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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Monitoring Maximum Process Network Activity

We have a collocated server on which we run some OpenVZ hosts. Recently, we have had to pay a lot extra we keep exceeding our bandwidth quota. Our quota is 5 Mb/s but we have spike to almost 50. I ...
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1answer
713 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 ...
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4answers
4k views

How to throttle your own internet connection?

I am writing a website and want to test it's speed on slower internet connections. I have the unfortunate first world problem of downloading at 100mbps, how can I throttle my own computer's internet ...
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2answers
916 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 ...
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1answer
150 views

LAN full of public ipv4 addresses - How to filter it?

The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP ...
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2answers
375 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 ...
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1answer
77 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 ...
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2answers
103 views

Redmine without e-mail functionality

I want to install Redmine on an air-gapped network. It has no connection to the internet or any other network. As it doesn't need an e-mail server, it doesn't have that either. My question is, can ...
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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.
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2answers
186 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 ...
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1answer
330 views

Getting internet access from remote host through VPN like you are a VPN's LAN client

On my server(CentOS 6.2), I have installed CoovaChilli* software. Bellow, I will present what I need to do, and put my questions: My LAN that is managed by server is 10.1.0.0. The Internet IP address ...
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1answer
111 views

ARP issues across MAN

We have a large area MAN provided by a local cable company. Each location has a cable modem that connects directly back to a central location, i.e. it doesn't cross the internet, it is a private ...
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4answers
175 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 ...
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2answers
269 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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1answer
450 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
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1answer
14k 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 ...
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2answers
116 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? ...
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2answers
114 views

Can an internet connection be more robust when connecting through a VPN?

During live streams some viewers experiencing problems with the stream like dropouts and artifacts although they have a 100MBit line what makes me assume the problems are caused by packet loss. ...
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2answers
892 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 ...
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3answers
14k 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 ...
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2answers
5k 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 ...
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1answer
316 views

display internet usage agreement before users can use internet

I was looking for a way to display a usage agreement page in browsers that users must agree to before they are allowed to access the internet. This would be for users on public computers and ...
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1answer
65 views

Port Mapping in Windows Server

I have Windows Server 2003 and in WS virtual machine with Ubuntu server. Network: On host I have eth0 with real IP, virtual eth (192.168.0.1 - virtualbox interface), it's working in bridge mode with ...
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2answers
1k views

Proxy Settings per Machine not working on windows server 2008 R2 SP1

i have a very interesting problem and would appreciate any help for it. In my scenario i have scripts which bring up a VM inside a domain. Now i want to enable internet access for all the VM's and ...
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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 ...
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2answers
3k 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 ...
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1answer
151 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
511 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
205 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 ...
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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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1answer
758 views

Iptables Webserver Connection Timeout

After setting up iptables. My webserver has "connection timed out". I'm trying to setup my iptables based on what I have read is a pretty good starting point for a web server from another ...
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1answer
719 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 ...
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1answer
809 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 ...
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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 ...
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1answer
171 views

Ubuntu - New Ubuntu server won't accept new public IP

I'm currently setting up the servers and since I gave server HachiSoftware02 it's public IP it won't let me connect to it via SSH. When it had a local IP it worked fine and I need the server for ...
2
votes
3answers
648 views

On CentOS 4.5, How to Masquerade a connection using MAC address?

Currently we give Internet access using ip address in our firewall script as follows iptables -t nat -A POSTROUNTING -s 192.168.1.40 -j MASQUERADE But we have noticed that some guys steal these ...
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1answer
756 views

netstat -e: high discards and errors

I think my network is congested because of the relatively large discards and errors data. They should be zero or at least close to that. Here is the output of netstat -e on my computer: Interface ...
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1answer
292 views

What is the difference between a leased line and EFM?

I am ordering a new internet connection in the United Kingdom and wondered what's the difference between: 10mb leased line 10mb EFM (Ethernet First Mile) line They both seem to offer equal ...
3
votes
3answers
6k views

How to configure bind9 to be a local DNS only with no internet access?

I want to configure bind9 to be a local DNS only with no internet access at all. So I have 5 PCs in my virtual domain xy.com. Within this domain there is no access to the internet. The DNS server ...
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1answer
439 views

How do I get VirtualBox to use my Windows 7 host machine as a gateway? [closed]

I can't seem to find the answer to this. I have a Windows 7 (64bit) machine that is a company laptop. Company policy is very strict about adding machines to the network. I need to run a Linux ...
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1answer
169 views

If linux server is connected to router, internet connection for the whole network will not work

I have a machine (Fedora) which is using iptables (acting as firewall). The system worked a long time, but now there is a problem. The internet connection was failing. I looked through and found out ...
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1answer
841 views

How do I access a web server on a VirtualBox from the internet? [closed]

Scheme: Direct Internet connection with static IP (upd: connected directly to the ISP without any routers). Win Web Server (Win 2008 R2). VirtualBox with guest OS Linux Debian. Web-server on Debian. ...
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1answer
160 views

Determining Internet Backbones from ASN

I am new to this layer of networking so I apologize if this question is a bit strange. When running a traceroute, I get the up addresses of the route it takes. Now, I take these addresses and map ...
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votes
1answer
2k views

How to get Comcast to stop blocking me? [closed]

I am a web developer running a demo server at home. My site is accessible from Atlanta as well as via my local cellular network. However, both a webserver I have in Utah and a webserver of a service ...
9
votes
1answer
10k 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 ...
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2answers
769 views

Trying to host my own domain, using BIND and CentOS 6. Please check my named.conf and zone for errors

delegated the namesever/ip records around 24 hours on the registars website but things aren't working. NAT: forwarding all UDP/TCP requests to internal server IP on port 53 (ISP not blocking) and ...
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2answers
70 views

Trying to grasp the logic behind a complete DNS resolution and respective sequence of actions

Say we have a domain "example.org" and it has an authoritative name server with name "ns1.example.org" with a glued IP as delegated by domain registrars (delegative?) name servers. Someone types ...
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1answer
89 views

Can someone explain to me exactly why it's bad to use NS name that is a subdomain for the domain that NS is for

Reading a book and it states that you should not register nameserver names such as ns1.example.com for the domain example.com as you'll create a catch-22 situation when looking up ns1.example.com etc. ...
2
votes
1answer
127 views

Load balancing multiple internet connections

I've got the following scenario: - one low speed and low latency DSL connection (cable) (250kb/s 25ms) - one high speed and high latency DSl connection (satellite) (1250kb/s ~1500ms) Is there a ...
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, ...