Questions tagged [networking]
Managing and using network connectivity on a unix system
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Installing TP-Link AC1200 T5E PCIe Adapter on Pop!_OS [closed]
I'm having the same issues as on the discussion: on Debian 11
Where my TP-Link AC1200 PCle adapter is running at very slow internet speed below 10Mbps and cannot figure how to download the drivers for....
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Cannot reach internet from wireguard connection in networking namespace
I am following this blog post to experiment with wireguard and networking namespaces on my machine running the Linux Kernel version 5.15.32:
https://www.ismailzai.com/blog/creating-wireguard-jails-...
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OpenMPI built from source not working on a raspberry pi + mac cluster
I am trying to use macbook m1 as the master in a cluster of 4 raspberry pies (workers, connected to each other with a switch which is connected to my home router to which the mac is connected via wifi)...
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How to do trick ISP (Free Radius) into thinking you're on a different OS
Here is the issue: Linux is blocked on my school network. the school IT team set it up that you need a username and password to get acess on a connection based level(meaning that it needs a username ...
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UNIX SVR4.2 > How do I find the IP address on a Virtualbox system?
I have installed a VirtualBox VM of UNIX System V Release 4.2 and have discovered just how barren the internet is on documentation of it. Only a few modern commands exist, although obviously because ...
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Limit outgoing traffic per month
I am looking at a virtual server tariff that has limited outgoing traffic for a month, with billing if the traffic is exceeded.
I would like to track the outgoing traffic automatically somehow, so ...
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Name Server Daemon (NSD), possible to use PostgresQL/MARIADB as backend for DNS zone data?
Is it possible to store DNS zone data in a database with NSD? I have not found any documentation for that.
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Unclear delays pinging over IPsec VPN
What could be the cause if every second ping is delayed for a second when pinging through the host-to-network VPN while at the same time pinging the security gateway outside the VPN takes 13 ms on ...
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SO_TIMESTAMPING: Which timestamp is used if we read multiple packets at once?
Given Linux is used and packet timestamping is enabled with SO_TIMESTAMPING for a TCP socket and we read now some data, what timestamp will be reported if the byte-stream which we read was merged out ...
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Why is my virtual network interface preventing Internet after reboot?
I have a set up a virtual network interface on enp1s0 with label enp1s0:0. I use enp1s0 for Internet with occasional VPN connection. I use the virtual network interface IP so I can SSH into the ...
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Linux: Getting the kernel buffer size for a socket
I have a C application which receives a lot of data over a TCP socket. Is it somehow possible to get the kernel buffer size for that file descriptor / socket? I would like to know how much data is ...
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Question on encrypted DNS over Quic? How is it encrypted?
Suppose,I am using DNS over Quic. Since it is an encrypted protocol as it claims. My question is if intermediate servers cannot see my dns query, how will my dns query be resolved?
It says that the ...
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unable to scan WiFi SSID
I have successfully integrated the "SD-WLAN-SD-BT-8997-U16-MMC-W16.68.10.p162-16.26.10.p162-C4X16693_V4-MGPL" driver into Android 12 Linux 4.9.178 on our custom BG5CT-based platform. With ...
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CentOS Stream 9 image has predictable interface naming disabled
I'm using a qcow2 image from here.
Note the net.ifnames=0
cat /proc/cmdline
BOOT_IMAGE=(hd0,msdos1)/boot/vmlinuz-5.14.0-366.el9.x86_64 root=UUID=<uuid> ro console=ttyS0,115200n8 no_timer_check ...
mockitodorito
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No internet connection on Debian 12
I installed Debian two days ago. While installing the network was fine, everything was correct. On the first boot however, I got greeted with errors like "IP configuration was unavailable", &...
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2
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How to stop automatic network provisioning
I recently installed RHEL 9 and attempted to delete all network interfaces. I removed all files in /etc/sysconfig/network-scripts folder and deleted the interface ens192 with nmutl. However, after a ...
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Route bridge traffic thru a specific interface in my KVM server
My setup is as depicted in the image.
