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

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How to detect the speed (fast or gigabit ethernet) of a network connection over Windows command line

To troubleshoot a network problem I would like to inquire the real network "speed" for a given network adapter, which can be seen when opening the "status" of a network connection under Windows: ...
14
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7answers
22k views

Are there netcat-like tools for Windows which are not quarantined as malware?

I used to use netcat for Windows to help track down network connectivity issues. However these days my anti-virus software (Symantec - but I understand others display similar behaviour) quarantines ...
14
votes
4answers
13k views

Change VirtualBox DHCP to issue 192.168.x.x adresses instead of 10.0.x.x adresses?

I have a VirtualBox (v4.1.8) VM that is automatically assigned with an IP in the 10.0.x.x range via DHCP. Can I change it to use the 192.168.x.x range instead?
14
votes
1answer
2k views

What kind of IP address is this? (WIN-F9PTTKUMI2U:29901)

While downloading a file with μTorrent, I noticed a strange peer with an address that was not an IPv4 or IPv6 address. μTorrent showed it as WIN-F9PTTKUMI2U:29901. What kind of address is this?
14
votes
1answer
577 views

How come sites like Google/Facebook/etc. don't get DDOS'd even though they receive so many requests?

Something I don't understand: (Tens/hundreds of?) thousands of people simultaneously try to connect to a site like facebook.com or google.com. From what I understand, they must all necessarily ...
14
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3answers
28k views

How to disable autoconfiguration on IPv6 in Linux?

How can I permanently disable autoconfiguration of IPv6 in Linux? When I try to manually delete an address from an interface with: ip -6 addr del 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64 dev eth1 ...
14
votes
2answers
13k views

How to get VirtualBox VMs to use host's DNS?

I use VirtualBox for my VMs. My office network setup is wireless, i.e. I connect to my company's WiFi network, which has a local DNS to resolve local names (such as something.mycompany.com going to ...
14
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3answers
24k views

How do I set the priority of network connections in Ubuntu?

If a Ubuntu 11.04 machine is connected to WiFi and 3G simultaneously, how do I set the priority to let the applications (browser etc.) to use WiFi first? If that's not available, it should use the ...
14
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1answer
51k views

Tunnel adapters on ipconfig?

Hello I recently noticed unusual information in my IPCONFIG. Usually I only see Ethernet adapter Local Area Connection, but now I see Tunnel adapter isatap... and Tunnel adapter Teredo... I was ...
14
votes
3answers
39k views

Windows 7 - Cached Network Share Credentials?

I have an issue in Windows 7 where I get the following error message when attempting to access an admin network share on a machine in another domain: Multiple connections to a server or shared ...
14
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5answers
39k views

how does 'ping' command really work?

How does the ping command really work? Specifically where does the ARP (Address Resolution Protocol) come into picture? I was asked this question in an interview and I was not able to come up with ...
13
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14answers
46k views

What's the fastest way to transfer files between 2 computers? [closed]

Let's say that I have 80Gb of data to transfer from one computer to another. What's the fastest method to transfer that files? Network transfer? DVD Recording? Copying in a pen drive? Removing one ...
13
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9answers
60k views

Are routers limited to number of devices?

I'm going to buy a new router, but, I've just realised that for nearly all routers I've looked at (Belkin, Netgear, D-Link) don't state the maximum number of devices which can connect concurrently. ...
13
votes
9answers
3k views

Why are Ethernet/MAC addresses needed?

I don't understand why Ethernet MAC addresses are needed. Can't all computers just be connected to the unified network and use IP addresses to communicate? For example, there is a following mechanism ...
13
votes
7answers
8k views

Disable WLan if Wired/Cable Network is available

The question says it all. All i want is that my W-Lan connection should be disabled whenever a wired connection is available. What would be the easiest way to do that in Ubuntu/Gnome? In all guides ...
13
votes
4answers
36k views

How to increase Remote Desktop resolution?

