A computer network allows sharing of resources and information among interconnected devices.

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Bridging two interfaces for intranet only

We have two ALT linux servers with real IPs. They both are in intranet via commutator. Each of them also has an additional LAN network interface. We want to connect these servers to each other ...
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31 views

How to listen to a specific port and return 200 status

How can I listen on my server on specific port and just return HTTP 200 status if someone tries to connect ? Can nc be used to return HTTP status ?
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49 views

How to check what `wondershaper` has done?

I used this command: sudo wondershaper eth1 20 20 to limit network traffic. The command shows no errors. But I need a command or network monitor or gui which confirms this limitation. For example, ...
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124 views

hostapd will not start via “service” — but will start directly

I am having trouble getting hostapd to start as a service. It fails when I try to start it: $ sudo service hostapd start [FAIL] Starting advanced IEEE 802.11 management: hostapd failed! From what ...
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124 views

Cannot connect to any localhost connections

I'am using Centos 6.5 with latest updates. My problem is that whenever i try to connect to some local service it just hangs for example: wget wget 127.0.0.1 --2014-03-11 12:43:42-- ...
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38 views

tcpdump command works only on local ip

I am trying to capture some IP packets in my personal LAN with tcpdump, through the command tcpdump -A -i eth0 'tcp and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0) ...
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Why does't stopping the nginx server kill the processes associated with it?

When I stop nginx like this on ubuntu 12.04, I get the following errors: $ sudo service nginx stop Stopping nginx: nginx. $sudo service nginx start Starting nginx: nginx: [emerg] bind() to 0.0.0.0:80 ...
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52 views

SSH to Linux Container from Other Machine

I am trying to learn about Linux Containers and this is my first encounter with servers, ssh and many other things that I do not know the terms yet. I create five different containers and authorized ...
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36 views

How can I access networked filesystems that I've mounted in Nautilus?

I've mounted a networked filesystem in GNOME by clicking on the icon in the left of Nautilus. However, when I use the terminal, I can't figure out how to access that filesystem. Is it possible?
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2answers
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Wireless bridged networking in KVM. Why is it so complicated?

I've been using VirtualBox (and sometimes VMWare) for years and I've never had any problem with the virtual network adapters, no matter if the physical ones were wired or not. I also played some time ...
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1answer
192 views

No wired ethernet connection

I'm using elementary OS (based on Ubuntu 12.04) and yesterday I woke up to no wired ethernet connection. As far as I can remember I changed absolutely nothing, it was working at night and not anymore ...
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36 views

Network connectivity problem - Debian 6 server

I'm having a problem with a Debian 6 server where it looses network connectivity and doesn't come back (server does not respond to pings, and can't connect to any services). The problem happens ...
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DHCP lease acquired , yet no ping, not even to default gateway

I've just installed Debian Wheezy on my PC using netinstall. I can only use its wifi. My interface has been recognize by the system, and I've used: iwconfig wlan0 essid MY_HOME_AP (I've switched ...
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1answer
48 views

How to tell what wireless protocols my network card is using?

I want to know which wireless protocol my card is currently using. I found a similar question that tells you what network protocol your card supports, but I want to confirm that my card is actually ...
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1answer
37 views

Forward a host's network traffic to another host with the exception of SSH traffic

I am trying to redirect all the network traffic received in a old host to a different host. For that I created two new rules with iptables on the old host: echo 1 > /proc/sys/net/ipv4/ip_forward ...
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69 views

I'm not able connect internet from vmware player with centos

I installed centos 6.4 and when I installed I set the network config. But somehow centos did not save them. Now I forced server to use dhcp but it is taking wrong IP address and it is not able to ...
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1answer
44 views

Finding data transfer rates on individual TCP/IP connections

In a application that has multiple TCP/IP connections with other applications on a Linux system how can I find the amount of data transferred between individual connections.
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1answer
30 views

How does the kernel know which file descriptor to write data to after fork() in a concurrent server?

