Questions tagged [networking]

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.

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Unable to access localhost & Internet using one adapter in CentOs

I have the below dev. environment. Hardware:- Windows 7, 32bit, HP Laptop. Software:- CentOs 6.5 running on VirtualBox 4.3.10. In a nutshell The problem is that I can't access the internet and ...
Bimlik's user avatar
  • 87
0 votes
3 answers
45k views

Can I use a ethernet splitter to connect a router to two devices? [duplicate]

I have a portable mini wireless router with different functions (AP/Client/Router). Can I use a ethernet splitter to give internet access to two devices? The router only has a ethernet port and ...
NeDark's user avatar
  • 263
0 votes
1 answer
1k views

Port forwarding not working on router using NAT?

I have a Dlink router which uses NAT and I tried several ports but every time I try to connect my server(Raspberry Pi) it says connection refused. I can’t connect to the server on the RPi itself.
MIDAS's user avatar
  • 11
-4 votes
2 answers
323 views

How should I configure a router, a bridge and an access point?

Sorry for my last post I added more information here. The idea for this setup is the following: since the main modem router is far away from me, the second one is just a bridge I don’t use it but it ...
Brahim's user avatar
  • 1
863 votes
3 answers
177k 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 ...
Konrad Rudolph's user avatar
346 votes
5 answers
183k 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?
Sagnik Sarkar's user avatar
226 votes
15 answers
925k 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 ...
Mike Christensen's user avatar
212 votes
7 answers
203k views

scp between two remote hosts from my (third) pc

I have two remote hosts. host1-> 10.3.0.1 host2-> 10.3.0.2 Both run an ssh server. The ssh server listens on port 22 in host1 and on port 6969 in host2. Now, using my local machine, I need to copy ...
uwais ibrahim's user avatar
134 votes
7 answers
107k views

VirtualBox guest OS accessing local server on host OS

On my Ubuntu host I have my local webserver. I installed VirtualBox and Debian as a guest. I would like the Debian guest to be able to hit my webserver running on my Ubuntu host (for example, I just ...
Maxim's user avatar
  • 2,373
106 votes
8 answers
353k views

Is there a good tool for monitoring network activity on Mac OS X? [closed]

Is there a good bit of software on Mac OS X that I can use to monitor incoming and outgoing network activity? Nothing too geeky, I just want something simple to use. I'm on version 10.6 (Snow Leopard)...
xentek's user avatar
  • 1,181
96 votes
5 answers
159k 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 ...
amphibient's user avatar
  • 2,183
77 votes
2 answers
150k views

Now to connect to a VirtualBox guest OS through a VPN?

I have an Oracle Linux guest running a web server in VirtualBox on a Windows 7 Host. I need to set the networking up so that I can do 3 things: the host can connect to the guest through a browser and ...
ewok's user avatar
  • 4,191
65 votes
7 answers
62k views

How to throttle bandwidth on a Linux network interface?

Is there a way to constrain the bandwidth on a NIC in linux? I'd like to be able to simulate an arbitrarily slow connection.
Mark Borgerding's user avatar
60 votes
7 answers
175k 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 CENSORED....
LanceBaynes's user avatar
  • 4,090
56 votes
5 answers
48k 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?
Kunal's user avatar
  • 663
54 votes
7 answers
102k views

Does using OpenDNS or Google DNS affect anything about security or gaming speed?

I used to use google DNS and OpenDNS long time ago, didn't notice any improvements. I recently heard a security expert saying that OpenDNS is the best way for malware protection. But found out that ...
Lynob's user avatar
  • 5,360
50 votes
6 answers
53k views

What is ::: in the Local Address of netstat output?

This is the output of netstat -tulpn that I get: tcp 0 0 127.0.0.1:2208 0.0.0.0:* LISTEN 2055/hpiod tcp 0 0 127.0.0.1:631 0.0....
Pradipta's user avatar
  • 601
49 votes
4 answers
262k views

Microsoft Remote Desktop Bandwidth Usage

I am wondering how much bandwidth in terms of bytes sent/received is consumed by a typical remote desktop session. I need to know this because our ISP enforces a cap on monthly bandwidth usage (i.e. ...
Salman A's user avatar
  • 1,722
43 votes
9 answers
232k views

Find an unknown static IP + subnet mask of device?

