Questions tagged [networking]
Networking refers to the technologies and techniques that enable the interconnection of devices and applications allowing them to communicate electronically.
15,665
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Can't ping / access GNS3 PFSense virtual device but can ping GNS3 VM on same subnet
I have a basic GNS3 network that I’m trying to setup with PFSense. I have managed to install the PFSense module and can now add it as a device within GNS3.
However after adding, configuring and ...
0
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1
answer
119
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iptables not accepting my rule
I am trying to add a rule to my iptables, so that traffic trying to connect on port 9091 is forwarded to a different IP address. When searching I found this answer, which seems to fit my exact use ...
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1
answer
111
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Centralizing Multiple VPN Connections to Avoid Client Conflicts on Employee Laptops
I work for a company that delivers support to multiple healthcare institutions. Each of these institutions requires us to connect via their specific VPN software using individual accounts provided to ...
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1
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194
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How to access pfsense's LAN without vpn?
I have the following setup and want to access both server A and server B by their IPs from the workstation without VPN and without port-forwarding.
What I have tried so far is:
In pfsense_1, I added ...
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57
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KVM Virt network setting to be on the same network as the host?
As described in here How to Install KVM on Ubuntu 22.04 Step-by-Step I've done a series of commands:
$ sudo vi /etc/netplan/01-netcfg.yaml
network:
ethernets:
enp0s3:
dhcp4: false
...
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0
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395
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SSIS package cannot see network drive
I have an SSIS package that cannot see a network folder (with files) - when run directly from SSMS. (Windows Server 2019, SQL Server 2019, Visual Studio 2019, SSMS versions 17 & 18). I am using a ...
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166
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GKE and multiple VPN
I have a GKE autopilot cluster where I deployed a workload that needs to connect to two SQL databases via two different on-premise VPNs. The network is on another project and it is a shared VPC.
The ...
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1
answer
54
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How to check total operating hours for Cisco Catalyst switches?
We bought about 25 Cisco Catalyst (9300 & 9500) switches and about 200+ SFPs from a distributor with whom we've had trouble in the past - i.e. they sent us refurbished hardware when we ordered new....
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86
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Windows service on Windows Server 2019 stops accepting IoT device connections on public IP address and domain name
We are investigating an issue on Windows Server 2019. It runs a Windows Service that accepts TCP/IP connections (TCP/IP service bound to IP address 0.0.0.0, so listening on all network adapters). ...
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116
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Host A in VLAN is not responding to ping from host B, but host A can ping host B
Overview: I have a issue where one host A in VLAN is not responding to ping from host B, but host A can ping host B .
A= Windows and B=Linux, VLAN=10.
A IP address = 192.168.10.100,
B IP address = 192....
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142
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DHCP and DNS on a custom internal vSwitch?
In Win 11 I've configured in Hyper-V a custom internal vSwitch with NAT as follows:
New-VMSwitch -SwitchName 'VM NAT switch' -SwitchType Internal
New-NetIPAddress -IPAddress '192.168.2.1' -...
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1
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74
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Monitor of Azure Express Route
I would like to monitor our Express Route. There is a good description on how to do this on Microsoft learn: https://learn.microsoft.com/en-us/azure/expressroute/how-to-configure-connection-monitor
...
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3
answers
1k
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Pods in a specific node don't have internet access
Pods in a specific node (let's call it mynode) don't have access to the internet, remaining pods scheduled in other nodes do have internet access.
mynode has access to the internet, I can ssh into it, ...
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188
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Create VPN server on Windows 2022 server programatically
I'm migrating VPN server from Windows Server 2016 to Windows Server 2022.
This time I want to create it programmatically/automatically (IaC way)?
On Windows Server 2016 is the build-in Windows VPN ...
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1
answer
179
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Configure kubectl command to access remote minikube cluster on virtualbox debian VM
i have set up successfully on debian minikube with simple cluster
Debian VM :
umen@debian12:~$ kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-77c947d946-jq2s4 1/1 ...
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148
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Requests between docker containers on same host using the public IP
I have a server with Docker and some containers executing. The host has a public ip and a service listening on port 80 from one of the containers.
If I try to wget the service using the public ip from ...
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242
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Internet Traffic blocked when trying to surf in Edge Sandbox Mode (Windows Defender Application Guard)
I have successfully activated Windows Defender Application Guard but it seems surfing in Edge Sandbox Mode has been impossible. All required gpos and addition requirements as described on here:
https:/...
