Managing and using network connectivity on a unix system

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Intermittent Network disconnection, Ubuntu, troubleshooting help

I purged network manager from my system (OS: Linux 3.13.0-53-generic #89-Ubuntu) Networking service runs on my system: sudo service networking status networking start/running Static interface ...
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19 views

How to statically assign network interfaces to USB Wireless LAN adapters

For this system there are two WLAN USB adapters: One connects as a client always, and the other connects as an AP. I have a script that manages their operation, but in order to do that I need to ...
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24 views

Setting a domain name in LAN

I am developing a web page using Apache Web Server in my pc. When I want to open it in the browser I use the ip, for example: http://192.168.1.6/proyect My host is part of a local network (a laptop ...
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27 views

Delaying packets with libnetfilter_queue

From my Raspberry Pi configured as an access point, I set the following rules: sudo iptables -I FORWARD -p tcp --sport 25 -j NFQUEUE --queue-num 0 sudo iptables -I FORWARD -p tcp --sport 80 -j ...
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43 views

network connection only works for a while?

I upgraded my Debian Jessie desktop two days ago but I found that I am not able to connect to internet via eth0 now. I've pinged www.google.com, but it told unknown host; for inet addr and Bcast (in ...
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40 views

How to know which computer is trying to access a specific host

At my workplace we tend to get those annoying captchas once in a while when we are trying for search something in Google. When we got into that page it says that our network is trying to access ...
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40 views

Wifi cuts out after some time

I recently installed Debian on my laptop (after playing around with dozens of distros in VMs for a year or so), and while most everything has gone quite swimmingly I'm having some issues with my wifi. ...
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39 views

How check a port forwarded from localhost to localhost on.. localhost?

I'm learning about iptables, firewalling, routing and so on. I'm on Linux, Centos7, and I've set up a local port forwarding to localhost with: firewall-cmd ...
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33 views

Get CIDR of my IP on the WAN

I have a script that updates some remote systems with my laptop's IP and CIDR on the WAN, how the Internet sees me, in other words. I use the following to get my IP on the WAN in bash: dig +short ...
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26 views

create virtual adaptor over network on other machine

I have Machine A (Desktop environment install/Powerful machine) running Linux that has all my programs, scripts etc on it. I connect to machine B (Voyage Linux (Debian)/ALIX pc engines) over ethernet ...
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56 views

Mysterious disappearing static IP address on wifi interface under Debian?

With these lines in \etc\network\interfaces... allow-hotplug wlan0 iface wlan0 inet static address 192.168.8.1 netmask 255.255.255.0 gateway 192.168.8.1 ... the interface comes up about ...
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1answer
41 views

ifconfig showing invalid ip address

I booted pretty old PC (HP d530) with latest (2015.06) Gentoo linux minimal cd. The next step I wanted to perform was to enable SSH server on this machine. I ran ifconfig to see the ip address of my ...
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32 views

See total bandwith a process has used

I am currently watching some process on my server and want to see how much bandwidth it has used in total since it has been started. I don't want to know its current usage, nor does nethogs / nload ...
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1answer
57 views

What commands can I use to debug or profile a slow DNS / internet connection?

I'm at an enterprise where there's generally a very fast internet connection, but every time I visit a web page, it takes a really long time. I tried profiling this in the browser, and the only thing ...
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1answer
32 views

How to use the same Wi-Fi adapter to connect to a wireless network, and broadcast an AP at the same time?

I have a Wi-Fi router that runs OpenWRT. It connects to my home Wi-Fi and uses it for Internet access. At the same time, it broadcasts an access point itself and it is bridged with its LAN so other ...
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25 views

Kernel routes not loaded to Quagga ospfd process (freeBSD)

I'm trying to redistribute kernel routes that are added using the route command. For example: route add -net 2.0.0.0/24 -interface em0 I'm using Quagga ospfd under pfsense to redistribute the ...
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1answer
34 views

Delay after a MAC change

I am writing a script that will change my ethernet MAC address on a local network. It will work as follows: Initially eth0 will be brought down MAC will be changed using the ifconfig utility eth0 ...
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14 views

