Questions tagged [networking]

Managing and using network connectivity on a unix system

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20 views

I leave my raspberry with VPN connection on, and after several hours, I connect to it but has no internet connection. How to troubleshoot/diagnose?

I connect my raspberry to VPN, and I leave it there for hours. When I check it connecting through SSH or VNC, I realize that it has not internet connection. If I reboot and then connect to VPN again ...
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How to connect Ubuntu to AirPlay speakers placed in another network?

I have Ubuntu 21.10 with ip 192.168.0.1 connected to a router having a static ip WAN=192.168.0.2 and Gateway=192.168.0.1; basically my Ubuntu is the Gateway. The router's LAN address is 192.168.1.1. ...
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Adding a VLAN-transparent bridge to Linux (Debian)

On my current Debian system I use VLAN tagging and I create bridges br-wan and br-lan that I use for LXC containers: auto lo br-lan br-wan iface lo inet loopback iface br-wan inet manual     ...
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2answers
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No internet access on Arch fresh install

I just freshly installed Arch on an ROG Asus laptop and successfully got everything setup. I was able to connect to the internet even after rebooting out of the live environment. I installed a few ...
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FortiClient headless cli - how to install and configure to handle certain IP ranges only or permit SSH

I am trying to configure the headless VPN only FortiClient on an AWS ubuntu 20.04 ec2 instance, and though I am able to connect to the target, I am then disconnected from the instance and cannot ...
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1answer
50 views

Stop Application from listening to a particular port

Background We would like to configure a Linux machine so that it doesn't automatically listen to a port; whether a default port or not. We are using Oracle Linux and RHEL. Issue How can we prevent our ...
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dockerd failed to start daemon: list bridge addresses failed

Exacactly the same issue as Failed to start Docker Container Engine, as I'm getting dockerd failed to start daemon: Error initializing network controller: list bridge addresses failed: ...
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Networking suddenly stopped on Guest (Debian) and some on the Host (XUBUNTU) - using VirtualBox

Hope someone can help me, please. I have an odd one here. I run a Debian OS with 3CX IPPBX as a virtual machine (Guest) using VirtualBox. It is running version 9 and the 3CX needs an upgrade that is ...
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26 views

How to get ifstat outputs in python?

Trying to get the values from ifstat -i wlx88366cfd0226 command in a Python script. I have tried this but not getting its output. The full code is: import subprocess import time import argparse ...
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LACP bond seen as down (1 device) while networkManager sees both interfaces as connected

I have a server configured with LACP (through networdManager). The bond connection appears as up: # nmcli connection NAME UUID TYPE DEVICE bond0 ...
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2answers
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How to calculate the size of data transferred between two machines Ubuntu?

I have two computers. The first one is as a workstation. It runs the deep learning code and connects an AP by a wired connection. The second one is as a robot's computer. It sends the video and other ...
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My vpn is connected but i cannot browse internet

i have problem with vpn recently i can connect with vpn but not with internet, ping shows up to 200ms more. mtr -rw api.protonvpn.ch Start: 2021-11-20T16:49:27+0700 HOST: nonely ...
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ping Minimum Interval?

No, not the 0.2s available to unprivileged users. What is the minimum interval that ping (from iputils s20190709) supports? I asked it to : ping -s 18 -W 2 -w 300 -qOni 0.000024 ... but it seems to ...
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bpf filter - how to filter out unnecessary?

How to implement whitelist by ip addresses in bpf? situation: there is a mirror, network interface, traffic monitoring brings garbage traffic, you need to implement a whitelist for my IP addresses so ...
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ufw allowing all connections even though rule doesn't allow it

I just setup ufw on my Pi and allowed only sudo ufw allow <my_selected_ipv6>. I also setup sudo ufw default allow outgoing and sudo ufw default deny incoming. Additionally, I limited http and ...
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Custom nameservers not resolving on Debian 11 on Hetzner root server

I am at my wits end. I've spent the last two days trying to set custom nameservers on a Debian 11 Bullseye installation. Debian is installed through Hetzner's installimage script. Now, the recursive ...
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How to Track total internet / data usage of a specific app or a process for Linux (headless)

