Managing and using network connectivity on a Ubuntu system

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Ubuntu server DNS issue

Hello guys I seem to be having issues with my Ubuntu server not being able to sudo apt-get update that it does not pick up on the update files. I have changed the DNS to Google's which allows me to ...
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Login loop in Ubuntu 14.04 LTS after last updates

After the last Ubuntu 14.04 LTS update, the login was showing a guest account looping though none was created. I solved this by creating the 50-no-guest.conf. But now, though my passwords are good, it ...
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Unable to connect to Photon plus Huawei in Ubuntu 14.04 after update

I have been unable to connect to internet using my photon plus Huawei device. I had been using this device earlier without any issues. Maybe some system update or system shutdown without disconnecting ...
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Ubuntu 14.04 as router Destination Network unreachable

I am fightning with this for like 10 days now i really need to ask you guys, i hope someone has 5 mins time to explain me what i am doing wrong! For the start i wanted to configurate a router for my ...
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Brother DCP-7065DN, Ubuntu 14.04 64bit: Cannot print to network printer but can use the scan function (via simple scan.)

I have followed all suggestions mentioned in "Brother DCP-7065DN, Ubuntu 14.04 64bit: Can print to network printer but cannot use the scan function." I have the opposite (can/cannot) situation for ...
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Set the TCP window scaling option to 4 & the TCP window size to 65535

want that all TCP packet sent by my machine (linux system) should be sent with the TCP window scaling option set to 4 & the TCP window size set to 65535 (0xffff). How I can configuyre my linux ...
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Automatically connect to internet

I have Ubuntu 14.04 LTS installed on my laptop, I am using 3G USB modem to connect to the internet (sometimes I do not have direct access to this laptop, but I need it to stay online). But every day ...
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Why My ZTC Grameenphone internet 3g is mount failed?

My ubuntu version is ubuntu 14.04 lts. When I'm plug in the device then following massage are show: Error mounting /dev/sr1 at /media/mohammad/GP Internet: Command-line `mount -t "iso9660" -o ...
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Openvpn with network-manager

So I've been trying to setup openvpn with my VPS like this: Raspi: provides route to home lan. Have set up routes on router already. Laptop: use when out and about by connecting to vps via openvpn ...
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27 views

How to connect to a LXC container from the LAN?

I have a server with the latest Ubuntu server 64-bit install in my home wlan. I use ssh to connect to it from my laptop. The server /etc/network/interfaces file: # The loopback network interface ...
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isc-dhcp-server: dhcp dynamically update dns records

i'm trying to dynamically update DNS records when DHCP give out addresses. but even though I have specified allow-update with a key in /etc/bind/named.conf.local and specified the same key in ...
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Preventing port scanning

I want to prevent my server from being port scanning from Internet and if port scanning occurs, block source IP address for several minutes. Below my current iptables config: Lilith> iptables ...
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“No network devices available” Ubuntu 14.04

I'm new to the Ubuntu community, so please, give a step-by-step answer if possible. Everything was fine, until my battery became critically low and my computer turned off. After charging and turning ...
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Ubuntu 15.04 Vivid network-manager causes kernel panic on Lenovo G505s [on hold]

I had Ubuntu 14.10 installed on my Lenovo G505s and I upgraded to Ubuntu 15.04 in February this year (to the beta release). A few weeks ago, I updated my installation with new packages. From that ...
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strange, random Wifi connection problems with 14.04

I frequently have problems to connect to my wifi from either my laptop and my desktop computer. Both machines run with Ubuntu 14.04. Sometimes I am just not able to connect to the wifi and the only ...
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25 views

Reset DHCP IPs to beginning of range

Kind of a silly question, but I'm just curious as to how you'd reset the DHCP range of your server back to the beginning of it's designation. I've tried restarting the DHCP service, but to no avail. ...
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37 views

