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

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ping gateway but not domain

I can ping gateway its ok but when I try ping google.com response is; "unknown host google.com" network-scripts/ifcfg-ens0p3 file content: TYPE="Ethernet" BOOTPROTO="static" IPADDR="192.168.0.14" ...
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1answer
11 views

virtual monitoring interface on wifi card

I only have one wifi nic in my computer, but I want to be able to monitor all traffic while still connecting to a network. I was thinking (if it is possible) to have a physical interface wlan0 ...
2
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0answers
41 views

Wifi interface recognized as ethernet

I am having trouble setting up my wifi configuration persistently. I have tried both netctl and NetworkManager and both only work after manual setup. What I find especially weird is that ip link ...
1
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1answer
28 views

Is there a portable way to get the name of the WiFi card on the command line without additional parsing?

In this tool, the name of the wireless interface is hardcoded to be wlan0. This was a reasonable assumption up through Ubuntu 14.04, but the wireless interface name appears to have changed in Ubuntu ...
2
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1answer
14 views

How can I find out the ownership of a tap interface?

I can set up a persistent Linux tap interface and make it owned by a specific user and group with one of these: tunctl -u someuser -g somegroup -t example.tap ip tuntap add dev example.tap mode tap ...
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3answers
40 views

How to check which network interface is active and providing internet?

ip link show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: eno1: ...
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1answer
39 views

unable to SSH to eth1 after bringing down eth0

I have a remote machine with 2 interfaces: eth0 and eth1. I am able to ssh using eth0 ip address as well as eth1 ip addr. However, things go strange once I bring down eth0 using the command ifdown ...
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1answer
26 views

Ubuntu Server 15.10 doesn't recognize internet card

I just installed ubuntu server (the installer connected to the internet with no troubles), and I cannot get it to connect wirelessly to the internet. I've googled to no avail, as there is no ethX ...
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2answers
33 views

How to use same interfaces settings for all wlan devices

I am working with a pcengines apu2c4 board with debian 8.4 installed.I am quite new to Linux. We use edimax ew-7811un usb wifi adapters. Obviously when you insert a wifi dongle new to the machine it ...
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1answer
15 views

Are IPv6 link-local addresses assigned by the kernel or by a userspace program

When IPv6 is enabled for an interface, it will get a link-local address assigned automatically based on the MAC of the network interface. But who assigns this address? Is it done in the kernel, or by ...
1
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1answer
20 views

Route specific traffic to specific interface

I have two NICs. Basically, I want to use one of them for specific traffic (based on the destination IP or the domain) and the second one for the rest of the trafic. Is this possible? If it is, How ...
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0answers
12 views

Why the virtual interface is down when I establish a layer-3 SSH VPN using “tun” devices

I would like to establish a layer-3 SSH VPN on Ubuntu 14.04. To create a tun virtual device, I used the command ssh -f -w 0:0 root@41.33.17.26 -p 2010 true, it creates the interface 'tun0' but the ...
1
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1answer
29 views

Programmatically determine the IRQs associated with a network interface

What is the most reliable way to programmatically determine the IRQs associated with a network interface, given the name of the interface (e.g. eth0)? I'm okay with a best-effort approach, but I'd ...
1
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0answers
23 views

Userspace Network Stack

I am writing a (very simple) userland IP network stack. For this purpose, I need to go "around" the OS network stack and obtain the raw Ethernet frames. The tap interface sounds like a way to go, but ...
2
votes
1answer
33 views

Why are my if-up.d scripts running before DHCP(v6) has completed?

I'm using DHCP and have both IPv4 and IPv6. I want to run a script that updates an IPv6 DDNS service when my network is configured. I created a script at /etc/network/if-up.d/update_dns however this ...
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0answers
30 views

Broadcom BCM94352HMB wifi card not working

As mentioned above, I got an BCM94352HMB wifi card in my laptop but it does not work (it's not recognized) under pretty new linux kernels (arch linux). So does somebody know if there is support for ...
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0answers
11 views

Ubuntu: Wifi access point clients constanlty reconnect to AP

I did on my Ubuntu 14 LTS PC WiFi access point using this how-to https://www.quora.com/How-do-I-create-hotspots-in-Ubuntu-14-04 . So from clients I can use internet but the connection is very slow. ...
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2answers
47 views

