Managing and using network connectivity on a unix system

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How to connect from home PC to Virtualbox/KVM that hosted on Ubuntu server?

I have an Ubuntu server, it's 3TB HDD space total and 24GB RAM, I want to take 1 little bit of space and RAM to make VPS Windows using VirtualBox or KVM. I want to install Windows Server 2008 on ...
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multicast routing (forwarding) using mrouted from OpenVPN tap interface to LAN

Brief network diagram: Host "S" < Tap OpenVPN > Host "C0" < eth0 > Physical Switch < eth0 > Host "C1" According to mrouted document, it doesn't need to config anything for receiving ...
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2answers
183 views

Multiple IP source on single interface in Linux

We could set multiple IP addressses on single interface, for example using NetworkManager: How to make any connection to outside of this PC to use different IP? for example if I have 8 IP ...
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1answer
26 views

How do I setup remote desktop to work seamlessly?

I've been using laptops for a very long time, and have preferred them over desktops for many reasons (one being, obviously, portability). However, right now I'm planning on building a simple home ...
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0answers
11 views

Diasbling ipv6 auto conf in Rh 6.6 when static IP is set [on hold]

In RedHat 6.6 versions, when ever static IP is set, server is not taking up the static IP since the ifcfg-etho configuration file has the Ipv6 autoconf parameter set to yes. IPV6_AUTOCONF=yes Is ...
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2answers
35 views

What is UUID of a wifi network?

From http://unix.stackexchange.com/a/158747/674, First, run nmcli c This will list your connections, with the first column being the SSID, and the second column being the UUID of the ...
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0answers
14 views

Multiple DHCP Offers - Which is selected? [on hold]

I have created a testing scenario in VMWare for a man in the middle attack using DHCP spoofing. It's for a college project. Windows 8 machine bridged to host adapter Kali linux bridged to host ...
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1answer
14 views

Error while trying to connect 2 pcs in lan

I'm trying to connect two PCs in local network and am having difficulties: not that information you need, so I will put some, if I can put it need more: pc1: OS GNU/Linux Mageia pc2: OS GNU/Linux ...
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1answer
32 views

LXC external IP configuration for containers

I rent a dedicated server and want to use LXC instead of KVM. I want to buy IPs for every single container. For now i have two external IPs: 193.X.X.30/32 213.X.X.31/32 I prefer a routing solution ...
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Interface doesn't go up with ip link set interface up

Until yesterday, Internet was just fine and I connected without much problems. I then disabled the network interface, trying to understand a little more how to manage these kind of things, issuing ...
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21 views

CentOS 6.6 network connection problem always breaks down

I installed centos 6.6 about a week ago. Then I set my IP to static and it works but after several hours I always lost connection. I can ping another computer in that network but I cant ping my centos ...
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1answer
22 views

post-up only once after reboot

I need to run a script ONCE the first time the system connects to the internet. So I use post-up in my interface to run the script. However, I only want to run the script once per boot. So if the ...
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1answer
33 views

Help translating this `ip` command to `route` command in `post-up` hook

I am having trouble getting a static routing ip command to become permanent by way of the post-up hook in /etc/network/interfaces. Here are the relevant details: /etc/network/interfaces # The ...
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1answer
30 views

Why is setting up WLAN in Debian so hard? (compared to Ubuntu) [closed]

switching from Ubuntu 14.04 to Debian jessie (LXDE) on a ThinkPad T500 Lan (eth0) is configured in /etc/network/interfaces and works fine. After setting up LXDE i wanted to switch to WLAN and it ...
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1answer
23 views

check tcp packets reception below tcpdump level

I am having an issue with my smartphone device and packets monitoring: I am trying to find a reason why I cannot establish a VPN connection via PPTP protocol. I have the following successful ...
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1answer
30 views

Unable to ssh into virtual machine on host only network

I have created a virtual machine in virtual box with host only network. I am able to ping to the virtual machine but when i try to ssh into the same machine it reject my request with following error ...
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2answers
44 views