Basic concurrent client/server architecture: There's a main loop listening for requests on a port (for example 3000), after accepting the connection the server spawns a child process that ends up ...
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42 views

Get Network activity

I have an embedded board running Linux with http, ftp and some other servers. I need a way to detect when there is no network activity both http, ftp etc. I will make a linux program, that will ...
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1answer
59 views

Does a Virtual Machine Server Have a Web address? [closed]

Hi I'm trying to set up a server for my moodle virtual programming lab. It has something named a jail server that is used to run code remotely. I have a Ubuntu server set up with all the correct ...
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2answers
54 views

Attach to an existing ssh tunnel

I have an existing ssh tunnel which connects machine A to C over B. #user@A: ssh -N user@B -L 9999:C:9999 Is there any way to create a new ssh tunnel on D and attach it to the existing tunnel so ...
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Wheezy:ifconfig etho down - can still ping?

deathstar> ifconfig eth0 down deathstar> ifconfig -a eth0 Link encap:Ethernet HWaddr 00:23:ae:24:f6:76 inet addr:192.168.1.30 Bcast:192.168.1.255 Mask:255.255.255.0 ...
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1answer
35 views

Connect to LAN resource via ssh tunnel

I have the following problem. From machine A I connect to machine B over the internet via ssh and port forwarding. Machine B is part of my local network and has connection to machine C which acts as a ...
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1answer
70 views

Dell D610 6.5 CentOS Installation - Undetected Network Adapters

I've spent the better part of the day attempting to install CentOS 6.5 on an older Dell D610 laptop, using everything from a Minimal Install to the Full DVD. After multiple attempts I was able to ...
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44 views

understanding lsof -i output with web browsing

Sorry, if my question is nooby, but i don't understand some output lsof command. I try to run lsof -i on my home machine(debian linux) and what i obtain (showed one line; my browser chromium was ...
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Beginner's question: Accessing network location on domain

I'm new to Linux so this might seem a little naive! So, my computer is connected to a university network, in the computer science department. This domain is called "cs". However, "cs" is a subdomain ...
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CentOS 5.5 server dropping & blocking connection

I'm running a CentOS release 5.5 (Final) server running the LAMP stack amongst other things. When working on a web project with numerous active connections to the server box (Plesk over HTTP, SSH and ...
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1answer
61 views

Is there any convenient way to run remote program on local data?

I have two servers running Linux, namely A and B. There is a large amount of data on A, but I want to use the program x on B to process those data. It would be inefficient to transfer all data from A ...
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curl unable to find cslistener

netstat shows some connection from my linux box to remote host on their cslistener port. But trying to access that port using curl is giving error : $ curl -v https://myapp.domain.com:cslistener * ...
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generate gateway automatic through resolvconf & can't change my gateway [closed]

my connection is cable ethernate , UEFI mother board i7 intel processor, direct connect no routter, aliance broad band my root process:- #ip link set eno1 up #ip addr add (IP)/(netmask) dev eno1 #ip ...
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29 views

Connecting multiple USB RNDIS devices to PC in the same network

Running an Ubuntu 12.04.4 I have the following issue: I want to connect multiple USB RNDIS devices to one PC. Additionaly, every device should be in the same network. The problem is that only one ...
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1answer
47 views

High RX packet error count with modem - how to analyze?

I'm testing a CDMA modem on my Debian embedded Linux system. I'm doing some wgets of large files and am seeing the connection drop now and then. Looking at the ifconfig output for the PPP interface ...
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Does the order of options in the /etc/network/interface option matter

I'm trying to determine if the order of the options matter I'm using a script (represents an external remote interface) that is updating the /etc/network/interfaces file. The script can set the IP ...
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Configure Debian VPS network to work under an another Debian

I have a very big problem. Our VPS is under DDoS every day and now i bought a DDoS protected second vps temporary (until the main VPS get the DDoS protection). My question is how can i setup the ...
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1answer
25 views

OpenVPN static key ip meaning/order?

