Managing and using network connectivity on a unix system

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43 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 ...
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57 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 ...
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1answer
73 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 ...
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1answer
62 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 ...
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2answers
80 views

why I can't see the interface in Linux Debian [closed]

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 ...
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22 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 ...
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1answer
128 views

How can I create Local Loopback on Linux?

I need to create local loopback as shown herein: Performing Loopback Testing for Fast Ethernet and Gigabit Ethernet Interfaces. Excerpt Configure a Local Loopback Action To configure a local ...
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2answers
81 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 ...
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1answer
43 views

How to return Uptime of successful OpenVPN connection

I'm trying to figure out how to return the UP Time of a successful OpenVPN connection. I've tried different variants of the following code: #!/bin/bash TMP=$(grep 'tun0: link up' /var/log/syslog* | ...
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26 views

Find out the cause of “Hard Block”

I have a Beaglebone Black I managed to install wifi drivers, find networks to connect to, but I always fail to do so. Apparently rfkill is setting Hard Block which is ( correct me if I'm wrong) ...
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2answers
64 views

What does this host means ' ::1 '

To secure my mysql server, I checked the list of users : mysql> SELECT User,Host,Password FROM mysql.user; +------------------+-----------+-------------------------------------------+ | User ...
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0answers
71 views

How to exclude LAN traffic with iptraf-ng?

I'd like to use iptraf-ng to see how much data my machine is sending/receiving from the Internet, but I want to exclude traffic on my LAN as I am only interested in data going off-site. I have ...
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28 views

How is it possible to send ping to all 127.0.0.0/8 successfully? [duplicate]

I have some wonders about 127.0.0.0/8 network and have 2 question about it. Firstly, why 127.0.0.0/8 is not considered as private network? I wonder this because wiki page does not mention about it. ...
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0answers
46 views

Where to find a basic tutorial/book on Linux networking? [closed]

I am not sure this question is eligible for this forum, so if not, please provide which forum is more suitable for this question. What I am looking for is a basic introduction in how networks work ...
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90 views

how to route traffic on port to ip:port on linux?

I'm trying to route all traffic on port udp 5000 to udp 192.168.0.1:12333 with the following command: $ iptables -t nat -A PREROUTING -p udp -m udp --dport 5000 \ -j DNAT --to 192.168.0.1:12333 ...
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0answers
137 views

VirtualBox guest machine as a nginx host

I have VirtualBox 4.3.12 with Fedora 20 and nginx 1.4.7 installed. Machine has Bridged Network interface and pings can be done both ways: from host machine (Windows 7) using ping 192.168.0.15 ...
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0answers
62 views

Configuring pulseaudio for receive mode

I am working on a project where I'll be running PulseAudio in receive mode on my raspberry pi. As for the server side, we've been writing a custom application on windows that will send an RTP audio ...
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0answers
39 views

Where do the frame overruns come from?

I have a network setup like this: +------------------------+ | Switch | | | +---------+-----+----+---+ | | | | ...
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69 views

How to bridge a VM to public IP

I wish to to assign the IP from my eth1:2 to a VM; I also have no use of this IP for the host, it would be desirable to be exclusive to the VM. I've ended up with a setup just like this (eth1:1, ...
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1answer
386 views

recvmsg returns 'EAGAIN (Resource temporarily unavailable)'

After a recent server move, we are troubleshooting this wierd issue of one of the server losing n/w connectivity for no apparent reason and regaining the connectivity in a few seconds or minutes. ...
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2answers
77 views

How to get the list of ports which are free in a Unix server

I have a requirement to know which all ports in my Solaris machine are free to be used for any kind of network communication. I tried the netstat -a command. But the information returned didn't give ...
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3answers
161 views

Generate networking configuration files using sed and bash

I am a bit rusty on my scripting abilities and am trying to find a good starting point for creating a script that creates files (generating new file names) and edits the IP address in the file by ...
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1answer
38 views

Understanding NAT concepts

I began learning networking on Linux, and I am looking for a way to associate a particular IP to a particular MAC address (i.e. a way to edit the NAT table?). Actually I am trying to assign some IPs ...
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42 views

Using PulseAudio to receive RTP audio stream

I'm trying to set up simple communication between my Ubuntu distro and my Rasbian distro on the raspberry pi. I'm more concerned about the rPi side of this project. I've been looking around the ...
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1answer
36 views

Understanding linux Bridging

I have started learning networking and recently been through bridging in Linux. Bridge in Linux could be set in two ways as far as I have got by reading on internet i.e. either by bridge-utils ...
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1answer
608 views

wget is unable to resolve host address 80% of the time

I have a wget 'http://xxxx.net/somepage.asp?params@abc' in a bash file. When I run it, four out of five times it says: Resolving xxxx.net (xxxx.net)... failed: No address associated with hostname. ...
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24 views

How can I display an altered Network-icon to show when downloading is in progress? [closed]

Summary: When downloading is in progress, how can I change the appearance of the icon (in the Panel) which shows that the Network Connection is enabled? I realise this means using a different icon. I ...
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1answer
21 views

