Questions tagged [networking]

Managing and using network connectivity on a unix system

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Connect to Raspberry Pi through ssh from different network

I want to access my raspberry pi through ssh from another network than my home's I set my raspberry to use a static ip and mapped port 23456 to it (with TCP protocol) I then tried ssh -p 23456 ...
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DNS server not working on one computer only

I have a computer and a laptop, both have 127.0.0.53 running as their DNS servers. One computer runs fine with the current DNS server, but the laptop gets a "Temporary failure in domain name ...
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Kali connectivity issues with wlan [duplicate]

After a minute or two Kali losses the connectivity. It is connected to my wifi but no connection to bring back the connection I have to disconnect and reconnect to my wifi. I have tried enableing and ...
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Linux Mint 20.3 Cinnamon BCM43602 Not Connecting To Network

I just installed a clean Linux Mint 20.3. The network controller showed up after installation. Network settings shows available networks but I can't connect to my network, I just get "activation ...
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Is my webcam hacked?

Linux (ubuntu) user here. I have been using Linux for a long time, which makes me comfortable with the command line. So, I am looking for suggestions and tools to help me solve this problem. In case ...
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nmcli: limit number of active connections

Is it possible to set a max number of clients on an ethernet-interface created with nmcli? Example: I would like max 2 devices to get a successful connection, even if I add a network-switch and ...
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Centos7 installation of WireGuard, the client only sends traffic but not receives it

My purpose is simple, A is the server, B is the phone, B can forward all the traffic to A and then use A to access the Internet A has a separate public IP address Here is my server configuration and ...
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Route only forwarded traffic to VPN tunnel

I have Raspberry Pi with active VPN(tun0) connection. Here are my routes Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 192.168.0....
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How to check if the traffic is going through VPN and back?

How can I write an echo statement between a one OpenVPN client and another on the same virtual subnet provided by OpenVPN server in the middle? Like I want to echo a string from client and the other ...
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How to automatically back up Linux server SD cards with the installation bit for bit?

I have a home server running Raspberry Pi OS (Raspberry Pi 4) that has a hard drive attached for backups of my other devices. I want to use that backup server to backup the SD card that has the ...
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Redirecting DNS querries from NAT'd devices and UFW

I'm having a tough time figuring this one out. I have the following network: (Internet)--(firewall) -- (PC1 (Ubuntu 20.04)) -- (PC2 (Fedora, 192.168.0.2)) PC1 has two NICs, (enp4s0) faces the firewall,...
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How to Extract the DBLP collaboration network txt file and load it to the python notebook?

Trying to extract the DBLP collaboration network from txt file and load it to the python notebook ( in order to undirected network describes collaboration between computer science authors, where each ...
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Network Manager is Not Sending Notification When Connecting to VPN Server in MX Linux

I am using MX Linux 21 XFCE pretty much unchanged from stock. I manually create VPN connections in Network Manager using Openvpn. Its been pretty much trouble free for the most part. One day I was ...
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Intermittently Unable to Connect to Host via SSH

I'm trying to connect to an NVIDIA Jetson AGX Orin DevKit (Ubuntu 20.04) over my local network. I believe that I've set up the SSH server correctly because sometimes I'm able to connect to it. However,...
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Problem with docker network and /etc/resolv.conf

First case: I have the following docker-compose file version: '3.4' services: api: image: ${DOCKER_REGISTRY}project.api ports: - "5080:5080" - "5081:5081" ...
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Linux, SFP Modules vs SFP Cage

This maybe a simple question, but I can't seem to find an answer out there for it. When using SFPs on a linux machine, does the device name (e.g eth0) follow the SFP module of the SFP cage? In other ...
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Can't access any repository on ParrotOS

I am running this VM on VMware and have never had this many issues. I have internet access. I have searched through forums for the past two days trying to find any solution but none seem to be working ...
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What's the best way to rsync two directories with git repositories?

I have two machines that I use for work. One is the local machine located at my home, and the other is the remote machine located at my office. I have a "development" folder in which I keep ...
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Background downloading problems

On windows, if you start a download, then put it in the background and do something else with your time in the meanwhile, it will keep on going ok. Since I changed to linux, every type of download (...
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How to properly create virtual device of 2 x eth LACP in RHEL8

The goal is to create a set of tagged VLANs each with own gateway (no default gateway!) over two eth devices under RHEL8. For one Ethernet link it works fine but if you combine 2 eth over LACP in a ...
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SSH or telnet as an unpriviledged user leads to 'socket: Permission denied' error

I'm running a strange 3.0.35 heavily patched kernel on an embedded device (Kobo eReader). Maybe it partly explains this issue.Basically: kobo:/$ ssh root@127.0.0.1 socket: Permission denied ssh: ...
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Porting NetworkManager's system connections to another machine

I would like to transfer the "persistent" connections of NetworkManger to a new machine. They are configured in the files that are found in /etc/NetworkManger/system-connections/. I noticed ...
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libvirt - cant restart network connection to VM, but creating new one works

As the title says.. I have several VMs running and dont know why but occasionally a network connection will break. I've tried restarting the network from the Virt-manager GUI and also by CLI with ...
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IPv6 not establishing connection for iwlwifi

I receive IPv6 from the router, DNS and gateway seems to be correct, other machines in the same network are able to establish connection via IPv6. I tested using a USB adapter and it worked, which ...
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"Connection refused" when I try to send a UDP packet with netcat on an embedded-linux board

I'm trying to send a binary packet to a local process, via netcat (nc), like this: nc -w 1 -u localhost 10000 < my_binary_packet.bin The output is: read(net): Connection refused Anyone know what'...
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Dump tcp traffic out of container on Mac OS

I have a container running and inside there is a switch emulator and a producer that sends packages to this emulator. there are various virtual ethernet interfaces inside the container for the switch. ...
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Can Linux Mint v20.3 send 1080P display output signal over CAT6 cable?

