Managing and using network connectivity on a Ubuntu system

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PING flooding option

I have been reading up on common ways in which people attack each other on the internet through things like DDOS attacks etc, and how one would defend oneself from such attacks, and I have come across ...
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1answer
12 views

Ubuntu keeps asking for Wifi password

I've recently installed the latest version of Ubuntu (64 bit), alongside my Windows 8 dual booted machine. The problem I'm having is trying to connect to my school network, the school uses a username ...
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Route only traffic on specific port through VPN

I would like to route only traffic on a specific Port. In my case for torrents through a VPN. For Transmission the port is 51413 I think. I only found tutorials how to set this up on a router but I ...
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1answer
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Porting WiFi network from NetworkManager to /etc/network/interfaces

I'm trying to move a WiFi network configuration from NetworkManager to static configuration in /etc/network/interfaces. The fully working NetworkManager configuration that I have right now is: ...
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Network disconnect option grayed out

With the latest updates I've received for my Ubuntu 12.04 64-bit machine, I am no longer able to select the "Disconnect" option when I use the drop-down menu under the connectivity task tray icon. ...
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using sctp_recvmsg is the best? How?

I have just started with sctp and wrote my first program with it. I chose one-to-many communication style. Mainly I did things according to RFC 6458. (I used other source as well, but mainly I was ...
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Connect to remote Ubuntu Server GUI

I have a server running remotely by ip address 5.231.XX.XXX running Ubuntu 13.10 Operating system. I am using Ubuntu 14.04 on my laptop. I am able to connect to my server via terminal by ssh login ...
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Sniffer: Request ARP

I need your help. How can I detect if there are several ARP REQUEST coming from the same machine "sniffer" in my local network, I need a source code example in python and not tools. thanks,
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Can't connect to Internet via D-Link Dir-600 Router on Ubunto 14.10

I recently installed Ubunto 14.10 and have trouble accessing the internet with my current network setup at home. (Cisco EPC2308G Moden - D-Link DIR-600 Router - Samsung R540 Laptop) I can access the ...
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Access a file on a remote Ubuntu machine using Java

From java running on Windows, I need to access a file on a remote Ubuntu machine. I use the following: URL U = new URL ( "http://" + SERVER_IP + ":" + SERVER_PORT + "/" + ClsName + ".class" ); ...
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Network failure when booting with network cable plugged

I now ran into this problem with my laptop. I can't establish an ethernet connection when I boot the system with network cable on. However, when I boot with network cable unplugged but connect it ...
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Ubuntu loses network connection and dpms becomes re-enabled after unplugging AC adapter on Macbook Pro

On Ubuntu 14.01, when I unplug my AC adapter, the network connection is lost (even with connected to wired via eth0). Also, the dpms settings are lost. So even though I run "xset -dpms", that setting ...
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Why can't MAAS VM Node Commission properly

My issue appears to be with the MAAS Proxy. I used Ian Zoratti's VirtualBox extensions link to his GitHub site so that the MAAS Cluster Controller is able to start up the VM properly and pushes the ...
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20 views

Why can't I access my Ubumtu box on my LAN?

I can definitely access the external internet... via ping, wget, apt-get install, web browser..., but for some reason, I cannot ssh to my 14.04 server or ping it or or access any of the web sites i'm ...
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32 views

No coffee shop WiFi for just me

I am currently in a coffee shop I frequent regularly and I am finally fed up with my issue. Some how I am the only one in the entire building that cannot use their WiFi. I see OSX and Windows ...
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iptables - redirect DNS queries

I already have the following iptables rules applied in order to masq all of the wlan1 traffic through wlan0. *filter :INPUT ACCEPT [48:6144] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [47:6078] -A INPUT -i ...
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N WiFi Adapter only working in G mode

So, I have a PC running Ubuntu 64-bit in my bedroom, and I am trying to use the onboard WiFi (Broadcom 43228 802.11a/b/g/n) to connect to the router which is 2 floors down on the ground floor. The ...
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Not reaching Gigabit (~30MB/s) with Ubunut 14.04

So I have a dual boot setup (Win7/Ubuntu 14.04) on my Samsung Laptop Np530U3C. When booted into Win I get via wired network transfer to my desktop machine (win8.1) around 80-90 MB/s (read and write). ...
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How do I reconnect my WiFi without entering the superuser password?

