Tagged Questions

Managing and using network connectivity on a unix system

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0
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0answers
9 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 ...
1
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0answers
27 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
5 views

Cannot connect to the server through host machine that I created in guest machine in Linux Mint [migrated]

Using virtualbox I am running a server on Linux-Mint(guest) and client machine is windows-8 (host). When I try to connect to the server (which looks like http://169.254.158.126:8080) from windows-8, ...
1
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0answers
25 views

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

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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0answers
19 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 ...
1
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0answers
27 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 ...
2
votes
0answers
9 views

Communicating between PulseAudio on linux and custom server on windows

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 RTP audio ...
1
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0answers
16 views

Where do the frame overruns come from?

I have a network setup like this: +------------------------+ | Switch | | | +---------+-----+----+---+ | | | | ...
0
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0answers
22 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, ...
2
votes
1answer
40 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. ...
0
votes
2answers
46 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 ...
1
vote
3answers
50 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 ...
0
votes
1answer
28 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 ...
0
votes
0answers
4 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 ...
0
votes
1answer
28 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 ...
1
vote
1answer
137 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. ...
1
vote
0answers
21 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 ...
1
vote
1answer
14 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: ...
1
vote
1answer
12 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 ...
0
votes
0answers
6 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 ...
1
vote
1answer
21 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 ...
1
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2answers
20 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 ...
1
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0answers
27 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 ...
1
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0answers
24 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, ...
1
vote
0answers
7 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
votes
1answer
39 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 ...
2
votes
0answers
23 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 ...
1
vote
1answer
16 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 -> ...
0
votes
1answer
29 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 ...
2
votes
0answers
18 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
votes
1answer
44 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 ...
1
vote
0answers
16 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
vote
1answer
31 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 ...
0
votes
1answer
56 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 ...
1
vote
0answers
17 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. ...
1
vote
0answers
22 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?
1
vote
0answers
53 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 ...
1
vote
0answers
17 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 ...
1
vote
1answer
30 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 ? ...
0
votes
1answer
28 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 ...
0
votes
2answers
39 views

Ubuntu cannot find or detect new wired network adapter

I want to use two ethernet cards on my machine. So I've physically inserted the new ethernet card in to my machine. However when enter the ifconfig -a command Ubuntu cannot find or detect the new ...
1
vote
1answer
71 views

BOOTPROTO=none | static | dhcp and /etc/resolv.conf

What does it mean when it says BOOTPROTO=none in the /etc/sysconfig/network-scripts/ifcfg-eth0 file. I remember there used to be BOOTPROTO=static and it was very clear and straight-forward in telling ...
1
vote
0answers
69 views

How to route pakets from an aliased interface towards a gateway?

I'm having trouble setting up the following: Router IP: 192.168.1.1 PC Eth0 - 192.168.1.104 Eth0:1 - 10.0.0.1 (must be an alias) Besides ip_forward enabled, what should I add to iptables rules, so ...
3
votes
0answers
41 views

Unable to start network, <IP> is already in use for device eth0, but its not

A wierd issue after we migrated some of our servers to a new DC. We assigned new IPs to all the machines and all the servers are working fine except one. It is not picking up the new IP address and ...
1
vote
0answers
3 views

Nas/Switch/ DD-WRT Router, Interesting Problem [migrated]

I had a network setup that consisted of the following. WNR2200 [router] with DDWRT [Firmware: DD-WRT v24-sp2 (06/23/14) std] running on it, connected to a Netgear 8p Gigabit [Switch]. My laptop and ...
2
votes
4answers
72 views

How to display the IP address of the default Interface with Internet connection?

I need to create a script that outputs the internal IP address, that is configured as the default Interface.
2
votes
3answers
78 views

Bridge/Router with custom logic

I've a Linux box with 3 network adapaters, which I'd like to configure as follow: Adapter A is connected to computer A Adapter B is connected to computer B Adapter C is connected to the Internet. ...
1
vote
1answer
89 views

Network interface not registring ARP response

I have a server with two NIC and it's running Ubuntu Server 14.04. The first one is the interface "p3p1" and it's connected to the subnet 192.168.1.0/24 with the IP 192.168.1.100. The second one is ...
0
votes
1answer
46 views

How to forward IP traffic between wlan0 and eth0 without killing network performance on the forwarding machine

I have a laptop running Debian 7 that connects to my building's Wifi. I want so share this network connection via the laptop's Ethernet port. I have setup a script below to do this based on some ...
2
votes
3answers
76 views

What's the most effective way to detect nmap scans?

As the title says, I am interested in detecting any nmap scans directed on a (my) GNU/Linux host. I would like to use snort in combination with barnyard2 and snorby for this, or if possible to perform ...