Networking is the art of connecting two or more devices together so that they can communicate with each other.

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32
votes
2answers
24k views

How to launch a command on network connection/disconnection?

I have a wifi connection that requires to authenticate using a web form once the wireless link is established. I know how to automate the authentication with a script that uses curl/curlIE. But how ...
31
votes
10answers
24k views

Can I make two wireless routers communicate using the wireless?

I want to make a setup like this: cable modem <-cable-> wireless router 1 <-wireless-> wireless router 2 in another room <-cables-> PCs in another room Basically, I want to extend my ...
31
votes
1answer
3k views

What happens to TCP connections when I remove the ethernet cable?

For a TCP connection, when I remove the cable and reconnect after 30-40 seconds there is no packet loss issues. But when the reconnect time is more than a few minutes all the packets are lost. I know ...
30
votes
6answers
65k views

What is a subnet mask, and the difference between a subnet mask of 255.255.255.0 and 255.0.0.0?

My DSL/WiFi router provided by my ISP has an internal IP address of 10.0.0.138, the addresses provided by DHCP are in the format of 10.0.0.xxx. Now, I want to start using static IP addresses on my ...
30
votes
3answers
9k views

Use a smartphone as a Dial Up Modem?

Most cellphones today have an audio jack that works as both output and input for sound. That's why there's headphones today with built in microphones for making phone calls. Now then, is it possible, ...
30
votes
5answers
12k views

How do I physically find a wifi device using a laptop or mobile phone

Okay, so I have lost my tablet somewhere in my flat and have been searching for hours already. It is an Android device, which seems to have wifi enabled (responds to pings), but doesn't seem to react ...
30
votes
1answer
25k views

Mac Wireshark alternatives [closed]

Do you know any good alternatives for wireshark (network analyzer) running on a Mac OS X 10.5+? Wireshark is not that handy like on an Windows OS (user interface with X11, ...). Any kind of help is ...
29
votes
3answers
17k views

How to go to remote directory in Cygwin?

I'm using the latest version of Cygwin to try to cd into a network drive on Windows XP Pro Service Pack 3. The path in Windows Explorer to this directory is something like: \\myserver\photos\original ...
29
votes
2answers
12k views

Are MAC addresses unique when coming out of the factory?

According to Wikipedia: A Media Access Control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment But how unique are ...
29
votes
5answers
3k views

How do I tell Windows to use 802.11 in preference to 3G?

I have a Samsung NC-10 netbook which I take to work every day. Most of the time I use it just on the train/bus, but I also use it at work and home. It has a built-in 3G card which I want to use when ...
28
votes
10answers
12k views

Application for monitoring all applications that are using the internet in Mac OS X

Can anyone introduce me a Mac OS X application that monitors all network activity such as what applications are now connected to the internet and how much bandwidth they use (I mean show bandwidth ...
28
votes
4answers
16k views

How do CDN (Content Distribution Networks) work?

Taking Akamai as CDN. From what I understand, when a client requests a page, the request goes to Akamai central server, which then depending on the location of client, picks up an Akamai edge server ...
27
votes
3answers
90k views

What's the difference between RDP vs VNC?

Okay I was playing around with the iPhone Jaadu App and I realized I download the wrong desktop client. So what's really the difference between the RDP and VNC? (because there is Jaadu RDP and Jaadu ...
27
votes
10answers
3k views

Does speed enhancement software actually work? [duplicate]

Here on the Internet, we see many ads promoting software products which can enhance your Internet speed. I wonder, how could this be? Imagine that you are using a 1 Mbps Internet connection, and the ...
27
votes
12answers
117k views

Windows 7 intermittently drops wired Internet/LAN connection

In a nutshell, my Windows 7 Ultimate PC intermittently drops its Internet connection. Why? Background: My PC is wired to my ADSL modem/router which is directly connected to the phone line. I also ...
27
votes
3answers
23k views

Difference between host name and domain name

What's the difference between Hostname and Domain name? especially in regards to NIC Could someone please elaborate with examples as this concept is a little confusing
27
votes
7answers
26k views

Force an application to use a specific network interface

I'm using multiple network interfaces (LAN and Wireless), and I've noticed that there's a way to change the order of prefered interfaces. How can I use the wired network to do work, check email, and ...
26
votes
3answers
3k views

Do text based browsers reduce network traffic?

