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

791
votes
3answers
153k views

Transatlantic ping faster than sending a pixel to the screen?

John Carmack tweeted,I can send an IP packet to Europe faster than I can send a pixel to the screen. How f’d up is that?And if this weren’t John Carmack, I’d file it under “the interwebs being ...
477
votes
9answers
49k views

Did I just get hacked?

I am developing a consumer product, and it is supposed to be connected to the Internet, so as expected, it is connected to the Internet so that I can properly develop it.I went away for an hour or ...
361
votes
1answer
20k views

Ping faster than light

I just discovered very strange thing while testing my internet connection.My ping is smaller than it should be. For example ping time to Arizona State University is about 14ms.eryk@eryk-pc:~$ ping ...
310
votes
5answers
174k views

What does the “Fi” in “Wi-Fi” mean?

I just got into a heated discussion about Wi-Fi. What does the Fi in Wi-Fi mean? I would have thought potentially "frequency interface" since all network adapters are classified as interfaces. However ...
221
votes
9answers
575k views

Test if a port on a remote system is reachable (without telnet)

In the old days, we used telnet to see if a port on a remote host was open: telnet hostname port would attempt to connect to any port on any host and give you access to the raw TCP stream.These days,...
192
votes
15answers
137k views

How to reliably keep an SSH tunnel open?

I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken.If I could at ...
186
votes
11answers
312k views

Is it possible to ping an address:port?

I am not into networking, and I have the following question related to the Linux ping command.Can I only ping an address? For example:miner@raspberrypi ~ $ ping onofri.orgPING onofri.org (67.222....
184
votes
7answers
467k views

How can I list all IPs in the connected network, through Terminal preferably?

Using Ubuntu 10.10, I was wondering if there was a command line command that can list all the IPs of devices connected to the network?I would use this for example, to list all the computers ...
176
votes
5answers
196k views

Connect to the host machine from a VirtualBox guest OS?

I'd essentially like to access my host computer from the guest in VirtualBox. Is there an IP address given for my host which I can use from the guest? Are there extra steps required to set this up? I'...
150
votes
8answers
22k views

How do I get a static IP address for my teapot?

I maintain this teapot:It returns a 418 error when it is pinged, and it is pinged regularly by people arriving from the relevant Wikipedia page. (For those interested, and there appear to be a few ...
145
votes
2answers
31k views

What is a “Magic Packet” for waking a computer?

My wireless adapter (Intel Dual Band Wireless-N 7260) has two settings in Device Manager which I cannot explain.Wake on Magic PacketWake on Pattern MatchAfter a bit of research, I found this ...
141
votes
4answers
25k views

What's the difference between 127.0.0.1 and 0.0.0.0?

I understand that 127.0.0.1 points to localhost, and so does 0.0.0.0 (correct me if I'm wrong). So, what's the difference between 127.0.0.1 and 0.0.0.0?
140
votes
11answers
470k views

How do I know what proxy server I'm using?

I need to know what the address for my proxy server is so I can configure another program to also use it. If I go into IE, Internet Properties, LAN Settings, then all I see is an automatic ...
137
votes
9answers
196k views

Disable “These files might be harmful to your computer” warning?

I keep getting this irritating warning when copying files over the network:These files might be harmful to your computerYour internet security settings suggest that one or more files may be ...
136
votes
3answers
323k views

What are CLOSE_WAIT and TIME_WAIT states?

When I do netstat -a on my Windows machine, I get a listing of the ports with one of the four states:LISTENINGCLOSE_WAITTIME_WAITESTABLISHEDWhat do CLOSE_WAIT and TIME_WAIT mean/indicate?

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