Managing and using network connectivity on a Ubuntu system

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After setting up pre/post-routing, why is my port forwarding still now working?

I am set up with 3 virtual machines - a gateway, server, and client. We are tasked with setting up iptables on the Gateway to forward HTTP, SSH, and FTP traffic from the Client to the Gateway to the ...
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Wireless not working ( realtek RTL8191SE )

The card worked fine in windows 7. The realtek RTL8191SE wireless card won't work in ubuntu 14.04. It does show up in networks, but i can't turn it on. When i try press the: Turn on wifi in ...
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Ubuntu 14.04: How to send email without registering a domain or having an MX or A record?

Ubuntu 14.04 on a virtual machine that is not my PC. I use my PC (Windows 7 and Putty 0.63) to shell into it. Uname=Linux ubuntucomp 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 ...
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How do I block all traffic except firefox?

Lets say for example I want to block all traffic except incoming from nginx, outgoing for firefox and allow out and incoming to some torrent client. Would that be possible? I took a look at apparmor ...
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ubuntu 14.04 routing between 3 networks

I would like to get some assistance setting up routing. I have an ubuntu server 14.04 with 3 nics. configuration as follows: 192.168.1.0/24 dev eth2 proto kernel scope link src 192.168.1.1 ...
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Nautilus does not start when network connection is down

Nautilus does not start when network connection is down. I have some network shares (sftp://. . . . . ) bookmarked in Nautilus. If the network connection is down, Nautilus will not open. Is there a ...
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Ubuntu 13.4 unable to load application from hard wired connection [on hold]

Installed Ubuntu 13.04. Network connection is wired. When loading an application from "Universe" (no other choice is shown), arrows "circle" in banner for 2 or 3 seconds then stop. Error message pops ...
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10 views

3.13.0-37-generic basic router repeatable issue - packet loss

I have two desktop PCs and I wish to use them as a simple router between two LAN segments. I am not using NAT, SNAT, DNAT, and all my iptables tables/chains policy are ACCEPT. With iptables wide open ...
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23 views

How may I do a SSH tunneling?

After reading an article about how cool can SSH be, I tried the solution given there about tunneling your connection. This is the very first time I try this. I've opened a terminal and typed: ssh ...
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Touchpad and wireless network connection

Sir i have purchased a laptop Dell Inspiron 14 3000 series. and install ubuntu 12.04 on it. After installation the Touchpad input device is not working. I have tried to connect to wireless network of ...
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Routing traffic to certain IPs over wlan0

How can I route traffic to certain IPs over wlan0? I have an ethernet (eth0) and a WLAN (wlan0) card in my computer. I want all traffic but the traffic to certain IPs to go through eth0. For a list ...
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no wireless connection on ubuntu 14.04 of my ASUS laptop

Here are the information about wireless on my laptop. Thanks in advance. #### wireless info START Report from: 21 Oct 2014 15:20 WST +0800 Booted last: 21 Oct 2014 15:01 WST +0800 Script from: 20 ...
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29 views

WiFi networks appears be far away in spite of the router being close by

I recently installed Ubuntu 14.04 and I'm facing a little inconvenience. The WiFi networks appears as if it is very far, when, in reality, the router is near the laptop. In case of Windows (on the ...
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25 views

Problem with wifi on ubuntu 14.04

I installed a new hard drive and ubuntu 14.04 LTS i386 on an older Dell Inspiron 9300, in August 2014. Wifi worked fine for a couple of months. Several weeks ago, after running some ubuntu ...
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Ubuntu 14.04 upgrade wired ethernet slow

I have upgraded to 14.04 and am experiencing slow wired ethernet connection. Windows 7 pc wireless connection receives 8Mbs Ubuntu 14.04 LTS 1-2Mbs Only started after upgrade. Ethernet details: ...
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nfs ver3 unworkable using new managed switch - no idea why - LLDP breaks portmap

I spent 3 nights and part of days, googling and reconfiguring servers of home network with two nfs vers=3 servers that suddenly stopped working. They were working with zero issues using automount ...
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40 views

