Managing and using network connectivity on a unix system

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Resources usage in x-forwarding

AFAIK, it's possible to forward X-Window sessions, i.e. a computer ("client") may work as a (dumb?) terminal for another ("server"), displaying the desktop, GUI, etc. (and playing sounds, etc.) This ...
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15 views

suddenly no service, except ssh is accessible from wan

I recently did install the GNOME Desktop and Graphical Administration Tools package groups to my remote host, for remote desktop connection. After the installation of nearly 550 dependencies was done, ...
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2answers
52 views

Arch linux get network interfaces names

I need to get all intefaces names in Arch linux. If I issue command ifconfig, I get following response: [root@pi ~]# ifconfig eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ...
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32 views

iptables is ignoring rules?

I've found some strange traffic through tcpdump (traffic is ongoing always): 13:00:13.203754 IP 1.2.3.4.1028 > 188.113.188.16.56881: UDP, length 103 13:00:13.204396 IP 1.2.3.4.1028 > ...
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33 views

vmxnet3 multiqueue support in vmware workstation

I'm working on an application based on RSS multiqueue(receive side scaling), and testing it on vmware workstation, but found that vmxnet3 nic have problem with RSS. My linux virtual machine has 4 ...
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1answer
42 views

disable dhcp in initramfs

In Debian, how can I tell initramfs not to request an IP address via DHCP? I'm using initramfs-tools. I'd be okay with assigning a static IP address for the initramfs, but I can't find how to set ...
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61 views

Raspbian /etc/network/interfaces file not present in ArchLinux

I am porting software system with central java application, "talking" to php webpage. In php webpage, there is a subsite for configuring network parameters, which in the code reads/writes from/to ...
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2answers
73 views

How to configure network for pluggable ethernet adapter under ArchLinux (systemd)?

I have an USB ethernet adapter, but I am not sure how to configure it that the network is set up properly when the adapter is plugged in and out. Can I add something to netctl's config file to link it ...
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25 views

OpenVPN on Ubuntu VM

I am trying to create a VLAN Network from my home network for a web-dev platform. I am running Ubuntu servers in VirtualBox on a Windows 7 machine. I am running an Ubuntu DHCP/OpenVPN/Shorewall ...
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1answer
262 views

unable to restart networking daemon

When I type sudo service networking restart, I am getting error as shown below: edward@computer:~$ sudo service networking restart stop: Job failed while stopping start: Job is already running: ...
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25 views

Changed to another wi-fi network does not connect

I'm always connected to a wireless network in my home from my Ubuntu 14.04 laptop (via routers) Now I am in another place where there's an iMac sharing internet connection. My phone and other's, and ...
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1answer
55 views

Is it useful for a proxy to buffer less data than Linux RCVBUF can?

I am looking at how HTTP proxies and reverse proxies deal with slow client problems. The idea is that the upstream server only have a limited slots for clients and if the client is slow to receive ...
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1answer
101 views

MacOS X Mavericks running VirtualBox cannot communicate with Linux VM

I have a MacOS X Mavericks host running Vagrant using VirtualBox as a provider. I have experienced several times that with different VMs (particularly Ubuntu Linux VMs) after the first time the VM is ...
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17 views

iptables and applications

I'm trying to set up a little download box. I currently have pyLoadCore, Transmission-daemon and openvpn all running on raspbian (raspberry pi running headless). My problem arises when I have openvpn ...
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1answer
21 views

Always Forward Traffic Out The Interface It Originated On

(This is the original question but my eventual solution was too different from how I originally asked the question so I'm posting as a new question.) Background: I have a VM with three different ...
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1answer
50 views

Two Wi-Fi dongles bridge and LAN for SSH

I just can't wrap my head around this one. I have a setup with two Wi-Fi USB dongles on a Raspberry Pi (Model B). It runs a Debian-based dist called Raspbian (all updates, etc.). The USB devices have ...
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18 views

multiple instances of /usr/sbin/ifplugd

why do i have multiple instances of /usr/sbin/ifplugd running, is there a problem Also my CPU seem to be running Maxed. I suspect the 3g got disconnected and the system was then trying to connect each ...
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1answer
26 views