I'm using Windows 7 on a PC and connect to it via Remote Desktop Connection for Mac by MS, using a Mac. On the Mac, I have a 27" Display with 2560 x 1440 px resolution. The PC has a high performance ...
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5answers
2k views

Identify an unknown IP in our network

I have a network containing 20 clients. I assigned IP range 10.0.0.1 to 10.0.0.20 to them. When I do an IP scanning I see someone using 10.0.0.131 in VMware. How can I find out which IP is this IP ...
13
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2answers
1k views

If two devices are emitting a wifi signal in the same frequency at the same time and reach an antenna at the same time, how can the data not overlap?

I mean, I know each packet is sent with a MAC address, but what about streaming? What happen if while the router is receiving one packet, a packet from another device arrives? How can the router ...
13
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3answers
15k views

500 Mbit/s powerline network, only 3.5 Mbyte/s transfer speed?

I have a TP-Link 500 Mbit/s Gigabit Powerline Adapter linking two computers (one Windows Vista and one Windows 7) in different rooms in the house. As in: Computer <-Ethernet ...
13
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3answers
5k views

Will multiple switches slow transfer speed

I want to create link between a data server (It's more like NAS) and around 300 computers. Data transferred per day is around 2GB/computer and speed really matters. If I use a single switch it would ...
13
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7answers
30k views

Getting a VMnet0 error in VMWare workstation after updating host computer from Windows 8 to 8.1

Yesterday, I updated my computer from Windows 8 to 8.1. I have VMWare Workstation 10 running Windows XP on this computer and prior to the update I had no issues connecting to my network. However, ...
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3answers
16k views

How to give preference over one network connection over another?

Like most laptops, it has both both ethernet and wireless networking options. Likewise, I have a wireless router with 10/100/1000 Mbs. 90% of the time, wireless speeds suffice. But once in a while, ...
13
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4answers
4k views

Negative ping time?

This is the first time I've seen this and I'm not sure what it means; 64 bytes from 74.125.93.99: icmp_seq=6233 ttl=53 time=545.493 ms 64 bytes from 74.125.93.99: icmp_seq=6234 ttl=53 time=776.093 ...
13
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2answers
25k views

How to delete a VPN connection in Windows 8?

How do i delete a VPN connection in Windows 8? In Windows 8 i can have VPN connections: How do i delete them? Things i've tried: right-clicking the connection name hold-clicking the ...
13
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7answers
38k views

How to remove permanent map of a network drive on OS X Lion?

Some time ago I mapped a network drive on my Snow Leopard Mac, which was upgraded to Lion. The network drive is not active any more and I receive popups all the time with the error: There was a ...
13
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5answers
23k views

Viewing CHM Files Across The Network in Windows 7

When I try to open .chm help from a network shared drive I receive the following error: Navigation to the webpage was canceled. I know about the .reg solution described on KB896054 ...
13
votes
1answer
209k views

How do I set up Windows 7 to stream media to my PS3?

I have a computer and a PS3 connected wirelessly to my router, but it seems no matter how hard I try I can not get my PC to show up on my PS3. I've also tried setting up a media server with TVersity ...
13
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3answers
979 views

What is IPv6 and why should I care?

What is IPv6 and why should I care? Bonus points for easy instructions for jumping into the bandwagon.
13
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2answers
41k views

Default username/password for accessing network shares in Windows 8?

I always had the same username and password on all my network devices (NAS, desktop PC, laptop) in my small home network. This allows me to access network shares of other devices without having to ...
13
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3answers
113k views

How to remove unwanted tunnel adapter connections?

I did "ipconfig" today and found about 10 network interfaces, most of them disconnected. How can I diagnose this? Where can I remove them? Edit: The extra network appear like this: Tunnel ...
13
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2answers
10k views

Maximum length of Ethernet over CAT5

As part of my course I’ve been reading the paper Ethernet: Distributed Packet Switching for Local Computer Networks. I understand that “classic” Ethernet (over coaxial cable) has a maximum length of ...
13
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2answers
51k views

How to route only specific subnet (source ip) to a particular interface?

How to route only specific subnet (source ip) to a particular interface? OS: Linux I know I can do easily by destination IP by using something like route add 1.2.3.4/24 dev eth4 but I do not ...
13
votes
4answers
12k views

Unable to browse Internet on Mac OS X

I can't reach websites using browsers in OS X 10.6.7 on a MacBook Pro, possibly after resuming from sleep. I've had this problem before and it has been solved by a reboot, but I since I got it again I ...
13
votes
4answers
4k views

Monitoring Bandwidth Across Multiple Systems in a Home Network

For the past several years, I have been using a simple software bandwidth monitor on my computer to keep track of my monthly bandwidth usage. It has worked fine (more or less; the numbers are slightly ...
13
votes
2answers
4k views

How will home networks work in the IPv6 world?