Letting a device access internet trough ethernet port via a laptop [duplicate]

So i have internet access to my laptop, over wifi. I have connectd a device with an ethernet port (with an ethernet cable from my laptop to the device), and set up a local area network between the ...
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25 views

Access point doesn't give IP adress after DHCP request

I'm trying to achieve this : http://askubuntu.com/questions/318973/how-do-i-create-a-wifi-hotspot-sharing-wireless-internet-connection-single-adap Almost everything works fine, but my dhcp server ...
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22 views

Script to remove IPs or network ranges from an IP space

As per the tittle, I have a tool that accepts both lists of IPs or network ranges (CIDR format) to perform a task. Unfortunately, it does not support exclusions of IPs or ranges from the IP space ...
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55 views

Meaning of 'netstat -anto' output

I did netstat -anto and got following result: Proto Recv-Q Send-Q Local Address Foreign Address State Timer tcp 0 0 127.0.0.1:1169 ...
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Linux Routing Question

I was wondering how it would be possible to have multiple IPv6 default gateways on CentOS linux. I currently have two interfaces with IPv6 (venet0 and tb0), both with different blocks routed to them. ...
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41 views

Why is my UDP bandwidth significantly lower than TCP bandwidth in iperf

I am running a simple bandwidth test between two VMs using iperf. I am getting very different bandwidth reading for TCP and UDP where the UDP bandwidth is terribly lower than TCP. TCP: ...
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35 views

check the current backlog queue size

The sysctl netdev_max_backlog sets a limit to the maximum number of packets allowed in the kernel's backlog queue. Is there a way to check the current queue size (i.e., how many packets are currently ...
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9 views

How to install airtel 3g dongle in redhat linux 5?

I have an Airtel 3g dongle, that I am not able to install in RedHat 5 Linux. I am getting the error : chmod +x install_linux "read only file system"
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36 views

Network: how they obtain 127 subnets? [closed]

I read on a book about networks that class A has 16777214 hosts and 127 subnets,my question is: how they obtain the 127 number?
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25 views

Two networking interfaces trying to get an IP via DHCP

When using: /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp auto wlan0 allow-hotplug wlan0 iface wlan0 inet dhcp wpa-ssid "<myssid>" wpa-psk ...
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1answer
30 views

Boot blocked during 1min30sec because /etc/network/interfaces

With the following config (see config file below): if only ethernet cable is connected, it 100% works: I can quickly SSH the computer via eth0's IP, if both ethernet cable and wifi dongle are ...
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1answer
82 views

DHCP and read-only root filesystem

When doing ifup wlan0 on a system with / mounted as read-only (embedded computer), I get this error: Failed to connect to non-global ctrl_ifname: wlan0 error: Read-only file system Internet Systems ...
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30 views

Trouble switching between wired/wireless networks with Fedora 21

I have a Gb/s wired network and a much slower wireless on my home LAN. I switch between them in the course of my day. I have always found that Linux is not particularly clever about using the wired ...
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11 views

Share Oracle Database Connection from one system to another in same network

I have installed Oracle 11g XE in one machine, which has cent os 6.5 installed in it. Now i want to connect to this machine's oracle database from an another machine. Both are connected to the same ...
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37 views

Ethernet USB dongle works then randomly drops until restart

I've been using xubuntu 14.04 as my daily driver for a while now, as I've been getting into web development. I'm using a dell ultrabook that has no ethernet port (XPS 12 9Q33), and so I have usb 2.0 ...
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78 views

Gentoo: how do I get an IP assigned to the network interface?

