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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19
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1answer
2k views

Is it possible to create firewall that only allows legitimate webserver traffic on port 443 and not any other service?

I always used the simple trick to bypass most firewalls which prevented me from using any ports. I simply opened ssh on one of my servers on port 443 and tunneled all traffic through there. However I ...
19
votes
2answers
20k views

How to fix extremely slow Virtualbox network download speed?

I'm using an Ubuntu 12.04 VM (hashicorp/precise32) via Vagrant/Virtualbox. It seems to have an exremely slow download speed compared to my host system. This is what I get with the host system (OSX) ...
19
votes
4answers
151k views

Why can't Chrome load a web page? ERR_NAME_NOT_RESOLVED

Chrome gives this error, yet I can ping the server! The server at www.odesk.com can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to ...
19
votes
2answers
12k views

Does All LAN Traffic Travel Through A Router

I have a very simple question: if I have a router (DHCP enabled - leasing IP addresses between 192.168.0.2 and 192.168.0.254) with a switch plugged in, and I plug two computers into the switch, will ...
18
votes
8answers
185k views

What's the difference between intranet, extranet and internet?

What's the difference between intranet, extranet and internet?
18
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1answer
2k views

Pinging different IP address than what I entered [duplicate]

Can anyone please explain why CMD pings a different IP address than the one I am searching for?
18
votes
3answers
60k views

IPv4 vs IPv6 priority in Windows 7

I have IPv6 connectivity through Hurricane Electric tunnel. Since IPv6 day this year, many services (google.com, facebook.com, etc.) enabled IPv6 on their main domains. On my Windows machine, IPv6 is ...
18
votes
9answers
4k views

Google's DNS service: Google public DNS

Google declared their free DNS service, Google public DNS: To try it out: Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS servers. They claim that: ...
18
votes
9answers
36k views

Changing network type from Unidentified network to Private network on an OpenVPN connection

Is it possible to change the connection type in Windows 7? I have a OpenVPN connection which is identified as "unidentified network" and I do not want to apply certain rules to all unidentified ...
18
votes
5answers
54k views

How to tell Windows 7 to ignore a default gateway

I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192....
18
votes
4answers
20k 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?
18
votes
3answers
146k 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 ...
18
votes
3answers
13k views

What is the purpose of a Windows Workgroup?

In Microsoft Windows, what is the purpose of a Workgroup? I understand that a Domain allows the administration of security (user names, passwords, file access, etc.) to be centralized. But what does a ...
18
votes
4answers
14k views

Ethernet over powerline adapters - how far will the data travel?

I would like to get a pair of Ethernet over powerline adapters so I can get a better connection on my desktop than what I currently get over WiFi. My problem is that I live in a block of flats. I'm ...
18
votes
3answers
9k views

Which home router support IPv6?

Which routers suitable for small/home networks support IPv6 as described in the Microsoft document IPv6 Support in Home Routers? Edit: to answer some comments wondering about the reasons of wanting ...
17
votes
7answers
25k views

What interesting uses for IPv6 are out there? [closed]

IPv6 is reasonably easy to setup these days via 6to4 tunneling, but once done, what does one do with it? What interesting services are out there already using IPv6 or providing exclusive features over ...
17
votes
6answers
2k views

Will the ethernet pull bandwidth if unplugged?

I'm fairly certain that this isn't a problem, but like a phone charger it will still pull electricity even though you aren't charging anything if you leave it plugged into the wall. Though minimal it ...
17
votes
5answers
88k views

How do I unmap a disconnected network drive in Windows 7?

The drive is disconnected, and I'm off the network. How do I unmap the drive? This seems like it should be a simple procedure, but I'm missing something. My Google-fu is weak today...
17
votes
4answers
62k views

How to disable ipv6 on a specific interface in linux?

Could someone tell me how to disable ipv6 auto-config on a specific network interface in CentOS? The current situation is: A PC has two network adapters eth0 and eth1 that are connecting to the same ...
17
votes
12answers
2k views

What is the most practical security method for a home wireless network?

Quoting Ars Technica: Proper wireless network (802.11a/b/g/n) security is quite simply out of reach for most organizations. ... Given that WEP (both 64- and 128-bit), WPA1/2 (PSK), and ...
17
votes
1answer
2k views

Can I detect sniffers in monitor mode on my Wi-Fi?