Right now, I have a home network setup behind a Netgear router. That router has a public IP address I get from Comcast. I also have a computer setup on my home network running Linux that runs a DHCP ...
13
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2answers
13k views

How does bridged networking work in Virtualbox?

How does bridged networking work? I have looked through the VirtualBox manuals but nothing extremely technical came up (It was just a generic gloss over of the topic). How does it assign a ...
12
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8answers
4k views

Is it possible to find a printer's physical location in a building by its IP adress?

I am in a school with probably 200+ computers and I did an IP scan among a certain range and found three or four printers. I was wondering if it would be possible to find these printers in the school, ...
12
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5answers
79k views

How to tell what MTU is being used in Windows XP

I'm suffering from a really weird problem where I randomly get "The connection to the server was reset" errors when trying to access web pages (HTTP error 12031 according to the Windows network ...
12
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2answers
172k views

Where to download Juniper Network Connect 7

I have a client that needs to connect to his VPN. He uses Juniper Network connect though he currently doesnt have it installed. I want to install it for him but I unable to download from Junipers ...
12
votes
3answers
27k views

What is a MAC address, and what does it reveal about me?

Does my MAC address list my name, ect? How do I find out exactly what the MAC address tells me? I know it's the "physical address" of my laptop, but what exactly does that mean? This is what my MAC ...
12
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8answers
1k views

Is it possible to merge my ISP and cellphone Internet access? I want to split download and upload [duplicate]

I would like to use my ISP for download only, and my cellphones 4G connection for upload only. This is because my ISP's upload speed is poor, but download is OK, and my 4G upload is great and free (I ...
12
votes
8answers
43k views

How can I make VNC faster?

I need to remotely access and use my work computer a few times a week. I want to use VNC because of the price. I've used VNC before, mostly on my own network, where it's fast. However, VNC over the ...
12
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3answers
2k views

Make it so that multiple devices connected to the same router get their own public IP

I am trying to make my router work in such a way that every device attached to it receives their own unique public IP address, so that any computer would be able to use a direct P2P connection. I ...
12
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3answers
61k views

Why does my Internet slow to a crawl unless I reboot my router every few days?

A few weeks ago, I noticed that my Internet connection had slowed down to a crawl. I waited a few days hoping it would go away on its own, but it didn't get better. So I asked this question about how ...
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6answers
16k views

Merging two incoming broadband lines for faster internet

We have a broadband line coming into our building which delivers around 8-10mbps, which is ok but not great, although fibre is available in our area (30-100mbps) its not available where we are just ...
12
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7answers
12k views

Why is my subnet mask 255.255.255.255?

I have a modem which used for internet broadband and I got an IP address in the 'A' class 10.x.x.x and have netmask 255.255.255.255. What does 255.255.255.255 mean exactly? When I try to sniff with ...
12
votes
3answers
15k views

How to make Windows 7 remember credentials for a Samba network drive?

I have a Samba share on my Ubuntu server which I map as a network drive on my Windows 7 Professional computer. After every reboot it shows the drive as disconnected and to access it I have to renter ...
12
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3answers
38k views

How to use a home network patch panel?

I'm planning a home network in a house that's not built yet. One recommendation is to add network sockets in various rooms and have them all end in a central place, where it all connects using a ...
12
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3answers
12k views

How can I run ALL http request through Charles Web Debugging Proxy - including command line ones?

I'm using the Charles Web Debugging Proxy software to debug HTTP requests. It works great with my desktop browsers, Chrome and Firefox, and it even sees HTTP requests that other programs make. When I ...
12
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5answers
71k views

Missing eth0 Ethernet interface in Ubuntu — can't connect to router

I'm having trouble getting my Ubuntu 10.04 machine (Sony Vaio VGN-SR490) to connect to the Internet by way of an Ethernet cable connected directly to my router. I'm able to connect to the Internet ...