I got an Asus PN51, Ryzen mini-ITX PC running Linux Mint v20.3. It is connected to my living room LG SmartTV HDMI port which allows me to see YT videos without ads. I would now like to have the same ...
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Cannot sync pkgs and refresh pkg databases with 'pacman' under Archlinux

On every Pacman command I get the following error error: failed to synchronize all database (invalid URL for server) How do I change the URL for the server? I was following this guide. https://youtu....
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LAN internet not working on UbuntuDDE

I installed UbuntuDDE on my PC and plugged in the LAN cable. I've tested this cable also on a different computer and it's working perfectly. Unfortunately it won't work on my UbuntuDDE. When I ran the ...
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How can I perform the same traffic shaping on all transmit queues

I'm trying to use the mq qdisc for performance but I need to add other qdiscs below it to shape traffic. It seems natural to me that one would want the same shaping, regardless of queue and it seems ...
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Is there necessarily an in-kernel copy in Linux zero-copy networking?

I see some Linux zero-copy networking example illustrations on the internet like the following ones: The usual IO example: Zero copy IO example: I see it eliminates CPU copies; it also eliminates ...
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Does the correctness of MAC address matter in UDP?

Here is the thing, I used tcpdump and created a UDP-only pcap file from production environment. Then with the tool tcprewrite, I updated the UDP packets dst IP and MAC address as vm2, src IP as vm1 ...
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Host PC fails to access Webmin which is installed on CentOS in VirtualBox

Webmin can be accessed over SSH after forwarding the port. Now I am trying to access Webmin's control panel on my computer outside virtualbox but on the same computer, but it doesn't load. I tried ...
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Network Activity on Mac OSX Monterey not showing all processes

My network activity is showing that I'm downloading huge amounts of data that are not showing up in my activity monitor. Is there a program I can use that actually works? I tried launchctl list but ...
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Trying to use NFS

Finally shut down my Linux Cent OS Server. Set up a new Fedora 36 Plex server. All set up, but ran into a problem. I can’t get the Fedora PC to connect automatically with the file system on my NAS. If ...
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Can't access WSL installation from LAN

I am running Ubuntu 20.04 through WSL2 (Linux version 5.10.16.3-microsoft-standard-WSL2). I am running a react-js application on the WSL installation, and I am able to view the webpage from Windows ...
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Port forwarding while preserving original IP

Im using firewalld to forward an incoming port from the internet (9999) to a local LAN IP address (100.1.1.1) like this: external (active) target: default icmp-block-inversion: no interfaces: ...
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Rasberry pi 4 Ethernet stops working when connected to WiFi Network

I have tried to connect my Rpi4 to the internet via Wi-fi and simultaneously to my PC via ethernet. I need the ethernet to my PC only for a wired local connection for quick ssh and VNC. I don't want ...
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WireGuard Lan access does not work on Linux but on Mobile phone

I'm trying to connect my Laptop (which is running fedora or manjaro) to connect all the time to my raspberry Pi with PiVPN. I have set up the IP tables and also port forwarding. I can access my Pi ...
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How to configure proxychains the right way?

I configured proxychains following a couple tutorials on the web which were pretty much all the same, as they showed the configuration using Tor service. The problem I'm having is that my DNS is being ...
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Blocking UDP port 140 from receiving packets from source port 8989 (active way to send signal to sender that is unreachable)

So my problem is that I want to block UPD port 140 from receiving packets from port 8989, but I want to block it actively, not just silently ignore it, but to send an active signal to the sender of ...
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OpenVPN IPv6 ping outside and inside network but can't surf web

I have an OpenVPN server configured to use IPv4 and IPv6. IPv4 it's all OK - I can ping and surf internet. IPv6 can ping only. I have a /48 assign to me by Hurricane tunnel broker and configured to ...
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ssh forwarding via jump server

Full disclaimer: I come from the data world and I have limited experience with Unix and Network. I have Mysql running on Linux 5.15.36 (say server A), and I have configured a jump server running ...
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Method to diagnose what my network Rx bytes are?

I'm working on an embedded Linux product (Debian 10.8 running on Atmel based SBC). When in its "normal rest state", it should be doing very little network traffic, NTP and one minute MQTT ...
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What is IFA_UNSPEC payload in netlink response to RTM_GETADDR?

I wrote a program to query the Linux rtnetlink(7) interface using RTM_GETADDR for family AF_INET. Parsing the response I realized that the biggest parts of the response seem to be IFA_UNSPEC type ...
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Weird Ipsec behavior

I am running into something interesting which I am not able to explain well. I brought up a simple Ubuntu 20.04 box and attempting to protect all traffic via an IPSec tunnel. I am not using VTI or ...
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NetworkManager won't start after upgrades

I'm having trouble getting NetworkManager to start after upgrading. I initially tried running: sudo service network-manager restart to see if that would kick it again, but I get the following error: ...
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Has 10 Gbps through Linux tc qdiscs ever been solved?

I'm trying to use tc to shape traffic on a system with 10 Gbps NICs and I find that I can't get anywhere near 10 Gbps through any qdisc. When I do: tc qdisc add dev $ifc root handle 1: htb default ...
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fstab mount is delayed

I just installed the newest version of Manjaro ARM on an sd-card for my Raspberry Pi 4. Now I am trying to mount two directories located on my Synology NAS permantly (via network of course) using the ...
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Change the default firewalld zone for podman networks

Whenever podman creates a new network (interface) - by default - it adds it to the trusted zone of firewalld as described here: Podman adds each container to firewalld's trusted zone. You can add ...
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