Ubuntu: I cannot reach internet

I'm trying to install nodejs on my Ubuntu server but it seems not to be able to reach the internet. My server has two network interfaces: eth0 connected to my network eth1 used sometimes to be ...
0
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1answer
35 views

Flapping Ethernet connection of Fedora 23

Since a few days I am experiencing a flapping Ethernet connection on my Fedora 23 laptop: the network connection goes down for several seconds every minute. The machine is up-to-date with the latest ...
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2answers
77 views

driver for Ralink USB RT2870 --> 148f:7601

I bought the Ralink USB Network Interface device listed below $lsusb Bus 004 Device 002: ID 148f:7601 Ralink Technology, Corp. And I've looked at many threads which all point to the same chipset ...
1
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0answers
16 views

'ip netns exec' command execution using nsid obtained from 'ip netns list-id'

I have previously used ip netns exec command to modify netns interfaces. But if there is no name associated with a netns (eg: docker), how can I use nsid result of ip netns list-id command for ...
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0answers
27 views

Alfa Network Atheros AR9271 not works under Debian

I'm trying to use the Alfa network Atheros AR9271 but not works, when I execute the following command lsusb I got: Bus 001 Device 035: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n I ...
3
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2answers
96 views

(Raspian) DHCP startup race conditions - lots of service failures at startup (no DNS for ~5-10 seconds)

(Edit: This applies to much more than postfix; it's just where I noticed/debugged it) I've installed postfix, but when it starts up and creates its chroot, it gets an empty copy of /etc/resolv.conf ...
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0answers
14 views

Why does `ping -M do -s 8000` still work between hosts with different MTU values?

I have two hosts: alice (192.168.0.1, mtu 9000) bob (192.168.0.2, mtu 1500) They are directly connected with a cat 6 cable, with no switch in between. Why is it that I can still ping bob from ...
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0answers
24 views

ip link up with empty line

case: # eth0.cfg The primary network interface auto eth0 iface eth0 inet static address IP-1 netmask 255.255.255.255 broadcast IP-1 post-up ip addr add 192.168.100.254/24 dev ...
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1answer
34 views

Where to look for systemd-networkd device names?

I'm running Debian Jessie/8.2 on an ARM single board computer with systemd. I'd like to entertain using systemd-networkd instead of the ifup mechanisms. One of the apparent steps, is to figure out the ...
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1answer
49 views

Setting static ip address for multiple ethernet controller

I have a simple question for which I couldn't find a answer for hours on the internet. I didn't think it's so much special what I want to do, but it seems to be. I have Debian virtual machine within ...
3
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0answers
36 views

Linux + why dropping issue displayed from ifconfig but not from ethtool?

we have Linux VM red hat 7.2 version with two LAN interfaces the Linux machines are ruining on ESXi - 5.5.0 and we have very strange issue , the conflict is between the ifconfig command to ethtool ...
1
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2answers
51 views

Retrieve name of the active network interface only [duplicate]

How can I retrieve from the command line (or a shell script) only the name of the active network interface, in Linux? If there are several active interfaces, I want just one (selected arbitrarily).
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1answer
102 views

How to determine the logical type of a linux network device

with logical I mean everything legal in the command ip link as in, for instance: ip link add link dum0 name dum0.200 type vlan protocol 802.1Q id 200 where the logical type would be "vlan". All ...
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0answers
78 views

A way to setup hotspot in Kali Sana (Kali 2.0) via XFCE

I'm finding it extremely difficult to figure out to create a successful hotspot using Kali Sana after having it updated to XFCE, installing all updates via apt-get install update. I've tested the ...
0
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1answer
88 views

Routing Problem with IP Forwarding on Ubuntu 14.04 and VirtualBox

I'm not entirely sure how to best title this question as the set up is a little complicated... but basically I have a routing problem with IP forwarding on my ubuntu server. On my ubuntu server (an ...
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0answers
50 views

Linux Packet Drops Increasing Over Time

I have Linux machine red-hat version 7.1 ( VM machine ) I see that dropped value increase every second!!! Please advice how to find the problem , and if red-hat 7.1 need some patch update in order ...
0
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1answer
72 views

