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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15
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7answers
20k views

Ethernet and networking speeds as “500 Mbps Gigabit”?

I am quite confused with networking and speeds and such. I want to buy something so its throwing Google off - if I type in the keywords I just get websites selling the products I want, not information ...
15
votes
3answers
2k 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 ...
15
votes
7answers
35k 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 ...
15
votes
3answers
53k views

What's a loopback-address? I.e. 127.0.0.1

What is a loop-back address? 127.0.0.1 is a loop-back address, but what does this even mean? Please be very descriptive and give an example, as I'm having a hard-time understanding this.
15
votes
8answers
55k views

How can I make VNC faster?

I need to remotely access and use my work computer a few times a week. I'm currently using UltraVNC. I want to use VNC because of the price. I've used VNC before, mostly on my own network, where it's ...
15
votes
5answers
90k 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 ...
15
votes
3answers
2k views

Why does my network file copy speed form a wave?

With the upgrade to Windows 10 I've now got this nice graph when copying files. When I copy a single large file the speed always takes this reasonably consistent wave shape. What causes that? ...
15
votes
4answers
6k 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 ...
15
votes
3answers
35k 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 3G....
15
votes
6answers
16k views

Set Ethernet Network as Metered Connection in Windows 8

Windows 8 introduced a new feature which allows users to set any Wi-Fi network as metered so that they can check their bandwidth usage: [img credit] But, it doesn't allow users to set any Ethernet ...
14
votes
14answers
47k 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 ...
14
votes
5answers
114k 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 ...
14
votes
3answers
802 views

Why is the download speed slow in the early seconds?

When you download a big enough file, you can see that in the early seconds, the download speed increases to finally reach its mean value. Why?
14
votes
5answers
4k views

How do I pre-wire my home right?

This seems like a good place to ask this. I'm sure many of you have done this in the past. I am getting a home built and will soon be making decisions on all the pre-wiring. I know I want to run ...
14
votes
6answers
9k views

Does increasing upload or download speed reduce ping?

I have a 5 MB/s connection, but I always notice high ping when playing online games. When the network is stable (i.e. when pingtest.com reports the connection as 5 MB/s), the ping stays at 50 ms, but ...
14
votes
3answers
207k 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 ...
14
votes
3answers
4k views

How do I ping localhost using IPv6?

I'm trying to understand IPv6 better. Firstly, I try ifconfig, and I get the following: eth0 Link encap:Ethernet HWaddr XXXXXXX inet addr:X.X.X.X Bcast:X.X.X.X Mask:XXXXXXXXX ...
14
votes
10answers
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 ...
14
votes
3answers
35k 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 ...
14
votes
4answers
44k 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 ...
14
votes
5answers
27k views

Samba+Windows: Allow multiple connections by different users?

I have a machine running Ubuntu with Samba that I use to share stuff with my family's Windows machines in our local network. Currently they access a share for movies/music/etc with one user. I want ...
14
votes
4answers
2k views

What would be the disadvantages of using a 4 stranded ethernet cable?

I got this cable with a homeplug AV 200 device - its labelled cat 5e But looking at the plug end has me rather dubious about it. (There's only 4 strands there, not the standard 8 - and missing ...
14
votes
3answers
58k views

How can I change the binding order of network adapters in Windows 7?

The end goal here is that I am trying to install an Oracle 10g server on my Windows 7 x64 dev box. I use DHCP, and the Oracle installer is throwing up this warning: Checking Network Configuration ...
14
votes
2answers
11k views

Should uploading a file on DSL kill the download speed?

I have the 20,127/893 Kbps service through CenturyLink DSL. I've ran speed test and it typically reports speeds close to that. Except whenever I upload something substantial. Like a video file to ...
14
votes
4answers
25k 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 cord-&...
14
votes
3answers
26k views

How to give preference over one network connection over another?