Detect and respond to ping in userspace

Is there a way to make a linux system react or do something when pinged from another device, besides just sending a reply (or not)?
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1answer
27 views

connecting to virtualbox ubuntu from osx extremly slow

I am running ubuntu 10.04.x as guest on virtualbox from osx x 10.10.x host It works (kind of), but after working a while with it and also after power sleep it can get almost unusable slow. It looks ...
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2answers
63 views

Ubuntu won't connect to university internet [closed]

My WiFi adapter shows networks in the area, but will not allow me to connect to my university Internet. Normally, on Windows, I connect to the Wifi by clicking connect. It shows it as connected, but ...
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17 views

How to tune dhcp networks configuration?

I'm not sure how should I configure my guest VirtualBox networks. So far, I figured out how to override this configuration so that I can connect to machines on both networks. But I'm manually ...
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1answer
22 views

How do I detect which device was recently created by pppd?

I'm trying to setup a VPN over SSH using PPPD (following the Arch Wiki). The command given is: /usr/sbin/pppd updetach noauth silent nodeflate pty \ "/usr/bin/ssh root@remote-gw /usr/sbin/pppd ...
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2answers
36 views

Add virtual bridge without the loss of networking?

There is a dedicated server without KVM-over-IP support. The server 'owns' two IP addresses, and one of those is used for eth0 at the moment. The user needs to add a virtual bridge, in order to ...
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1answer
12 views

How to capture traffic from a website using tcpdump

I need to capture traffic to https://gmail.com using tcpdump. I solved this by using tcpdump -n dst host <ipaddress of gmail> But is there any way I can directly specify gmail.com instead of the ...
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1answer
29 views

Connecting to a WPA2 network

For connecting to networks use WPA/WPA2 with PSK, from here wpa_passphrase your_network_name your_password > wpa.conf ifconfig wlan0 down ifconfig wlan0 up iwconfig wlan0 essid ...
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1answer
27 views

Network UNCLAIMED - Unable to access internet

My Kubuntu was working well until I think a day ago, and suddenly I don't have access to Wi-Fi. I've tried turning on the connection via the Connection editor but the box was grayed out. After looking ...
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1answer
21 views

dd wrt firmwire file prompt password while extracting

I am a newbie in using dd wrt firmware development. Last day i download a dd wrt firmware dd-wrt.v24-21676_NEWD-2_K2.6_mini-e900.bin for Linksys E 900 router. I need to extract this image for ...
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2answers
56 views

What exactly happens in Linux internally when an ethernet cable is connected?

I would like to understand what exactly happens when a cable is being connected to the Ethernet port (assuming dynamic IP addressing): What services are being run and how are they triggered? What ...
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1answer
48 views

Compile network card driver on debian

I buy a new network card , D-Link DGE-528T. My OS is Debian(Jessie) kernel : 3.16.0-4-amd64 but it can't detect the new network card, so I must to compile driver by myself. follow README file. ...
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interface associates with access point, but dhclient hangs

I'm having an issue connecting to my access point from the terminal. I'm using iw to connect: iw wlan0 connect MY_AP Running iwconfig wlan0 shows that it's associated with the access point. But ...
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0answers
53 views

Disable networking only inside of a single terminal

I want to run a command in the terminal to disable networking, just in that terminal. How can that be accomplished? I'm running OSX. Note: I only want to disable the networking in that terminal. ...
0
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1answer
35 views

How to make virtual interface ping to a host in the network

I crated a virtual interface as indicated in this link. sudo modprobe dummy sudo ip link set name eth10 dev dummy0 sudo ifconfig eth10 up sudo ifconfig eth10 192.168.1.150 now if I want to make a ...
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1answer
53 views

Enable Promiscous mode in CentOS 7

How to enable promiscuous mode on network adapter. I have tried by adding PROMISC=yes in /etc/sysconfig/network-scripts/ifcfg-ensxxx but no effect even after network restart or rebooting the system.
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1answer
36 views

How can I monitor network connections for an app

I'm running a chat application on my machine called foo - how do I view all connection attempts (failed or successful) for foo? I have attempted this with netstat, but I am unsure how to associate ...
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1answer
33 views

USB Wi-Fi correctly installed but it can't access the Internet, Debian Wheezy

I have a USB Wi-Fi stick correctly installed on my Debian Wheezy system. from dmesg: ADDRCONF (NETDEV_CHANGE): wlan0: link becomes ready from ip a: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> ...
2
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1answer
44 views

How do I disable network interfaces from loading at boot without Network Manager?