My VMs sit on both virtual subnets. Currently, all traffic from both virtual subnets flows thru ens1 since that is the primary interface with a route metric of ...
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1
answer
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Can I disable congestion Control in QUIC in linux?
I want to know if I can somehow disable congestion control in QUIC.
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22
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lsof doesnt seem to be showing all connections
I am on the latest MacOS
nettop shows connections from browsers and other processes.
However lsof -n -itcp doesnt show any connections. Is there a way to debug this?
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Disable Network Permission for all Flatpaks
The Flatseal Flatpak has a toggle to disable network permissions (share=network) for all Flatpaks installed on your system. How can I do this same thing by command line, for all Flatpaks installed on ...
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Why is balance-alb considered an invalid mode for high availability in a multi-switch topology?
In the Linux Ethernet Bonding Driver HOWTO, section 11.2 describes a multi-switch topology for high availability, including a nice ASCII art diagram of such a setup that involves two switches with an ...
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1
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How to Make a Systemd Private Network Namespace Accessable
So I have an application that only binds to 0.0.0.0 and listens on a port (TCP).
The communication is unencrypted and unauthorized so I'd like to work around that without getting too deep into the ...
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1
answer
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Change Vendor Name returned from IP scanning apps
I have a custom embedded device that returns a Chinese vendor name when IP apps scan the network (and I mean that actual Vendor name, not the hostname).
Since this is an embedded device for a custom ...
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0
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Network bridge between Termux and Alpine Linux QEMU
I have an Android phone with Termux. Using Termux I downloaded Alpine Linux x86 QEMU.
The problem: Other devices on the network cannot ping and communicate with the Alpine Linux QEMU. So that's why I ...
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1
answer
26
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Libvirtd/Qemu routed network mode problem with two virtual networks
I have a persistent problem with my virtual machine host. Host machine rebooted recently and after that one out of the two virtual networks stopped working.
The network topology that I have is a /26 ...
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Debian virtual machine no connectivity with two network adapters
I am running several Debian 12 (both host and guests) virtual machines using VirtualBox.
All of a sudden, today they started having connectivity issues (i.e., I couldn't ping 8.8.8.8). I recently ...
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Why does tshark display "TLSv1" despite curl showing TLSv1.3 in the "Client Hello"?
The output from curl indicates TLSv1.3 (OUT), TLS handshake, Client hello (1). Use --tlsv1.3 to force it to use TLSv1.3:
$ curl -6 --tlsv1.3 --tls13-ciphers TLS_AES_256_GCM_SHA384 -vL https://...
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Could nmap local network scan affect network general speed and/or performance?
For the past few days I've been trying to monitor my local network to look for new device connections. At first I thought of arpwatch, but if I'm not mistaken, it is worthless if not running on the ...
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1
answer
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Customized system cannot obtain dynamic IP？
I am customizing the system using version 6.4.0 of the kernel, and the file system is created using busybox. However, I don't know why enp3s0 cannot obtain an ip. It seems that using udhcpc can obtain ...
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Alpine Linux: Can I bridge the eth0 to WiFi?
The problem: I have Alpine Linux downloaded on my phone, but it cannot be pinged by other devices on the network. It seems to have its own IP address and gateway that is different from the network. My ...
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How do I connect Alpine Linux to WiFi?
The problem: I have Alpine Linux downloaded but it seems to have its own IP address and gateway that is different from the network. My network has the range of 192.168.1.X/24 and gateway of 192.168.1....
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Datagram sent to gateway instead directly to destination host in local network
As this was out of scope for networkengineering, let me ask this here again as this is related to the linux network stack.
I have following setup/situation:
---------------------
...
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iptables allow host for isolated VLAN
I'm having a real trouble trying to do a "simple" tweak in my network. So:
there are two sites, A and B and are connected via IPsec and there's no problem in communication between them.
...
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Netskope DNS within Linux Container not resolving
I am using Netskope on Debian host OS,
App in docker container is unable to resolve private DNS eg: corp.cloud,
while on host OS, private DNS is resolved OK.
Using Netskope on Windows host OS, App in ...