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43
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Azurite kubernetes ip
I'm running azurite inside a K8s cluster on kind.
When trying to access it from another pod I get a strange issue.
If I use the service DNS name it fails but if I use the cluster IP it is mapped to it ...
1
vote
1
answer
324
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Iptables block incoming connections to network interface from subnet
I have a Linux machine that uses Hostapd to serve a WiFi hotspot. I also have a Raspberry Pi that connects to this WiFi hotspot as a DHCP Client. The Linux machine has a Cellular interface and shares ...
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1
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653
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LACP between Ubuntu 22.04 and Open vSwitch: Ubuntu neither responding nor sending LACP PDU
I have a a fresh Ubuntu 22.04 running in KVM with 6 virtio interface emulating e1000. This is connected to an Open vSwitch and LACP is configured on both switch and Ubuntu.
Summery of my problem is ...
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1
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197
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How to change domains network route to custom IP when curl?
On Linux I do curl to api.binance.com website and it gives me very long ms latency 0.177s, although the server is located just near binance servers.
# curl -o /dev/null -s -w 'Total: %{time_total}s\n' ...
2
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0
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108
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Slow access to files on network drive from Hyper-V guest
Windows Server 2022 with Hyper-V on Dell PowerEdge R550.
On Hyper-v there is a Windows Server 2016 guest which is an Active Directory Domain Controller.
Accessing a file from Windows Server 2016 is ...
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0
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132
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Webapp in Azure huge time network response and latency compared to AWS
I own a pretty simple WebApp, based on php/mysql/redis/nginx.
I was trying to move the server to Azure, to see if I could save some money, and today I created a WebApp on Azure using the wizard UI of ...
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219
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OpenVPN Server on K3s Kubernetes Cluster: No Internet Access
I've set up an OpenVPN server on a K3s Kubernetes cluster. While I can successfully deploy the OpenVPN server pod and connect from a client machine, the client doesn't have internet access through the ...
2
votes
1
answer
231
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Services attempt to bind to IPv6 address before it comes up
I have a couple of services on Ubuntu 23.04, BIND and Nginx, which are configured to bind to specific IPv6 addresses. However, they fail to start because systemd attempts to start them before the IPv6 ...
0
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1
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201
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What could be reason of this periodic drop in throughput in my application when deployed on Kubernetes?
I have multiple microservices talking to each other over network. When these microservices are deployed on Kubernetes, my application is experiencing a periodic drop of throughput on loadtesting, ...
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1
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149
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Point-to-point network between three servers [closed]
I have a three servers, each of which has two network ports. I want to connect these servers using point-to-point connections without using a switch.
Here is a diagram of what the physical connections ...
0
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0
answers
156
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Unexpected behavior with AWS Firewall and Default Stateful Rules
I have configured an AWS Firewall in our testing account, pretty much following the standard setup procedure as documented by AWS. From our private subnet, outbound traffic heading to the internet is ...
2
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0
answers
206
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How to debug curl when netcat works?
The following cURL command hangs:
$ curl -v http://1.1.1.1/*
Trying 1.1.1.1:80...
* Connected to 1.1.1.1 (1.1.1.1) port 80
> GET / HTTP/1.1
> Host: 1.1.1.1
> User-Agent: curl/8.3.0
> ...
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2
answers
142
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Aruba 1930 to build Lab Network separated from office network
Here is the network i need to build for our company lab:
Note: All is centered on the Aruba 1930.
Network A - 192.168.178.xxx/24
Port 25 on Aruba, SFP+ 10 Gbps -> Cisco SFP+ Gbps -> Router -> ...
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2
answers
259
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Windows DNS Lag and Timeouts
I've recently migrated some 2012 R2 servers to Server 2022, including some domain controllers.
Everything appears to be fine except that one of the VMs is behaving strangely when attempting name ...
0
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1
answer
105
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Linux Server offline briefly every 30 minutes and 10 seconds
I have a very odd situation with a Linux Server (Fedora 38) that goes offline exactly every 30 minutes and 10 seconds. Nothing can ping it and it can't ping anything for a second or two, then it's ...
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87
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K3s - Two pods in the same CIDR subnet doing SNAT in a cluster
We have a multi master k3s cluster with etcd. We have launched 2 pods in deployment and both get the IPs from the same CIDR i.e., 10.244.0.xx. cni0 interface ip is 10.244.1.1 on node 1 and 10.244.0.1 ...