Installing Netis WF2190 driver on Ubuntu 14.04 w/ kernel 4.2.0-27-generic gives me an error: implicit declaration of function ‘strnicmp’

Linux # lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 14.04.4 LTS Release: 14.04 Codename: trusty uname # uname -a Linux qb123 4.2.0-27-generic ...
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0answers
31 views

CJDNS `Network is unreachable`

I'm not shure if this question belongs here, but anyway. I was trying to run cjdns on my android phone (OnePlus One runnig CyanogenMod 13) (actually tried on several devices), but it ain't working. It ...
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0answers
41 views

Red Hat vNIC(Virtual NIC) association to physical NIC

I have a virtual network interface named bond0.700 connected to a vlan (ID 700), and 6 physical NIC (eth0 to 5) on RHEL 5.5. Hint : [root@rhle ~]$ cd /sys/devices/virtual/net [root@rhle net]$ ls ...
0
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1answer
46 views

CentOS “service network restart” FAILED - where is the error log?

In CentOS, I ran the following command. But it doesn't give me explicit errors to investigate. How can I troubleshoot further or find the errors? service network restart
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0answers
15 views

Is there a tool or a command to change the “tagtype” from VLAN tags (single and double tag) before sending the frame over a VLAN Interface?

I have to talk to a device in a VLAN network. It requires that the tagtype field of both VLAN tags are the value 9100 or it refuses to answer. Thanks
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0answers
24 views

No internet connection after reboot

I rebooted my vServer (Debian 8) and it doesn't came back up. Well, I used the rescue console on my server and the server seems to be running fine, except the network was broken. So I tried 'ifconfig' ...
3
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0answers
13 views

Limit access/transmit rights on NIC to a single user application

I currently have a RT patched linux machine and I need to have full and undelayed access to my Wired interface card. I am running a realtime non-preemtable user application which sends a couple of ...
0
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1answer
25 views

Hosts are not found by server after restart and require manual input of DNS server to work

My Raspbian server "forgets" it's hosts after resrtat. The only solution that I have found is to manually run: sudo sh -c 'echo "nameserver 8.8.8.8" >> /etc/resolv.conf' However, it is ...
0
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2answers
49 views

How to run a script upon IP change

My Debian machine is currently part of my home LAN, behind the ISP box which handles all network related activities (DHCP, firewalling, telephony, IPTV, ...). A classical case of residential home ...
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1answer
36 views

Where is wpa-conf documented?

I use wpa-conf in /etc/network/interfaces to make the WLAN interface automatically connect to the AP: # This file describes the network interfaces available on your system # and how to activate them. ...
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3answers
185 views

Putting a network interface up/down from command line

In Xubuntu 14.04, I tried to use both ip and ifconfig to handle a network interface, but they gave the same result. $ sudo ifconfig wlan0 down $ sudo ip link set wlan0 down both correcly put down ...
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2answers
202 views

rtl8821ae Wifi driver

I've been having problems with my wifi connection (rtl8821ae driver). I can stay connected for hours (as long as 6 hours) and then sometimes it just crashes and doesn't work on reboot...have to wait ...
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0answers
41 views

How to make an iproute2 bridge setup permanent?

I've set up an archlinux inside a Oracle Virtual Box. To be able to reach the VM from the LAN I have added a bridge adapter and configured the guest system following the instructions from the Arch ...
3
votes
1answer
67 views

How to have a device's IP discovered in a network in a simple manner?

At the startup I work, we're setting up a device for image capturing and analysis. It's a box with a camera, with ubuntu linux embedded, and, let's assume, we don't want to connect a monitor to this ...
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0answers
48 views

“link is not ready” error, vanishing network interfaces

I recently had a weird problem when trying to use airmon-ng. Here is its description: First, I plug in my USB WLAN adapter, and type ifconfig. Everything goes well and I see all interfaces are ...
1
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1answer
39 views

Multiple network interfaces and airmon-ng

Before using airmon-ng on a network interface, you now have to do : airmon-ng check kill This is essential in order to be able to put any interface in monitor mode, but it stops the service ...
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1answer
21 views

How to manage network adapters?

Let's pretend i have two wireless adapters, one is usb and one is pci and they are named wlan0 and wlan1. Is there an easy (and graphical, if possible) way to force applications to use one adapter or ...