I would like to check the total use of the Internet for a process or application or a bash script (to set up a quota for my application). I tried some applications and found it just giving download ...
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1answer
25 views

Samba share shows wrong disk free space

I have a virtual machine that I use for a samba share at home. It stores the data on a shared folder from the host machine. Both on the host and guest machines, the total and available space for this ...
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1answer
17 views

Ufw allow app: ERROR: Need 'from' or 'to' with 'app'

I am using Ubuntu 20.04.3 LTS, although this question is probably not specific to Ubuntu but to any system using ufw. I am setting up a rule for VNC vino connections. I meant to do that via a ...
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USB Wifi Device state unavailable with cabled network connected

First off, im a Linux n00b. I have read numerous posts about this but each seem different and none are working for me. I am using a Pandas N600 USB WiFi device for wifi on the Ubuntu20 machine and an ...
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1answer
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Measure traffic for an interface monthly

I am running a small RPi server in a remote home and I have a simcard with very limited data usage. I would like to have a file that measures cumulatively month by month (starting, for example, from ...
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Network Manager is having trouble at making wlan get 'up'. I have no Idea

I have not been able to use a wireless network connection for month. I'm in Endeavour OS Every time my Wi-Fi doesn't work I use the command: networkctl status which says multiple things at different ...
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ARP: are probe packets to 0.0.0.0 target legal?

I have a LAN segment of 'dummy' devices connected via L2 switch to a 'smart' gateway. The port they are connected to is a trunk port. The devices don't know the VLAN ID, and thus needs to discover it ...
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WLAN RF Testing, continuous transmitting at maximum power

Is there a tool to put Wifi on a continuous transmitting mode at maximum Power? Something like for SAR measuring purpose. I need that for my RF energy harvesting research. with iwconfig wlp1s0 txpower ...
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WiFi problem on Pop OS unusable after few minutes

Changed wifi dongle: Hello I have problem with my wifi on a PC. Previously I was using the AC600 nano WiFi card but connection seems to be unstable, so I decided to buy the TL-WN722N, but the problem ...
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Does tc (traffic control) enqueue packets or frames?

Assume we are working with TCP/IP connection. According to https://wiki.linuxfoundation.org/networking/kernel_flow tc works on Layer 2. However, everywhere else in the internet (man, lartc, ..) the ...
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Reach a subnet using a specific network device

My setup is the following: Local network 192.168.1.1/16: FritzBox 7530 as Router/Modem 192.168.1.100/16: my dev machine (Ubuntu 20.04) The FritzBox creates a VPN tunnel to connect a remote machine ...
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1answer
65 views

Why is net-tools deprecated ? Can I still use it without security issue?

I learn Linux and networking more than 10 years ago. And now that I need to configure network again for my job, I find out that most of the command lines tools I used to know do not work anymore / are ...
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Is it possible to send ARP request from another NIC

Suppose I have two NIC on server1 and two NIC on server2: NIC0 of server1 connected to NIC0 of server2; NIC1 of server2 connected to NIC1 of server2. NIC1 doesn't support ARP protocol(some specific ...
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Extremely slow booting time in Linux Lite since yesterday (Over 5 minutes), what should I do?

Here are the details: systemd-analyze Startup finished in 6.345s (kernel) + 5min 17.341s (userspace) = 5min23.687s graphical.target reached after 5min 17.322s in userspace here's what I get with: ...
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1answer
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What constraints (if any) are there on network interface names on linux

In https://stackoverflow.com/questions/24932172/what-length-can-a-network-interface-name-have, it was asked how long a network interface name could be (apparently 16 bytes). However, the answers to ...
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Scanning visible wifi networks with iwlib

I am writing a prgram in C++ for Linux that connects to wifi networks. Once connected, the program periodically scans the networks to see if the network it is connected to is still visible. The ...
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How to configure virtual service to be available on the network (ipvsadm)?

This is trivial yet I can't figure out question I need to ask to find a solution on the internet. Using ipvsadm I've set virtual service: root@ruter:/home/debian# ipvsadm -S -A -t 207.175.44.110:http -...
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1answer
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How to make a Machine-In-The-Middle with a dual NIC PC in Linux?

