Questions tagged [networking]

Managing and using network connectivity on a unix system

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NetworkManager dispatcher `up` and `pre-up` states and DNS resolution for wifi

I have a script I made with Perl WWW::Mechanize that quite nicely keeps me logged in, or actually logs me into, a captive portal. It does so by looking up (via Net::DNS) and then "pinging" (...
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autofs shall mount depending on network/address

when I use my notebook not in my office network, the auto mounter should not try to mount my /etc/auto.share entries. Is there a setting avoiding the mount depending on the network/address? The big ...
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Adding persistent routes to Debian 10 without restarting

I am trying to add a static persistent route on a Debian 10 machine without needing to restart it. My /etc/network/interfaces looks like this: # This file describes the network interfaces available on ...
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Creating a virtual wifi network interface for a second hostapd access point

I'm trying to set up hostapd with two SSIDs. One I can do; a second is proving impossible. My latest hypothesis is that one first has to create another of them things what appear in ip a, then add it ...
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Why would a network interface be detected by nmcli and ip, but not by iw?

Running ip link I get the output 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:...
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Ephemeral network interfaces

I'm on Ubuntu 20.04 and each other time when I access a web page, Chrome says "Your connection was interrupted ERR_NETWORK_CHANGED". Running watch -n.1 ifconfig shows my cable, wireless and ...
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Destination host unreachable (ICMP), although a simple ping can reach the same host

I've setup some application using port 179 (BGP) on two CentOS hosts which are directly connected to each other, but they seem to be unable to establish a connection, so I launched tcpdump to check ...
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WIfi Keeps Disconnecting on my Fedora 32

My PC connect to the wifi and i get hotspot portal, something information is written in title of pop out window and then it blanks out, which is not how it has been in the last 2months I've been using ...
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Gnome wireless issue with a working network [duplicate]

Just installed Debian 10 with unfree additions. Initially, it started up to console without networking, so I followed steps in https://wiki.debian.org/WiFi/HowToUse#Command_Line to get my wireless to ...
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How would I manually set an interfaces type in networkmanager?

At the moment I have been playing around with some VMs and networking recently (just for the learning experiance), at the moment I have an interface on the host called "veth0" connected to ...
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Forward traffic port to specific network interface using iptables

I have total of 10 apps using different ports (5121-5131) and 5 network interfaces (lets call them eth0 - eth4). I need to route all traffic through the eth0 interface (metric should do the trick) ...
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Share Connection With Bridged Interface Debian To Windows

I have a Debian and Windows 10 VM on a Hyper-V host. The Debian VM gets its connection from the Hyper-V host and bridges the connection to a second network interface so the Windows 10 VM can route its ...
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Use NetworkManager to share wifi and ethernet at the same time

At the moment, I connect my PC via wifi to the internet and share it with other computers via an ethernet connection. So my question is, if it is possible to simultaneously share my internet ...
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Docker-compose v3.5 with pre-excisting network and static IP not working

I am stuck with an docker-compose issue that I can not figure out. I am trying to use a compose file with a pre-excisting network and a static ip, but I keep getting the message that the network does ...
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Linux command to find which port a process is running?

Is there a clean way to check on which port a linux process/service is running/listening to? I know fuser, netcat, lsof, etc all are ways to find that, but they return a bunch of other information ...
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No WiFi adaptor found + Cable Unplugged Ubuntu 18.04

I have installed Ubuntu 18.04 LTS on my notebook along with Windows (which came pre-installed). However, I cannot connect to wi-fi because there is a "No Wi-Fi Adapter Found" message. I ...
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Limit bandwidth for outgoing/incoming with latency for specific port using TC

I'm trying to limit the incoming and outgoing bandwidth with latency through a specific port using TC but I can't get it to work 100%. I'm not sure if I've done it correctly. When I ping google, the ...
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How to route 2 interfaces to the same destination IP address

I have a RPi with two different interfaces (wwan0, wwan1) each one with one IP provided by two different wireless network operators. The RPi has to communicate with a server for the correct ...
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Cannot cUrl self with public IP

My home network has a CentOS based server connected to it. I have a router, where the 80 and 443 ports are forwarded to that server. I can reach this server with the public IP of the router and ...
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How to set up raspberry Pi as gateway server?

