Managing and using network connectivity on a Ubuntu system

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Comparison of wget & recv calls

wget call to download a particular content is much faster than recv system call. Say, with wget the speed is 10 MBits/sec and for the same content with same network conditions, with the recv call the ...
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2answers
41 views

Cannot connect to wireless router with TL-WDN4800 card on ubuntu 12.04

Sorry to be the 100000th user to ask for help on this matter, but I have tried several solutions from various blogs and I still can't connect. My wifi card detects my router, but can't connect to it. ...
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1answer
9 views

Catch Network Connection Events

I want to run a script when i connect to a hotspot which have a login page that runs on first connection. I use that script in order to login automatically without my attempt. I couldn't find which ...
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1answer
787 views

Brother DCP-7065DN, Ubuntu 14.04 64bit: Can print to network printer but cannot use the scan function

I'm using brscan4 and can ping it using brsaneconfig4 and it finds it but i cannot scan from the computer using either simple scan or xsane image scanning. Both programs don't show the scanner as ...
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23 views

It always says No connections are available

I got this problem a week ago when I open my laptop it says theres no connections available but there is I can connect to my phone with no problems the Broadcom 802.11g adapter sometimes missing then ...
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How only allow access to only host from guest in virtualbox

I am in such situation that where I am having virtualbox on Ubuntu and two VMs VM1 windows and VM2 linux. Both VMs are added in NatNetwork with name NatNetPrivate with subnet 192.168.15.0/24 so that ...
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Activating the wi-fi on a laptop using a Wi-Fi

I have a Wi-fi stick,I installed the its drive , but I can't activate the Wi-fi when I run lsusb I get this : engine@Engine:~$ lsusb Bus 002 Device 004: ID 0489:e00d Foxconn / Hon Hai Broadcom ...
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25 views

which DNS is answering to “www”

Today, by mistake, I run this command ping www on a virtual machine running a guest Ubuntu 14.04 under Windows 7 host. The ping response is one of my server outside the network where I work, let's ...
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How do I find number of NICs in my system?

While trying to find number of NIC in my laptop, I found this Superuser question on finding the total number of NIC's and ports attached on physical device. I got some commands to try on system : ...
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1answer
32 views

not able set static ip in my virtual machine

Can anyone help me to set a static ip in my virtual linux server machine? I did everything but still I am not able to set a static ip. I did the following changes in /etc/network/interface file. The ...
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1answer
19 views

Trouble connecting to inernet

I can't ping to anything outside of my local network and I think it has to do with my connection not getting a global scope, the ifconfig command returns this: eth0 Link encap:Ethernet HWaddr ...
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27 views

Wired Ethernet issue on Ubuntu 14.04: Link detected, but no internet

I can't manage to connect to the internet, while the Link is working. I'm living in a dorm and I'm currently connected to a Hotspot of a neighbor. Lenovo ThinkPad x230i running Ubuntu 14.04 I used ...
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Trying to access webpages and such results in endless waiting for “connecting to host”

When I try to open a webpage like google.com, the tab shows the status as connecting... and does so indefinitely, ie no error codes or pages are displayed. When I tried to use sudo apt-get update ...
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2answers
3k views

Enable mobile broadband not working

I'm using an EVDO usb Modem on 12.04. It works perfectly fine for few times. But now on wards when ever I try to connect it shows not enabled in status . I tried to enable it by ticking "Enable Mobile ...
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1answer
32 views

Will Editing HOSTS file in Ubuntu Improve my Network Security?

I have recently learnt about 2 different ways of editing the hosts file in Ubuntu for the purpose of blocking webpages and domains tracking my computer (protecting myself from tracking cookies), and I ...
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1answer
26 views

Not able to discover all avilable wifi networks in ubuntu 14.04 & weak signal strength

I am able to see only a single network, which is showing a very weak signal strength and I'm not able to connect to that too. Please find details below. ~$ cat /etc/*release* | grep -i distrib ...
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24 views

Ubuntu 14.04 Slow/unstable wifi

I have a lenovo Y-50 gaming laptop and after first boot I installed Ubuntu and avoided Windows 8 overall, anyways my internet is really slow and unstable even though the router is in the next room. ...
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How do I select network mode in Reliance 3g USB dongle

After googling on internet, I didn't find drivers for my zte modem. In my area 3G coverage is low and I am unable to change from 3G to 2G network, neither manufacturer provides it's drivers for ...
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1answer
373 views

how to show GUI of ns2?