The machine I'm using has 4 network interfaces, only one of which is currently being used (the other 3 are not plugged in at all). Currently when the machine is restarted it is delayed by a few ...
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0answers
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Need help with a network manager command line script

I am looking for some help in creating a script. As RHEL boots up and I login, I'd want to manually run a script which would: Identify the active ethernet interface (the eth ID being used). Ask ...
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0answers
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Is it possible to set interface name permanently in Raspbian?

I'm using 2 wifi dongles. First one is used to monitor and second one is used to access internet. Even if I changed /etc/udev/rules.d/70-persistent-net.rules as below, at startup sometimes wlan0 ...
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1answer
23 views

Congestion Control algorithm performance testing in FreeBSD

I am working on implementation of a proposed modification of TCP Congestion Control algorithm that would allow to improve it (the CC) by adding a dynamic bandwidth estimation. I have been able (with ...
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0answers
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Linux Container LXC Intra Host Networking Issues

I have a problem that I cannot seem to resolve. I have two hosts M and N. A container in host M can ping the gateway, its host and all containers in Host N but cannot ping any co-hosted container in ...
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4answers
1k views

Simplest way to send files over network

What is the simplest and most versatile way to send files over the network to other computers? By that I mean computers that other people are using at the moment. I don't think SSH works if the ...
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0answers
25 views

Bridge interface - add default route

I used to connect my ubuntu 14.04 laptop on office network via eth0 and the route table gets updated with the office network gateway ip in auto mode. Now, i changed my /etc/network/interfaces ...
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0answers
16 views

How to add routes multiple times in routing table?

Need to add same route multiple times in the routing table, or is there a way to maintain references in the routing table entries ? (may be with different priorities etc.) Am working on a switch ...
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1answer
43 views

What is blocking: Firewall and tcpwrapper?

Is it possible to find whether firewall(Iptable) or tcpwrapper is blocking a connection without accessing the remote server? (tcpdump?) Thank you,
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0answers
27 views

Command to see my current ip if proxy is applied only for a certain website

It might not be a relevent question here on so, but I tried on http://networkengineering.stackexchange.com and there are less users. So, I am not a networking guy and I have the next situation: I ...
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3answers
39 views

is there a system-wide “extension” to /etc/services that does not get replaced on package updates?

I know how to use /etc/services but if I change it and the inetd package is later updated via apt-get to a new default one, my changes are gone (happened to me on a apt-get dist-upgrade from Debian ...
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0answers
23 views

Which flags should I use for my “netstat” commands?

I would like to use two variants of the netstat command; one exclusively for IPv4 and the other exclusively for IPv6 traffic. In both cases I would only like to list the following information: ...
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0answers
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Program like vnStat that filters for only external (Internet) traffic

I've been using vnStat to monitor the ethernet interface on a Linux computer, but found that it includes all local traffic. I do many file transfers from within the subnet which far exceeds the ...
0
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1answer
36 views

Samba and usbmount: can't write on automounted device

This is my problem: I configured my RPi with Debian: Samba shares /media/, that is readable-writeable-executable from my home network usbmount automount USB devices when inserted in my RPi, in ...
2
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1answer
33 views

how to overcome conflict between 2 network cards - virtualbox ubuntu

I am running ubuntu 10.4.04 LTS as guest in virtualbox on OSX Yosemite. Unfortunatelly I seem to have the network configured wrong I followed this tutorials ...
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2answers
301 views

practical usage of /etc/networks file

What is the practical usage of /etc/networks file? As I understand, one can give names to networks in this file. For example: root@fw-test:~# cat /etc/networks default 0.0.0.0 loopback ...