Questions tagged [networking]
Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.
15,666
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How would I completely reset network to after-fresh-installation status from Debian installer ISO?
I need to completely reset my Debian VM's network side settings and configuration back to the state of a fresh installation. How can I do that with a Debian installer ISO? I was able to boot into ...
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14
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Wireguard not routing incoming traffic
I have Wireguard setup as a VPN on my Server with my Phone as a peer. Routing on the Server it self works without a problem, but it seems like all the traffic coming from my Phone is just ignored. ...
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What to check on what is blocking my open port on Debian?
I would have posted my attempts but I currently do not have access to this Debian VM... (see related question How do I get myself out of docker hijacked network situation on my Debian VM?)
Anyway, the ...
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How do I get myself out of docker hijacked network situation on my Debian VM?
I ran into a problem with wg-easy docker in trying to set up Wireguard using docker on my Debian VM so I changed network_mode to host as a last resort without learning about the consequences... The ...
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Connections blocked between 2 servers at the same ISP - my fault or hosting company's?
I have 2 dedicated servers at ionos.com, and old one I am trying to abandon and a new one I am trying to migrate to.
In the process of migrating, I discovered that I am unable to connect between the ...
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OPNSense: How to communicate with second network that also act as backup WAN
Drawing: https://i.stack.imgur.com/QjM3a.jpg
Hello. I have two networks with different subnet (please refer to drawing). First network is 192.168.1.0 and second network is 192.168.2.0. The OPN Sense ...
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14
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Bind9 custom rules no answer across subnets
I have a few different local subnets and some apps that I'd like to access with a custom DNS server. I have bind9 setup on 10.0.0.0 subnet and all of the devices on that subnet work as expected.
When ...
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17
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mac address for virtual machine [closed]
My question is that mac address of kali machine does not appear on the other devices on same the lan, instead host machine's mac address that kali linux built on appears.
For example when I do arp -a ...
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49
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DNS issue in Ubuntu [closed]
Ubuntu Server 23.10
My server was working perfectly fine, until one day I woke up to it having no internet.
The server has a static IP address, and I can use it locally, however when I try to run ping ...
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34
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Mixed 10Gbps/25Gpbs on Supermicro AOC-A25G-b2SM (BCM57414)
Working on installing some new Supermicro servers and they're configured with a AOC-A25G-b2SM NIC (2xSFP28 ports). Based on what we can support with our switches, we were planning to do a primary link ...
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Windows Server Hyper-V host Ubuntu guest network down until restart after incident
I have a Windows Server 2022 host with Hyper-V installed. There are two Generation 2 VM's installed, Ubuntu 20.04 and 22.04 LTS servers.
Host machine has a network configuration that looks like this:
...
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25
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Can't access my server when connected to company's VPN
So I hosted a website on a server inside the company network. I could access it through the company's VPN and also without VPN (from within the company). I installed Nginx (and ufw) and after a few ...
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Euler OS based on linux when rebooting the default gateway not updating [closed]
I have an issue with Euleros. When I enter the ip route command, it shows below route
default via 10.10.10.1 dev bond0
I need to modify gateway to 10.10.10.254 so I tried below route commands.
sudo ...
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89
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Proxmox host and VM running on it see different machines on their network using the same connection
I have run into a weird issue when setting up a new Proxmox host with a VM on it which I wanted to connect to our dedicated storage network running on a separated switch.
The setup is the following:
...
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40
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Hadoop + warnings as slow block-receive from data-node machines
We have Hadoop cluster with 487 data-nodes machines ( each data-node machine include also the Service node-manager ) , all machines are physical machines ( DELL ) , and OS is RHEL 7.9 version.
Each ...
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25
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Accessing azure internal container app though P2S vpn connection
I'm a little new to azure networking so this might be obvious but I'm kind of stuck.
I've created an azure VNET. Inside that I've setup a P2S gateway which seems to work fine. I can connect to it and ...
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Web filtering proxy with authentication [closed]
I've got a problem with filtering traffic on Wi-Fi, because we need to have some webfilter with authentication in our local network to filter traffic on http/https ports.
Currently we are using ...