Do text based browsers such as lynx, links and elinks consume less bandwidth than a GUI based browser (ie, Firefox, Chrome etc.)? I'm guessing no reduction in traffic. Rationale: I think a text based ...
25
votes
5answers
2k views

What gets uploaded when I surf the web?

I am using a modem, and it shows a download speed of n kbps and an upload speed of m kbps. When I check its logs, it shows the amount of data downloaded and uploaded. I'm wondering why it shows that ...
25
votes
14answers
17k views

IP Address vs MAC addresses

why do we need ip addresses if mac address is enough to identify the machine???
25
votes
4answers
2k views

Two Routers are fighting each other on LAN

My apartment is quite large and most rooms have several walls, meaning Wifi signals drop easily. To combat this I found a spare DSL Router I had previously and placed that in the Kitchen and ...
25
votes
2answers
63k views

clear IP address of Ethernet interface

What is the Linux command to clear IP address of an interface without bringing it down and/or restarting network services. Seems strange ifconfig is able to change IP address but has no option to ...
25
votes
4answers
101k views

Permanently map a network drive on Mac OS X Leopard

I want to have a mapped drive in Mac OS X which points to my NAS - however I've found that I have to do it after every single reboot. I'm a Mac noob, so would like to just have the drive mapped at ...
25
votes
7answers
19k views

Parallelizing rsync

I just moved and discovered after some trial and error that somewhere between my home and my remote server, there is some throttling going on...but the throttling is not very intelligent. It only ...
24
votes
9answers
3k views

How to identify from a Windows computer the wireless device that is poisoning router?

I live in a house with various other people who all swear that there is nothing wrong with any of their devices. The problem being is that when wireless is enabled on the router, ping sky-rockets and ...
24
votes
4answers
4k views

How does HTTP become stateless?

HTTP is said to be stateless. Meaning, it doesn’t need to store information for the transmission of data. But HTTP uses TCP, which is state oriented. If that's the case, how does HTTP becomes ...
24
votes
5answers
9k views

Are Domain Name Server and Name Server the same thing?

I am slightly confused between DNS and Name server. Are they the same thing or is there a difference between two?
24
votes
9answers
6k views

How to track LAN usage? (AKA 'top for LAN')

There's an evil application that is eating ALL my upload bandwidth (I'm brazilian, it's only ~35kbps) for like 80% of the time my PC is turned on. I would like to know if there's any way to track ...
24
votes
2answers
19k views

How can I monitor network usage by process on Mac OS X? [duplicate]

Possible Duplicate: Application for monitoring all applications that are using the internet in Mac OS X Bandwidth monitor for Mac OS X? Is there any way to find out which process using how ...
23
votes
9answers
121k views

How can I ping a range of IP addresses simultaneously

I have a bunch of machines on an IP address range which I want to ping simultaneously as a quick and dirty way of telling which ones are switched on. What (free) software can I use to do this? I'm ...
23
votes
5answers
4k views

Can my landlord access my personal network because he controls the upstream connection?

Can my landlord access the things on my personal router's network because he controls the upstream connection? For example: the DLNA on my NAS, a public file share on my NAS, or the media server ...
23
votes
7answers
69k views

How to force Windows 7 to ask for a “fresh” IP address from DHCP server?

I'm troubleshooting a certain issue with my DHCP configuration, and need my Windows machine to ask for a "fresh" IP address, so I can see which address DHCP server gives by default. When I do ...
22
votes
8answers
4k views

What are the disadvantages (if any) of accessing the internet through two or more “chained” routers?

My Problem I just got internet setup in my dorm room at school through a third-party provider. The modem they gave me, however, also functions as a wireless router. I also have my own router with ...
22
votes
7answers
40k views

Why can I ping an IP address but not 'traceroute' it?