I have pretty simple home network with cable modem/router(single device). I also have raspberry Pi on the network with AdGuard DNS server setup, it is running Raspbian GNU/Linux 10 (buster) . Router ...
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How to configure NGINX to Redirect Traffic to Different Ports if Interface has Multiple IP Addresses

An Ubuntu 20.04 machine with a single network interface is given 3 IP addresses. We want to run several instances of a program that listens to a specific port and have one instance listening to each ...
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Link State Pass-thru on eth0 and eth1 while bridging

Is there a way to control link state of an adjacent network adapter while configured as a bridge? I'm using Debian 10 with interfaces file and creating br0 from enp1s0 and enp2s0. I'd like to be able ...
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1answer
38 views

Ethernet interface name not consistent

I am seeing this peculiar behavior after boot, i see the interfaces as enp2s0, enp1s0 and when i remove the module and load it again, i see eth0, eth1. I need to get back enp2s0, enp1s0 as my scripts ...
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Join MINT 20 System to Windows Server 2003 AD fails with "failed to lookup DC: Device Timeout

I've been following the instructions provided in https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Domain_Member to try and get a Mint Linux 20 machine added to my Windows Server 2003 domain. At ...
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How do I start a Docker container in other _host_ network namespace?

docker run --network=host starts a container in the same network namespace as containerd. How do I instead start a container in, for example, /proc/5633/ns/net or other specific network namespace? man ...
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Setting TCP MSS on a bridge port

I have a VXLAN tunnel between two Linux hosts. This tunnel is carried over an Ethernet link with an MTU of 1500 bytes. At each end, the VXLAN interface is slaved to a bridge, along with another ...
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mtr interpretation for network/hardware performance

Sorry for being so elaborate on this one. Few days ago noticed this problem, my work VPN kept disconnecting frequently on my OFC broadband connection. It became so bad that I had to revert to 3G ...
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OpenVPN -> KVM guest not working

I am trying to configure openvpn and shorewall to be able to connect to virtual machines without SSH tunnels. VMs are KVM with with default NAT networking. VPN Client -> VM HOST -> VM GUESTS (22,...
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tunneling vnc through jump host stopped working

I have a setup where VNC from my office is tunneld throuh a jump host so that I can pick it up from any of my home systems. This worked fine but for some reason, it doesn't anymore and I can't seem to ...
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Can't connect to the Internet from jail on XigmaNas inside Hyper-V

I installed XigmaNas 12.1.0.4 inside Hyper-V virtual machine. XigmaNas has access to the Internet. But from jail AeMcSiteJail I can't connect to the internet. I can connect other jails and XigmaNas, ...
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Arch Linux can't set wlo1 to “UP”

I recently installed Arch Linux on my Asus X403F VivoBook laptop, through an ethernet connection. But now, I want to connect it to a wireless connection. When I started network manager, via nmtui , it ...
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eth0 not showing ip address

I have set up my network to bridge adapter But whenever I type ifconfig I'm not able to get ip under eth0. Also I can't access firefox when its set to bridge adapter. Please help because I'm stuck ...
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PDNS stranger error with master-slave setup [closed]

I have installed fresh PowerDNS version pdns-4.3.1-1 on centOS8 and setup master-slave for replication. when i added new zone on master i got following error on slave server logs Oct 16 14:01:23 pdns-...
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Network crashing upon plugging charger to laptop

Upon plugging my Manjaro laptop to electricity, Wi-fi won't stream any data - just a tiny minimum, some bits per second. Connection is established with the Router (this takes much longer than usual) ...
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Wrong time after reboot pop_os