I'm noob. I'm trying to install Gentoo from the LiveCD (just for fun as well as for getting better understanding what's going on under the Linux's hood) on my notebook. I've faced an issue which is ...
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17 views

Wicd cannot detect wireless networks on Point Linux OS

I have just installed Point Linux OS on my PC. The problem is: it cannot detect wireless networks, but it is okay with wired network. Please help me.
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Converting a raw print data stream containing PCL commands to PDF

I have a program that sends raw print data through samba to typically PCL compatible printers. The program is written so basic PCL commands control how it prints. When sending it to the printer it ...
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283 views

Is it possible to throttle upload bandwidth per `IP` basis using `tc`, `htb` and `iptables` ? (Download limitation not required)

Problem I've searched internet like anything but couldn't find much about limiting upload. The solutions given are not limiting IP basis like this one but LAN as a whole. +-----+ ...
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Need to write an automated web navigator with “click” and “retrieve” capabilities

In our company, several clients provide the detailed information information that we need in a web site. The amount of time that our employees spend navigating the remote website is simply ridiculous, ...
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31 views

Required new 'X' desktop for VNC?

I'm on Raspberry pi 2, running Raspian, and using Ubuntu 14.04. I am using the tightvncserver. I don't think I should have to start a new 'X' desktop each time I want to VNC into the pi, but whenever ...
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1answer
40 views

IP address alias? E.g. map 203.0.113.37 to 127.0.0.1?

I want to use an SSH tunnel to work on a project, -L 8080:localhost:80. When opening http://localhost:8080 on my local machine things work, but the server (MediaWiki) is putting a lot of ...
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1answer
56 views

Finding out the number of dropped packets in raw sockets

I am developing a program that sniffs network packets using a raw socket (AF_PACKET, SOCK_RAW) and processes them in some way. I am not sure whether my program runs fast enough and succeeds to ...
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140 views

Ubuntu 15.04 wired connection keeps dropping and restarting

I've finally switched to Linux (Ubuntu 15.04) 2 weeks ago and everything went well. But unfortunately after turning on my PC today and doing the usual (sudo apt-get update, sudo apt-get dist-upgrade) ...
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57 views

VPN: Script at /etc/ppp/ip-up.d/ not autoexecuting on PPTP connection established

My PPTP client is Ubuntu Desktop 14.04.2LTS. My PPTP Server is a Buffalo DD-WRT Firmware. If I establish my PPTP VPN connection (named Themiscyra): luis@PortatilHP:~$ sudo pon Themiscyra ...
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1answer
45 views

How do I install a network printer without being dependent on the IP-address of the printer?

In Linux I want to install a HP LaserJet 1320n that needs to be power up and down. It will get a new IP-address every time it's powercycled. How can I install the printer on a Linux machine and not be ...
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65 views

VirtualBox network interface with custom CIDR and internet access

I have an OpenStack setup running on VirtualBox. The host OS is Ubuntu, and the guest OSes are all Ubuntu. I use 3 VirtualBox VMs to setup and install OpenStack. My OpenStack setup further spawns ...
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1answer
15 views

Setting up QEMU and MIPSEL : networking trouble

I have a MIPSEL machine running on QEMU. In order to enable networking inside my qemu MIPSEL machine, I use a bridge virbr0. First, I create the interface tap0 and bring it up. I do it as follows :- ...
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Route dies on Ubuntu 14.04.2

So I have this routing setup in EC2 on a Ubuntu machine: 10.50.0.0/24 dev eth0 proto kernel scope link src 10.50.0.163 x.x.x.x via 10.50.0.80 dev eth0 proto static y.y.y.y via 10.50.0.80 dev ...
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49 views

Getting error in nslookup

I am trying to do nslookup skhdphost1 but I am getting below error. When I try to Reverse lookup checking using command nslookup 172.16.xxx.xx again getting the same error: The error message is: ...
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2answers
93 views

How to share one internet connection from LAN to another LAN?

I have a Raspberry Pi connected to a router (Router1) with internet connection in en0, with IP 192.168.1.110, however I have my RPi's wifi port (wlan0) connected to another router (Router2) with IP ...
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0answers
59 views

How to find out the wifi sensitivity (RSSI)

I want to be able to get the received signal strength indication from my computer's wifi interface, ideally as expressed in dBm. This article explains what I am after.
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Cannot connect to public IP address of server used as VPN gateway?

When I try connect to the public IP address of server that is also used as an openvpn gateway from a Windows computer within the network it fails to connect, but if I connecto the VPN ip address it ...