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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How to configure Asterisk server in ubuntu [closed]

I have installed Asterisk server in ubuntu, I want to configure the asterisk server so my two clients 7001 and 7002 can communicate with eachother via, meessege, call and videocall.
6 votes
2 answers
12k views

Adding a new DNS server with systemd-resolved

To access other machines on my network by their name, I have to add the following two lines to my /etc/resolv.conf: search foo.local nameserver 192.168.X.Y But any changes I make do not persist ...
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0 answers
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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 ...
0 votes
0 answers
15 views

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. ...
1 vote
2 answers
4k views

Installed gitlab-ci but only nginx welcome page shows

I installed gitlab-ci using this guide and everything has gone pretty well. I got to the end of the tutorial and when I go to the ip address of the server I only get a Welcome to nginx! screen. I'm ...
-1 votes
0 answers
37 views

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 ...
0 votes
0 answers
24 views

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 ...
0 votes
1 answer
26 views

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 ...
0 votes
0 answers
20 views

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 ...
1 vote
2 answers
2k views

Beginner What is asterisk stands for on local address

I am new to ubuntu server as well as server too. When I am checking the open port using command 'netstat' .On the column of local address, there is *.http and *:ssh what does * meaning of?
3 votes
1 answer
6k views

Add-NetNatStaticMapping not port forwarding to local VM

I'm running windows 10 build 1809 and have hyper-v installed. I have a Linux machine running behind a NAT with internet connectivity working on IP 10.0.5.5. I basically followed instructions on the ...
0 votes
0 answers
7 views

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 ...
0 votes
0 answers
20 views

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 ...
0 votes
0 answers
25 views

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 ...
0 votes
0 answers
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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 ...
-2 votes
1 answer
90 views

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: ...
0 votes
0 answers
17 views

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 ...
0 votes
2 answers
66 views

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 ...
0 votes
0 answers
49 views

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 ...
0 votes
0 answers
34 views

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 ...
-1 votes
0 answers
25 views

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: ...
-1 votes
0 answers
25 views

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 ...
160 votes
3 answers
990k views

What causes the 'Connection Refused' message?

This is a Canonical Question about Connection Refused We see a lot of questions to the effect When I try to connect to a system I get a message Connection refused Why is this ?
1 vote
0 answers
40 views

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 ...
2 votes
2 answers
78 views

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 ...
0 votes
0 answers
26 views

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 ...
0 votes
0 answers
34 views

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 = ...
0 votes
0 answers
55 views

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 ...
3 votes
2 answers
1k views

AWS NAT Instance Setup

This question was originally posted to stack overflow, they suggested I repost it here (https://stackoverflow.com/questions/76715004/aws-nat-instance-setup). I am currently learning the AWS cloud and ...
1 vote
1 answer
181 views

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 ...
6 votes
1 answer
5k views

Windows 10 arp cache getting stuck after failed attempts when target machines are offline

After upgrading our development team to Windows 10 from 7, we are experiencing an issue with the ARP cache where a machine has the correct IP-MAC mapping cached, but the type is invalid due to failed ...
0 votes
2 answers
104 views

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-...
0 votes
1 answer
42 views

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 ...
0 votes
1 answer
30 views

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 ...
3 votes
1 answer
6k views

Route ip via default gw

For a VPN configuration, I need to route a particular public subnet via the tunnel except one of them, because that IP is assigned to the VPN server. But, because the configuation will fall into ...
92 votes
11 answers
455k views

Testing UDP port connectivity

I am trying to test whether I can get to a particular port on a remote server (both of which I have access to) through UDP. Both servers are internet facing. I am using netcat to have a certain port ...
3 votes
2 answers
4k views

OpenVPN - Blocking client-to-client traffic

I have an OpenVPN server running on a Debian box. What I'd like to do is to block all traffic between clients connected to that OpenVPN server. The server has a local IP of 10.10.10.1 and the clients ...
1 vote
1 answer
143 views

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, ...
0 votes
0 answers
38 views

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"...
0 votes
1 answer
108 views

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....
0 votes
2 answers
54 views

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 ...
0 votes
2 answers
5k views

Issues with Ubuntu Network Setup

Please, someone tell me whats up here, I am going bonkers, I have used multiple calculators etc, everything tells me the details in the image are correct but ubuntu just will not accept.
0 votes
0 answers
12 views

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 ...
-1 votes
1 answer
59 views

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 ...
0 votes
0 answers
8 views

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 ...
12 votes
3 answers
20k views

Interpreting ethtool Coalesce output

Other than tx and rx being the transmit and recieve, can anyone explain what the fields mean in ethtool -c's (Coalescing output) and what effect they have on how coalescing works? Coalesce parameters ...
-1 votes
0 answers
11 views

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 ...
-1 votes
1 answer
59 views

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 ...
0 votes
0 answers
19 views

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 ...
0 votes
0 answers
15 views

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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