The connection to my Mythbuntu system was recently changed from cable to WiFi. Now sometimes the computer disconnects the WiFi-connection and prompts for authentication. How do I tell Mythbuntu to ...
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28 views

WiFi card UNCLAIMED

I have Asus r510jk with Ubuntu 14.10 on it. I had some problems with with, so I tried installing drivers for my network card: Realtek RLT8821ae. Problems occured when I restarted system, and there ...
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how to configure USB mounted WiFi WLAN Adapter

I have a WiFi USB adapter/router . This adapter is using Realtek Semiconductor Corp. RTL8191SU. and supports WLAN 802.11n the output of lsusb gives me the following output ID 0bda:8172 Realtek ...
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My Cisco Netgear

I have a desktop no working lan cable and my router doesn't read them so I use a cisco netgear. The problem is when I installed ubuntu that I can't get it to recognize my cisco so I can access the ...
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Ubuntu Netwok problem

So this is my problem. I have a server which I run Ubuntu 14.04 on. I also have the same Ubuntu on my pc which is a double boot. Now I have tried getting Samba and Splashtop to work on my server but ...
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WiFi connection to router but no Internet connection?

I installed Ubuntu on my EasyNote-TM86 today. I can't access any websites although I am connected to my router. Other devices (including my laptop before I installed Ubuntu) are able to establish a ...
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Ubuntu won't connect to my router, But connects to my hotspot on my phone. Why is this?

I have installed Ubuntu for the first time, and it won't authenticate to my router. It connects just fine to my wireless hotspot, and i'm not sure if it can connect via ethernet cable. Any fixes to ...
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How do I change the primary DNS address of my DSL connection in Ubuntu 14.04?

I am using a DSL network connection in my Ubuntu 14.04. There has been set up a primary DNS address of my ISP by default. But I want to use Google Public DNS. I tried to edit the connection by going ...
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35 views

Network issues on 14.10

I have installed Ubuntu 14.10 on my desktop computer in the office, but I'm having troubles with the network. The issue is that I can't make it connect to the network at all, as it displays icon for ...
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35 views

Ubuntu 14.10 (Utopic Unicorn) doesn't connect to wireless networks

I'm using 6-7 years old LG MB500, just installed Ubuntu 14.10 (Utopic Unicorn), and I can't connect to my school network (WPA-WPA2 ENTERPRISE,TLS, MSCHAPv2, no CA certificate). The computer displays ...
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1answer
29 views

Track Network Usage in Wifi Connection

I'm a student staying at a communal residence of 6 people and the rent includes internet access which is supposedly uncapped but if you really push your downloads(lets say more than 300GB) the ISP ...
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Wake-On-LAN (WOL) not working if hibernating for a longer time

I am using pm-hibernate to set my 12.04 server to power saving mode. If it is woken up using Wake-On-LAN after a short time (e.g. 10 minutes), everything works OK. But if I try to WOL the server ...
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WiFi randomly turning off or disconnecting (lenovo t540p, Ubuntu 14.04)

I installed Ubuntu 14.04 on my lenovo t540p. Everything is working good, however, the wireless keeps turning off or disconnecting from time to time. This is my iwconfig: eth0 no wireless ...
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Ubuntu hotspot unstable and unable to connect to it from android 4.4.4 cyanogen mod

okay im using kde nm connection editor for the trick yesterday it worked but today after i booted up and started it it ran well but when i try to connect to it from my device the thing i see is ...
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Ubuntu 14.04.2 32-bit cannot connect to internet

I just installed Ubuntu on my old desktop today(removed Windows completely), and I am unable to connect to the internet. When I checked behind my CPU for the network port, the lights blink until ...
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Accessing my Server over the Public Internet

