Questions tagged [networking]
Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.
15,659
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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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0
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32
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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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1
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29
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Networkd Carrier Loop And Conflicting Default Route Declarations
I got this system with 2 NICs, 4 ports on each and a total of 7 are up and used. For some reason networkd goes in a carrier lost and gained loop. One of the ports goes down, but is shown as up, no ...
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23
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What's the correct way to set up a network with multiple upstream routers? [closed]
I have a physical network topology that goes from
Modem, to
OPNSense Router (subnet 192.168.0.0/24), to
L2 Managed Network Switch, to
Various LAN clients, including
TP-Link Router (subnet 192.168....
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1
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33
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Change netmask subnet on server because of smaller IP range
I am running a few Ubuntu 22.04 servers, all with just one IPv4 address configured. However I've had the luxury of having a /24 IPv4 range to my disposal. The datacenter requested some IP's back, and ...
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1
answer
28
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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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1
answer
25
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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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16
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Routing is not working using tun2socks? [closed]
Tu2socks Binary & for routing
netsh interface ipv4 set address name="Interface" static 10.0.85.2 255.255.255.0 10.0.85.1
netsh interface ip set dns name="Interface" static 8.8....
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1
answer
141
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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, ...
1
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1
answer
61
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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
answers
98
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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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0
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34
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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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1
answer
67
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Route all TCP traffic from port to another host:port [closed]
I have a wireguard config, creating a VPN between a remote server (10.0.1.1) and my local machine (10.0.1.2), so that the server can reach the local machine and vice versa.
I'd like the server to ...
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1
answer
99
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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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12
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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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8
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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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9
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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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2
answers
53
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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 ...
-1
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1
answer
50
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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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19
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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
answer
52
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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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14
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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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31
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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
answer
129
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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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1
answer
45
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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 ...
0
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1
answer
31
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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). ...
2
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0
answers
84
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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 ...
1
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1
answer
161
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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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0
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50
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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
answer
82
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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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0
answers
22
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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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30
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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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0
answers
42
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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
33
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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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1
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77
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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 ...
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0
answers
52
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IP6tables does not apply ACCEPT rules
My server is an IPv6 only server, I'm trying to write firewall rules using ip6tables and it looks something like this
Chain INPUT (policy ACCEPT)
num target prot opt source ...
0
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1
answer
45
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IP redirect Lets encrypt
Here is Lets encrypt documentation regarding http validation:
"Our implementation of the HTTP-01 challenge follows redirects, up to 10 redirects deep. It only accepts redirects to “http:” or “...
0
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1
answer
47
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kubeProxy unable to get node ip
I currently running a k8s cluster setup where I have 3 master nodes and 3 worker nodes installed with Kubeadm. Each one of the master nodes is responsible for managing a worker node. In one of my ...
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1
answer
69
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Weekly reboot of network switches [closed]
Seeking opinions on a perplexing IT practice: a company regularly reboots customers' switches weekly. This seems counterintuitive and could lead to issues, especially with multiple connected devices.
...
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1
answer
78
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RHEL + how to know the limit of concurrent connections number per port?
how to know the number of concurrent connections per port on RHEL 7.x machines
for instance, let say we connect to port 9080 with XXXX concurrent connections.
wget http://server_mngmnt.jupiter.com:...
2
votes
1
answer
310
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How to set iptables to block incoming requests to the server but still have internet connectivity
I have multiple services that are running on my server. But I do not want them to be exposed to internet. My input chain rules look something like this
-P INPUT ACCEPT
-P FORWARD DROP
-P OUTPUT ACCEPT
...
2
votes
1
answer
148
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What is the difference between Loopback Interface and Dummy Interface in Ubuntu 20.04
I would like to know whats the differences between loopback and dummy interfaces in Ubuntu and how they behave.
Because when I assign /24 IP address on Loopback interface and route this range in my ...
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0
answers
28
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Routing all traffic via VPN except SSH tunnel
I have the following idea.
I route all my Windows PC traffic via SSH Tunnel (Dynamic) to my Server.
Then I set up a VPN connection to a remote VPN server.
What I want to achieve is to route all trafic ...
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0
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37
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Can I run a DHCP server using Docker Swarm?
I am using PiHole inside Docker as my DNS server, I want to enable the DHCP server functionality but I am running in Docker Swarm and I am not certain if it can handle broadcast requests at least it's ...
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0
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31
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How can I change the cipher suite on wpa_supplicant
I started to use wpa_supplicant to configure a MacSec connection with another computer, the problem is that there are several options that I do not find in the template of wpa_supplicant.
https://w1....
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0
answers
40
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2nd network with 10G NIC on vSphere Cluster
I am installing Vsphere 8.0U2 Essential Plus on 3 Dell servers, each having 2x32C AMD CPU, 256GB RAM, 2x1G ethernet port, 2x10G dual port NIC along with 1xME5012 iSCSI storage with direct connectivity....
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18
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Netplan not changing active port when arp ip target is not reachable
I am trying to configure Ubuntu server 20.0.4 with netplan and use dual copper lan port and optical convertors to achieve redundancy.
in my config I have bond created of two interfaces
bond-lan:
...
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1
answer
80
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iperf3 download and upload test simultaniously giving abnormal results
I have a server (Lenovo using Ubuntu) and 2 clients (both Mac). The server is connected with a Wi-Fi router over Eth interface. The two clients are connected with Wi-Fi router over WLAN interface. All ...
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0
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17
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Ansible Inventory dynamic Host dependency
I want to run a specific command on an ansible group. However this command (device upgrade) makes this device unavailable, also it makes child devices unavailable as well.
Is it somehow possible in ...
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0
answers
21
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Self hosted domain does not respond from local network [migrated]
I have a self hosted website with domain example.com
I have a static public IP on my router and I port forward (80 and 443) from the router to my server, passing through a nginx reverse proxy.
If I ...