Questions tagged [networking]

Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.

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StrongSwan and Bird BGP route propagation

I have the following networks successfully connected through IPSec StrongSwan tunnel (ie. I can ping both sides through private IP addresses): VPS1: 192.168.8.44 -- VPS2: 192.168.1.21 I want to ...
oliva5's user avatar
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Netplan - add secondary IP address and assign label

I saw the same question here, but I can't find it anymore. How can I add secondary IP address and assign a label to it via netplan? I have this netplan config: # This is the network config written by '...
Semyon Bayandin's user avatar
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141 views

IP over LoRa: TCP timeout

I am trying to tunnel IP packets via LoRa. For this I use two devices running Meshtastic. Using ICMP I was able to determine that there is a packet loss of about 30% of the packets and a latency of ...
Marek Küthe's user avatar
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Kafka Scripts in bin Directory throws an error is "java.net.BindException: Address in use (Bind failed)"

I have Deployed Kafka as a Stateful Set on k8's and the Service type is ClusterIP. It's Up & running. However, when I'm logging into Kafka brokers (using kubectl exec -it pod_name -- bash) and go ...
RAM's user avatar
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Proxmox cannot route port from network bridge

I set up proxmox instance, all is working fine but i have a problem with port forwarding i have: server A with PUBLIC IP 1.2.3.4 and it's dedicated server (proxmox) server B (VM on server A) in bridge ...
Kaspek's user avatar
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Windows EC2 Networking: packets dropping if PPS is too high

I have a Windows 2019 Server running on AWS EC2 (m5.4xlarge) which is dropping packets under high pressure ("high" in this case is about 10K pps). The bandwidth is doing perfectly okay, the ...
Pavel Gurkov's user avatar
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How can I set up a local DNS or proxy that uses OpenNIC for OpenNIC domains/TLDs, and Cloudflare (or any other) DNS for the rest?

I've been pondering how to achieve this for the past few days. I love OpenNIC and everything they're doing, but sometimes the DNS servers are not always the best for normal, daily usage. While it's ...
hexd's user avatar
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DHCP reservations by hostname and router lease

I'm French sorry if the wording is not perfect. To give you a little context, I don't have any diploma in IT but I joined my colleague in the IT department of our company. He's been dealing with this ...
RodolpheFR's user avatar
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460 views

Access host's wireguard from Docker containers

I have a Debian server that has a Wireguard connection to a box sitting behind a NAT. The box has Wireguard IP 192.168.60.2 whereas the server has Wireguard IP 192.168.60.1. On the server, a few ...
sven's user avatar
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How is it possible to connect multiple devices using the same IP to a machine with multiple interfaces and have them all work?

Long story short, I am a bit over my head with this task as I'm not incredibly well versed in networking and complicated network config. I have a few ideas, but want to avoid wasting time. Background: ...
Douglas B's user avatar
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Use an Openshift edge route to an external VM

I have several VM's running and I have an Openshift cluster. All exposed application in my cluster have HTTPS through Openshift edge routing. Now I would like to add a url and https to my VM's too (...
Herman's user avatar
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VPN setup multi-user multi-network topology

Context I am trying to understand how to best setup VPN access for a group of users and networks. The situation is represented by this network schematic: Site A represents the main network I have ...
Bonvi's user avatar
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2 answers
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Looking for Firmware for Oracle Dual 40 Gb Ethernet Adapter

I purchased an Oracle Dual 40 Gb Ethernet Adapter - documentation here. The card was sold to me as pure Intel. I realised it was OEM after I installed the card and checked it on Linux, but meanwhile ...
cygent's user avatar
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IPv6 route based VPN client with Strongswan, packets arrive but not received by application

I'm trying to set up a linux client PC with a route based VPN tunnel using strongswan and an XFRM interface, with IPv6 (end to end). strongswan 5.8.2, linux kernel 5.15.0 [An aside - I've tried an ...
feca67's user avatar
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Constantly high traffic in local network

I encountered constantly high traffic (~25Mb/s) in all computers in my company office network (image below). It happened after I introduced a VOIP phone system. The VOIP shared same network as ...
DC9's user avatar
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Make knockd listen to a specific IP address

In Knockd how do I listen to a specific IP address from an interface that has multiple IP addresses? Knockd only has the option to listen by interface but not an IP address. For example interface eth0 ...
Jeremy John's user avatar
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What is the meaning/cause of this extra entry in the output of `ip address` when another device connects to the network?

