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Questions tagged [network-interface]

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

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LTE Modem not working in 1 out of 20 boots

I have an embedded device that runs Ubuntu 16.04 and has a LTE modem connected to it. The modem usually works normally on boot and shows up as usb2 device (when using ifconfig). It also gives my ...
0
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1answer
45 views

For veth pair, ping does not recognize interface name and tc qdisc netem does not work

I have Ubuntu 16.04 LTS with hwe kernel 4.13.0-39-generic. I configure the veth pair in the default network namespace as follows: $ sudo ip link add h1-eth0 type veth peer name h2-eth0 $ sudo ip ...
0
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0answers
14 views

Unable to mount from the newly added second interface of a Ubuntu NFS server

I have a Ubuntu NFS server with single interface (just one IP address i.e 192.168.1.13) configured for both network and storage traffic. To avoid performance issues, I have got the second interface ...
1
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0answers
42 views

Network interface with unknown speed

When I try to print the maximal throughput of my network interface, I receive an error: $ cat /sys/class/net/<interface>/speed cat: /sys/class/net/<interface>/speed: Invalid argument ...
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0answers
29 views

Debian Systemd: Wifi network configuration waits at boot, connects after boot

This has been plaguing me since I updated to Debian 8. Everyone is probably familiar with the "A start job is running for wait for network to be configured" message, and how prevalent it was for a ...
0
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1answer
21 views

Should I configure the DNS2 to an other company's DNS address?

When I configure the interface's DNS, we often configure 8.8.8.8 and 8.8.4.4, but I have a question, because the 8.8.8.8 and 8.8.4.4 all are belong to google. will the bellow be better than the ...
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0answers
36 views

ARP requests sent from wrong interface on Hostapd managed access point

I am trying to setup a wireless access point, managed by Hostapd and with dynamic VLAN support. The VLANs are managed dynamically by a FreeRadius server that I use for 802.X authentication. I am ...
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0answers
45 views

Can't get IP from router with Static IP

I am trying to setup my computer to use a Static IP. Here is what my /etc/network/interfaces file looks like: auto lo iface lo inet loopback iface eth0 inet static address 192.168.1.128 ...
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0answers
52 views

Bring interface up even if link is down (no carrier)

My system is a Dell PowerEdge T140, running Ubuntu 18.04.2. I have a service that depends on the host's primary IP address, and that service fails to start if that address is not configured on the ...
0
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1answer
32 views

QEMU VM has no IP

I tried to run a VM on QEMU, but the VM is up without an IP address associated with eth0. I configured the bridge and tap interface on the host, and I can see that: brctl show bro bridge name ...
0
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2answers
60 views

Network Unreachable For Ethernet Interface Arch Linux

Everything was working fine up until today, I've been fiddling for hours trying to configure ethernet on my arch install with no luck. I run a dual boot system with windows and networking seems to be ...
0
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1answer
45 views

How can I find out which processes are using or listening on which network interfaces?

ifconfig lists several network interfaces, some of which are virtual ones. How can I find out which processes are using or listening on which network interfaces? Thanks. $ ifconfig docker0: flags=...
2
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1answer
85 views

Which network interface or IP address in the guest OS corresponds to which in the host OS?

I heard that a guest OS and a host OS in KVM can communicate via having network interfaces or IP addresses in the same private network. I also heard that You can see its IP addresses and network ...
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1answer
34 views

Does `lo` have no MAC address?

From https://networkengineering.stackexchange.com/questions/57935/is-a-network-interface-supposed-to-have-no-more-than-one-mac-address/57937?noredirect=1#comment100988_57937 A network interface in ...
0
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1answer
19 views

Bridge Configs Reset After systemctl restart network

I currently have a Centos 7 KVM host with the following network config: [root@workhorse1 log]# ip add 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 ...
0
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1answer
19 views

Can i configure the browser to use one network interface and other apps to use the second?

I have a Linux box (Debian 9) with 2 NICs (Ethernet & Wifi) and they both connect to different networks. Is it possible to configure the browser to use the Wifi NIC and all the rest of apps to use ...
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0answers
72 views

When does an IP address not need to be assigned to a network interface?

ping 127.0.0.2 can receives response. $ ping 127.0.0.2 PING 127.0.0.2 (127.0.0.2) 56(84) bytes of data. 64 bytes from 127.0.0.2: icmp_seq=1 ttl=64 time=0.068 ms 64 bytes from 127.0.0.2: icmp_seq=2 ...
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0answers
45 views

In what cases, can ping receive response when the IP address is not assigned to a network interface?