Xen and Networking

I'm using Xen 4.1 I have a (debian) host with 1 ethernet adapter on 172.16.1.0/24 range, static configuration. I want to have various (centOS) guests, that will be on a different network: ...
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1answer
23 views

Network translation, one to one, not one to many

Desired scenario: a small subnetwork of Linux machines, all accessible through another Linux machine (acting as an IP router). These machines would be pre-configured with addresses on a private ...
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24 views

how to connect to VPN only when ethernet is down and 3g is up

is the following possible and how could it be implemented. set up /etc/network/interfaces file so the VPN "tunnel" only connects when the ethernet cable is disconnected and the 3G interface "ppp0" is ...
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1answer
108 views

/etc/network/interfaces not loading correctly at boot

I'm trying to use my Beagleboard Black as a wireless access point (using hostapd and dnsmasq). I've found that I can connect (I'm assigned an IP address, get a DNS Server and Default Route), but I am ...
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2answers
23 views

Trying to connect through cl

I am trying with: $ sudo iwconfig wlan0 essid mynetwork key 4bare2011 $ sudo iwconfig wlan0 essid mynetwork key 4bare2011 mode Managed and similar combinations. I'm using Ubuntu 14.04. The key ...
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78 views

centos virtual machine not registering with intranet dns server

When I am creating a Ubuntu virtual machine on virtual box it automatically registered with DNS server in my intranet network, it has both intranet IP and domain name. When creating CentOS virtual ...
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1answer
76 views

Debian Jessie: My LAN is not working!

I can connect to the Internet without a problem by using wireless networks. I have a DSL connection on defined which can connect to the Internet when LAN is connected. When I plug-in network cable, ...
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0answers
20 views

iptables packet header capture and compare

We are using multicast program to listen up multicast data from our provider, there are couple cases where the multicast having issue: 1. their server hang, hence no multicast data received from our ...
2
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1answer
262 views

I can ping internal to outside but not from outside to internal (Static IP)?

I have a static IP provided by the administrator of my Linux CentOS 6.5. The problem is that while I can ping this machine, connect to it and use it to access the internet from within my network, I ...
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0answers
110 views

how to open up socks/SSH on different network interfaces?

iptables -A PREROUTING -i usb0 -t mangle -p tcp --dport 8080 -j MARK --set-mark 1 iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain ...
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1answer
50 views

Configuring Named DNS zones (Centos7), specifically CNAME

having trouble with some DNS configuration, I have managed to get part of the site working, however adding the prefix 'www', I'm finding a little tricky. Essentially, what I want is mysite.net -> ...
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2answers
141 views

how to test if can connect to port in rhel 7 (telnet client?)

On my local machine some network application is launched on port 3333 and I want to check that it "accepts connections". In this case in Windows I just type telnet to launch telnet client, and then o ...
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0answers
34 views

Execute CGI scripts on custom OMAP4 board as root

I have a Ubuntu 12.04 Custom Board running Apache2. I have a web page which calls a CGI script which is responsible for starting and stopping ipsec service. I access the web page from another machine ...
2
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1answer
81 views

Does each network packet cause an interrupt to CPU?

While I know that lot of packet processing(CRC calculations, packet segmentation handling, etc) can be offloaded to NIC, then does each packet still cause an interrupt to CPU? Is there a difference if ...
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31 views

System wide proxy with encypted ISA server request

I recently install Linux Mint Debian on my computer. It is working fine and I also have internet. But just firefox is able to get through the proxy. After some research I found out that the ISA ...
1
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1answer
115 views

ubuntu 13.04 wifi lost connection - how to get it work again? (broadcom4313)

I am new to ubuntu, meaning I have a lack of funded knowledge and skills, but I hope I provide any necessary information you need to know for solving the problem. My problem is that I moved to a new ...
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1answer
177 views

Route Client Traffic Through VPN Tunnel

I have configured a vps following this tutorial, the server and client are successfully connected and can ping each other, server is at 10.8.0.1 and the connected client (android-OpenVPN Connect) get ...
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0answers
29 views

Bridging/Sharing a networkable printer in freebsd

I'm trying to "bridge" a ricoh laser printer to the rest of my network with a freebsd box, I have some other services running on there, such as mediatomb and have been using it as a file/media server. ...
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24 views

Use more than one provider [closed]

I wanna know of it is possible to bond my network interfaces, so that I can use two or more different providers and combine the speed of those. Is this possible and how?
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187 views

Port Forward For OpenVpn

I have setup a OpenVPN server on CentOS 6, and it starts ok when i /etc/init.d/openvpn start it shows me Starting openvpn: [ OK ] so far so good, but ...
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0answers
21 views

Internet not working on GNOME

I am running all my systems on a windows platform. I am having a PC with the above mentioned OS (This PC is introduced specifically for a project). On this PC I had given the IP address in the range ...
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1answer
41 views

Converting unix command to windows [closed]

I have been provided a command to use in unix, however, I want to perfrom the same operation in windows. Is it possible ? It's a network configuration command that apparently interacts with a server ? ...
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1answer
72 views

Frequently Internet Disconnects

I have installed RHEL 5.8 on IMB server. Also I have configured static IP through eth0. When I try to ping any website e.g. google.com, yahoo.com It works only for 25-40 seconds and internet ...