Ubuntu linking two wireless networks and sharing internet connexion

I must at first say that I'm a total noob regarding networking. I have two wifi adapters (wlan0 and wlan1). wlan0 is connected to a wireless router that is not connected to internet. wlan1 (a long ...
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Ubuntu 14.10 Wifi drops to 0 B/s

I have Ubuntu 14.10 installed and if I connect to a network (with Wifi) first everything works great with good transferring rates. However after some time (few minutes, sometimes longer) the ...
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Can't mount samba shares

I'm trying to setup some samba shares in 14.04. After defining the shares, I can connect and also list the defined shares, but when I try to mount a share, I get the error: NT_STATUS_ACCESS_DENIED ...
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Network folder access

I am new to Linux so there are quite few tasks that are new to me. First I am using DSL connection and wire is connected to wireless router and that is how we connect to internet at home. But if I ...
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Basic Network Routing Question

I guess this is a very basic (dumb) question about routing. If I specify a route do I need to worry about a return path or does that also need to be specified? For example I have a WiFi hotspot on ...
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Dnsmasq and Iptables for routing

I'm using a Raspberry Pi with two ethernet ports as a router. The network looks like this. "Internet" <--(…)--> Fritz!Box <--(172.16.x.y)--> [eth1, dhcp] Raspberry Pi [eth0, static] ...
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How to connect a Handycam through WiFi or NFC to Ubuntu device to share content?

I have a Sony Handycam device with Built in Wifi and NFC. And I want to connect it to my computer without using the USB cable. And so I would like to use the default NFC or WiFi feature in my camera. ...
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SOLVED HP 15-r212nl Wifi random disconnect on Ubuntu 14.04 LTS

SOLUTION: echo "options rtl8723be fwlps=0 swlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf after this, REBOT. after a short delay (that can be 5 or 30 min) the internet connection (WiFi) stop work ...
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How to configure promiscuous mode rejected in KVM bridge?

I am using Ubuntu 14.04 (3.13.0-45-generic #74-Ubuntu SMP) as Host OS. KVM version 2.0.0 I have disabled promiscuous mode in guest Virtual Interfaces along with corresponding host vnet & bridge ...
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can't get WiFi connected on new Lenovo w 14.04

Just bought a Lenovo laptop and can't get WiFi connected. It can see my network SSID, but any attempt to connect gives wlan0: authenticate with 90:ef... wlan0: send auth to 90:ef... wlan0: ...
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55 views

Ethernet Problems - Realtek RTL8101E/RTL8102E

This problem has been going on for a few months now. After failed troubleshooting (time and again), I'm finally giving in, and asking you for help. I would like to prefix this by saying that Ubuntu is ...
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33 views

beyond MAC address spoofing

Saturday, I am going to have to attempt to connect my notebook to a network that does not like me much. It is a school network. I work there as a volunteer, but don't have a sysadmin to explain what ...
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Ubuntu MATE 14.04 LTSP Problems

I've come across a problem where I have gone through a read-me verbatim, and although it works fine, every time I reboot my system (Virtualbox in this matter), the IP address changes even though I ...
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32 views

How to know if the router is internet access when connecting via wireless

In windows when you are connecting via wireless it's tell you if their is internet access or no. in ubuntu i already connect to router but i don't know if the router is connect to internet or not?! ...
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Configure connection sharing with specific IP Address

Edit - a more concise version of the question: When using connection sharing, I want network manager to use the 192.168.254 subnet instead of the 10.42.0 subnet. Is this possible? Background: I ...
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Raspberry Pi 2 Model B Ubuntu 14.04 LTS, How to connect to the network?

I am a newer to raspberry pi and to Ubuntu. I want to install Ubuntu on the Raspberry Pi 2 Model B. But I found that Ubuntu for the Raspberry Pi is a minimal ubuntu-standard version without GUI. I ...
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Internet Connected but cannot visit websites

My laptop is Elitebook 745 G2 running Ubuntu 14.04, new installed. It has dual OS: Ubuntu and Windows. The internet service works well in Windows, but cannot work in Ubuntu, though it is connected and ...
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Internet connection problem for zte MF-193A on ubuntu 13.04 [on hold]

I am from bangladesh. I have a great problem. I have a ZTE MF-193A gsm modem.I connect it with it's won Driver softwere.But Mozilla use internet but softawer center and terminal don't use internet. my ...
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1answer
31 views

What is the relationship between sockets and ports?

