For questions on connecting devices together so that they can communicate with each other, as well as on networking equipment such as routers and switches.

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39
votes
2answers
30k 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 ...
39
votes
5answers
21k views

How to use different network interfaces for different processes?

I have two network interfaces on a Linux PC, and I need to manually set the interface that a given process will use. The program (Twinkle softphone) does not have a similar option, so I believe that ...
38
votes
5answers
2k views

What keeps you from changing your public IP address and wreaking havok?

An interesting question was asked of me and I did not know what to answer. So I'll ask here. Let's say I subscribed to an ISP and I'm using cable internet access. The ISP gives me a public IP address ...
37
votes
7answers
5k views

Why am I getting 950 Mbps up but only 360 Mbps down on Gigabit Ethernet?

I got two desktop computers talking to each other directly. They both have Gigabit Ethernet capable network adapters. That's 1 Gbps or 1000 Mbps. I have them connected with a brand new 10 meter long ...
36
votes
3answers
21k 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 ...
35
votes
4answers
42k views

Can admins monitor my activity locally even when I use a VPN?

My school has one of those super overreacting web blockers (specifically Fortisnet) that blocks things that should be accessible by a high-school senior trying to research projects. Despite many ...
34
votes
5answers
3k views

What stops an internet router from sniffing my traffic?

Packets travel through internetworks, and take many routes through internet routers. On each route that forwards traffic to another until reaching the ultimate destination, what stops them from ...
34
votes
1answer
3k views

65536 +1 Connection on a system

There are 65536 ports for every system in the network, and every connection or Send/Receive will use one of those. My question is: what happens if we have 65536+1 connections?! I know that it ...
33
votes
2answers
87k views

How can I clear the IP address of Ethernet interface without cycling the interface up/down or restarting it

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 ...
32
votes
10answers
25k 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 ...
32
votes
2answers
14k 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 ...
32
votes
3answers
16k 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, ...
32
votes
1answer
29k 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 ...
31
votes
3answers
104k views

What's the difference between RDP vs VNC?

What's really the difference between the RDP and VNC? They both provide the same function and features?
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 ...
31
votes
3answers
31k 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
31
votes
5answers
16k 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
6answers
82k 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
12answers
135k 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 ...
30
votes
5answers
18k 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 ...
30
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 ...
29
votes
10answers
13k 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
9answers
161k 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 ...
28
votes
5answers
12k 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?
28
votes
7answers
32k 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 ...
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
7answers
106k 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 ...
27
votes
7answers
22k 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 ...
27
votes
2answers
54k views

How to share any folder without password in Windows 8/10 in a home network if a Microsoft account is involved?

My question is: How to set up file sharing correctly, in a home network, with Windows 8/10, so sharing any folder with "Everyone" (File Explorer->Right click on ...
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 ...
26
votes
5answers
70k 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" ...
26
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 ...
26
votes
3answers
256k 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 ...
26
votes
3answers
36k 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 ...
25
votes
4answers
4k views

Why does the “Internet of Things” enforce the need for IPv6 addresses?

If you have multiple devices in one network, the amount of IPv4 addresses will not increase linearly to accomodate the number of devices. There is just one IPv4 address per Network/Router that is ...
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
6answers
63k views

Why does just splitting an Ethernet cable not work?

I thought the Ethernet is logically a one-line communication bus (for argument's sake, I am excluding hubs). All machines attached on the bus hears the same signals and the machines themselves try to ...
25
votes
14answers
18k views

IP Address vs MAC addresses

why do we need ip addresses if mac address is enough to identify the machine???
25
votes
7answers
53k 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 ...
25
votes
4answers
4k 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
42k views

What is the difference between NAT / Bridged / Host-Only networking?

VMWare: What is NAT vs. Bridged vs. Host-Only?
25
votes
2answers
163k views

Difference between Ethernet splitter and switch

I have one Ethernet port that is wired directly to the router on another level. However, I want to run a desktop and a server both off this one Ethernet port. Can anyone tell me the difference ...
25
votes
2answers
65k views

What is Windows command to convert machine name to ip address and vice versa?

I need to know the ip address of another machine in a lan network. What is the Windows command for getting ip address from machine name and vice versa?
25
votes
4answers
115k 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 ...
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
2answers
181k 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 ...
24
votes
2answers
23k 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 ...
24
votes
1answer
17k 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 ...
23
votes
5answers
5k 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 ...