Find out with a command if we can listen on a port

It is possible with a simple Unix command to find out if we can listen on a port or not? I'm building an application in which the user has the permissions to change the port. I have to check though ...
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110 views

rp_filter dropping packets in linux bridges+vlan_tagged interface + tap interfaces configuration

I've a linux bridge which has it's first interface as a eth0.123 (VLAN tagged interface) & one or more tap interfaces created by kvm. (libvirt+kvm VM) [root@compute1 ~]# brctl show bridge name ...
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114 views

Network firewall on CentOS, host cannot be resolved?

I have a centos machine and I am trying install some dependencies using yum. When I do this I keep getting a message saying the host cannot be resolved. I was told the previous person that used the ...
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1answer
43 views

OpenConnect not resolving hostnames

I'm running LMDE 17, and I've installed OpenConnect v6 and the repository version of network-manager-openconnect. Everything is peachy, except any address for the domain companyname.local doesn't ...
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1answer
30 views

Virtual ethernet is not getting its static ip on hotplug

I need to configure an ethernet interface to get its ip address dynamically if there is a dhcp server out there, and always have a static ip whether there is a dhcp server is present or not. I have ...
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1answer
96 views

Kali linux network connection icon missing

I was trying to setup a vpn connection in Kali linux but i don't know what did i do that network connection icon (screen top right) is missing and i can't connect to internet! How do i fix it?
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1answer
37 views

Application specific DNS problem?

I'm working on a live stream transcoder application using nginx + ffmpeg. Everything works fine when I use avconv to transcode, but if I use ffmpeg, I get this error: [tcp @ 0xb4e9da0] Failed to ...
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36 views

Network communication between two nodes in a Hadoop cluster

I am running a 7 node hadoop cluster with each box running Ubuntu 12.04. It is running CDH4 setup using Cloudera Manager. It was already setup and running when I came in but now I'm running into a ...
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1answer
56 views

Allow wifi connections only to a local service, don't route to the wired ethernet

I have a Raspberry Pi running Linux (Raspbian) which is connected to my corporate Internet over an Ethernet cable. The RPi also has a wifi adaptor plugged into a USB port. I've been following along ...
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53 views

Received DUP when using ping. What should I do?

I was pinging Google last night and one of them came back as DUP(!). I did some reading and I found this in the man pages on ping(8): Damaged packets are obviously serious cause for alarm and ...
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2answers
61 views

why I can't see the interface in Linux Debian

I set an eth1 interface in Linux Debian, and I rebooted after that, but I don't see it when I would like to use the sudo ifconfig, or ifconfig command (as root) only the eth0 interface. The settings ...
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18 views

Setting gateway to dynamic IP

My home router (given by ISP, must use it) does not accept static IP connections. I need to set the gateway for eth0 pointing to wlan0. I've succeeded in setting gateway in etc/network/interfaces/ to ...
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1answer
96 views

How can I create Local Loopback on Linux?

I need to create local loopback as shown herein: Performing Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces. Excerpt Configure a Local Loopback Action To configure a local ...
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2answers
57 views

How can I debug traffic on a switched network with Wireshark?

I have an IP phone on my home network that I am trying to call using SIP from outside of my home network. I have port forwarding setup, but the phone is responding with a SIP 404 message. All the ...
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1answer
34 views

How to return Uptime of successful OpenVPN connection

I'm trying to figure out how to return the UP Time of a successful OpenVPN connection. I've tried different variants of the following code: #!/bin/bash TMP=$(grep 'tun0: link up' /var/log/syslog* | ...
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24 views

Find out the cause of “Hard Block”

I have a Beaglebone Black I managed to install wifi drivers, find networks to connect to, but I always fail to do so. Apparently rfkill is setting Hard Block which is ( correct me if I'm wrong) ...
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60 views

What does this host means ' ::1 '

To secure my mysql server, I checked the list of users : mysql> SELECT User,Host,Password FROM mysql.user; +------------------+-----------+-------------------------------------------+ | User ...
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46 views

How to exclude LAN traffic with iptraf-ng?

