hardware (or its representation by software) that connects a computing device (host) to a computer network (net)

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DNS Issue in ubuntu 14.04

I am facing DNS resolving issue sometimes in my Ubuntu 14.04.2 LTS trusty. I have configured my system with network manager to work with static IP assignment. I have also tried by changing DNS server ...
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0answers
16 views

Debian won't accept my network's password during installation

I'm trying to install Debian Jessie on a Toshiba Satellite M45-S331, but I'm stuck on the "Configure the network" step. I successfully installed the firmware for my wireless card, and I am able to ...
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0answers
27 views

CentOS 7 - Rename network interface without rebooting

I'm renaming network interfaces by modifying the files in /etc/sysconfig/network-scripts. eth0 -> nic0 eth1 -> nic1 The content of the the network scripts looks like this, after modification: # ...
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0answers
21 views

Make OpenVPN restart upon new network connection on systemd

How would you go about making OpenVPN automatically restart upon connecting to a network? The issue is that every time a network connection is lost, or if the computer is booted without a network ...
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0answers
11 views

Installing huawei Linux driver on fedora 20

I want to use huawei e303f data card on fedora 20 32 bit. I have downloaded the Linux huawei driver. But when I try to install it , it pauses for an indefinite period after the line that's reads '1:4 ...
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42 views

Interfaces, IPTables, Connections, Local Connection - Confused :/

I configured my iptables today and ran into some questions i could not resolve yet. So it would be nice, if someone could verify or answer the following to clarify: Each interface can be configured ...
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2answers
34 views

why do some network cards need to load external firmware?

I have read this question/answer, but I still do not understand why some network cards work perfectly well without any additional firmware, whereas others need to load firmware to work. As a specific ...
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1answer
31 views

Forward traffic coming into dummy interface on to another interface(?)

Can I forward traffic coming into a dummy interface on to another interface? Or is it not a real interface at all even? Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot ...
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1answer
38 views

Set NetworkManager to ignore rfkill

My notebook does not have a hardware button to disable wireless. But NetworkManager and rfkill see wireless as hard blocked. Wicd and iwconfig works well. Is there any way to disable hard block check ...
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1answer
51 views

Suse 13.2 fails to connect to router

NetworkManager appears to be running, however cannot connect to router. I am in my first days of using a new computer with a then newly loaded opensuse 13.2. The first few days all appeared to ...
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0answers
41 views

Interface doesn't go up with ip link set interface up

Until yesterday, Internet was just fine and I connected without much problems. I then disabled the network interface, trying to understand a little more how to manage these kind of things, issuing ...
2
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1answer
23 views

post-up only once after reboot

I need to run a script ONCE the first time the system connects to the internet. So I use post-up in my interface to run the script. However, I only want to run the script once per boot. So if the ...
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1answer
17 views

WiFi cycle with hostapd

I'm using hostapd to broadcast my wireless network. I'm cycling through a list of config files. I'm able to create a wireless network the first time, but as soon as I'm trying to cycle to the next one ...
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1answer
64 views

Create a loopback interface and make it permanent (FreeBSD)

I create a loopback interface using: #ifconfig lo1 create The problem is when I reboot the machine I loose my configuration. I tried to modify the /etc/rc.conf file but I didn't figure the right way ...
2
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1answer
33 views

Please help me to understand these tun0 addresses

I have already done some searching and more or less understand what a tun0 interface does. I got the following from various sources, Packets sent by an operating system via a tun/tap device are ...
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0answers
34 views

Is there a way to emulate a wireless card in qemu / kvm?

Is there a way to emulate a wireless card in qemu / kvm? Or is there no point to this? Is it considered just another interface?
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2answers
69 views

How to find out which process keeps tunnel interface(tun) up?

If I create a tun interface with ip tuntap add mode tun command and force it administratively up with ip link set dev tun1 up command, then the interface itself is always "physically" down: ...
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1answer
32 views

Network UNCLAIMED - Unable to access internet

My Kubuntu was working well until I think a day ago, and suddenly I don't have access to Wi-Fi. I've tried turning on the connection via the Connection editor but the box was grayed out. After looking ...
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2answers
59 views

What exactly happens in Linux internally when an ethernet cable is connected?