I am trying to understand the relationship between sockets and ports. I found that a socket is part of a port and it handles communication for that port. However, on another blog I read Os does ...
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Accessing network drive (NAS) on my Ubuntu Phone Aquaris 4.5

I would like to acces my network drive (NAS) which is shared over my home LAN in my Ubuntu Phone Aquaris 4.5. When opening the File Manager on the phone and sliding the Places panel, I only have ...
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EVE Application and APIs are not accessible from a different same network machine

I have an EVE {http://python-eve.org/} Application exposing some of the APIs for an android application that I am writing . The Eve application is working fine when I am accessing the APIS locally on ...
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Share internet from PC to unrooted android smart phone connected via USB cable

I am running Ubuntu 14.04 LTS with Windows 7 Dual boot (both 32 bit) in my desktop. I use cable broadband (Ethernet). I have an unrooted android smart phone running KitKat 4.4.2. This device has a ...
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Web service only responding to local request

I have a webservice that listen on port 5678 on a remote ubuntu machine. netstats: tcp 0 0 0.0.0.0:5678 0.0.0.0:* LISTEN 10605/node I don't have any ...
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What layer(s) in network stack does WICD or gnome Network Manager manage?

Does WICD or gnome Network Manager manage what layer(s) in network stack: application layer transport layer network layer link layer physical layer My guess is the answer includes network layer, ...
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22 views

KVM Bridging - Network connection fails if I change Device model to VirtIO from rtl8139

I'm setting up my first VM and am using bridging to access my network. It's a Windows7 VM on Ubuntu 14.10. I read that changing to 'Device Model = VirtIO' in the definition of the VM will improve ...
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USB stick breaks the network access

Recently I've got a brand new Sandisk Extreme usb stick. It contains a NTFS file system and a encrypted NTFS folder that I can read/write on a Windows machine without issues. But when I plug it into ...
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20 views

configure networkmanager to share internet

I am connected to a WiFi Network with my laptop, now I would like to connect another device at my LAN port, so it can also use the internet connection I got over Wifi How can I configure this in my ...
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Possible to let virtualbox guest OS to use some device directly?

My host OS is Ubuntu 14.04 running on Thinkpad T400, and my guest OS by virtualbox is Windows 8.1. Sometimes my Ubuntu disconnect itself from wireless or wired networks and disable the wireless (and ...
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Ubuntu shows “resolving host” but Android is able to instantly access internet on the same network

I am connected to my home wifi network. I have this constant problem with my laptop which runs Ubuntu 14.04 currently. Very often, while accessing the internet, I can see the web pages timing out or ...
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I cannot connect to WIFI network due to 'missing CA certificate'

I have a Samsung laptop with built-in wifi capabilities but when attempting to connect to my university's wifi I am suddenly unable to do so. I apparently don't have a CA certificate though I have ...
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HP Compaq 6910p no wireless network [duplicate]

Im new to Ubuntu, im have instaled ubuntu in my hp hstnn-c31c - HP Compaq 6910p I canot put the wireless network to work, a driver problem i supose. I have tried lspci | grep -i net The result ...
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How to copy a single same same file in all active ips in LAN

Please suggest me how to copy a single same file to all active IP addresses in LAN, same user and same passwords in all hosts.
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Frequent wifi disconnection on ubuntu 14.04 LTS

I have recenty installed ubuntu 14.04 LTS 64 bit. My university provides cyberoam wifi connection. After 5 seconds to 1 minute, internet stops working and then wifi disconnects. I have to disable wifi ...
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1answer
28 views

How to check Active Linux machines in LAN [on hold]

How to check Active Linux machines in LAN.In ubuntu 12.04. Anyone knows please suggest me.