I'd like to use iptraf-ng to see how much data my machine is sending/receiving from the Internet, but I want to exclude traffic on my LAN as I am only interested in data going off-site. I have ...
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28 views

How is it possible to send ping to all 127.0.0.0/8 successfully? [duplicate]

I have some wonders about 127.0.0.0/8 network and have 2 question about it. Firstly, why 127.0.0.0/8 is not considered as private network? I wonder this because wiki page does not mention about it. ...
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39 views

Where to find a basic tutorial/book on Linux networking? [closed]

I am not sure this question is eligible for this forum, so if not, please provide which forum is more suitable for this question. What I am looking for is a basic introduction in how networks work ...
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55 views

how to route traffic on port to ip:port on linux?

I'm trying to route all traffic on port udp 5000 to udp 192.168.0.1:12333 with the following command: $ iptables -t nat -A PREROUTING -p udp -m udp --dport 5000 \ -j DNAT --to 192.168.0.1:12333 ...
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84 views

VirtualBox guest machine as a nginx host

I have VirtualBox 4.3.12 with Fedora 20 and nginx 1.4.7 installed. Machine has Bridged Network interface and pings can be done both ways: from host machine (Windows 7) using ping 192.168.0.15 ...
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54 views

Configuring pulseaudio for receive mode

I am working on a project where I'll be running PulseAudio in receive mode on my raspberry pi. As for the server side, we've been writing a custom application on windows that will send an RTP audio ...
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28 views

Where do the frame overruns come from?

I have a network setup like this: +------------------------+ | Switch | | | +---------+-----+----+---+ | | | | ...
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49 views

How to bridge a VM to public IP

I wish to to assign the IP from my eth1:2 to a VM; I also have no use of this IP for the host, it would be desirable to be exclusive to the VM. I've ended up with a setup just like this (eth1:1, ...
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1answer
185 views

recvmsg returns 'EAGAIN (Resource temporarily unavailable)'

After a recent server move, we are troubleshooting this wierd issue of one of the server losing n/w connectivity for no apparent reason and regaining the connectivity in a few seconds or minutes. ...
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2answers
65 views

How to get the list of ports which are free in a Unix server

I have a requirement to know which all ports in my Solaris machine are free to be used for any kind of network communication. I tried the netstat -a command. But the information returned didn't give ...
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3answers
130 views

Generate networking configuration files using sed and bash

I am a bit rusty on my scripting abilities and am trying to find a good starting point for creating a script that creates files (generating new file names) and edits the IP address in the file by ...
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1answer
36 views

Understanding NAT concepts

I began learning networking on Linux, and I am looking for a way to associate a particular IP to a particular MAC address (i.e. a way to edit the NAT table?). Actually I am trying to assign some IPs ...
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31 views

Using PulseAudio to receive RTP audio stream

I'm trying to set up simple communication between my Ubuntu distro and my Rasbian distro on the raspberry pi. I'm more concerned about the rPi side of this project. I've been looking around the ...
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1answer
34 views

Understanding linux Bridging

I have started learning networking and recently been through bridging in Linux. Bridge in Linux could be set in two ways as far as I have got by reading on internet i.e. either by bridge-utils ...
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1answer
428 views

wget is unable to resolve host address 80% of the time

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
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23 views

How can I display an altered Network-icon to show when downloading is in progress? [closed]

Summary: When downloading is in progress, how can I change the appearance of the icon (in the Panel) which shows that the Network Connection is enabled? I realise this means using a different icon. I ...