I have installed NS2 (network simulator 2.34) on my ubuntu 12.4. But when I execute the ns ns-simple.tcl in the terminal only the following messages have been shown without any GUI or schematic of my ...
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Ubuntu OpenSSH having issues connecting to Cisco router. No such issues with other distro or OSX

Below is the output from ssh -vvv user@host. I've tried this on two separate computers running Ubuntu. It works from Opensuse and OSX, and also my Android phone. Interesting issue. Any suggestions ...
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1answer
52 views

ethernet stopped working on ubuntu 14.04, still works on windows

Everything was working fine on my Ubuntu 14.04 32 bit installation (on a Dell Vostro laptop) yesterday. I shut it down last night and since I powered it up this morning it is no longer handling the ...
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1answer
59 views

Does driver exist for Trendnet AC1200 Dual Band Wireless adapter for Ubuntu 14.04 64bit?

I'm new to Ubuntu and was wondering if Ubuntu 14.04 64-bit drivers exist for the Trendnet AC1200 Dual Band Wireless USB 3.0 adapter. I tried searching the forums for my specific adapter, but no luck. ...
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2answers
2k views

How to enable Wireshark without running as root in Trusty 14.04

I installed Wireshark. Running as root is not recommended, so I Did sudo dpkg-reconfigure wireshark-common According to: http://wiki.wireshark.org/CaptureSetup/CapturePrivileges ...
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1answer
146 views

How to connect with a Qualcomm/Huawei 3g modem

I have a 3g modem which lsusb reports as a Huawei Technologies Co., Ltd. E169/E620/E800 modem. However Windows' Network Connections panel shows it as a Qualcomm USB Modem 6000. So when I try to ...
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How to view media on a laptop on the same network, both running Ubuntu 14.04?

Sounds simple and probably is but here we go; I have a laptop and a Desktop PC both with Ubuntu 14.04 on them (The desktop has windows 7 too but I don't think that's relevant?) Anyway, when I click ...
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Wireless not working at all, thinkpad x240, intel 7260, ubuntu 14.04

I just bought a brand new Lenovo Thinkpad x240. After installing Ubuntu 14.04 everything there is no sign of WiFi. The card is intel 7260. It connects normally through a cable DHCP. after "iwlist ...
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6 views

Internet connection sharing using Airtel 4g LTE USB dongle [duplicate]

I have an Airtel 4g LTE USB modem (HUAWEI dial up) which I am able to successfully use on my Laptop's Ubuntu 14.04 LTS installation. I want to share this connection with other devices wirelessly ...
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2answers
79 views

Wifi not working - Broadcom b4312

And i have tried almost all the solutions to get my wifi work . I have compaq laptop with broadcom b4312 wifi adapter. I have tried installing bcmwl-kernel-source and then b43 drivers. The result for ...
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4answers
16k views

Delete eth0 avahi from the ifconfig list

Hello this is the response I get from ifconfig. Now I have two eth0 things being showed up. I need to delete the second one which says eth0:avahi. I posted my ifconfig's response on a site as I has ...
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1answer
15 views

Static IP Configuration_Ubuntu 14.04

I have a problem setting static IP on my Ubuntu Server 14.04 LTS. My computer has 2 interfaces p2p1 and p1p1. The p2p1 node - primary node - should be visible form the outer world. I use the ...
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22k views

How to network two Ubuntu computers using ethernet (without a router)?