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26
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Adding Aruba switch to monitoring tool via SNMP protocol
I am trying to add few aruba switches to a monitoring platform observium but failing to do so.
the coumminity string and the trap address are perfectly fine but it doesnot seem to work. It would be ...
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34
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K8s - not working L2 Advertising of Metallb
I'm installing 1 node k8s cluster and can't reach metallb IP address from same subnet.
CRI = Containerd 1.6
CNI = Flannel.
control-plane taint is disabled
Pod CIDR = 10.244.0.0/16
Cluster CIDR = ...
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55
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dns problems in self managed aws ec2 cluster with aws-vpc-cni
I'm new to k8s and I've been trying to learn it. I faced a problem with trying to setup aws-vpc-k8s-cni on my fresh k8s cluster with coredns. Here's the problem in detail.
Cluster & Network ...
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2
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66
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Change netmask subnet on server due to reduced IP range allocation
I am running a few Ubuntu 22.04 servers, each with one IPv4 address configured.
Currently with a /24 network allocation, the datacenter requested some IP's back, and now I am left with a /28, which is ...
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42
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Could a faulty switch cause upload speeds for some to be slow?
We have recently switched our MSP which has caused a lot of problems with our network, but most of that is fixed and we've got one issue remaining: Half the people in our office have poor upload ...
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30
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MQ broker in private or public subnet?
I'm setting up an MQ broker in an AWS environment.
The MQ broker will be used by both services running in that AWS environment as well as services running in other locations.
All other services ...
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1
answer
143
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Fetching Netcat Response
Netcat is being used to create a listener on port :1000
while true; do echo -e "HTTP/1.1 200 OK\n\n $(date)" | nc -l -p 1000 -q 1; done;
Navigating to X.X.X.X:1000 in a browser, ...
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2
answers
78
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403 from Google certificate endpoint when using IPv4
I am using the library google-auth~=2.28.1 to enable "Login with Google" in my webapp.
The login works on my local computer and on the test-server (hetzner), but on the prod-server (also ...
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2
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104
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Knative On-Premise setup without external IP
I am trying to setup Knative on On-Premise Kubernetes Cluster (without having an external ip).
Kubernetes: v1.28
Knative: v1.13
1 master node and 2 workers
https://knative.dev/docs/install/yaml-...
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38
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VirtualBox randomly resets VM's network
I have a VM which is running by VirtualBox 6.1. Ubuntu Server 18.04 is installed on hypervisor and Ubuntu Server 22.04 is installed on VM. The internet on VM works through "Host-Only Adapter"...
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108
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Debian server unable to connect to network
My server is unable to connect to the local network or Internet.
The server cannot ping other machines on the local network. Attempts to reach the Internet fail.
From my PC I can ping local IP 192.168....
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Can I safely add an external network to an existing NIC on XenCenter Pool?
We have 2 servers with 2 NICs each:
NIC 0 has our "Office Network" which is used by the Management interface and our VMs
NIC 1 has our "iSCSI Network" for storage
Both networks ...
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What configuration is blocking local ssh connections to my server? [migrated]
So I recently bought a Raspberry Pi to work on a small passion project with the RetroPie Debian-based image.
I am now at the stage where I want to completely shield the server only allowing specific ...
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11
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Network LOOP on Switch with DATA link and Voice Vlan
I am having a problem with a loop being detected on my network. I have a DATA link from the gateway to a Netgear GS724Tv4 on 192.168.0.0/22 and a VOICE link from the gateway to the Netgear GS724Tv4 on ...
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54
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Why is https communication not working with iptables?
I'm trying to configure iptables for security settings.
Basically, I set up a whitelist and tried to test it.
I set the following settings to allow ssh, http, and https to my server by allowing input ...
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1
answer
59
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No DNS record or entry in Host file, but can still access IIS site?
We have a VM in azure (with no Public IP), that has a bunch of sites inside the IIS. These sites are only accessible from inside the VM or whilst being connected to our OpenVPN. There is no DNS record ...
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Three routers, one switch [migrated]
I have a problem. The broadband ISP in my area is really unreliable, so I have decided to get an "Airfiber" subscription along with the one I have. The idea is to connect both routers' LAN ...