Like most laptops, it has 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, I ...
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
2answers
11k views

Stop VPN being used on internet traffic on Win 7 [duplicate]

Possible Duplicate: How can I make the Windows VPN route selective traffic (by destination network)? How To Use Local Internet Connection To Access Internet While Still Connected with VPN I ...
14
votes
1answer
612 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
votes
5answers
26k 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 [...
14
votes
5answers
10k views

IP address alias assigned by DHCP

I would like to create several aliases to eth0, but have the addresses assigned by DHCP instead of being set to static IP's. Is this even possible? All the examples I've seen assign a static IP using ...
14
votes
5answers
13k views

How can I make Windows prefer my wired connection?

I am running Windows 7 RC, but have noticed this behavior on Windows Vista as well. When I am in an area that has a wireless network and I plug in my wired network so I can get a better connection (...
14
votes
2answers
63k 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 ...
14
votes
3answers
12k views

SSH Reverse socks tunnel

ssh -D can make a socks port at local machine, which pass the traffic to the remote, then to other places. ssh -L port:host:hostport, listen port at local machine, pass the traffic to "host:hostport" ...
14
votes
3answers
41k 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
votes
4answers
10k views

If I have two internet connections on osx, how can I use both to increase my bandwidth?

I understand that any one connection (such as a non-p2p download) will use just one of the connections, but since most normal activity involves multiple connections at once, I can still in theory ...
14
votes
2answers
41k views

How can I connect to a web server running in a VM when the VM is in NAT mode?

I've got a development webserver on an Ubuntu box inside of VMWare Workstation 7.1.3. I'd like to run a web browser on a Windows machine (the host OS) for actually testing a web page I'm working on -- ...
14
votes
2answers
330 views

How on earth can this reported hour-long ping time be real?

I recently spent the Easter bank holiday with my parents, who live in a very rural area in the UK. They have a (terrible) ADSL internet connection, which is run over several kilometres of dodgy copper ...
13
votes
3answers
2k views

I have both IPv4 and IPv6 public addresses. Why?

For my home network, my public IP address shows through some websites as an IPv4 and others as an IPv6 address. I have read this thread and understand that it is possible for my ISP to have assigned ...
13
votes
6answers
9k views

Run script in OS X 10.6 on network connection. (like /etc/network/if-up.d/)

Is there any way to run a script when a network interface comes up in Mac OS X? I've tried putting a script named ip-up in /etc/ppp but it doesn't seem to fire when I disconnect and reconnect to a ...
13
votes
6answers
4k 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
votes
4answers
24k views

How to share CPU or RAM?

In networking we share File(Disk Driver) or Databases. But how can we share CPU or RAM over the network.
13
votes
1answer
23k views

802.1X: What EXACTLY is it regarding WPA and EAP?

I understand 802.1X to be some sort of port authentication control. However, when I was checking out the encryption settings for my wireless I found 802.1X in a drop down along with WPA2, WPA and WEP, ...
13
votes
1answer
2k views

Why do some network connections dominate others?

I have my suspicions as to why, but I want someone with a stronger background in networking to explain. Why is it that when downloading from multiple different locations, certain connections ...
13
votes
1answer
23k views

Difference between NetBIOS and SMB

I'm also trying to discover the relationship between netbios-ssn typically running on Port 139 and microsoft-ds running on Port 445. I understand that previously Port 139 was more popular with older ...
13
votes
3answers
9k 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
votes
2answers
47k views

How can I force Windows 7 to give my LAN (wired) conection priority over my WiFi?

Given the choice between my LAN (wired) and my WiFi connections, my Windows 7 PC gives priority to the WiFi - how can I make it prioritize the LAN connection?
13
votes
4answers
9k views

Where can I find an unswitched ethernet hub? [closed]

Back when I was just getting into networking, ethernet hubs were common, and switches were a fancy, expensive alternative. Then the price of switches came down so much that hubs became pretty much ...
13
votes
9answers
25k views

How to make windows task manager to show network usage?

I found that Windows 8 Task manager does not show network usage correctly: As you see, my torrent client downloads at a speed of 1 MB/s, while Windows shows zero. All adapters are disabled except ...
13
votes
4answers
18k 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 ...