I was recently trying to set up an EspressIf Border Router for my network. After flashing the device and letting it boot, a single-machine Kubernetes host on my network restarted all of its pods (!). ...
Danny Tuppeny's user avatar
1 vote
1 answer
246 views

Cannot access deb.debian.org from VM after port forwarding using /etc/libvirt/hooks/qemu

Setup On host server with Debian Bookworm I created two VM-s (pserver 192.168.122.227 and pagent-1 192.168.122.126) via cockpit (kvm). Both of them are running Debian Bullseye. I am using default ...
Matija Sirk's user avatar
4 votes
1 answer
604 views

tcpdump -vvv is not verbose enough

For tcpdump, I use this command to see the packet details: tcpdump -vvv -i interface and to save the packets into a pcap file: tcpdump -i interface -w output The details from the first command are ...
shadow's user avatar
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DNS Issues with Kubernetes Cluster : no servers could be reached

I'm still experiencing dns and network issues And I'm at a dead point, looking for hints and suggestions Summing up : Following the indications found here : https://kubernetes.io/docs/tasks/administer-...
Raphael10's user avatar
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Configure a server to act as an internet gateway [duplicate]

I have two virtual servers hosted in Hetzner Cloud. The first server (let's call it Access Server) has a Public IP assigned and has internet access. The second server does not has a public IP assigned ...
Arnold Zahrneinder's user avatar
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Unable to ping the vm running with ebpf program

I am using an eBPF program which counts the number of packets received on its interface on my destination vm. At first I can able to ping the vm running with eBPF program that is destination from the ...
Manideep G's user avatar
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191 views

Wireguard with VPS for mobile clients for all traffic routing

I have been trying to configure Wireguard as a VPN for accessing my home network which partially I have been successful. But I still am experiencing problems when trying to make two things happen. I ...
Luke Keude's user avatar
1 vote
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539 views

Unable to access SMB share with DNS Cache service disabled from Windows Server 2022 but it works on Server 2019

I have a requirement to disable the Windows DNS Cache on a new Windows Server 2022 RDS VM. Trying to access a SMB share hosted on a Windows Server 2022 file server, all my servers are joined to a AD ...
tezx's user avatar
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Connect multiple hosts running promtail to loki running on a separate host

Hi all first time posting here. I have 3 different servers. This is the setup I want to achieve: Server1 (51.25.365.12): promtail Server2 (51.25.78.215): promtail Server3 (216.25.36.54): promtail, ...
Curious Developer's user avatar
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1 answer
129 views

How can I run a script whenever my NIC Link speed drops?

I'm having issues with my ethernet dropping down from 10 GbE to 1 GbE and even sometimes down to 100 Mbps. I would like to receive a notification when this happens through something like healthchecks....
Turkeyphant's user avatar
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1 answer
49 views

Established TCP Communication terminates without any clue

I'm not able to understand what might be the reason for a lost TCP Communication over RPC between a CentOS 7 and Windows 2019 Server. From the Wireshark I could see that the TCP Communication is ...
user2264738's user avatar
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1 answer
306 views

Understanding Kubernetes load balancing with ingress controller using self-hosted load balancer

I'm looking to better understand load balancing concepts in a "self-hosted" Kubernetes environment. cluster setup architecture image I have an external load balancer, let's label it LB. This ...
Ryan's user avatar
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MIKROTIK ONE LAN - TWO WAN - TWO GATEWAY how to dispatch internet trafic depending on PC's gateway

On the LAN there are two configured type PC. All PC belongs to the same network (ie : 192.134.234.0/24) but there are two different gateway: 192.134.134.253 et 192.134.134.254.Each of them are ...
felix34's user avatar
2 votes
1 answer
121 views

How to check for faulty device causing short outages in my LAN?

We resolved an issue caused by a broken access point by simply disconnecting it from the LAN. The symptoms we experienced were that now and then, our whole network would get "stuck" for a ...
Theo's user avatar
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Default gateway setup in different networks connected through intranet service

How do I setup default gateway on two different networks connected to a third network (home office) through a provider? the provider provides intranet service. The two sites need access to internet ...
Sakadude's user avatar
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0 answers
150 views

When executing command ethtool -S ethX instead of expected statistics following message is displayed: "no stats available"

It ethtool command only fails on ethtool -S ethX. If I run the command ethtool -i ethX it shows the expected data. This is on RHEL8. It's a known issue apparently, since Redhat itself has a solution, ...
Shōgun8's user avatar
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Getting err_tunnel_connection_failed and err_connection_timed_out when accessing URL

My company has deployed an SSO solution using Duende Identity Server and Okta We are using a proxy as the middleman between Identity Server and Okta: https://apacwelcome.saas.mrisoftware.com 99% of ...
David Klempfner's user avatar
-1 votes
2 answers
86 views

How can I add an additional working IP to a VM?

