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.
34,584
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TCP throughput much better than UDP
I'm monitoring the performances of a WAN link with iperf between two windows machines on both ends.
Surprisingly (for me), TCP single session default window reaches a throughput of 12Mbps, while UDP ...
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3
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3
answers
1k
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How do I know if a connection goes down in a load balancing router?
I am using a TL-R470T+ load balancing router to combine my two broadband connections. Is there a way I can know as soon as one of the broadband lines goes down?
My approach so far:
I have tried to ...
- 31
0
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1
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How to bridge networking in this nested virtualization case?
This is a follow-up for my earlier question. Based on feedback from Daniel B and Deltic, I switched from VirtualBox to QEMU, which can handle 64-bit guests on a VM as a host (Hyper-V, in my case) - a ...
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2
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Why does rsync over SSH give me 10x the throughput of SCP?
scp user@aws-ec2:~/file file
rsync --partial --progress -Pav -e ssh user@aws-ec2:~/file file
scp only gives me 200K/s, but rsync gives me 1.9M/s
I tested several times, all same results.
rsync ...
- 395
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1
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55
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IP routing devices with security
I'm looking for a device that we can use to do routing between various IP ranges on our network, but offer us some security as to which devices can communicate where.
Existing network has 2 major ...
- 103
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2
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280
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Windows 10 No Internet
There's several no "internet" questions on here already, but most of them are a different scenario.
The machine in question here is a Windows 10 Pro, Dell XPS 12, factory specs. It literally can ...
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1
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609
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Two routers off one internet line for two different networks
Ok here is my situation. My sisters family moved in with us and there kind of stubborn with the internet. They want to use their router for their own network. The way I have it setup is we have our ...
1
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1
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WiFi adapter TL-WN727N is not working
I am using Zorin OS 11. My wifi adapter( TP-link: model:TL-WN727N) is not working at all.
I typed "lsusb" in terminal, then the adapter showing as "Ralink MT7601U". So, that means the adapter is okay ...
- 11
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2
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290
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PKI Certificate Authority private a keys and certificates
I'm trying to set up OpenVPN and I'm a bit confused about the terms.
From what I've read, a PKI consists of:
A separate certificate (also known as a public key)
A private key for the server and ...
- 125
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0
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104
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dd file copy uploading to server is fast, downloading image back to local machine is slow
I've used dd to copy a hard drive on one server to the samba share on another server. The speed was between 30-60 MB/s, about what I'd expect. The connection is a dedicated gigabit line for each image....
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input same line as echo batch file
Cannot seem to get this exactly right, trying to setup a batch file to do some network commands, such as ping. I have the following code:
echo Please enter the IP Address to TELNET
echo IP Address:
...
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1
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1
answer
748
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Linux Web Server Cannot ping localhost or anything on the internet
My ubuntu 12.04 server was working fine a few days ago. I didn't change any server configurations, but today all of a sudden I can't ping anything. What could be the potential issue here? I can't even ...
- 2,989
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256
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Load balance 2 DSL routers using a 3rd(4 LAN, 1 WAN port router)?
I would like to install open-WRT on a router MR3420 v 2.3 and want to know if it can act as Load balancer for 2 DSL routers below. but I am not sure if openWRT will solve the following use-case
I ...
- 365
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1
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860
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How to delete Ethernet profiles?(picture link attachment)
I have "Ethernet" and "Ethernet 3" profiles as shown below and I want to delete them. I'm also confused there is something written just below their name which are "Realtek PCIe FE Family Controller" ...
user612978
0
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391
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Why Apache blocks itself from listening to port 8080?
As you can see in the image if you enlarge it, when I run httpd.exe apache says it cannot bind to address 8080. Thing is, the reason apache cannot bind to address 8080 is because apache IS the one ...
- 313
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1
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et0 vs tun0 with OpenVPN
Hello I'm trying to understand how OpenVPN works and I'm wondering the following thing :
Since all the traffic should pass through tun0 once the computer is connected to the VPN you should be able to ...
- 995
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1
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Unable to mount Elastic File System on EC2 (mount.nfs4: Connection timed out)
I am trying to mount an EFS file sytem on an EC2 instance. Here is what I'm doing:
Connect to EC2 instance using
ssh -i "MyKeyPair.pem" [email protected]. ...
