — dell powerswitch 2724

I was hoping to know if there is a way to direct all traffic to a specific url, to the server it corresponds to on our local network with out having to go out into the internet. It would be way more ...
2
votes
3answers
2k views

Unable to ping or access internet

I am setting up a private network. The server is Windows 2008 R2 with DNS installed and has a fixed external IP address. ipconfig outputs the following: PPP adapter RAS (Dial In) Interface: ...
1
vote
2answers
306 views

Can I capture ISP SNMP information with Wireshark?

I am trying to do some heavy digging into SNMP, BPI+, ISP networks. Since wireshark can be used to capture network data, would I be able to use it to remotely capture my ISP SNMP agent information and ...
1
vote
1answer
258 views

PAT users can't access website, but NAT users can?

I'm a web developer who makes and maintains websites so I don't have extensive knowledge of networking. I work for a small company that uses a third party hosting service to host our website. One of ...
0
votes
1answer
14k views

Internet connection sharing windows server 2008 R2

I have one windows server 2008 r2, and that server has 4 network interfaces (3 private, 1 internet connection). I would like to share internet connection with other 3 networks. Windows server firewall ...
0
votes
1answer
990 views

Intermittent disconnect: which needs replacing, the router or the modem?

We have a WatchGuard SOHO 6 with the latest firmware (6.4.1) and an ISP-supplied DSL modem. The firebox's PPPoE settings look like this: We've been having a problem lately where our internet ...
0
votes
2answers
685 views

Networking Software Testing - How do I use a proxy server?

Is there a free proxy-server service that I can configure my computer (Windows 7) to connect to the internet through? I'd like to test some networking software that we are developing between two ...
0
votes
4answers
3k views

Connect to the internet with CENTOS 5

I changed my IP to static IP and I no more have access to the internet on my CENTOS 5 server. Oddly you can see the webpage that I am hosting on the server if you navigate to it from another computer ...
0
votes
3answers
112 views

Backup Internet Providers?

One of my clients who has multiple sites has some reliablity issues with their AT&T T1s. At one locations they're using Business Only Broadband, a backup microwave internet link. However, it's ...
-1
votes
2answers
6k views

How to get internet access in a Windows 7 virtual machine [closed]

I am running Windows 7 Ultimate and have now set up two virtual machines in Virtual PC. One is the XP Mode machine which runs XP (obviously). When I set it's network connection to Shared Networking ...