Attackers can sniff Wi-Fi networks in monitor mode to intercept the data without connecting to the router. Is it possible to check if somebody is sniffing my network?
17
votes
4answers
32k views

When concurrently connected to wired and wireless ensure Windows 7 uses wired connection

When I am at my desk and my laptop is in its docking station I want to ensure that it uses its wired connection and not my wireless network. I am hoping/guessing that the preference in connection is ...
17
votes
5answers
4k views

What is the actual IP address of my computer

I am testing out to see whats my IP address but depending on which website I used , I get different IP address . I am using a router If i use this , My IP address is If i use this , My IP address ...
17
votes
1answer
9k views

Cisco VPN Client hangs at “Opening cert store”

I am unable to launch the Cisco VPN Client successfully. When the splash screen reaches the step labeled "Opening cert store", it simply hangs and goes unresponsive. In the event viewer (eventvwr....
17
votes
3answers
18k 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 ...
17
votes
6answers
95k 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 ...
17
votes
4answers
27k views

How to sniff for wireless MAC addresses in area - My laptop got stolen

A few days ago my apartment got broken in, and they took all the electronics, including my $1500 laptop. We are pretty sure it's an inside job (as in someone from the same building), so I believe ...
17
votes
3answers
66k 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 ...
17
votes
2answers
66k 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 ...
17
votes
2answers
702 views

What is a hostname?

I'm setting up a Fedora 15 box in my local network. It's going to have Internet access and share media stuff like photos. In one step of the installation process it asks for "hostname", what could ...
17
votes
1answer
15k views

How to request a specific IP address from DHCP server?

How to request a specific IP address from DHCP server? This question also touches the topic of DHCP address reservation in a router. Background: My home routers DHCP table only allows to create an ...
17
votes
3answers
105k views

How do I join a Windows 8 PC into a domain?

How can I enroll a Windows 8 PC into an existing domain?
17
votes
6answers
40k views

Share single iTunes library across multiple computers

I have a large (> 2TB) iTunes library of music and videos that I keep on a Drobo connected to an Airport Extreme base station so that I can access it wirelessly from my MacBook. This works great for ...
17
votes
4answers
34k views

How can I monitor my ISP's connection quality over time?

I've got a very bad ISP and want to monitor the connection quality over a month's time. At the moment I just wrote a script which logs ping requests to Google's DNS server 8.8.8.8. How can I do ...
17
votes
2answers
8k views

How to start networking on a wired interface before logon in Ubuntu Desktop Edition

Problem Ubuntu 9.10 Desktop Edition (and possibly previous versions as well, I haven't tested them) has no network connections after boot until at least 1 user logs in. This means any services that ...
17
votes
2answers
40k 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 ...
17
votes
2answers
22k 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 ...
17
votes
5answers
37k views

How to take advantage of two Internet connections (WiFi / Wired)?

I have two separate internet connections, one through WiFi and other Wired. However, generally I have observed that Windows try to use only one ( mostly faster one/ Or Wired by preference - I am not ...
16
votes
21answers
67k views

How can I send super large files directly to another computer in the Internet for free? [closed]

I regulary need to transfer very large files (30 GB) to my friend - financial statistics. I don't have any problem with bandwidth: it is very broad here. I did some research in the area, so: 1. I ...
16
votes
3answers
2k views

Does the sequence number of TCP packet headers wrap around?

I was wondering, since the sequence number in a TCP header field is randomly chosen during the handshake and is gradually incremented as packets are exchanged, what happens after 2^32 - initial_seq_no ...
16
votes
2answers
2k views

Does https encrypt URLs, too?

This is fairly easy. If I go to https://webserver.com/someurl?a=b, will the someurl?a=b part be protected, or just the contents of the site?
16
votes
1answer
757 views

Did my network just get hacked?

Something very strange just happened. A long story short, I went on to my computer and it told me that access was blocked to this PC. So I tried to go to 192.168.1.1, but it didn't work on my blocked ...
16
votes
9answers
53k views

Why do I only get 300-400 Mbit/s on my 1000 Mbit/s network?

My setup is like this: Laptop <--> Router <--> Desktop They all support gigabit Ethernet. I'm using the 'iperf' TCP/IP benchmark on the laptop and desktop, and I've never gotten more than 400 ...
16
votes
2answers
31k 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 ...
16
votes
7answers
49k 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 ...
16
votes
3answers
35k 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 ...
16
votes
3answers
2k views

What do different types of LAN IP addresses mean?

I have seen LAN IP addresses in the following ways: 10.0.0.* 192.168.0.* 192.168.1.* 192.168.2.* 127.0.0.* (This one is normally with a 1, and I'm not sure if it is LAN, since I see it normally ...
16
votes
4answers
13k views

Computer wakes by itself, but wake source is unknown

I have an interesting problem. I am using Windows 8.1 on my PC and I have WOL enabled from my BIOS and my LAN card settings and it works just fine. But, since a couple of weeks back, my computer ...
16
votes
5answers
59k 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 ...
16
votes
2answers
16k views

Simulating a low-bandwidth, high-latency network connection on Linux

I'd like to simulate a high-latency, low-bandwidth network connection on my Linux machine. Limiting bandwidth has been discussed before, e.g. here, but I can't find any posts which address limiting ...