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0
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1
answer
270
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Command to check IPV6=yes in ufw is in effect
We can set IPV6=yes by editing /etc/default/ufw to support monitoring of ipv6 packet transfer. But it will take effect only after ufw is disabled and enabled or reloaded.
The question is Is there a ...
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1
answer
7k
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Which XFINITY WiFi hotspot service - Use 'xfinitywifi' or 'CafeExpress' or 'XFINITY' network to use?
The XFINITY WiFi by Comcast hotspot service has an app with a Help file that shows a screenshot saying:
You can also select any network listed above the Available Networks option as shown in this ...
- 886
2
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2
answers
2k
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Wired Internet stops working when laptop is plugged in
I have wired Internet that runs via my electrical socket with a Powerline Adapter. It works perfectly UNTIL my laptop is plugged into another electrical socket.
As soon as the laptop charger is ...
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2
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204
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How is wifi used to detect network location? [duplicate]
On my iPhone, when WiFi is turned off and I use GPS/Navigation apps, the phone suggests that I should turn on WiFi for improved location accuracy. If I have WiFi turned on and am not connected to a ...
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3
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Are our prints being recorded or monitored in an office printer? [closed]
I was reading a joke about someone doing a prank via the office printer.
In the end they found him via the printer queue.
I was curious do companies record all documents we send to the printer?
So if ...
- 197
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0
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316
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Windows 10 excess bandwidth use with updates off?
On a small business (2008R2 Domain) with about 20 PC's recently upgraded a few to windows 10 Pro and shortly thereafter our puny 1.5 Mb download was maxed out.
I did some reading and ensured that all ...
- 33
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0
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1k
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How can I communicate to multiple devices that are all at the same IP address?
I work in a manufacturing environment and I have the need to communicate with up to 50 devices that are all at 192.168.0.2 from a single (Windows) computer. Assume that I don't have the ability to ...
- 457
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0
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Getting a self assigned IP address in Mac OS X 10.10 (Yosemite) on a Mac Mini
I have had a situation where I cannot access the internet and the network preferences list ethernet interface connected to DSL modem has self assigned IP address and cannot connect. It is set to ...
- 149
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1
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1k
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Unable to forward windows host port 80 to Centos guest port 80
Ok, so ive tried googling this many time already and still i am failing. I have a Windows 10 host with VirtaulBox installed. Inside my VirtaulBox i have a CentOS system installed. I have httpd running ...
-1
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1
answer
35
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isp - how is it impossible to connect internet except homepage? [closed]
one of ISP in my country allows free access to their website, but we have to buy data package to access the other internet.
My question is: how does this works( accessing one website but not others)? ...
- 3
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0
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205
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Remotely enable Windows 10 RDP without physical access
Given that I have network access and valid login credentials to my Win 10 Pro machine which was upgraded overnight from Win 7, how do I remotely enable Remote Desktop Protocol on my newly upgraded Win ...
- 143
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998
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Windows 7 set IP address on an offline system
I have a completely offline Windows 7 machine that I use for malware analysis. It's running VMware and I want to be able to SSH (using PuTTY) from my host machine into some Linux VMs, which would ...
- 141
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7
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27k
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Issue with Wifi Adapter with Docker Windows (Native, HYPER-V)
I just received a brand new work laptop and immediately installed the native version of Docker for Windows.
However I am seeing an issue that everytime the new network adapter for Docker via Hyper-V ...
- 183
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1
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67
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How can I establish whether my network chip is failing?
In the middle of a Skype call yesterday, my friend told me my framerate and audio had abruptly dropped to broken and unusable levels. I could still see and hear him perfectly. Instant messaging works ...
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1
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51
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A windows box network port is accessible within LAN but not through VPN
I have a windows box running apache. Its port 80 is accessible from any computer in the LAN. But not accessible to computers connected through VPN. The firewall on the box is set to allow TCP/80 for '...
- 103
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1
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iptables for routing 8080 and 8443 to 80 and 443 respectively
I have the below script that creates my iptables. How can I make it so if I access IP_ADDR:8080 or :8443 it routes to 80 or 443 respectively?
