Managing and using network connectivity on a unix system

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How do I figure out where wrong local dns results are comming from?

I'm running mint Mate 17.2. When I use dig, for a certain specific domain name, the resolved IP "answer" is wrong, and the answer server is 127.0.0.1. Trying to access this domain from my local ...
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0answers
7 views

WiFi Drivers Not Working

I just installed Linux Mint 17.3 on my mid 2012 MacBook Pro. I'm currently trying to install the necessary drivers for WiFi via Driver Manager (nvidia-331 and bcmwl-kernel-source) for my BCM4222 ...
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2answers
18 views

Renew my ip address (dhclient not found) [on hold]

I recently got a new cable modem and my internet connection is no longer working. I suspect I need to renew my IP address. How can I renew my address? The command ifconfig returns: bash: ifconfig: ...
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1answer
9 views

Printing to ubuntu client via network, using php that reside in windows 7 webserver

I plan to change my windows 7 client to ubuntu 14.04 LTS. The client has a local printer (Epson LX-310) that is used to print an invoice in web app environment built using apache with php (the web ...
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0answers
12 views

creating directories in a directory using loop [duplicate]

On my CentOS machine, I need to create a main directory inside which I will have a few sub directories and, inside them, some subsubdirectories. Something like: main_directory->sub1,sub2,sb3.. ...
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0answers
9 views

NAO robot running Gentoo based OS cannot connect to Wi-Fi automatically

I am using NAO robot for my Masters Thesis. It is running OpenNAO OS Version 2.1.4.13. This OS is Gentoo based. The problem I am facing is that it doesn't automatically connect to one specific Wi-Fi ...
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0answers
24 views

DHCP to assign different addresses for multiple interfaces and subnets

First of all, I'd like to point out that I've read any related questions asked here. So, on my desktop computer (running Ubuntu) I have three NICs - eth0, eth2, eth3. I have links connecting these ...
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0answers
14 views

SNR or signal and noise levels in ad-hoc mode

I am using the WiPi dongle which is based on the rt2800usb driver on my Raspberry Pis (running raspbian) in an ad-hoc network, and I can't seem to be able to get any SNR, signal or noise level ...
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2answers
46 views

Send my IP to remote server every time booting

I want to send my computer's IP automatically every time it boots. I edit /etc/rc.local sleep 10 ifconfig > /tmp/myip scp /tmp/myip <server> exit 0 I tried, and there is no inet addr, ...
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1answer
20 views

TCP over TUN: SYN/ACK is received, but no ACK is generated, and socket remains in SYN_SENT state

I am tunneling an outgoing TCP connection over a TUN interface set up by a program I wrote. The TUN interface basically just relays the packets to/from a proxy server, with minimal modifications ...
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1answer
17 views

How to disable interface just for NetworkManager in Kali Linux?

I have two WLAN interfaces, and I want to disable one of them for NetworkManager, so that if I run something like service network-manager stop, all the interfaces should stop except on of the WLAN ...
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19 views

Virtualbox connectity from vboxnet0 to internal network

I am trying to create a setup with gateway(Guest OS Ubuntu) in middle and an webserver(Guest OS - Debian) - must be connected to VM-2 only via VM-1 from host pc. My aim is to ping 10.1.1.2 from Host ...
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4answers
41 views

Setting up hostnames on local network [duplicate]

So, I'm setting up an experiment network for me and the other geeks at my school to use for website testing and server practice, and I'm the sys and net admin (but really it's just for playing Quake). ...
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2answers
35 views

Timeout with 'service network restart'

I have a script running on fedora 22 where I am restarting service network as part of a troubleshoot calling service network restart. I want to check if that command is taking too long to execute. If ...
2
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1answer
40 views

Network interface crashes after disconnecting eth wire or restarting service

At startup or reboot, network interface works fine. Host is reachable and also can communicate with other devices on the local net or internet. IP address is configured as static, and dns-nameservers ...
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0answers
42 views

How to do iptables nat loopback?

I have a linux server behind the ISP's cablemodem-router combo. With some hacking I was able to make the port forwarding work, and the DHCP exceptions in the udhcpd. But I wasn't able to do the NAT ...
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1answer
35 views

Is there a way to send packets through one ISP and receive answers through another one?

