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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What is the purpose of the “Network IP address”, why can it not normally be used? [duplicate]

Possible Duplicate: Is X.Y.Z.0 a valid IP address? Maybe a noob question but when referring to IP subnets, what is the purpose of a network IP. i.e. with a network like 192.168.1.0/24, you ...
2
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1answer
142 views

SPF from neutral to positive

I need to be able to configure SPF rule for my domain. Problem is that I can normally receive all the emails. But when I send to some recipients they receive it as spam. In the mail failure delivery ...
-1
votes
1answer
75 views

APACHE httpd.conf error

I have recently installed the latest Apache. It is working fine through localhost:80 and through 10.0.0.51:80, but I can't connect through [External IP]:80. I have forwarded ports correctly, but I ...
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1answer
46 views

2 connections from same ISP however only 1 can open the site?

I am having a very weird problem, this is the situation: Company A have Internet from provider A Company B have Internet from provider A Company A cannot open site Y or ping Company B can open ...
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2answers
98 views

OID (directory service) Installation and configuration on Windows 2003 R2

I need your help in installing and configuring Oracle Internet Directory service on Windows 2003 R2 server machine, I was wondering if anyone can provide any useful tutorial links on the same. I did ...
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1answer
139 views

Diagnosing WAN performance & peering issues without a second ISP uplink as a comparison?

Background: I am able to access Twitter & Serverfault from work (using Level3) with no problems. However when I use RCN I get crummy service and am not able to load the page. Page reloads ...
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2answers
106 views

I can't connect to internet via lan cable because 2032 battery died and my bios bios info is now empty [closed]

I have a compaq CQ61-112SL from about 5 years now... the main battery is almost dead, doesn't keep more then 10 minutes. anyway my problem is that my motherboard battery didn't have any more energy ...
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1answer
92 views

Is setting up BIND DNS required for making server accessible from internet

I have installed CentOS-6 server in our DMZ. I have a public IP address which I will use for it. Now, how should I set up its DNS in order to make it accessible from internet? Is there any particular ...
5
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2answers
142 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 ...
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votes
1answer
80 views

Design network with redundancy [closed]

I need to build a redundant solution for my company. The idea is to have internet provided by two different ISP in order that if one link goes down the other link will take over. This should be done ...
-4
votes
2answers
488 views

How does an ISP find a server using it's IP address? [closed]

So basically my question is fairly straightforward (and I apologize if this is a duplicate question): how does my ISP find and connect to a server using just that servers IP address? I understand ...
2
votes
1answer
227 views

Intermittent internet access on a flat network - Router is connected [closed]

I’m looking for some help with network settings. I’ve just started a new job (non-IT!) and we have problems with our office network. I’m the most IT literate in the organisation (15 permanent ...
3
votes
1answer
631 views

BGP path prepended route not listed anywhere

We have a simple multi-homed setup with two routers that advertise our AS to two ISP. The second ISP (ISP B) is only used for backup when ISP A goes down, so we prepended our AS 3 times on this route. ...
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1answer
260 views

Ports to open in firewall in case of clients getting to a proxy

I have an internal network inside my LAN. The clients are connected via router to the main LAN. In the main LAN there is a connection to internet. I set up a proxy in the main LAN and connected the ...
0
votes
2answers
235 views

How to authenticate to web based firewall?

I'm new to ubuntu server and I'm trying to figure this out. I have a server install of ubuntu 12.04 behind a fortigate firewall. To get internet access I have to authenticate with the the fortigate ...
4
votes
3answers
378 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 ...
0
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1answer
199 views

Provide Internet access for different VLAN

I have several managed switches at work that connect all computer within our office to the ADSL modem. However I would like enforce a VLAN policy to isolate traffic within the network. Through my ...
1
vote
1answer
122 views

Slow internet connection for no reason

We have a cable internet connection. I've called the company when this happens and they say there's been no downtime on the modem and the signal is strong and there's no fixing or outages in the area. ...
0
votes
1answer
266 views

ping OK, nslookup OK, wget locally OK, remote HTTP false

I'm trying to access http://domain.com/test.html from internet, but getting error Server is running CentOS I'm using DSN hosting (yandex.ru) for domain.com Ping server by ip = OK Ping server by ...
2
votes
0answers
46 views

How normal are remote connection faults and what do they mean? [closed]

Quick background: I have been having a lot of connection issues with my home network. I finally got my ISP to understand and after them checking some of the problems outside of my home I've gone from ...
2
votes
4answers
698 views

Mounting a file system over the internet

I built a web application that runs on a virtual server for one of my customers. It includes the facility for them to upload files, but they now want to store those files on a server in their office. ...
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 ...
1
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1answer
63 views

Tool for creating networks configuration on real machines or VM ? simulating internet networking [closed]