I have 2 websites working fine on the same IP (92.46.87.48). Is a ubuntu server on a VM. Now I need to assign one ip for every website. I edit the /etc/hosts fine, I just buy an additional IP and now ...
SixSense's user avatar
0 votes
1 answer
159 views

poor docker / nginx throughput when running with bridge network on ubuntu

My nginx configuration seems to offer extremely poor performance through a docker network, while the host machine (a dedicated server) has great specs (104 threads, 245gb DDR4, SSD). When benchmarking ...
Erik Baan's user avatar
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-1 votes
1 answer
164 views

Direct Access IPV6 Routing

So here is the situation... I'm setting up direct access on windows server 2022 and im getting a network adapter error that i need to "Publish the IPV6 routes on the network adapter that connects ...
Chris Sikel's user avatar
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1 answer
47 views

Plug in multiple devices with the exact same IP to one Linux host

I have a need to have multiple devices with same IP address connected to the same host. I am attaching a photo to demonstrate the topology So on the host side the IP is 192.168.19.1 and on the 3 ...
koby058's user avatar
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0 answers
128 views

How to correctly load balance requests from a Java client to an NLB over multiple AZs

Requests from a Java client to an NLB over multiple AZs Not load-balanced Summary: Expectation: every request from Java is load balanced between two nodes. Actual behavior: all the requests go to one ...
ŌHARA Kazutaka's user avatar
0 votes
2 answers
105 views

iptables drop to keep ports silent with no response

I am working on the network telescope stuffs (AKA. darknet, black hole), which need to make the port take no response to outer traffic (ie. when other servers PING or send SYN requests, my server ...
Z4R1's user avatar
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1 vote
1 answer
339 views

Can't reach public IP or domain name of my server from within

Say I have a domain name "my.domain.com" with an A Record that resolves to the public IPv4 address (say 160.200.200.21) of my server (running Ubuntu 20.04) I've installed BigBlueButton on ...
Xsmael's user avatar
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1 answer
363 views

Strongswan on host, docker container unable to pass through

This is my first time posting here, so i'll do my best to explain. I installed an IPSec tunnel on my host (Ubuntu 22.04) using strongswan (bypass-lan plugin). The connection is up and stable, ...
yonisolo's user avatar
1 vote
1 answer
431 views

Docker networking: use the default bridge through a rootless container

Introduction I have an issue with network in docker root-less. I have a folder named rounting-docker a docker-compose with 2 services: version: "3" services: ngnix: image: ngnix ...
p1r4t3's user avatar
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0 answers
289 views

Kubernetes cluster through VPN

I have multiples nodes spread accross differents locations and i would like to use them in a kubernetes cluster (k3s) throught OpenVPN. Has anyone already tried this and could give me some leads ? ...
Nicolas VIOLLIN's user avatar
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1 answer
95 views

Intel e810 nic RSS logic on ESXI platform

I am trying to decipher how RSS (Receive Side Scaling) logic works for Intel NIC on ESXI (Dell) machine. ] vsish -e cat /net/pNics/vmnic2/rxqueues/info rx queues info { # queues supported:8 # ...
Boris's user avatar
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1 vote
0 answers
45 views

GCP VPC IPv6 routing to an OpenVPN instance

Previously, on premises, I successfully setup an OpenVPN server (on Ubuntu) that assigned globally routable IPv6 addresses to VPN clients (which is a project requirement). A generous /48 IPv6 prefix ...
Paulo's user avatar
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0 votes
0 answers
107 views

TCP 3-Way Handshake Issue: Client not responding with ACK

I have a Java application running inside a virtual machine (VM) that uses S3-compatible storage as an object data store. Periodically, the VM is destroyed, re-deployed, and reconfigured. During the ...
sheikhisham's user avatar
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1 answer
645 views

Failed to destroy network for sandbox + coredns pod not running Kubernetes

This is my settings: Kubernetes cluster root@k8s-eu-1-master:~# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-eu-1-master Ready control-plane ...
Raphael10's user avatar
  • 157
0 votes
1 answer
112 views

connect two interfaces and docker containers

There are two containers witch are on same network compose example: version: '3.8' services: A: image: alpine:3.18 container_name: container-a B: image: custom-alpine-...
MrM's user avatar
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1 vote
0 answers
255 views

How to use dnsmasq in another docker container as a DNS server?

I need to create a local DNS server just for containers, for whitelist domain addresses. dnsmasq.conf port=53 domain-needed bogus-priv bind-interfaces no-resolv strict-order server=/google.com/8.8.8....
Lucifer's user avatar
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0 answers
153 views

Proxmox LXC Networking with public IP

I have a bare-metal Proxmox server running with two public IPs. The initial configuration has already been done, and the containers are running with a NAT and a private network. I currently have 2 ...
RobGTX's user avatar
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