I have a device set with a static IP and subnet mask. I do not know the IP or subnet mask. How can I find the devices IP and subnet mask? It is a piece of hardware, not a PC. It will not take an IP ...
gpresland's user avatar
  • 590
43 votes
8 answers
164k views

Will an Ethernet splitter work?

I have a room with only one Ethernet cable going there, but I would like to connect two devices on it. Is an Ethernet splitter suitable for that? I am talking about something like this: In theory it ...
midlan's user avatar
  • 543
43 votes
3 answers
147k views

Is there a good DNS server I can install on Windows 7 for a LAN? [closed]

I have a few computers on my LAN, and now I'm getting tired of remembering the IP addresses all the time, so I would like to start using DNS names on my LAN. I have a heterogeneous network with ...
Jonas's user avatar
  • 27.5k
39 votes
3 answers
21k 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 MAC ...
Justin Ethier's user avatar
38 votes
9 answers
84k views

How to monitor internet connection for interruptions - for Mac OS X

I have subscribed to a new ISP and I am experiencing problems with this new ISP. The problems are several micro interruptions on the internet connection, kind of lags, that is probably related to ...
Duck's user avatar
  • 1,757
38 votes
3 answers
102k views

How to Ditch CenturyLink Fiber "Modem"

How can I ditch the rented router CenturyLink gave me and use my own router with CenturyLink Fiber internet? Can I use routers like Orbi or Google Wifi that don't support VLAN tagging?
user avatar
37 votes
1 answer
41k views

What is the difference between telnet and netcat?

I am looking for an explanation where I can find the difference between telnet and netcat. In which cases should I use telnet and netcat? What a telnet can do that netcat can not do and vice versa? I ...
rbashish's user avatar
  • 496
37 votes
3 answers
13k views

Why does the registered domain name “localtest.me” resolve to 127.0.0.1?

I was reading an article about Server-Side Request Forgery. In that article the attacker found that 127.0.0.1 was open to the internet. The victim then blocked 127.0.0.1, but because many other IPs ...
not2qubit's user avatar
  • 2,285
37 votes
3 answers
95k views

In Windows 10 how do you ensure all traffic goes through VPN?

What is the easiest way to ensure all traffic goes through the VPN in Windows 10? Are there any built in ways? I'm basically looking for an internet kill switch in the case the VPN fails. I read that ...
Celeritas's user avatar
  • 8,229
36 votes
4 answers
141k views

What does /16,/24 mean with regards to ip addresses?

I am trying to understand how network topologies work in large scale networks such as college campuses. I often see the phrases /16,/24 with regards to ip addresses. I would like to know what /16 ...
Max's user avatar
  • 481
35 votes
2 answers
88k views

Howto setup a `veth` virtual network

I'd like to setup three virtual network interfaces (veth) which can communicate with each other. To simulate a three node cluster, each program then binds to one veth interface. I'd like to do it ...
Reinder's user avatar
  • 455
32 votes
4 answers
158k views

Is it possible to connect two PCs via USB C?

I'm trying to connect a single PC with limited storage (Mini ITX) to a much bigger PC full tower that has a lot of hard drive storage. Both machines have USB-C on them so I was just wondering if I can ...
Brian's user avatar
  • 423
32 votes
9 answers
332k views

How to bypass web URL filtering service to access blocked websites (proxy) [closed]

I'm using network, where services such as Gmail or any other e-mails, Google Drive, Dropbox, all social networks are blocked. Basically my goal is to access simply GMail, but I couldn't find any way ...
kenorb's user avatar
  • 25.4k
32 votes
3 answers
128k views

"Network is unreachable" when attempting to ping google, but internal addresses work

I can get to other PCs in my house on the 192 network, but trying to go outside gives me the "network is unreachable" message. p3p1 is up with a good IP Address. Running Fedora 16. What should I ...
Scott C Wilson's user avatar
29 votes
5 answers
88k views

How is double NAT bad practically?

As the ISP-provided modem was generating pretty weak WiFi signal I've disabled its WiFi function, bought an Apple AirPort Extreme and connected it's WAN port to the modem. Now everything works just ...
Ivan's user avatar
  • 7,503
27 votes
3 answers
52k views

Wrong IP address from DHCP client on Ubuntu 18.04

I'm experiencing a weird issue where my Ubuntu 18.04 (server) box gets issued a wrong IP address during boot from the DHCP server. Running dhclient after boot on the interface results in the right IP ...
NoMad's user avatar
  • 752
27 votes
2 answers
37k views

How does Mac OSX prioritize network interfaces when routing?