I would like to use a Linux PC fitted with two network interface cards as a transparent bridge in order to capture (with wireshark or equivalent) all the traffic in both directions between my router/...
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1answer
30 views

How to block the internet access but allow local host connection in a process

I have a python program with 2 process running in docker: my own server listening at 8080 an application listening at 8000 I am trying to block the internet access for the 2nd process. I was able to ...
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1answer
35 views

Does UFW reset iptables on reboot?

I connected to my remote Linux server to adjust my network settings, but I accidentally changed some rules using iptables instead of my preferred method, ufw. I added the rules in ufw and then ran ...
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DSLite AFTR Implementation on Ubuntu

I want to test my DSLite implementation. I made a setup As my ubuntu machine is sourcing me a global Ipv6 address(dibbler). Using that i have enabled the dslite tunnel with my AFTR(Ubuntu machine). ...
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2answers
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How can I purge and remove all network capabilities from Linux Mint?

I have a fresh install of Linux Mint and the necessary software which I like to use. I was now wondering how can I purge and remove all internet capabilities from my system, WiFi, Ethernet, Bluetooth -...
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Can't ping ubuntu server after completely booted

So I have turned my old notebook to a home server. Connected to the network by wifi. I have accomplished that the server connects automaticly to the router and it can access the web. The connections ...
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0answers
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Atheros AR9382 wireless lab testing tool

My system is running Ubuntu 14.04 on it and the device is going for lab testing. One of the test cases are to put the wireless module in certain conditions such as Change their modulation type, change ...
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netplan not configuring network

I'm trying to configure a static IP on a freshly installed, fleshly upgraded Ubuntu 20.04.03 system. This is my /etc/netplan/00-installer-config.yaml: network: ethernets: enp4s0: dhcp4: ...
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1answer
18 views

WiFi interface configured as AP is down after system restart

I'm trying to setup my WiFi interface in AP mode using hostapd. However, after system restart startup hangs for about 2min on: A start job is running for Wait for Network to be Configured It seems ...
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22 views

Unstable WiFi Connection/Ping in Manjaro

I have this issue to where my ping will be very unstable, this has been an ongoing problem for quite a while now, and I'm not sure if it is a hardware or software problem, because I had this issue ...
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26 views

Is there anything one can do if traceroute shows issues along the path?

Since few days I cannot reach anymore a site: assist.zoho.com (or assist.zoho.eu). Here the output of traceroute: $ traceroute -I assist.zoho.com traceroute to assist.zoho.com (136.143.191.95), 30 ...
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Cannot get the full throughput from the specified TCP pacing rate

I am writing a TCP kernel module that needs pacing. Based on TCP BBR, in the kernel module, I first set the pacing status in my init function: cmpxchg(&sk->sk_pacing_status, SK_PACING_NONE, ...
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21 views

IPTables - 2 Nics - Private - Public - Private route

I have a CentOS 7 with 2 NICs (enp1s0 - private LAN 192.168.0.0/24 and enp0s29u1u1 - public) that I use as a gateway / router via iptables. All PCs on the private LAN connect to the internet via the ...
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32 views

What are ways to block a certain user IP address when their data is received from a load balancer and encapsulated in Proxy Protocol V2?

I have a couple of web servers behind an Amazon ELB Network Load Balancer. The load balancer replaces the source IP address of a client packet with it's own source IP address. In example, a client ...
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20 views

Except creating a network bridge on the host, is there any other way to SSH from host to guest in QEMU?

I have installed a QEMU VM, both host and guest OS being ubuntu 20.04. For the host to SSH into guest, do I have to use bridged networking? Is there any other way to SSH from host to guest in QEMU ...
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18 views

Viewing Pictures via SMB much slower than copying the picutre

I have an NAS in my local network that I connect to via SMB from my laptop. When I try to view a single picture that is stored on my NAS via feh or nomacs, it takes 30s sometimes longer. Copying over ...
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How to setup QCA9377 802.11ac Wireless Network Adapter with Kali?

I'm trying to setup wifi on kali linux. I tried to clone the ath10k firmware repo from GitHub inside /lib/firmware but this is not working. Here I'm pasting my lshw -C network output for wireless ...

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