Managing and using network connectivity on a unix system

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How to execute a command when internet is back

Sometimes my wifi is connected to router but my router is not connected to internet. How can I execute a command when my internet is back (from command line)? I want to execute: mpg123 /home/user/...
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1answer
22 views

can a service like isup.me be duplicated on the system for self? [closed]

The Internet or Web as I understand it runs on variety of servers. The browser is the client which gives a URI or URL which tries to go through varied ways to connect to the web-page and render the ...
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2answers
239 views

How to route 3 computers in a wireless ad-hoc network?

I have 3 computers: 192.168.2.1, 192.168.2.2, 192.168.2.4 connected into an wireless ad-hoc network. I want all the traffic from 192.168.2.1 to go through 192.168.2.2 when it talks to 192.168.2.3. ...
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1answer
66 views

What is the network connection speed between two containers communicating via a virtual bridge running on the same host?

Does a virtual bridge (added to /etc/network/interfaces) limit the transfer speed of data from the memory of one lxc/docker container to another? For example does the memory throughput drop to that ...
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1answer
15 views

linux - context-based access control

I would like to further restrict network traffic based on the source / destination application. To do that, I'm using network namespaces, but is there a better / simpler approach? My approach ...
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1answer
46 views

Set an IP in Centos for access in SSH when connected through WiFi

I recently installed CentOS 7 on Virtual Box with a minimal installation, and I have enabled the network interface in order to show my IP and access to it through SSH when connected by an Ethernet ...
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0answers
48 views

ubuntu 14.04 create route to multicast stream server and have access udp://239.255.0.169:5500

My server is ubuntu 14.04 server edition and I am trying to re stream existed multicast stream by my server : Multicast stream server is using udp://239.255.0.169:5500 destination ip. On my side I ...
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59 views

Persistent network namespace configuration

When creating a namespace with ip netns add <namespace> the namespace and it's related config is deleted on reboot along with created interfaces like veth pairs. What is the correct way to: ...
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69 views

Set up a preferred network interface on Debian/Raspbian

I have a Raspberry Pi that is connected by Ethernet to DSL (eth0) and I also have some 3G/4G dongles that I am testing for fallback, in case the RPi loses the wired connection. In other words, I would ...
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0answers
39 views

Beagle Bone Black not retaining static IP

I have a Beagle Bone Black to which I have assigned a static IP. My interfaces file is as follows. auto eth0 allow-hotplug eth0 iface eth0 inet static address 172.16.41.226 netmask 255.255.255.0 ...
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24 views

How can I set up my ethernet on a fresh install of Fedora Server 23?

I am using Fedora Server 23, and cannot get my ethernet connection to work. It works fine on Ubunutu, OS X, and Windows 7 on the same machine. [root@localhost etc]# ifconfig ens5: flags=4163<UP,...
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23 views

Cannot connect to WiFi network using /etc/network/interfaces

I'm trying to connect to a WEP WiFi network using only the /etc/network/interfaces file: auto lo iface lo inet loopback auto wlan0 iface wlan0 inet dhcp wireless-essid mySSID wireless-key ...
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2answers
118 views

Bind9 denied query

I created a bind9 based DNS server to work only in forwarding mode: This is my named.conf.options file: #acl goodclients { # localhost; # localnets; #}; options { directory "...
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2answers
93 views

How to detect / prevent systemd network startup failures

Using Centos 7 (most recent updates), on a remote firewall machine that is 200 miles away, I have occasional difficulty on reboot with the network stack not properly starting up. The box has 3 ...
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1answer
110 views

Simulate ethernet cable unplugged on a remote machine while staying connected

I am working from home on remote embedded Linux machine "X" via ssh. It has one physical network card. I need to simulate Ethernet cable unplugged condition on the same remote machine "X" , while ...
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1answer
71 views

Problem using GSM USB modems on HP Pavilion laptop

A week ago I migrated from an old PC running Ubuntu 11.04 to Laptop running Kubuntu 16.04. I am having problems using USB modems on the new setup. 1st modem is a ZTE. This modem intermitently loads. ...
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1answer
42 views

