Managing and using network connectivity on a Ubuntu system

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How do I set up a firewall/iptables using rc.firewall?

I am new to Ubuntu and am having a bit of trouble getting my firewall set up for my Network Security class. We are set up with 3 virtual machines - a Gateway, a Server, and a Client. We are supposed ...
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2answers
6k views

Computer automatically disconnects from wifi: I have to restart to get back online [duplicate]

My Lenovo Ideapad G50-70 will automatically disconnect from the Internet at random moments on 14.04. The network will first just stop working without any warning, and after a while, it will disconnect ...
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0answers
4k views

UFW for OpenVPN

I want to configure ufw (uncomplicated firewall) for OpenVPN. Connections are only allowed through OpenVPN. Everything else should be blocked. So if OpenVPN is disconnected -> no internet! I found ...
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1answer
2k views

USB 3.0 port not detecting USB modem

I have HP 250 G2 laptop with Windows 7 and Ubuntu 14.04 (dual-boot). The laptop has USB 2.0 ports and one USB 3.0 port. I am using USB 3G mobile broadband modem (Huawei K4201), which is working ...
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1answer
27 views

Updated some VM's from 12 LTS to 14.04.1 LTS, and now network throughput is bad, any ideas?

I decided to bite the bullet after seeing the messages about going to 14, and ran the upgrade scripts. This all seemed to go well, so I kept going and updated all 3 of my VM's that are running Ubuntu ...
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1answer
155 views

TWC arris cable modem. browse but no port forward

I have am arris cable modem tg1672g62. i'm running ubuntu 12.04 lts Genuine Intel® CPU 585 @ 2.16GHz 32 bit. i connect to firmware by typing 192.168.100.1:8080 in theory it should be 192.168.0.1 i ...
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0answers
33 views

No 'wlan0' on 14.04.1 LTS [duplicate]

Just installed Ubuntu 14.04.1 LTS 32bit on my "mature" Asus X50R laptop. Basically working fine and I'm using it to write this post, with a wired network. However wireless doesn't work. The ...
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2answers
3k views

Share Internet Connection via Ethernet connected Router over the LAN

I have a USB modem that works perfectly with Ubuntu but doesn't work with my Wifi router. I want a set-up where the USB modem is connected to my PC and my PC is connected to my Router (via ethernet) ...
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1answer
30 views

Ubuntu Server/Network Advice [duplicate]

What I basically want to is make so that any one of my family members can log on at any of our Pc/Laptops and still assess their files. I know kinda of know what to do but not completely. Would this ...
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1answer
1k views

How to set up ssh on a lubuntu vm (VirtualBox) and windows host

I've set up a Lubuntu vm using VirtualBox on my Windows 8 desktop and I want to connect my laptop, which is dual-booted with Windows 8 and Ubuntu, to the Lubuntu vm via SSH. I've gotten as far as ...
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0answers
119 views

Ubuntu 12.04 LTS disconnect from Wifi when another device connect

Novice Ubuntu user here. I have a very strange problem. I have a wireless connection at home. At one time there could be 3 machines that are connected using wireless (Windows 7 laptop, Window XP ...
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6answers
20k views

How do I keep my Wifi from dropping out?

I have a System76 Gazelle, gapz8, running Ubuntu 14.04. My wifi keeps dropping out at random intervals. I have a new router, so I don't believe that's the issue, but I am in an apartment building, so ...
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2answers
252 views

Can not get two Ubuntu 14.04 computers to work via Samba

First, I am using Samba because, though primary computers are Ubuntu 14.04, I have Windows laptops. These laptops should gain read access to the primary database. The primary database is on my "...
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2answers
6k views

Ethernet connection not working in ubuntu 14.04.1 LTS

I am facing weird issue with my ethernet connection. Its showing connected but when I hit something in the browser it won't though its connecting via wifi to other networks but not with the wired ...
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1answer
2k views

Unable to browse internet in Genymotion via VM

I have installed Oracle VirtualBox and Genymotion.. I installed Google Nexus using Geymotion inside the VM. I have ethernet LAN networking in my hostel, but I can't connect Google Nexus VM to the ...
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1answer
446 views

Host-only network on Ubuntu 14.04 [VBox on W7]

So, I'm running Ubuntu 14.04 on VirtualBox. I'm trying to set a host-only by checking my "virtual" IP on my host's browser and access the index_html on Ubuntu, but it is not working. Here's what I ...
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1answer
404 views

Share Internet from laptop (connected to LAN) to Android using WIFI router

The idea is: Internet - eth0 - Laptop - wlan0 - router - Android Static IPs everywhere. IP ranges are different. Could not establish bridge. bridge-utils unable to add wlan0 to bridge. Android doesn'...
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1answer
1k views

ufw not blocking traffic

I have an apache2.4 webserver, and I am trying to block a malicious subnet using ufw. Here is the UFW setup: $ sudo ufw status verbose Status: active Logging: on (low) Default: deny (incoming), ...
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1answer
69 views

Is it possible to limit NetworkManager to a set of named interfaces?