I'm currently working on a dual system pc windows(legacy) and Pop_!Os(UFEI). recently, I've been facing a time problem which on windows is not present but whenever I reboot the device the Linux time ...
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2answers
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Transparently bridge network over serial link

I have two Linux devices - for simplicity let's call them Raspberry Pi's - in a box that I want to connect to a network with a singe Ethernet link. Both of them need to be accessible, individually, on ...
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ARP Response Is Being Ignored

I am having issues trying to set up bi-directional connectivity between a virtual machine and my host computer. I can connect via "console", but I would like to be able to connect to and ...
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1answer
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How to know an IPv6 address is configured stateful/stateless under Linux?

On macOS, I can rely on IN6_IFF_AUTOCONF (SLAAC) and IN6_IFF_DYNAMIC (DHCPv6). https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/netinet6/in6_var.h.auto.html On Windows, I have ...
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Kali can see USB Wifi adaptor but can't run it

I'm trying to run Kali on a VM on my Windows 10 Laptop. I've tried just about every tutorial I could find to get the adaptor working but to no avail. Here's what I've done so far Created a USB filter ...
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Linux: UDP “multiplexer” inside kernel

I have an application with very high performance requirements and the following job: There is incoming UDP traffic on port 1234. The packets have as fast as possible to be sent to hosts H1, H2, ... Hn ...
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Wifi connected to AP but no internet access

Broadcom BR4321 was working with b43 except for being slow and intermittent therefore I switched to wl instead. Configuration updated basically be replacing wlan0 with wls1 but can't connect to ...
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Network Teaming behavior when switch failed

We have 35 servers running RHEL 7.2. uname -r 3.10.0-327.el7.x86_64 All servers are configured as Network Teaming with the following: All servers are connected to two switches. One switch is ...
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1answer
50 views

How to add static route in Linux (comparing to Windows)

On Windows, I just type: C:\Users\WindowsUser>route add 8.8.8.8 mask 255.255.255.255 10.25.10.28 OK! (my ip 10.10.201.15/8) With Linux (its ip 10.10.201.16/8) on eht0 route add -net 8.8.8.8 ...
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Network interface alias disappearing after reboot. Centos 7

I have a VPS with 2 IP addresses. If I restart the VPS the file /etc/sysconfig/network-scripts/ifcfg-eth0 looks like this: DEVICE=eth0 BOOTPROTO=static ONBOOT=yes IPADDR=X.X.X.X NETMASK=255.255.255....
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Why DNS stops resolving under QEMU “user networking” when the host roams to a particular network?

I use GNOME Boxes on a laptop. The guest machines get the Internet connection automatically with default settings whenever the laptop moves between networks (Ethernet, Wi-Fi in different locations, or ...
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42 views

Can't change MAC address: Too many open files in system

Well, this is a old and unsolved problem in various linux communities and deserve it solves. Basically because is a important feature, these days privacy and security is a fundamental skill for ...
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Overriding assigned IP address using DHCP on FreeBSD 12

Is there some way to assign a preferred IP address despite using DHCP? i.e., to use DHCP to find the router and network mask, but assign the IP address manually (ideally with fallback). /etc/rc.conf (...
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Pfsense on Proxmox - buffer I/O error

So I have the following problem. I would like to virtualise my pfsense in Proxmox and I try to do this on my "MSI MAG B550 TOMAHAWK" which has 2 network interfaces. The only problem is that ...
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1answer
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Configuring IPv6 on FreeBSD 12

I have configured my FreeBSD 12 system to use DHCP, but DNS resolution does not appear to be working for IPv6 (e.g., when I run ping6 or traceroute6). /etc/rc.conf (relevant lines) ifconfig_em0="...
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Cannot access internet from within docker

I am having an issue where after some time after a clean (Debian) system install, docker containers that are not running with host network mode refuse to connect to the internet. When this happens, I ...

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