Managing and using network connectivity on a unix system

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Networking works only when using Iceweasel in Kali inside of VMWare

As the title says, I have a problem with my connection in vmware. I'm using vmware 10.0.1 andthe latest version of kali. It's a little weird that my connection will only work on iceweasel browser but ...
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12 views

Modem is stopped from being detected

I am using Trisquel 7.0 LTS and using mobile broadband (Net-Setter) to establish connection. All is working fine. My modem detects as follows (lsusb output): $ lsusb Bus 001 Device 004: ID 12d1:1436 ...
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7 views

Unable to connect the Ubuntu EC2 instance to VPC LAN on AWS using secondary NIC adapter?

Infrastructure setup: VPC is created with 192.168.254.0/24 netwok Private subnet within VPC (Virtual Private Cloud) is created with 192.168.254.0/25 network Public subnet within the VPC is created ...
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5 views

Establish reverse ssh tunnel at OS startup / network connection up

I'm trying to setup a reverse SSH tunnel using a middle-man, due to firewall restrictions. I took the following steps: from ssh server do reverse tunnel: ssh -R 8080:localhost:22 ...
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1answer
23 views

Make TCP to reconnect automatically and quickly

In my Debian Linux system apt-get dist-upgrade is sometimes stalled with [Waiting for headers] message. To make it pass faster I press Ctrl+C and start the command again. How to tune the system to ...
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Same Wifi names keep messing with connection

I just got a RasPi and I'm looking to replace the Windows PC that's doing the routing job. (To save electricity) What I'm trying to do with it is make it connect to a wifi network using it's bssid(or ...
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Internet sharing disappears when either eth0 or wlan0 gets disconnected

I just got a RasPi B+ and I'm looking to replace the Windows PC that's doing the routing job. What I'm trying to do with the Pi is making it share the connection (wlan0) with another wifi router (via ...
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6 views

recvfrom does not receive anything from the client, but the client is sending the info [migrated]

So I wanted to make sure I am not missing something and I have the concepts clean in my head. This is the part of the code I have: UDP_Msg mensajeRecibidoUdp; struct sockaddr_in c_ain; ...
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8 views

route gateway proxy traffic through different interface with identical upstream gateways

My question is similar to the below with a small caveat not answered by any of these threads: Output traffic on different interfaces based on destination port ...
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1answer
55 views

In Archlinux, it has a valid ip, but no connection could established

~ % uname -a Linux archlinux 3.17.6-1-ARCH #1 SMP PREEMPT Sun Dec 7 23:43:32 UTC 2014 x86_64 GNU/Linux ~ % ip route default via 192.168.1.1 dev wlp3s0 metric 303 192.168.1.0/24 dev ...
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26 views

Making static routes persist after a reboot

I have two VLANs (default vlan and vlan 5 for voip). I have 2 interfaces, one for each VLAN. My route table looks like this right now: Destination Gateway Genmask Flags Metric ...
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Linux Bridge Network with Static IP Addresses and Firewall

any and all help is appreciated. I am trying to set up my Network Map Can you give me advice in setting up my interface file? If I set a static IP on my PLC on the same gateway, I shouldn't need to ...
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31 views

Dump network traffic of single application (strace-like)

I'm looking for a way to dump pcap of network data generated by an application, in a simmilar way strace dumps syscalls, etc. eg: net-strace somecommand -args somecommand would do something over ...
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48 views

Trouble switching from DHCP to a static IP on Kali Linux

When I installed Kali Linux 64bit, I forgot to set up a static IP address, and now DHCP determines my address with my router. I have already modified /etc/hosts and /etc/network/interfaces to declare ...
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40 views

DHCP Kali Linux

I'm using VBox. I have got a Bridged Adapter. I need to get my network working. What I can already do is to set everything up manually, I mean: ifconfig eth0 192.168.1.33 netmask 255.255.255.0 route ...
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33 views

use only one wireless card to connect to wifi network and share internet through wifi at same time

Is it possible to use only one wireless card to connect to other wifi network to access internet and share the internet to other devices via same wireless card at same time ? No! I didn't mean ...
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1answer
25 views

dhcp without dns: ping `hostname` not working. Auto add hostname to /etc/hosts?

On RHEL 6.5 how to make my own hostname locally resolvable, if my ip address is dynamic and not registered in DNS? I know, it's possible to add dhcp hook scripts. Is there a similar way to hook the ...
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23 views

Serial Number Ban in Teamspeak

Hello I have a dedicated server and from it I'm running a teamspeak 3 Server. I want to ban the serial number of a specific client connecting to my teamspeak server. Although I have banned him from ...
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1answer
82 views

What overwrites /etc/resolv.conf on every boot?

I was given the files for a mini linux, that boots directly into firefox. It works for all it should be doing, only that I do not get an internet connection. We have 3 DNS servers in the network, ...
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1answer
20 views

Sharing ethernet over wi-fi with Network Manager and dnsmasq

I'm running archlinux with kde desktop. I want to share my enp2s0 connection via wi-fi. So I've installed dnsmasq. Here are some configs: /etc/resolv.conf # Generated by resolvconf search telecom.by ...
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1answer
36 views

Number of packets sent and received on an interface

I'm interested in creating a script which prints total number of received packets and sent packets on an interface. The output should be like: interface TX: number RX: number Can anyone help me ...
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1answer
28 views

Centos 5.01 can't connect to the internet

I am trying to download USB driver for centos 5.01 but I can't connect to the internet. I have tried to set ONBOOT="yes" , NM_CONTROLLED="yes" and BOOTPROTO="dhcp" on ...
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Linux Mint will not allow traffic from one specific PC on LAN

I was editing /etc/network/interfaces, and then decided to change my settings over VNC instead. This halted my SSH session and also my VNC. I'm not sure if this locked me out or not, but I set cron up ...
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59 views

SSH randomly stops working, and any other request from network related services

I'm pulling my hair out right now, since I don't know where else to look, what else to do, to find out why the SSH stops working suddenly. The ssh-server is on the same network as the client, but it's ...
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39 views

ifconfig -a get needed data grepping

If I issue following command to obtain network interface data: [root@pi lib]# ifconfig -a eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.154 netmask ...
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1answer
24 views

Linuxfoundation LFCS cert - Exam Topics Confusion

I am preparing to take the LFCS exam on linuxfoundation and I am stuck. In the exam objectives from the Cert Guide Manual they list the topics you need to be prepared for. But a confusion arised when ...
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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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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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40 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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28 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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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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29 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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38 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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49 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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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
125 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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24 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
47 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
43 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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15 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
16 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
37 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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11 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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43 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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38 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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22 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
21 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 ...
0
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1answer
40 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
34 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 ...