How can I network two Ubuntu computers, so that they can "see" each other at an IP address?
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1answer
48 views

WI Fi Conected server not found 14.04

help here Im new on this system, i have been using version 12.04 for about a year along with windows XP on a Dell GX 680, i finally decide last week to get rid of windows completely and upgrade to ...
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2k views

Ubuntu 12.04 not connecting to wifi networks

I have a sony viao Laptop installed with Ubuntu 12.04 rfkill list all 1: hci0: Bluetooth Soft blocked: no Hard blocked: no 2: sony-wifi: Wireless LAN Soft blocked: no Hard blocked: no ...
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Dell R210 wired network not recognized during Ubuntu 14.04 install

I'm trying to install Ubuntu 14.04 in DELL server R210 and also in R520, and have the same issue, the network interface is not available/recognized during setup. Same servers run perfectly ok Ubuntu ...
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83 views

Ethernet networking issues 14.04

I'm having some real trouble configuring my network in ubuntu server 14.04, I installed using (MAAS) and dhcp configuration hasn't worked, so I continued manually. The problem I'm having is that Eth0 ...
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20 views

Some sites wont load ubuntu 14.04

I'm using a dsl connection with static ip.Some sites are not working on ubuntu but they are working on windows on the same machine with the same connection.They keep on loading.I also noticed that ...
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1answer
2k views

Connect to checkpoint VPN with Ubuntu 13.10

My company uses a couple of Checkpoint VPN's. With my Windows laptop I use Endpoint Security to connect. For our corporate VPN I can use the SNX client in Ubuntu to connect. However we also have a ...
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1answer
8 views

isc-dhcp for Virtual Machines only

I installed Xen 4.3 on Ubuntu Server 14.04 and added the xenbr0 bridge. The host IP is 145.173.136.2. The network administrator reserved 15 IP's for the VMs: 145.173.136.112-126 So i installed the ...
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How to send data through two different PPP connection

I have two Point to Point[ppp0 and ppp1] interfaces in my Ubuntu system. How do I send data through each interface. Presently I am able to send through only once interface. # route -n Kernel IP ...
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3answers
3k views

Connected to wireless, but no internet access

After installing Ubuntu 12.04 a week ago wireless internet had been working fine. It stopped working yesterday, however, and I'm at a loss for what to do even after scouring replies to similar posted ...
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1answer
23 views

ubuntu server not seeing ethernet port

i am trying to setup ubuntu server on a normal desktop computer. the install went fine (even though it didnt connect to the internet) i figured i would have to change some network config settings. but ...
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23 views

WiFi connection drops every few minutes

I'm running kubuntu 13.10/Linux 3.11.0-2. Every 10-20 minutes, my network connection completely stops, with nothing transmitted or received, but after a while it just comes back. during these drops, ...
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What is the cni0 interface seen on ifconfig

What does the cni0 interface denote? cni0 Link encap:Ethernet HWaddr 00:50:F1:80:00:00 UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:3 errors:0 dropped:0 ...
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7 views

Connect Ubuntu Server to L2TP over IPSec Server

I have an application running on an Ubuntu Server. It needs to connect to a remote SQL server to collect data for the application. The remote server is behind a firewall device that is running an ...
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2answers
15k views

How do I change / spoof my MAC address and easily switch between multiple ones?

My router can do port-forwarding based on MAC addresses. That is, a specific MAC will get a specific IP, for which I can configure a set of ports to be forwarded. In order to easily change that set of ...
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TP-Link TLWN725N V2 low signal

I'm using Lubuntu 14.04 - 64 bit, kernel 3.13.0-24-generic. My TPlink, is always with low signal(normally 2%). The other computers are working just fine with other wireless pens, with good quality ...
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1answer
17 views

how to open port to the world

I have installed postgresql (or any other service for that matter) on ubuntu 14.04.1.LTS I can start postgres and it is running. It accepts connections on port 5432. This is my netstat output: tcp ...
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IRQ Balancing-RSS-Flow affinity

I am playing with a multi-core system, in which i would like to get maximum ip packet forwarding performance.I am getting 1.2Mpps with Ubuntu 14.04, with new ixgbe driver. But when i am allocating ...
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Wrong throughput measruements in VBox VM running Ubuntu 12.04.3

I have one physical machine with Linux Ubuntu System (Host OS) installed on it. Besides that, the machine runs one Virtual Machine (VM) and one Open vSwitch Bridge. The machine has one virtual ...
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15 views

Problems with Network Manager in Trusty

I have Xubuntu Trusty on a Samsung laptop and have multiple issues with network manager. First it may stop connecting to any wireless network at all (it tries and fails). This happens after I turn ...