Searching for a solution to set up a reverse proxy for game servers

I run a game server on my dedicated box in country A, which runs Linux and communicates with its clients using UDP. The server has players from both inside and outside Country A. Players within ...
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1answer
93 views

How does Google know that I've got an old version of Chromium? [closed]

I use the Chromium web browser, and when I visit google's home page (www.google.co.uk), I get the message "We've detected you're using an older version of Chrome. Update to stay secure". The message ...
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1answer
29 views

How can I boot ubuntu from external Hard disk drive which is connected to Raspberry Pi

I have Raspberry Pi 2 which runs on Raspbian OS and External HDD is connected and mounted to it. It is connected to local server. I have a laptop and I want to boot Ubuntu from External HDD which is ...
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0answers
52 views

Enabling brcmfmac driver for Wifi on a Macbook Pro

So I'm trying to install Void Linux on my Macbook Pro however it doesn't appear to come with the brcmfmac module. There are a bunch of .bin brcmfmac files in /usr/lib/firmware but nothing in /usr/lib/...
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1answer
30 views

How do I configure VirtualBox snapshots running server processes to restore correctly?

I'm running VirtualBox 5.0.20 on an OS X host. There's a variety of guest systems, including Ubuntu, CentOS, Windows and OS X. For each of these systems, I created a live snapshot (i.e. while the VM ...
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1answer
64 views

User mode linux eth0 connected to host tap ethernet device not coming up

I am trying to setup the network between UML instance running on ubuntu as host. UML--eth0-(192.168.0.254) ----------------tap0--(192.168.0.253)--VM But, I am not able to bring the eth0 device in ...
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2answers
60 views

How to determine what IP addresses are available in a hosts table?

I'm working on a script that will read from the /etc/hosts file and determine what IPs are available in the hosts file. The way the hosts file will look is as followed: 172.17.164.2 System1 172.17....
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1answer
38 views

High time until SSH asks for password

I've been noting recently that any host that I ssh to in LAN, waits like 5 seconds before asking for password. ping sometimes also waits, but less(like 2 seconds), but it shows it has resolved the ...
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1answer
51 views

TP-LINK TL-WN722N weird behavior

I tried using the TP-LINK TL-WN722N wifi adapter with my fresh Arch Linux installation, but it has a really weird behavior. In my house, I have 2 access point, from which one is easily accessible from ...
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1answer
178 views

Connecting to wifi network with captive portal login page using wpa_supplicant

I am currently trying to connect to a BTWi-fi / BT_Openzone unsecured network in my office using my pcengines apu1d4 running debian 8.4 with edimax ew-7811un wifi dongle. When conventionally ...
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39 views

Configure “Link-Local Only”

I have a workstation running Linux seus and I want to link it to a network storage NAS ( WD cloud ex2 ultra) via a link-local only using the ethernet port on the motherborad ( connect directly the ...
3
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1answer
47 views

Unable to access internet after making ip static in beaglebone black

I am newbie in Beaglebone black. I am trying to make my IP static in my Beaglebone black. For this I follow this tutorial. After making changes according to tutorial, my /etc/network/interfaces file ...
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4answers
272 views

Is there a way to find self's dynamic public ip address using cli in Debian? [duplicate]

The easiest/simplest understanding of the web is a. When you connect to your ISP, the ISP gives a dyanmic address (like a temporary telephone number) only for the duration of that connection, the ...
0
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1answer
57 views

How to host a website on kali linux virtualbox machine? [closed]

I have a puzzle, shown here: http://imgur.com/a/ijyPf. How do I host my website on a Kali Linux virtual machine? How do I access my website with my public IP? I just don't know where to start and ...
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1answer
33 views

How to determine if it is a fault of the Network Card?

Basically, I have a PC having problems. Let's call it POO. POO is a pc running Gentoo Linux, with KDE. It is quite freshly setup on an old hardware. So far I do not notice it has other problems, ...
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2answers
76 views

Combine Two SSH Commands

The first ssh command is done on my computer, I enter the key password, then put the second ssh command in while logged into the server. ssh -i cloudkey -L 6000:localhost:6001 admin@54.152.188.55 -p ...
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24 views

Wep authentification fails with netctl

When trying to connect to a network protected by wep on my laptop I get the following error: Wpa association / authentification failed for interface <interface> I have the latest version of ...
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1answer
37 views

SSH - How To Make Three Computer Tunnel?