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1
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58
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PFSense: Subnet can not communicate to the outside
I have multiple subnets on a hypervisor with four Ethernet ports. Two are called subnets. Both of them are utilizing a NordVPN tunnel as their default gateway.
The first subnet LAN can talk to ...
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Accessing adjacent remote network from existing network tunnel in pfsense ipsec
We have two offices, A and B, with IP segment 192.168.10.0/24 and 192.168.20.0/24 respectively, connected to each other using IPsec tunnel mode.
Additionally, office B has an IPsec tunnel mode ...
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53
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Kubernetes Cluster Initialization Fails with Kubeadm and CRI-O on Ubuntu 22.04
I am setting up a Kubernetes cluster on Ubuntu Server LTS 22.04 using Vagrant, with Kubernetes version 1.28.7 and CRI-O 1.28.2 as the container runtime. I'm encountering an issue when initializing the ...
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1
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138
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How to do VPN split tunneling for urls and IP addresses on Windows 11
On Windows 11 I want any traffic going to long.dns.name.amazonaws.com (DataGrip Redshift connection) and http://n.n.n.n:8000/ (Airbyte hosted on EC2 with an elastic ip) to be routed through my VPN, ...
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51
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Why does MySQL server not respect bind_address?
Background
I'm setting up a MySQL server. Its configuration file (my.cnf) does not have the bind_address option. As I understand from its documentation, its value defaults to *, which should make the ...
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1
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48
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ath9k driver sees only some Wi-fi networks
I have PCI Wi-Fi adapter:
06:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)
using ath9k driver. When I boot into Windows I can all all networks(including mine AP). ...
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How Linux kernel selects the source IP of outgoing data packets?
I have multiple IP addresses assigned to a network interface, each corresponding to a different outbound IP.
:~# curl --interface 112.73.59.255 ip.sb
157.119.73.25
Using the above command, I ...
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1
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177
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Port unreachable when wireguard is connected
I have a server that routes all of its traffic through wireguard. When I start the wireguard, all ports listening on this server's public IP are unavailable - even ssh does not work.
What I want is to ...
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23
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Rac installation nslookup finds the ip address but fails
I have installed dnsmasq on my linux rac instance. While trying nslookup it finds all the 3 scan ip address but at the end it says
**** server can't find ol7-orcl19c-scan: REFUSED.**
Given below are ...
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52
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Windows RRAS NAT Behind Router in Passthrough
The configuration we are currently running is as follows:
Consumer grade router set to pass-through all traffic to the address 192.168.1.21
Windows Server 2022 with static IP address 192.168.1.21
...
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1
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88
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Users cant nslookup my windows server 2019 domain
when i ipconfig /all in my server i see this:
IPv6 Address. : 2804:7f0:6880:a506:463a:e968:cf0e:177d(Preferred)
IPv6 Address. : 2804:7f0:6880:e6d7:1e98:ecff:fe2c:2398(Preferred)
the first one is the ...
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23
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Error while deploying a cluster on openstack
Error waiting for instance (f6572108-772b-4680-861a-ef3534968616) to become ready: unexpected state 'ERROR', wanted target 'ACTIVE'. last error: %!s()
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35
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How to set HTTP header globally on a HTTPS Load Balancer?
I'm migrating from Kubernetes to Cloud Run. Currently, Kubernetes Ingress allows me to use Nginx Ingress Controller annotations to set headers globally for all subdmains in a single configuration like ...
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45
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Windows Server 2019 doesn't display my active networks
I have a new server with Windows Server 2019 Datacenter (with Desktop environment) installed. Soon after I installed Windows Update, enable NIC teaming, enabled RDP, enabled Windows Defender, and ...
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1
answer
40
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Isolated bridge in Debian
According to Is it possible to enable port isolation on Linux bridges?, it is possible to create isolated ports in isolated on with the bridge command. This uses the BR_ISOLATED flag for the interface....
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83
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Unable to ping other subnet through IPSEC tunnel
I'm configuring an S2S IPSEC VPN tunnel between two Fortigate firewalls.
The tunnel is up and running. Network topology:
When I ping from the LAN interface, which is directly connected to the ...