I would like to understand what exactly happens when a cable is being connected to the Ethernet port (assuming dynamic IP addressing): What services are being run and how are they triggered? What ...
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1answer
87 views

Enable Promiscous mode in CentOS 7

How to enable promiscuous mode on network adapter. I have tried by adding PROMISC=yes in /etc/sysconfig/network-scripts/ifcfg-ensxxx but no effect even after network restart or rebooting the system.
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1answer
55 views

How do I disable network interfaces from loading at boot without Network Manager?

The machine I'm using has 4 network interfaces, only one of which is currently being used (the other 3 are not plugged in at all). Currently when the machine is restarted it is delayed by a few ...
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0answers
45 views

Is it possible to set interface name permanently in Raspbian?

I'm using 2 wifi dongles. First one is used to monitor and second one is used to access internet. Even if I changed /etc/udev/rules.d/70-persistent-net.rules as below, at startup sometimes wlan0 ...
2
votes
1answer
90 views

Device eth0 does not seem to be present, delaying initialization

I have cloned a fedora and now trying to configure network interfaces. Every time i am adding a new NIC, it starts with number eth3 (rather eth0). i have tried removing and modifying the ...
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0answers
18 views

installing r8168 driver in centos 4.8

I have installed cent os 4.8 and I am not able to connect to internet from that system. After searching on the net I found that the system has r8169 driver instead of r8168. Now I am trying to ...
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1answer
87 views

ifconfig not showing ip address under eth0

Usually when I connect my raspberry pi to my laptop using an ethernet cable, the ifconfig command in each computer would show the ipaddress of each computer under eth0. I recently got a new raspberry ...
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1answer
75 views

Set a local static IP address on a network interface and have it permanent even after restart

I have openSUSE 13.2. My laptop connects to the internet through a WiFi network but I have an embedded device which I need to connect to it through the ethernet interface. It has an IP address of ...
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0answers
28 views

Change of Network Interface using Metrics

I want to achieve dynamic interface change between eth0 and wlan0, one solution I am looking into is to change interface metric. Different than this question, I don't want to make any change to ...
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0answers
32 views

command line tool group chat utility under linux

I am working on mac osx Yosemite. I want to reach to a user under a certain IP address. (It might be local network or thru internet). I want to do it thru terminal using the default tools that ...
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0answers
54 views

How to update ip in hosts file automatically from a VirtualBox guest?

I have a VirtualBox guest running Debian with Bridged Adapter. The host is running on Windows 8. I would like to connect from the host to the guest through a specific port. I came up with the ...
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1answer
46 views

What is a hotplug event from the interface?

According to Debian Network setup document allow-hotplug <interface_name> stanza in /etc/network/interfaces file starts an interface when the kernel detects a hotplug event from the interface. ...
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1answer
32 views

Connect through different interfaces to the same server

i have two pppoe interfaces - ppp0 and ppp1. I would like to reach the same server on both interface. I added the desired ip address to the route table: route add 10.88.40.13 ppp0 And I could ...
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1answer
29 views

I need dhclient to flush IP address/routes when link goes down

I am running one Ubuntu Server 14.04 with network configuration using /etc/network/interfaces and so ifup/ifdown scripts. I realised that if I configure one interface in DHCP mode, then I unplug the ...
2
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0answers
75 views

Where does BPF packet capture read its data from?

I am interested in the low-level interfacing with network packets. From what I read, tools like tcpdump and libpcap use the BPF packet filter device /dev/bpf* to read link-layer network packets (on ...
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0answers
15 views

Fair traffic classification using TC

I want to apply a qdisc I developed on myself (quite similar to netem. Think netem.) to several IP-addresses using the filter classifier. No problem this far, I could do so using the prio qdisc or HTB ...
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1answer
40 views

How do I limit inbound and outbound bandwidth to and from a specific host on CentOS

As the title says, I am trying to limit inbound and outbound bandwidth to and from a specific host on CentOS. The reason is that this host consistently uses a large amount of bandwidth and this needs ...
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1answer
32 views

Possible to reserve a network interface for exclusive use?