I'm looking for a tool that can simulate and create networks with different machines , kind of intranet , tool for creating networks configuration on real or VM ? Thanks
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3answers
188 views

How to become an ISP [closed]

well cutting to the point... I want to be able to provide internet to rural areas of my country so they can too gain acces to internet for free. I was wondering what I need to start small, like ...
1
vote
1answer
77 views

Rsync through the internet

I'm looking for a way to copy files from production server to DRP server via internet. The two servers are in different states. For now, there isn't a lot of data to transfer but I suspect it might go ...
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votes
2answers
132 views

Bandwidth and Speed monitoring software [closed]

I am looking to get some advice on what you guys think would be a good fit for my requirements. My goal is to find software which would monitor internet speed (UP/DOWN), ping times and more(possibly) ...
4
votes
3answers
486 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 ...
10
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2answers
275 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 ...
6
votes
7answers
992 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 ...
0
votes
1answer
592 views

One Windows Domain workstation can ping gateway but gets no internet access

One of the (Windows XP SP3) workstations of our Windows Domain could not access internet anymore, this problem suddenly happened overnight. The domain controllers (there are three of them) are all ...
0
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2answers
573 views

PCs with Wired Connection Keep Losing Internet Connectivity

I have a U-verse ATT DSL Internet at our church building. Recently, any computer that is plugged into the network via Ethernet keeps losing its internet connectivity. The setup is from the Modem to a ...
1
vote
2answers
283 views

How can I use a backup internet circuit for incoming services/applications?

Current: Primary ISP - fiber Backup ISP - DSL We have various apps/services like VPN, email, etc. that come in on various external IPs on the primary ISP. Is there a way without BGP peering to ...
1
vote
1answer
73 views

Internet Sharing solution

I have a client that is a business. The people at this business are not in anyway computer savvy. I was asked to make a file server for them. This server will need to have four shares with a ...
2
votes
2answers
59 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.
4
votes
2answers
173 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 ...
1
vote
4answers
173 views

Acceptable use policy / computer use policy / network use policy - why are they needed?

I've always posted a(n) acceptable/computer/network use policy for employees using a network/computer or from users coming in from the outside to use public access points or public computers. Private ...
3
votes
2answers
251 views

Is it just me or is my node down?

I find the www.doj.me very useful. I am looking for something like that but specifically for BGP Nodes. I want to write a script that tells the users if our Internet backbone is down, if if yes which ...
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votes
1answer
374 views

Server can't connect to the internet

I have a headless file server running debian that just stopped connecting to the internet. Console output: Dmesg: [ 84.248344] ADDRCONF(NETDEV_UP): eth0: link is not ready [ 85.941389] svc: ...
8
votes
1answer
10k 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 ...
1
vote
2answers
113 views

Root DNS Servers

I understand the root DNS servers (A to M). What I don't exactly get it is the difference between, let's say the "F Root DNS" and the "A Root DNS". Why is there 49 total "F" DNS's and only "A" DNS's? ...
0
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2answers
780 views

Use number of downloaded file in wget as variable in bash script

Can I get the number of downloaded files with wget -r and use that as a variable? I want to write a script that runs multiple wget commands in it (using -q so i can control output) and then at the ...
3
votes
3answers
9k 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 ...
0
votes
2answers
3k views

Internet traffic when connected to a SonicWALL VPN

We have a new VPN to let all users connect to the company's applications through it (inside the company net). We have a lot of users using the SonicWALL Client and we want to allow them using ...
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 ...
0
votes
1answer
142 views

Bridging DSL wifi router to a PacketCable modem [closed]

I used to use a DSL based Internet connection (an AirLive WT-2000ARM). Recently I changed my Internet connection and it is now provided through PacketCable. The provider gave a modem for it (Thomson ...
4
votes
2answers
478 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 ...
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votes
1answer
182 views

not reachable from within my own network through outside facing interface

Is there any quick answer that lapses me by to this situation - my server is accssible at 192.168.2.200:5222 without a problem (from within the local network of course) but if I try to reach it ...
0
votes
2answers
1k views

Computer running Win7 won't access websites but can ping them

First off, pardon me if this is not where I should ask IT questions. If there is another StackExchange site (or site in general) that I should go to by all means let me know. The Problem: One of our ...
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votes
1answer
619 views

Is it possible to access Alfresco CIFS through Internet?

I know it's a security issue, but just by curiosity (I can't find a proper answer to that!), is it possible? I defined cifs.broadcast=255.255.255.255 in the Alfresco configuration, but whatever I ...
0
votes
1answer
674 views

How to connect to hyperv guest machine by rdp through internet?

I installed hyperv and some client machines. Now i need to connect to any of client machine and host by using rdp through internet. This instruction tell me what i need to configure port forwarding on ...