Is ping supposed to test if an IP address has been assigned to a network interface and if the network interface is reacheable? Stephen replies at Why is some virtual network interface assigned ...
0
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1answer
36 views

Alfa AWUS036NH with no IPv4 Address on ifconfig [closed]

I have bought an Alfa AWUS036NH and I think I have set it up properly but when I type ifconfig I don't get an IPv4 address. Output: eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ...
2
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2answers
100 views

why MTU change from 1500 to 9000

in /var/log/message file we found something interesting Mar 9 07:08:32 linux54 kernel: ixgbe 0000:0b:00.1 en3j87: changing MTU from 1500 to 9000 we can see the interface card - en3j87 change from ...
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0answers
24 views

services on host no longer reacheable from outside, after adding bridge

before adding the bridge, different http services were reachable from other hosts. After adding the bridge, only ssh is reachable from other hosts. All other services are only reachable from the host ...
2
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1answer
38 views

How to add second IPv4 Public IP to amazon Linux EC2 instance

I have EC2 instance (Linux OS) and I added second network interface to it. I got public Elastic IP and assigned to the network interface. Then I assigned network interface to the EC2 Instance. When I ...
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1answer
68 views

802.11ac : Trying to obtain 1.7333 Gbps 160MHz

I am trying to obtain maximum throughput between two Ubuntu nodes; both with the 160MHz capable Intel Wireless-Ac 9260 card using an ASUS GT-AX11000 router. Ubuntu1--2meters--AX11000--10meters--...
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1answer
30 views

What can I do to enable automatic switching to a backup network when there is packet loss?

If I create a connection using network bonding (using the mode active-backup), then although automatic switching to the backup network occurs if I pull out the network cable, it does not occur when ...
0
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1answer
46 views

Can you assign different DNS servers to different network interfaces?

I am trying to have my eth1 use 10.50.1.11 and 10.50.1.12 dns servers whilst my eth0 interface uses 8.8.8.8 and 8.8.4.4 dns servers. I am running centos 7 vms within xenserver 6.5. eth1 is a closed-...
2
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0answers
50 views

Linux - Failure to assign ipv6 address to virtual interface without error

I'm working on NixOS, creating some functions in C to programmatically manipulate veth pairs and assign IPv6 addresses in order to create a program for setting up a network for containers on a single ...
1
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1answer
28 views

How to control which network is used for different things on Ubuntu? [duplicate]

System: Ubuntu 18.10 I have a linux Desktop running that is connected to two different networks: WLAN adapter connects to the wifi network for: internet access connect to vpn with openconnect LAN ...
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1answer
84 views

In Mint 19.1, how do I bond an ethernet and a wifi adapter?

In Mint 19.1, I can see in "Network Connections" that I can bond 2 ethernet adapters. How do I bond an ethernet adapter and a wifi one without completely disabling the GUI configuration of networks? ...
0
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1answer
55 views

Static file to map IP to MAC addresses

I created a mesh network. Sometimes the ARP, IPv4 based applications, or even ping do not correctly respond, any suggestion? Actually, I require to create a file (i.e whatever) that contains IP -> ...
0
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0answers
53 views

Ubuntu 18.04 server dhcp issues on VirtualBox 6.0.4 with bridged adapter

I'm having issues with dhcp on virtualbox 6.0.4 with an ubuntu 18.04 server guest -- when using a bridged adapter, it hangs on startup while configuring network settings, and dhclient just fails ...
0
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1answer
102 views

Debian 9: Multiple Failures During Startup

Recently I was using my notebook in a normal session when, suddenly, the network interface stopped working. I manually shut down the system (couldn't do it via LXDE neither via terminal) expecting ...
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0answers
47 views

Udev - Network cable hotplug event not catched

I'm running a buildroot custom linux (kernel 4.9.87) on a custom board based on an Atmel Sama5d2. I'm trying to configure the network on the eth0 interface using dhcp only at hotplug. Originally, ...
4
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1answer
72 views

Devuan… Reduce time to wait while internet interfaces being configured during boot

I am using devuan linux for my laptop after leaving debian back due to the first's better sequrity and its simplicity compared to debian. I am really happy with it but I have the next problem: When ...
2
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1answer
408 views

No wifi adapter found [dell precision 5530 & ubuntu]

On my laptop I have trouble with wireless networking since I installed linux. Sometimes when I start the laptop (1 of 3 times) my wireless card doesn't work. Wifi option is missing when I click on ...
0
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1answer
21 views

Retrieve both eth* and “long” names (manufacturer) for every network interface?