I'm following this tutorial. What do the IPs mean after the ifconfig here? dev tun0 ifconfig 10.9.8.1 10.9.8.2 secret /etc/openvpn/static.key Can I use external IPs (assuming I'm configuring this ...
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1answer
38 views

What is the reconnection policy of “persist” switch on “pon” command from pptp-linux package?

I use to establish a connection to my VPN PPTP server by typing: pon MyVPN persist I wanna know the reconnection timing details, but I have not found documentation enough about it. Specifically: ...
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1answer
165 views

Packet loss with RX error packets

I am seeing packet loss from all my blade servers within the HP Blade C7000 enclosure. # ping 192.168.2.140 PING 192.168.2.140 (192.168.2.140) 56(84) bytes of data. 64 bytes from 192.168.2.140: ...
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1answer
21 views

Access USB device of another machine as if it was locally plugged?

I would like to use, on server A, an USB webcam that is physically plugged on server B. Is there a way to mount the /dev/video0 of server B on server A (as /dev/video0, or /dev/video1, etc.). Both ...
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1answer
74 views

Configure guessnet to switch automatically between LAN and WLAN

I want to configure guessnet and wpa_supplicant such that if I plug in my LAN cable, it connect to the network via the cable and if I unplug it, it automatically switches to WLAN and vice versa. I ...
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91 views

What exactly is happening when I run `netctl-auto enable-all`?

My wifi connection has been dying very regularly. I notice when I run netctl-auto enable-all I reconnect within 5 seconds every time. (My connection has dropped twice while posting this.) Why does ...
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1answer
79 views

Change the DNS server in etisalat USB modem

I need to use the open DNS : 208.67.222.222,208.67.220.220 in my network connection. I use etisalat 3.75 USB modem HUAWEI in my Ubuntu 12.04 PC. I had tried to add this DNS in : ...
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59 views

Why does kill not have a parameter for file and not for port number?

If I want to stop a program given its tcp port number or its file or named executable, can I run something like kill -tcpPortNumber $1 where the parameter $1 is a tcp port number or kill -filename $1 ...
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1answer
99 views

How to enable two network interfaces both for internet in ubuntu12.04

My physical server A has two interfaces: eth0 and eth1. I intend to enable the two network interfaces both for internet in ubuntu12.04. I configure the /etc/network/interfaces as below: auto lo iface ...
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1answer
244 views

Configure multiple interfaces with different hostnames using DHCP and DNS

I have a machine running Ubuntu 12.04 Server with two interfaces connected (eth0, eth1) to the network. Our network is set up so that a FreeBSD based DHCP server hands out leases and registers the ...
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1answer
102 views

Share/Stream live video on LAN network - raspberry

As in the question, I need to share a video in lan by broadcasting. From server, I've tried with: avconv -i video.mov -c:v libx264 -f mpegts udp://[destinationIP]:1234 From client I can play ...
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Why are user account on remote server called shell account

Why are user accounts on a remote server called shell account , remote account sounds like a more intuitive name what is the reason behind this very unintuitive name ???
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Find hostapd's access point SSID

I have a Linux machine operating as an access point using hostapd and dnsmasq. The AP is working fine (the device is wlan0), but I am having difficulty finding the SSID of the AP for monitoring ...
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29 views

How to route “single ip” to different interfaces [duplicate]

i have a dd-wrt router (ip 192.168.1.1) with the following network interfaces: eth0 ath0 ppp0 (a pptp vpn client) i would like to route all traffic from ip 192.168.1.10 to 192.168.1.20 through ...
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69 views

Some packets are flagged as INVALID by iptables

I configured a proxypass rule in order to redirect requests from the port 443 to a JBoss server running on port 8080. All works fine except some 503 errors in the Apache log, around 10 per day: In ...
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RNDIS Server to make a computer as a peripheral

First of all my goal is this, have a computer as a peripheral device to connect it to anyone's computer with ssh protocol or web. The idea is doing this by using a plug and play USB cable . Facts ...