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2
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953
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I can't access my Postgres server remotely
I have a Postgres db running on a linux server in my home. I want to be able to access it from my public IP address remotely but it seems not to be working.
I have listen_address = "*" set ...
6
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2
answers
1k
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Can a gateway use the network address, or can the network address be anything other than the first number in that subnet range?
We were sent the following gateway info from our ISP:
gateway: XXX.XXX.XXX.8 /29
I am Xing out the first three octets for privacy purposes because they will remain the same in a /29 network, and we ...
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0
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223
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RTNETLINK answers: Invalid argument when adding route when creating a macvlan on a different subnet
I am using a Synology NAS linked to my network via ip 192.168..13 on Eth1. Now I want to instate a Macvlan on it so I can provide my docker containers with their own ip and full range of ports.
My ...
1
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1
answer
72
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Windows Server 2019 erroneously changing the subnet on NIC1 to /24 after each reboot, but it should be /22
Every time I reboot this Windows Server 2019 VM, Windows changes the subnet from 255.255.252.0 to 255.255.255.0 which is incorrect. The subnet must be /22 (255.255.252.0) for traffic to pass.
I found ...
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1
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601
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How to make Kubernetes Network Bridging work like a Hypervisor
I'm trying to get this working for three days now and I just cant come up with a proper solution. I have an existing environment with virtual machines and I want to do a very simple thing:
Create a ...
5
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2
answers
265
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Am I doing this wrong? Networking - High Availability: SAN, MSFT Failover Cluster, NIC Teaming
I have been working in a lab environment to figure out how to design a SAN with a Microsoft failover cluster using multiple NICs, MPIO and iSCSI. I'll try to add as much useful information as I can, ...
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0
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68
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How to prevent ethernet issues after command line shutdown in CentOS7?
I'm running into a frustrating issue with a system running CentOS7. There's an Intel NIC (Intel Corporation Ethernet Connection (2) I219-LM (rev31)) which, when working, provides a 1000Mb/s connection....
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1
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137
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Experiment with DNS server resolution DENY policies doesn't work as expected [closed]
I am experimenting with DNS server resolution DENY policies, and it doesn't work as expected. Here is the general idea:
A test non-domain member with no special settings Windows PC with no special ...
0
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1
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75
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Windows can't reach IP host through two routes
Problem: Windows 10 can't reach an IP host behind two routers, where the path is specified in static routes.
Windows has the following setup:
Windows Host (192.168.3.1/24 for the local LAN with ...
1
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1
answer
182
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25 second delay between TCP connection and HTTP Connect through new proxy
I have an application server which makes calls to an external service through the corporate proxy, and it has been running perfectly fine for some time. We are in the process of switching to a new ...
0
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1
answer
60
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Site to site routing rules
I have installed strongswan tunnel to Site to Site vpn providing in our datacenter. I have in iptables set up masquerade. That is working fine.
But now, I want to setup that same traffic with routing ...
-1
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1
answer
511
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Docker macvlan container has no internet access while running tailscale on host
I have the need for a Docker container that is visible in the host network with its own ip, mac and hostname advertised via avahi. (I want to use wire-pod without changing hostnames and stuff on my ...
1
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0
answers
127
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transparent bridge: is nat possible anyway with nftables?
I two 10gb NICs(eth1,eth2) in one card configured as bridge(br0), and PC( with ubuntu 22.04)'s own nic(eth0) for accessing it, only. I am making this a transparent bridge for filtering undesired ...
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71
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Spot instance sometime slow down and loss connection
I have a system deployed in AWS EKS, sometimes spot instances metrics is down, and API call to these nodes are very slow. Here is my system:
1 EKS cluster
1 on-demand node group
1 Karpenter v0.29.2 ...
-1
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1
answer
130
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Setting up school wifi network with SSO linked to azure AD without local server
I am trying to restrict school Wi-Fi usage to staff and students. In addition would like to get user-wise usage data. Our current Wi-Fi network and access points are built on Cisco Access points and ...
2
votes
1
answer
193
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Port forwarding fails with two DHCP Servers/routers on the same network
TL;DR I have two routers and a switch, and have forwarded port 80 on both routers to the switch, but depending on which router gives the switch its IP, it'll have that as its default gateway, and I ...
1
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0
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197
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Use Node IP's instead of Pod IP's for egress with Secondary CIDR
I'm working with an Amazon EKS cluster that uses AWS VPC CNI for networking and has a custom network configuration. The primary IP address of the nodes is in the range 10.x.x.x/x, and there are ...