I have installed apache couchDB on my server and ran the following command : HOST="http://commcarehq:commcarehq@127.0.0.1:5984" curl -X PUT $HOST/commcarehq which was succesfull but when I run ...
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network connectivity problem in 13.10 ubuntu [on hold]

I recently installed Ubuntu 13.10 as a dual-boot with Windows.My wireless Internet connection is working in Windows but in Ubuntu 13.10 it got disconnected and my browser shows off-line I have tried ...
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38 views

How to lock down connecting to a specific WiFi

I have a laptop what has WiFi on the motherboard, but it only supports 802.11a/b and WEP. My WiFi network is 802.11n with WPA2-Personal. So I purchased a USB wireless stick that's compatible with my ...
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26 views

Can't connect to Samba server by name

I have an Ubuntu 14.04 file server running Samba 4.1.6. The server is a member of a domain with a Windows 2012 server acting as the primary domain controller. I want to connect to it using Windows 7 ...
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30 views

access ubuntu server running in virtualbox from outside network?

Is it possible to access ubuntu server running in virtualbox from outside network? I set it up with the bridget network adapter so it has its own IP. I can access my ubuntu server from inside my own ...
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Unable to connect to Verizon POP Email under DSL

Problem Description Prior to this problem, using Verizon for my standard Telephone connection. Updated my Telephone line to use DSL last Month DSL part working perfect Past two weeks ...
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16 views

Cannot able to connect to another host

After few self tests, i thought its a telnet-ing problem. So i am recreating a shorter version of this question I have two machines. cassandra is running on one machine. let assume its ip is ...
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12 views

remote CORBA lookup (firewall, port, telnet)

I'm trying to do a CORBA lookup on a LAN from one pc to another. How do I troubleshoot the connection? On the server running glassfish: thufir@doge:~$ thufir@doge:~$ ...
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1answer
39 views

Ubuntu 12.04 In tray Icon -> “Edit Connections…” not clickable

I am use ubuntu 12.04 with gnome-panel, I press network tray icon then Open following small menu, Last "Edit Connections..." not clickable how can I edit my wired and wifi connection?
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24 views

DHCP server not running

I have this : $ sudo service isc-dhcp-server start isc-dhcp-server start/running, process 7202 $ sudo service isc-dhcp-server status isc-dhcp-server stop/waiting I have two interfaces (eth0 and ...
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1answer
21 views

suddenly lost host routing on ubuntu server

i have ubuntu 14.04 server, which installed as a web server. the server also has 35 routing entry. sometimes the server suddenly lost connection to one or two another server, which routing entry has ...
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1answer
17 views

How to add local tld to name resolution searches

So in windows, if I typed ping familyroom, it would tell me that my PC in the family room is 192.168.1.61. (DHCP assigned address that isn't in any DNS) I'm running a new install of Ubuntu 14.04 ...
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MAAS Network and NAT

Here is the case: 1) I have a public network connected to internet LAN #1 2) I have another private network for MAAS and its DHCP and DNS , LAN #2 3) For internet connection i need to enable NAT ...
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32 views

Wifi problems with rtl8723be in Ubuntu 14.04

I have dual booted my Windows 8 laptop with Ubuntu 14.04. The wifi driver is Realtek rtl8723be. It didn't use to work but I updated the kernel to 3.18 and reinstalled the driver and that seemed to ...
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1answer
25 views

cannot access home wireless in ubuntu 14.10

Since i upgraded to 14.10 my home wifi doesn't show up in the list of available networks. I can connect to the wifi by phone, or other computers, but not my laptop. (btw: samsung RV520) I have tryed ...
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How can I share my printer on Ubuntu GNOME with a Windows 7 HomeGroup?

I'm using Ubuntu GNOME 14.04 on my desktop computer, which has an HP F4100 connected directly to it via USB. My parents' desktop computer runs Windows 7, which has a HomeGroup set up; my school-issued ...
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File sharing problems between Macbook Pro and pc with ubuntu 14.04

I have problems communicating my macbook Pro with my pc (running with ubuntu 14.04), i have tried to use samba but nothing happens. My macbook doesn't detect my pc ...