Managing and using network connectivity on a unix system

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2
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18 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 ...
1
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0answers
18 views

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 ...
4
votes
0answers
21 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 ...
1
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0answers
34 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 ...
1
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1answer
31 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 ...
0
votes
1answer
29 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 ...
1
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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 ...
0
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0answers
19 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 ...
-1
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0answers
16 views

How to spawn a Reverse Shell TCP on a computer remotely [on hold]

I want to know if it's possible to spawn a reverse shell script onto a computer on a local network. I tried looking under the SEtoolkit but it only generates programs that create the backdoor. I want ...
5
votes
1answer
78 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, ...
0
votes
1answer
18 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 ...
1
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1answer
35 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 ...
1
vote
1answer
27 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 ...
0
votes
0answers
10 views

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 ...
0
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0answers
10 views

how to use Solarflare sysjitter tool? [closed]

I've tried Solarflare sysjitter tool to measure delays of my system [oleg@localhost sysjitter-1.1]$ ./sysjitter --runtime 10 200 | column -t sh: /cpusets/tasks: No such file or directory core_i: ...
0
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0answers
54 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 ...
1
vote
2answers
38 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 ...
0
votes
0answers
14 views

creating virtual network interface that tunnels data through plain text fields on webpages [closed]

I would like a network interface to send and receive data encoded as plain text and put into a web page text entry field. There would be another computer at the other side of the page that would ...
2
votes
1answer
23 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 ...
1
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0answers
12 views

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 ...
0
votes
0answers
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, ...
0
votes
2answers
36 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 ...
1
vote
2answers
26 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 > ...
0
votes
0answers
6 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 ...
3
votes
1answer
26 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 ...
1
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0answers
36 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 ...
0
votes
2answers
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 ...
0
votes
0answers
16 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 ...
2
votes
1answer
110 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: ...
0
votes
0answers
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 ...
1
vote
1answer
44 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 ...
1
vote
1answer
32 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 ...
0
votes
0answers
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 ...
1
vote
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 ...
1
vote
1answer
35 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 ...
0
votes
0answers
10 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 ...
1
vote
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 ...
1
vote
0answers
36 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 ...
0
votes
0answers
33 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 ...
0
votes
0answers
21 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 ...
1
vote
1answer
20 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
votes
1answer
34 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?
1
vote
1answer
33 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 ...
0
votes
0answers
23 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 ...
1
vote
1answer
48 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 ...
0
votes
1answer
43 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 ...
0
votes
2answers
49 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 ...
0
votes
0answers
14 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 ...
1
vote
1answer
62 views

How can I create Local Loopback on Linux (Red Hat or Debian)?

How can I do the same on Linux (RedHat or Debian)? I need to create local loopback as shown herein: Performing Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces. Excerpt ...
0
votes
1answer
36 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 ...