Like the headline says: is this possible in Linux at all? How would one implement a completely silent packet sniffer? I would like to take the interface away and give it back to the OS at will, if ...
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1answer
188 views

Problem with routing tables network interface in Centos 6.6

I've problem with the routing tables, I've 2 network interface. (2 interfaces with 2 difference network address IP address: 112.xxx.xxx.xxx: static IP and 10.xxx.xxx.xxx local IP) 1: IP address is: ...
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0answers
26 views

net scripts try to up old physical removed network interface

Situation: Gentoo with kernel 3.8.4 amd64 udev 218 no systemd, no initram, no old network udev rules Previously 3 network interfaces (2 x onboard, 1 pci , all r8189 module ones) After an short ...
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1answer
81 views

Permanently disable IPv6, for a given interface?

I'm looking to permanently disable IPv6 on a specific interface because it's broken and my question on Superuser to fix it is dead so how can I go about doing that? I've added ...
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vote
1answer
239 views

CentOS 6 interfaces bonding, round-robin instead of active-backup, duplicates frames

Two interfaces, eth0 and eth1 are part of a network bonding bond0 on CentOS 6. All worked well under CentOS 5, but after the upgrade to CentOS 6.6, keeping the same configuration, the network works ...
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140 views

How can I run script without root to sniff network (libpcap)?

I have a script (in ruby): require 'ffi/pcap' pcap = FFI::PCap::Live.new(:dev => "wlan0", :timeout => 1) pcap.loop() do |this,pkt| puts pkt.body end When I try to run the script , I get ...
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2answers
41 views

Virtual interface and different IPs

I've created a virtual interface on wlan0 with the ifconfig comand and here is what I have: wlan0 Link encap:Ethernet IndirizzoHW c4:46:19:69:b7:a5 indirizzo inet:192.168.1.4 ...
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2answers
85 views

How can I find the name of my Network Interface [closed]

I have a project that requires me to scan the local network. I found a program on the internet that allows the local network scanner condition, but I brought the gold @ IP argument in my network ...
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0answers
8 views

RHEL 5 box constantly displaying NIC statistics on console screen, how can I disable this?

I have a RHEL 5 box that is constantly displaying nic statistics on the console screen when using the KVM. This makes it very hard to do any troubleshooting when the box goes down as these statistics ...
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0answers
78 views

Unable To Bridge Two Teamed Interfaces - Advice?

Before the wall of code I'll explain the situation. I'm trying to set up two interfaces to be teamed together, and from that team create a bridge. I've been studying for the RHCE and I believe this ...
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1answer
41 views

Can't connect Wifi devices to router when wired Ethernet computer is connected

I have a arch desktop with samba and ssh configured connected to a WiFi router/ADSL2 modem via ethernet. I was not able to connect any of my mobile devices (phones and tablet) or my netbook (running ...
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1answer
77 views

Link Local IPv6 address keeps being automatically assigned

I'm looking to prevent the IPv6 link local address from being randomly assigned. I'm not looking to disable v6 but rather statically assign my own link local. I've done ifconfig vboxnet0 inet6 add ...
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1answer
38 views

Manual network setting on Solaris 10

Am using Solaris 10 on Virtual Box. While installing I chose to assign IP manually. IP address: 192.168.1.46 Subnet: 255.255.255.0 Gateway: 192.168.1.1 Now when I ping my Solaris machine with other ...
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1answer
159 views

Unable to connect to internet from Centos VM

I am using VirtualBox 4.3, I have installed centos 6.3. I have two adpaters attached. 1) NAT 2) Host-Only I want to be able to setup a cluster of 3 machines which can talk to each other and also be ...
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0answers
75 views

Is there a way to find the uptime of a network card in unix?

Some of the information i am requesting can be gleaned from /var/log/syslog , e.g: grep wlan /var/log/syslog But the usefulness of that information also depends on how you are network connecting; ...