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.
2,085
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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 ...
0
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3
answers
45k
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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 ...
0
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1
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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.
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2
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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 ...
863
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3
answers
177k
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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 ...
346
votes
5
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183k
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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?
226
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15
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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 ...
212
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7
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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 ...
134
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7
answers
107k
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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 ...
106
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8
answers
353k
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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)...
96
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5
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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 ...
77
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2
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150k
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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 ...
65
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7
answers
62k
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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.
60
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7
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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....
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5
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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?
54
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7
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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 ...
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6
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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....
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4
answers
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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. ...
43
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9
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232k
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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 ...
43
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8
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164k
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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 ...
43
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3
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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 ...
39
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3
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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 ...
38
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9
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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 ...
38
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3
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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?
37
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1
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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 ...
37
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3
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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 ...
37
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3
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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 ...
36
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4
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141k
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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 ...
35
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2
answers
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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 ...
32
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4
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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 ...
32
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9
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332k
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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 ...
32
votes
3
answers
128k
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"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 ...
29
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5
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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 ...
27
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3
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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 ...
27
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2
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37k
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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 ...
26
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6
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137k
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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 ...
26
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5
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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....
26
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4
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69k
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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 ...
20
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6
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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 ...
19
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5
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25k
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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 ...
19
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13
answers
88k
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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 ...
18
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7
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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). ...
17
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5
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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?
16
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6
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146k
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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 ...
16
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1
answer
38k
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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.
...
16
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3
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76k
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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 ...
16
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3
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72k
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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 ...
15
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3
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46k
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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 "...
15
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6
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100k
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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 ...
14
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1
answer
36k
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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 ...