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How do I get per-port traffic statistics when using DSA?
I have an embedded device running OpenWRT. I have recently started testing with the newer (23.05-rc3) builds that use the DSA (distributed switch architecture) feature in Linux. One of the issues I am ...
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Performance problems when running Wireguard between virtual machines
I’m running into performance problems with Wireguard tunnels running between two virtual machines on the same hypervisor (running under Qemu/KVM) and I would greatly appreciate any insights/advice ...
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1
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Redirect port using TC BPF
I'm want to use TC BPF to redirect incoming traffic from port 80 to port 8080.
Below is my own code, but I've also tried the example from man 8 tc-bpf (search for 8080) and I get the same result.
#...
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1
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AP routing by VPN and rest by default
I have an orangepi (armbian) with an Ethernet interface (eth0) where I set up an interface (wlan0) for an AccessPoint and installed a VPN client (tun0).
The objective is:
All traffic from the wlan0 AP ...
0
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1
answer
14
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kubectl timeouts when reaching a cluster in VPN
I have a very strange issue - my kubectl cli cannot reach a cluster inside a VPN.
My context:
os archlinux
kubectl Client Version: v1.28.1 (latest)
curl to the api endpoint works well from my pc
...
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How do I find out what is stopping a sit tunnel routing?
In my town, IPv6 does not exist with any provider. I own 2001:67c:2284::/48 which I announce with Vultr.
I am trying to set up a SIT tunnel to use 2001:67c:2284:1::/64 from my office using nmcli but I'...
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45
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Reject a specific IP address from DHCP server and ask for another one
How can I configure Linux to reject a specific IP from DHCP server?
I mean I do not want my lan interface to get assigned 192.168.0.12 under any circumstances.
Is it possible? I have found on /etc/...
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docker bridge can't reach external address defined as `route via`
I have 3 raspberry pi in a daisy-chain network, with ip routes and iptables accept fwd - all three hosts can reach each others:
A <--> B <--> C
However a container from docker-compose ...
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How is my _gateway ARP entry address resetting itself to a "hardcoded" value?
I've got an ubuntu linux PC on a private 192.168.x.y LAN. It's got an IP on the 0 subnet (192.168.0.y) and is able to ping other PC's on the 0 subnet. It looked like the _gateway MAC address had been ...
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1
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Can't ping devices on LAN
I've got 2 Access Points attached to my laptop's ethernet port via a PoE switch. I've assigned static IPs & names to them with dnxmasq (successfully, I believe). However, ping and ssh say they're ...
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Route traffic to different IP addresses while using a single outgoing IP
So I have 3 servers, each with his own public IP address. Now I also have a virtual IP(178.x.x.x) that's publicly accessible and it's mounted to one of those servers.
The virtual IP can be moved ...
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1
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Should the routing table only be applied to outgoing packets (not forwarding)?
I am trying to get packets forwarded from device A to device C, through device B. I thought all I have to do is on device A say: packets for C must go to B, and then B knows where where C is so all ...
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Network Manager autoconnect not always work
On a Buildroot environment for RPi 3 B+ I have this connection file:
# cat /etc/NetworkManager/system-connections/mark.nmconnection
[connection]
id=mark
uuid=0f285419-2238-4b94-ad48-577a1a5f3765
type=...
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How to make all Windows network interfaces visible (and usable ) in WSL2?
I'm a student, I'm currently working on a project with the goal of integrating MultiPath TCP (MTCP) into WSL2. However, there's a significant challenge we're facing: WSL2 only exposes a single "...
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Check whether a given host can be reached via a given interface (`tun0`, created by OpenVPN)
I have multiple network interfaces on my Linux system. Some physical (eth0 etc), other virtual (tun0 etc, created by OpenVPN).
Is it possible to check whether a given host (IP address) can be reached ...
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1
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Cannot connect to Wi-Fi: Wireless toggle is not displayed [closed]
I just bought a new laptop (Lenovo IdeaPad Slim 3, if it's relevant), it had no OS and I decided to install Mint. The problem is that I cannot get Wifi to work.
When I click the network manager icon ...
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