ComputerA connects though putty to Server at port 77, and there is a reverse tunnel set up from the Server at port 6666 to ComputerA at port 22. ComputerA also has a ssh server set up with a user ...
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1answer
27 views

CentOS requires root pw for network pref changes

Why does CentOS require root privileges to configure the preference panels? It seems like sudoer access really should be sufficient for this. Is it possible to change this?
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2answers
70 views

Static IP configuration on openSUSE

Long-time Windows user here -- this is a beginners question, network-configuration (especially on Linux distributions) is not my area. I believe I've done my research, however. Although I might've got ...
2
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1answer
72 views

Unable to reach network from chroot

I have a complicated scenario, with most of the complicated parts working: SD card contains a Fedora 23 Raspberry Pi install on a LUKS/BTRFS filesystem. Fedora 23 x86-64 VM being used to manage the ...
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1answer
21 views

how to configure a linux machine to broadcast the incoming traffic

I want to configure a linux machine so that it can broadcast all the traffic received by it to other linux machine (in this case the connected nodes). Can someone help ?
3
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1answer
77 views

Which process sent data out of my computer?

Using vnstat, I observed a lot of uploaded data from my computer and I don't know which process sent data out of my computer. Is there a tool to get stats on how much data a process consumed during a ...
3
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2answers
71 views

How can I auto-close dropped SSH connections?

When I work on my server remotely, sometimes my SSH connections get dropped due to network issues. When I re-connect to my server, the dropped sessions remain open. I can see them when I run w. I'm ...
9
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1answer
291 views

Cloned system + network interfaces

I'm currently in a little bit of a pickle. I've made an image of my system and I have given it to someone to run. They have successfully flushed their system with the image and are running it. The ...
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0answers
42 views

Resolve NetBIOS Names via Samba 4.4

Through StackExchange, we knew how to configure Linux to resolve NetBIOS names, and I have configured my system in those ways. (I have installed winbind, configured my /etc/nsswitch.conf correctly and ...
0
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1answer
78 views

Trouble Creating Virtual_IP for PaceMaker + Corosync - CentOS 7

Ok so I have gotten fairly far into the configuration successfully, the two nodes have authenticated each other and all is well, but when I try to add the virtual_ip it never starts. What i've used ...
2
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1answer
53 views

How go generate a valid and random MAC address?

You probably know that MAC address can be generated, for instance, in the following way: macaddr=$(dd if=/dev/random bs=1024 count=1 2>/dev/null|md5sum|sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)....
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1answer
27 views

how to change all the hostnames reported by hostname --all-fqdns?

Running hostname -A reports two host names: an incorrect one that doesn't even resolve to my server and a correct one. $ hostname -A notmyhostname.notmydomain.com myhostname.mydomain.com The ...
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92 views

Can't ssh into my server from another computer

I used to be able to ssh into my server from other computers. But I stupidly messed up my remote connection setup a couple weeks back (I don't remember what I did...) and now I can't ssh into my ...
3
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2answers
164 views

WPA supplicant dropping/disconnecting NIC in hotel wifi

TL;DR WPA Supplicant intermittently fails on my Raspberry Pi 3 when using a USB Wifi dongle. It appears to do this when "reconnecting" to or changing access points in the hotel. WPA GUI states: "...
3
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1answer
87 views

How do I configure Docker containers to have unique IP addresses that are not the default ones?

How do I configure Docker containers to have unique IP addresses that are not the default ones? The Docker containers will run Apache or some web service. These Docker containers will share one host ...
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0answers
101 views

How do I get Consul to work so I can get Docker Overlay to work?

I am running CentOS 7 with Docker. I am trying to install Consul on the Docker server. Consul is unzipped. The binary file works for showing the version. I ran this: echo $CONSUL_RPC_ADDR This ...
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101 views

Unprotected Windows Shares Still Requiring Password in Linux Mint

I am trying to access my windows shares from linux mint. I have 2 windows computers (both Win 10) and my laptop on Linux Mint. My office PC is password protected and can access those files from my ...