#!/bin/bash
# Delete all existing rules
iptables -F
# ...
1
vote
3
answers
64k
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why only download is slow but upload is fast on my computer?
I'm confused about a network problem on my PC. It hasn't had a problem before but suddenly its happening often since a week ago.
I tested the Internet speed at speedtest.net. My environment is:
OS: ...
- 31
1
vote
1
answer
1k
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Using Master Node for Internet
So I have a cluster of about 30 nodes. 29 nodes are run from the master node, which controls all the other nodes. Master node has access to internet. However other 29 nodes do not have access to ...
- 11
11
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4
answers
3k
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Ideas for wiring an apartment building for wireless (multiple nodes)
I am the admin of an apartment building. We are migrating from our crappy setup to a Ubiquiti setup. I am therefore performing an audit on the network topology. Here is the current setup:
Router (...
- 221
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1
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How to create accounts for users on network?
In schools, colleges etc.. there are some software installed that only allows access to internet if a user and pass is entered. Ex - Cyberoam
I have seen this in colleges, the network admin manages ...
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votes
2
answers
414
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Running a DHCP server without conflict
I have a single chip computer running ubuntu on it and I want to run a dhcp server on it to give addresses to any machine connected directly to it. Since it is a portable computer, I regularly connect ...
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1
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509
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How do I change my MAC address on GNU/Linux?
I'm trying using macchanger (ip link set wls1 down, macchanger -r wls1 and ip link set wls1 up) but it doesn't work. When I try to connect to my wifi the MAC address is set to the default value... It'...
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2
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3k
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Two Internet Connections - One LAN (Load Balancing?)
If we have two different Internet Connections (one is substantially faster than the other), is there any way to connect both to the LAN, using some kind of load balancing to utilize both connections.
...
- 113
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2
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OpenWRT - how to do initial login (ssh) if 192.168.1.1 can't be routed?
I also posted on the OpenWRT forum about this issue. I'll copy the text of the problem verbatim, below, but here's a summary.
Another edit - my LAN/WAN jack LEDs are not lit up while attempting to ...
- 181
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4
answers
2k
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Understanding unique ip and port [duplicate]
My browser is Firefox, with 3 open tabs:
tab1-->google.com
tab2-->yahoo.com
tab3-->msn.com
All of them use port 80, and so does Photoshop:
How does computer know which data belong to which ...
- 176
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1
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50
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Rewrite hostname on OS X
I'm trying to rewrite a hostname using the hosts-file in OS X using the hosts-file and the following entry localhost db meaning that when i access http://db/ it should in reality access http://...
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1
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Failover between multiple gateways
I have a CentOS server running Centreon (a monitoring solution similar to Nagios) to monitor devices in multiple networks. The server could access the internet via 4 different gateways/routers, each ...
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0
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369
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Ethernet UDP First Received Packet is Delayed. Why?
I have a PC exchanging data using gigabit Ethernet with some custom hardware. My problem is that when data physically arrives on the network card (checked with an oscilloscope), the first frame is ...
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4
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1
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how to decrypt SSH packets captured on Wireshark tool on a SUSE Linux box
Actually i want to compare two ssh clients, custom client(using OpenSSH library) and PuTTY. And see what commands are being sent. i am using Wireshark on SUSE linux box for capturing network packets. ...
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0
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Approximation of a data transfer speed of a protocol
I have designed and developed a protocol for a progressive file transfer. Now I want to calculate some metrics for the same. The most important one is speed. Currently, I ran both the client and the ...
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What IP/ports should be opened for Docker Hub?
Given our client's restrictions, we cannot have our VMs completely open to the internet. However, we sometimes need to pull Docker images from Docker Hub.
We can white-list IP addresses and ranges, ...
- 201
1
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0
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190
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Route traffic of specific domain to different ip?
I am working on a project where my customer wants to redirect traffic going out to, let's say, www.google.com, to a localhost web server on Windows 10.
So instead of configuring a dedicated server ...
- 3,539
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Does "netstat -e" displays statistics of all network interfaces combined?
This is an example output of netstat -e:
Does this output displays the statistics of all the network interfaces combined, or does it only displays the statistics of a single network interface?