How to setup wifi network

I'm a new Ubuntu user, i've installed Ubuntu 14.04.1 LTS on my laptop (ASUS) and the ethernet connection works with no problems. The problem is, I can't connect to any wifi connection and i can't see ...
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Can not connect to ethernet, only VPN is visible

I am new to Ubuntu. I have installed Ubuntu on my computer, and now I am not getting ethernet (trying to connect wired connection) option in my network manager. VPN is the only option that is visible. ...
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How can I record all URL and IP outgoing traffic on my computer so I can see what people are up too

I'm trying to get a list of all outgoing URL traffic that my computer makes. This way I can know what my computer is making a request for. Like for email or web browsing or the unity searching the ...
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1answer
18 views

burp: The proxy server is refusing connections from another computer

Ubuntu 12.04.5 LTS (Precise) 32-bit desktop. I have installed burp (an intercepting Proxy), and it works for programs run from the same computer, but when I try to connect from another computer on ...
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27 views

Error message when I want to connect to VPN gate

When I want to connect to vpn gate ,I get "vpn network service start failed" in Chinese,and syslog get msg like this Oct 20 13:28:15 sura-K55DR NetworkManager[1249]: <warn> nl_recvmsgs() error: ...
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Ubuntu Touch doesn't connect to open WiFi

I brought my Nexus 7 (2013) running Ubuntu Touch to a coffee shop today. I was unable to get it to connect to the open WiFi there. The same Nexus 7 happily connects to my home WiFi, which uses WPA2 ...
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25 views

Ethernet and wifi are gone

Just rebooted an HP SpectreXT netbook after a Kubuntu update and there's no more network access. ifconfig only shows 'lo'. In the network manager I cannot turn on wifi. The ethernet cable is connected ...
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Network Manager unexpectedly disconnecting from wireless

lspci: Oct 19 13:49:57 linux NetworkManager[850]: <info> NetworkManager state is now CONNECTED_GLOBAL Oct 19 13:49:57 linux NetworkManager[850]: <info> Policy set 'ECURB' (wlan0) as ...
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Ubuntu 14.04 'takes over' wireless Brother printer

I have this weird problem with my Brother dcp-J552dw printer. I have installed drivers for Ubuntu 14.04 in my laptop and everything is working properly (the connection is wireless). Also, there are ...
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29 views

Connecting 14.04 to Windows 8.1

I have a machine with 14.04 and a Windows 8.1. They are connected to a gigabit router. Both are connected to a VPN. The Windows machine is able to see the Linux machine and copy files to it. The ...
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Slow ethernet in Ubuntu 14.04

I upgraded from Ubuntu 12.04 to 14:04 and everything works well except for Ethernet connection. I can connect to the internet but the connection is extremely slow. Any idea what might be wrong? Below ...
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Tata Photon + is not starting up,Why this? [on hold]

I'm bored while operating these OS, it's seems very hard.Not understanding anything what to do?
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18 views

Create wirless interface?

i want to create an wirless interface using iw. sudo iw dev wlan0 interface add wlan1 type station after when i look at ifconfig -a there is: eth0 Link encap:Ethernet HWaddr ...
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How to remove all network connections?

I have collected a lot of network connections over time. When I go to Network menu in topbar, and to Edit, the Edit Connections dialog shows just one out of three connections. The other two are not ...
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Broadcom driver not working after HDD install

Complete Newby here.....I download and copied the latest version to a USB stick. When it booted I went to sytems/software and it automatically found my broadcom network card and I could install the ...
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WIFI PEAP frequently disconnecting

I'm experiencing frequent and random disconnections under my university wifi. I'm using a PEAP security protocol and I set everything correctly but I can't stop getting disconnected. I tried with a ...
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telnet: Unable to connect to remote host: Network is unreachable

I am not able to connect to gmail with telnet using any of the ports. I am using this command: telnet smtp.gmail.com 25 and it gives following error: Trying 74.125.68.108... Trying ...
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Lubuntu 14.04 wifi disabled (greyed out)