NetworkManager is great for managing my wireless device, but I don't want it touching the virtual devices I create for network experiments (which I use with VMs or containers). I'd really like a way ...
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0answers
495 views

How to trick android and ios devices into thinking they are connected to the internet

I have an ubuntu machine setup as an access point, but it is not connected to the internet. I simply want to transfer data between it and smart phones. The problem is, all devices seem to want to ...
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1answer
127 views

What DNS server is bind using?

I installed Bind9 in 14.04.1 and made no config changes, I did not touch any files in /etc. This means my laptop is a caching DNS server. My questions are: where is bind getting it's DNS? What ...
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2answers
670 views

Wirless Connection Keep Dropping Randomly

I have Ubuntu 14.04.1 Installed on a Dell Inspiron N5110 laptop I'm connected to internet through a wirless adapter, the problem is when i'm connected I suddenly lose internet connection while I am ...
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1answer
124 views

Wireless networking continuously in “connecting” state after Suspend

Ubuntu 14.04 I've searched extensively for a similar issue, the closest I can find is where the output for nmcli nm returns "sleep" for the "state" key. However, my output (when the problem starts) ...
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1answer
232 views

How To: Keep running script only when the network (internet connection) is idle?

I have a script (actually, a Rails application with a Sidekiq job queue system), which uploads pictures and albums to Flickr. This data is huge for my purposes (around 100GB), and the upload is slow ...
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1answer
73 views

Ubuntu 14.04 'sudo' and networking not working

I upgraded to Ubuntu 14.04 today and I have two problems 1) When ever i do 'sudo' followed by a command the system just stalls, nothing from 'sudo ls' to 'sudo apt-get install ... ' etc works. The ...
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2answers
110 views

Failure to fetch http://somesite.com could not resolve somesite.com

I am changing my Unbuntu server from dhcp to static ip address. I haved added the following to the /etc/network/interfaces auto eth0 iface eth0 inet static address 120.120.120.120 netmask 225....
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2answers
5k views

DNS issues with my ubuntu 14.04

I just switched to Ubuntu 14.0.4 from Windows 7 using dual boot mode. I am connecting to my office's network using wireless wlan0. I am experiencing issues when trying to ssh to access several Linux ...
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1answer
1k views

Restrict the client access to a Plex Media Server to user specified IP addresses

To play videos from my computer on my television I am using Plex Media Server. Unfortunately, with Plex Media Server running, any device on my LAN can access this DLNA server. I want to restrict the ...
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1answer
242 views

Is it possible to get VM guest ip in Nat network virtualbox

I am having virtualbox VM in which Guest addition is install i can get VM ip by below command VBoxManage guestproperty get "vm-name" "/VirtualBox/GuestInfo/Net/0/V4/IP" But, I want to get guest IP ...
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0answers
391 views

Network, usb and unity not working after upgrade to 14.04

I had a dual boot with Ubuntu 12.04 and Windows 7. My update manager started to do weird things a while ago. It didn't get any new updates and it crashed a thousand times when I clicked on "upgrade ...
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3answers
15k views

List of available wi-fi networks does not show up. Just 'Add' button

Here's the screenshot. It just has 'Add' button, where I have to manually set up wifi (ssid etc). I want to click on Wi-Fi symbol at top right corner and see the list of available networks. How do ...
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1answer
2k views

VPN PPTP disconnects after a random period of time

I can't seem to keep my VPN connection alive. I'm using Ubuntu 14.04 64bit on a Toshiba Protege R30-A-17E. The VPN connection just dies out after a random period of time no matter if I'm using it or ...
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1answer
86 views

Command to display virtualbox vm network information

I am having two VMs VM1 and VM2 i want to attach same network of VM1 to VM2. For that i want to displaying virtualbox VM network information and parse the output. And then attach same network to VM2. ...
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1answer
6k views

Network Manager doesn't have option of enable mobile broadband after upgrading 14.04 to latest linux image

Earlier mobile broadband connection seems to work flawlessly but after Upgrading trusty tahr 14.04.1 to linux image 3.13.0-35 there seems to be problem. First it started popping for USB modem ...
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1answer
90 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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3answers
525 views

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
70 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 bc:5f:...
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411 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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2answers
288 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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0answers
333 views

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
175 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
2k views

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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2answers
4k 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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1answer
234 views

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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1answer
640 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 14....
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1answer
154 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
80 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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1answer
612 views

How do I set a static IP on my Virtual Server?

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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82 views

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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987 views

TP-Link TLWN725N V2 low signal

I'm using Lubuntu 15.04 - 64 bit, kernel 3.19.0-18-generic. My TPlink, is always with low signal(normally 2%). The other computers are working just fine with other wireless pens, with good quality ...