To give a concrete example, how does OSX choose which of these default entries from netstat -nr to route to? Destination Gateway Flags Refs Use Netif Expire 0/1 ...
studgeek's user avatar
  • 2,415
26 votes
6 answers
137k views

How to get real-time network statistics in Linux with KB/MB/Bytes format and for specific port or application processID?

I used IPTraf, Iftop, vnstat, bwm-ng, ifconfig -a. None of them is helping me to find real-time packets that are being sent/received from my application in KB or MB format. The reason is I am writing ...
YumYumYum's user avatar
  • 1,677
26 votes
5 answers
85k 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....
zildjohn01's user avatar
  • 2,337
26 votes
4 answers
69k views

Correct domain name for a home desktop Linux machine

I have several machines running Debian, and during install, I left the domain name field blank. This hasn't affected anything so far, but I'm curious what the correct thing to set that field to is if ...
nebuch's user avatar
  • 325
20 votes
6 answers
50k views

Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working The most obvious symptom of this problem is that nslookup IS working, while ping -4 name.com is NOT working. That's because nslookup contains its ...
john v kumpf's user avatar
19 votes
5 answers
25k views

What is the difference between 127.0.0.1 and my assigned IPv4 address?

I read here that: 127.0.0.1 is the IP (IPv4) address of your local computer, synonymous with localhost. When I run the command ipconfig what I actually see is some other IP address. So I’ve ...
Dhiwakar Ravikumar's user avatar
19 votes
13 answers
88k 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 ...
Dims's user avatar
  • 12.7k
18 votes
7 answers
87k views

Is there a way to disable the DHCP client in Raspbian Linux on a Rasperry Pi?

I have a Linux server (Rasperry Pi using Raspbian as OS) that should be using only static IP. However I noticed that it also has got IP from DHCP server (The IP given out by DHCP is 192.168.111.2). ...
Madoc Comadrin's user avatar
17 votes
5 answers
87k views

What happens when Gigabit switches are connected over an old CAT5 cable?

If two gigabit switches are connected using an old CAT5 (not CAT5e) cable, will they slow their connection down to 100 Mbit/s?
basic6's user avatar
  • 2,707
16 votes
6 answers
146k views

Can I chain two routers together keeping DHCP on both?

I have read that I can connect a second router by turning off DHCP and NAT, but I want the second router to assign DNS (I'm using it as an access point for my kids, and will use OpenDNS family service ...
Aerik's user avatar
  • 940
16 votes
1 answer
38k views

Mystery WiFi network shows up when laptop is connected

When my laptop, a Dell XPS 15 (9530), is connected to my WiFi network, a new network with the SSID "DIRECT-IE[laptop name]msSP", where "[laptop name]" is replaced with the name of the computer. ...
Marcel's user avatar
  • 355
16 votes
3 answers
76k views

How can I restrict windows 7 to only use the local subnet, but block the internet

I want to block all internet connections to and from my windows 7 machine, but allow it to access everything on the local network. The local network is behind an Apple Airport Extreme. What is the ...
Tom de koning's user avatar
16 votes
3 answers
72k 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 ...
Chris Farmer's user avatar
15 votes
3 answers
46k views

Why is my LAN not gigabit?

The in-wall CAT5e LAN cabling in my newly built house (photos during construction) is weird: it works perfectly fine except it only allows 100Mbps and not gigabit. To clarify, the wired LAN "...
Torben Gundtofte-Bruun's user avatar
15 votes
6 answers
100k views

Wrong order in CAT5 cabling -- does it matter?

I've got in-wall CAT5 wiring in my house. The wall sockets were done by an electrician and the requirement was straight-through T-568B, but I think he got it wrong. When I use a cheap cable tester, I ...
Torben Gundtofte-Bruun's user avatar
14 votes
1 answer
36k views

Linux command-line: Quick way to disable internet (keeping LAN)?

Split question: this other one here is for Windows. Linux: Fastest way to disable internet (keeping LAN) from command line? I think the easiest way to deactivate internet (not LAN) in Linux is to ...
Sopalajo de Arrierez's user avatar

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