I have an ASUS-eee 900 which I recently started using as a network server with Lubuntu 14.04. I've added two 32Gb USB thumbdrives for this. All was running OK for the last two weeks, when suddenly ...
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Connection to tor network and proxy server fails after vpn connection or running a local server

I am on Ubuntu 14.04. I am facing this weird issue which I never faced before. I am a university student. I have multiple proxy servers to which I connect for internet. Everything works fine when I am ...
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static ip address in ubuntu 14.04TLC does not work [on hold]

If you are reading this you are probably banging your head against a wall because your linux box is not resolving dns requests. It might appear to be hanging. You do not need to change ...
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12 views

Routing particular services over VPN

Running Ubuntu 14.04 LTS. I need to connect to a SMB share that isn't local. The only way I can connect to it is over a VPN. The particular VPN service is Juniper. Connecting to the VPN is easy and ...
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27 views

Samba will not accept my password

I have recently done a fresh install of Ubuntu 14.04lts. samba is installed and I can see the computers in my workgroup. I was able to transfer files from a Windows XP computer on my workgroup ...
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21 views

wlan0 is missing, shows lo instead (14.04)

I've tried all the solutions I've found on the internet but none of them have worked. In my laptop, I have a Realtek RTL8723AE wireless card. It was not getting consistent connections, so I was ...
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Can't access internet via ad hoc in Ubuntu 14.04

I've got very weird situation. I have PC with ethernet and wireless. On PC I've created ad hoc network in Ubuntu 14.04, and I'm trying to connect it with my laptop Ubuntu 14.04. What is weird: ...
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Wlan0 missing after taking ownership of VM due to suspended session

I'm using Ubuntu for about a month and, after installing it, I configured my internet connection on /etc/network/interfaces to # interfaces(5) file used by ifup(8) and ifdown(8) auto eth0 iface eth0 ...
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Unable to access Windows share from Ubuntu 14.04

I can access a Windows network drive on different domain on windows using Windows + r, typing \\servername and authenticating myself using my credentials on the domain using domain\username and ...
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why do all bad hostnames resolve to 198.105.254.23?

I'm running 14.04 on a desktop and laptop connected to a DSL router and am unable to get any of the internal hostnames to resolve correctly. When I dig desktopname: ; <<>> DiG ...
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VSFTPD Passive mode picking random ports

I'm trying to set up an FTP server behind a TP-Link TL-R470T+ router. I have set up port forwarding of port 21 and ports 6000-7000. This is the relevant section of my vsftpd.conf pasv_enable=Yes ...
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Command to measure SNR ratio on an ad-hoc network

I'm working on a project with Ubuntu 14.04 where I need to connect multiple Ubuntu devices on an ad-hoc network and measure the SNR ratio. I'm using the TP-LINK TL-WN7200ND USB wireless adaptors for ...
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40 views

Juju Bare Metal 14.04 behind proxy ignoring proxy settings

I have installed Juju on my MAAS server (Ubuntu 14.04 LTS) and provided the following environment.yaml (debug output attached): http://pastebin.com/a02LnNbw When I run juju anything (bootstrap, ...
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PCI-Express wireless card causing issues

Since I installed the TP-LINK TL-WN881ND 300MBPS WIRELESS N PCI EXPRESS ADAPTER I've experienced several issues. The keyboard gets disconected at random intervals, the mouse sort-of loses power (the ...
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24 views

ftp download using LWP::UserAgent failing

I am a noob with ubuntu and was trying to download some files from a ftp server. Home PC with Ubuntu 14.04 connecting to internet through a router. The code I am using is # Program to download ...
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hardware info of computers in a lan

Need your support for a simple problem. I need to know all the hardware info of the computers connected to my LAN. Is there any way to do that via LAN, without having to ssh to each system?
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Connect to WAP using WPS

Is it posibble to connect to a Wi-Fi AP through WPS? I have followed this other question How to connect to Wi-Fi through WPS?, but haven't had any luck at getting it working