Managing and using network connectivity on a unix system

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My captive portal does not display OS' splash page. How can I do this?

I have created a Wifi access point on my server. I added such configurations: 1. some iptables rules to ensure redirect to a landing page (local web) 2. no ip forward. Machine : linux mint 17+, ...
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20 views

“Network is unreachable”, github, bitbucket is not working

The output of ifconfig eth0 Link encap:Ethernet HWaddr 3c:97:0e:74:43:8e UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 ...
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10 views

Easy tips for optimizing Network I/O? [on hold]

We are a small company doing servers in-house, with (unfortunately) no resources to have a full time server admin. Currently we have 4 servers connected on a 40Gb/s fibre optic network, with ...
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kali linux airmon-ng issue

I am new to Kali Linux and I am currently running a VM using VirtualBox and I have selected network adaptor as bridge adaptor and connected it to my external USB WiFi adaptor. I have two problems ...
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3answers
128 views

Force all network traffic go through default gateway

I have a machine that I want to force all traffic to go through the default gateway. Even traffic on the local network. I have made it to work by removing the auto generated route for this interface, ...
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21 views

Internet connection drastically different for users

I am using Fedora 16, I know it's been EOL-ed but I've been too lazy to update and reinstall something new. Mostly, it works fine except that my main user's internet connection is really crappy and ...
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3answers
53 views

Impossible to have two network interfaces wifi and ethernet (as a backup) working together

I have a raspberry 2 with a wifi interface and an ethernet interface. wifi is my main connection with the ability to just plug in the ethernet as a backup method. I want to assign different static ...
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8 views

Trying to get the domain laptop.local to 127.0.0.1 with bind9

Already tried a load of guides but cannot figure it out somehow. I need it so that when I look at one of my webpages through a VM I do have to get the public IP of my laptop every time and so that the ...
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10 views

Is there any P2P VPN solution that does not requiere port opening(forwarding)?

The closest to a VPN P2P-based solution that I have found is PeerVPN, but it needs to open one port (7000 TCP by default) on each computer that runs it. I would like to prepare some linux devices ...
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1answer
38 views

What exactly do `/etc/network/interfaces` `up` and `down` commands do?

I am concerned that I may be incorrectly using the up and down interface options in /etc/network/interfaces. I was under the impression that these options were simply executed as a 'hook' after ...
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2answers
15 views

Send network traffic via a Windows VM on the same host to use corporate vpn?

At work we have a VPN solution that will only work on windows. I personally do not run Windows at home and run Linux (Ubuntu 14.04). I used Virtual Box to setup a Windows 7 virtual machine to run ...
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no internet through wwan0 when cable attached to eth0

On my Beaglebone card I run Angstrom Linux. It has one cable in the ethernet port (etho) and a USB 3G modem dongle in the USB port whose interface is named wwan0. At the other end of the crossover ...
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1answer
22 views

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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15 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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2answers
21 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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15 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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1answer
33 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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1answer
35 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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17 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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1answer
27 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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1answer
21 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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18 views

my ubuntu server is showing high upload bandwidth, [closed]

my Ubuntu server is showing high upload bandwidth, I checked with wire shark and it's showing some chinese and hongkong IPs. Only uploading. What's happening to my server?
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1answer
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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1answer
20 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
34 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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1answer
28 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
39 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
23 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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14 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
27 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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1answer
12 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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16 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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16 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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1answer
33 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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39 views

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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30 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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23 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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5 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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1answer
35 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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1answer
15 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
28 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
59 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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21 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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10 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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17 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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1answer
55 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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14 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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17 views

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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83 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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1answer
14 views

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, ...