I'm on Ubuntu 18.04. Following the examples on https://www.cyberciti.biz/faq/linux-list-network-cards-command/, I can use # lspci | egrep -i --color 'network|ethernet' to get manufacturer names of ...
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1answer
30 views

Web Server access via second interface

I’m trying to access a Web Service (port 8080) on my Raspberry Pi via both of the following interfaces (which have static IPs): Ethernet (eth0, 172.22.0.99, connected to a Netgear router). Wi-Fi (...
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0answers
61 views

Debian Stretch - how to run 2 network adapters simultaneously

How can I run 2 network adapters in Debian simultaneously? I have a common NIC and the second adapter USB->LAN adapter and I need to run them both but when I turn on USB LAN adapter then NIC ...
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2answers
64 views

Disable Internet Access on Eth0

I have a Raspberry with eth0 (192.168.02 / static) connected to a router (Fritz Box @ 192.168.0.1). The Router has internet connection. The Raspberry has a mobile usb stick with ppp connect to the ...
0
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1answer
25 views

Centos 6.7 in a laptop does not detect network interfaces but detect network hardware

I am installing CentOS 6.7 in my laptop, I have Windows 10, Centos 6.7 and Ubuntu 18 installed, but CentOS is the only OS that is not detecting any network interface, wired neither wifi. I used ...
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0answers
13 views

How do I configure the network from command line in CentOS 7

Is there a command that will configure the network in CentOS7 persistently (survives reboot) ? I want to write a script to do this and I'd rather avoid echo'ing output to a config file. Can this be ...
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0answers
36 views

Tapdev open function returns me 37 value

I am trying to create a tun device and tap interface. But the open function returns 37 value. why? fd = open("/tmp/tun", O_RDWR) https://github.com/contiki-os/contiki NOTE: It works well in my pc ...
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0answers
32 views

Pernament tunnel at every boot in CentOs 7

I want to have my tunnel UP at every system restart. It is my non persistent solution: ip tunnel add vti0 local 222.222.22.222 remote 33.333.333.333 mode vti key 41 ip link set vti0 up ip addr add ...
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1answer
111 views

How does iptable work with linux bridge?

Setup: VM1 --- Bridge -- VM2 VM1 and 2 are on same subnet. Bridge has 2 interfaces added to brctl bridge. When I block VM2 ip using uptables -A FORWARD -s (VM1 ip) -j DENY it doesn't work. I ...
0
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1answer
161 views

How to read data from tap interface?

I have a problem with network bridges and tun/tap devices. Actually, the main problem is that I am trying to create a network bridge and a tap interface before compile time. And in compile time my ...
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0answers
18 views

How do I access the network from the terminal in a Tails OS booted from USB with persistent storage and a WiFi connection?

I am trying to configure a usable coding environment on a tails-os usb boot stick with persistent storage. I've installed netbeans and composer, but I am unable to add plugins to netbeans, and I am ...
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0answers
49 views

Add interface that is up to a bridge

I'm trying to compose /etc/network/interfaces that would combine two ethernet interfaces in a brdige. The problem is that the system boots using PXE loader and NFS root, and one of the interfaces ...
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vote
1answer
29 views

Hosting a simple honeypot server in each of 3 VLANs using one ethernet port

I am trying to set up a honeypot server in different VLANs. The company I work in has 3 VLANS: 10, 20, 30. My goal is to use a Raspberry Pi to host a simple honeypot and broadcast sniffer (for ARP and ...
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0answers
40 views

Impossible to set the default gateway address on boot-up

I am using a BeagleBone embedded computer running Debian. I have two network interfaces : 1) A connection to a cellular modem over USB which uses ppp and connects to the outside world. It receives a ...
0
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1answer
68 views

resolv.conf always empty

I have 2 different embedded devices...an old one running TI arago Linux and a Xilinx device (petalinux). On both I see the same outcome when adding dns-nameservers to /etc/network/interfaces and ...
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0answers
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Linux set ip address with echo [closed]

Is there any way to set IP address on network interfaces, with echo to file /sys or /proc? I have also this question about set routing and firewall . Actually I am Java developer and I won't ...