I just finished building my first load balancer that combines two different ISPs. This mechanism works just fine, but it's a little bit limited because a connection can't simply utilize both ISP at ...
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0answers
7 views

Boost ASIO async_write_some is really slow [migrated]

I finally found the bottleneck of my server and it turns out to be async_write and the same goes for async_write_some. Here the following benchmark code: struct timespec start, end; ...
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1answer
57 views

How to Do Split Tunnelling with Slave ppp0 VPN + 2nd VPN?

Network Finland(internet)-PC(Sweden)-Uni(Sweden). Uni IP is fixed. Finland(internet) is gained with 3g-4 connection. I need to use a VPN provider to change my country but the VPN provider gives ppp0, ...
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1answer
14 views

Where does a Centos7 VM get the IP address for the local host name from?

On my centos7 VM, hostname says bmargulies-centos7, domainname says (none), dig bmargulies-centos7 says what's below, and ping of that hostname hangs. Where does the IP address 92.242.140.21 come ...
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0answers
25 views

AIX: network and route problem

I changed my router some days ago. ping, internet, and network are working on AIX, but SSH is terribly slow. For connecting to other hosts on the same network it takes... two minutes! This is my ...
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0answers
8 views

Networking failed to start on Alpine linux

I keep having an error when booting Alpine Linux Networking failed to start. I'm using a RPI3 which is connected by an ethernet cable to the box. Here's the /etc/network/interfaces : auto lo iface lo ...
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0answers
14 views

Share Internet from WebOS tv with ubuntu pc through Ethernet

Is it possible to share WebOS TV's internet connection with ubuntu using Ethernet ? Do I have to do anything for this on my Ubuntu (Gnome) pc? I'll be thankful if you tell me How I can do that? Sorry ...
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3answers
36 views

Check my DHCP lease?

Is there a way to show my current (client) DHCP lease? Or even better - retrieve all options/infos sent with DHCPACK?
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0answers
25 views

Linux Mint keeps dropping /etc/hosts [closed]

I reloaded my machine two days ago. In the proccess of restoring my configuration I accidentally over-wrote my /etc/hosts file without making a backup. Since then, I have an issue with any of the ...
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0answers
4 views

using netlink is it possible to listen whenever multicast group membership is changed for interface [migrated]

I want to do some custom actions whenever an app wants to become a part of an multicast group. As I understand a app becomes a part of multicast by executing the following command sequence: /* use ...
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1answer
24 views

hostname -f .com.com

I modified my /etc/hostname file and /etc/hosts like that: hostname.com and 127.0.0.1 localhost.localdomain localhost ::1 localhost ip6-localhost ip6-loopback ff02::1 ...
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0answers
25 views

How to have systemd-resolved correctly come alive after hot plug?

Setup I am playing with a small embedded board running Debian Jessie. I am using as much systemd stuff as I can, including the networking stuff. I have added the file: ...
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0answers
31 views

Make debian use dual network ports for a gaming server

I have a server that has 2 LAN ports (or internet ports or whatever you call them) and i was wondering if its possible to make Debian Linux to use both ports? I will need maybe a link or somthing. I ...
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2answers
25 views

WPA_CLI showing access point as connected when it shouldn't

I'm using linux kernel 3.3 and am trying to use the wpa_cli utility to monitor the status of my WiFi connection. I'm using an Edimax WiFi dongle to connect to a wireless access point. Normally I see ...
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2answers
40 views

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 ...
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1answer
15 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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3answers
206 views
+100

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. ...
1
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1answer
32 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 ...
1
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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 ...
0
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1answer
31 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
24 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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0answers
22 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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0answers
25 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
28 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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0answers
18 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: ...
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0answers
19 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 ...
3
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2answers
84 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 ...
3
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1answer
51 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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0answers
63 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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0answers
7 views

Regarding telosB changing node ID using Ubuntu

Am working on telosB for glossy protocol analysis. When i tried flashing the program, there was some issues with the node ID. acn any one help me regarding how to set this node id... Thanks
2
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1answer
47 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. ...
1
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1answer
28 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
58 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
24 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 ...