I can ping an IP address, but I can't traceroute it. How could this be? [USERNAME@HOSTNAME ~]$ ping CENSORED.CENSORED PING CENSORED.CENSORED (CENSORED) 56(84) bytes of data. 64 bytes from ...
22
votes
4answers
15k views

What is VPN actually used for?

I've never really understood why VPNs are used. I know it stands for Virtual Private Network, but in simple terms how does it work and what is it used for?
22
votes
2answers
168k views

Is there a PC equivalent for the Android 'Wifi Analyzer' App? [closed]

I'm using the Wifi Analyzer app on my phone a lot at the moment as I need to set up and test some wireless networks. For people unfamiliar with the app, i've posted some screenshots of the app that I ...
22
votes
2answers
5k views

How do I check the internet usage of a particular device in my room?

I am living with 5 other people and most of our network is consumed in 20 days so we have to spend almost 10-11 days without Internet. I just wish to know what are the ways to monitor the internet ...
22
votes
3answers
30k views

What is the relevance of “fe80::1%lo0 localhost” in /etc/hosts?

Following are the entries in my /etc/hosts. I was wondering what is the last entry (fe80::1%lo0 localhost) for. 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost ...
22
votes
1answer
10k views

Looking for a fiber optic “switch” or “router” for home use

The gist of my question: What is a "fiber optic" switch called? I.E. a layer 2 ethernet switch that uses fiber TX and RX connections and sends layer 2 network traffic between the fiber strands ...
21
votes
8answers
91k views

How can I monitor internet usage in my network?

I need to know which computer is consuming my bandwidth. Is there a tool to do this?
21
votes
12answers
9k views

Running cat5 cable outdoors

I'm trying to extend my network to an unconnected garage that's about 20 yards away from my house. What's the best way to do this? Is there special outdoor-rated cat5e/cat6 I should use? If put it ...
21
votes
3answers
53k views

Is there a good DNS server I can install on Windows 7 for a LAN? [closed]

I have a few computers on my LAN, and now I'm getting tired of remembering the IP addresses all the time, so I would like to start using DNS names on my LAN. I have a heterogeneous network with ...
20
votes
8answers
126k views

How to find the MAC address of a remote computer?

I know the IP address of a host on my own LAN. Using that, how can I find its MAC address (without having to physically access it)?
20
votes
3answers
215k views

What is the Teredo Tunneling Pseudo-Interface?

I am running Windows 7 Ultimate, and when I do ipconfig /all in the command prompt I get, in addition to the Ethernet adapter Local Area Connection that I expected, something called Tunnel adapter ...
20
votes
7answers
63k views

Find an unknown static IP + subnet mask of device?

I have a device set with a static IP and subnet mask. I do not know the IP or subnet mask. How can I find the devices IP and subnet mask? It is a piece of hardware, not a PC. It will not take an IP ...
20
votes
8answers
15k views

How can I join two simple home networks together using an ethernet cable?

I want to join two different home networks together like so: PC A1 PC A2 PC B1 PC B2 \ / \ / Gateway A ...
20
votes
2answers
27k views

Do different positions of the antenna on a wireless router make any difference?

Often, the antenna of a wireless router can be moved in many directions. Does it make a difference as to which way it points? Should it point toward the device(s) using it? Should multiple antennas ...
19
votes
5answers
44k views

Display list of computers on a LAN in Linux

I'm a web dev who is trying to get a better handle on security. I'm trying to figure out a way (on Linux/Debian based distros) to list all computers on the same LAN my netbook is on. I tried "arp -n" ...
19
votes
13answers
16k views

Visual Network Topology Map?

If I have no idea of the current network setup, and I'm connected to the LAN - is there any GUI that could possibly identify nodes visually or give me any sort of insight? I'm looking for a more ...
19
votes
2answers
7k views

How do you get loopback addresses other than 127.0.0.1 to work on OS X

According to everything I read, the entire 127.x.x.x subnet should loopback. However, on my Mac, I can only ping 127.0.0.1 I know I've done this before (though possibly on another OS) and has come ...