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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DCHP server on virtual machine in HNVv1 virtual network

I've got a virtual machine with Windows Server 2016 Datacenter, Hyper-V nested virtualization on the host operating system switched on for this virtual machine and Hyper-V role installed on it. PS C:\...
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3answers
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I want extend CAT5 cable, more than 100m

I have a track like 130 meters. CAT5 cable limit is 100m. Is it possible to cut it in half and get a switch in the middle of the track? Will it work?
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Performing tasks and custom logic on network packets

I'm looking for a way to process packets in a Linux server in a particular fashion - I need to run some custom logic on every packet, then (possibly) take some actions on the packets and let the ...
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Domains not working on new ip block

I have two domains who not working: ko-bookmaker.com 176.31.75.117 1x2bukkumeka.com 176.31.75.118 I added IP block 176.31.75.116/30 to network configuration but domain still not working. I'm ...
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What is the difference between Telnet, SSH and FTP? I understand last two but Telnet is what am having issues with

In my understanding, SSH is what we use to connect to a remote server (it can be a normal computer as well with ssh enabled) and get access to the terminal like we get while using a physical machine. ...
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My centos based m2m gateway not Forwarding packets from l2tp to eth1

I am getting data from a remote RTU (192.168.100.2) to my server through L2TP on peer ip (168.18.13.3) over public ip defined on eth0. I configured eth1 with 168.18.13.1 And this is connected to ...
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67 views

Linux bonding Mode 1 (active-backup)

I'm trying to configure the bond (active-backup) on three server (one act as storage) with 2 nic and 4 ports using 2 switches (ISL is present). The goal is to not break the connection to the storage ...
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1answer
36 views

why iptables is still blocking the port?

I have a problem regarding iptables: Everything works fine and as it should,except the last rule I added and I don't get why iptables is behaving like this. Especially because everything else is ...
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11 views

How to bypass specific port in a container that runing wireguard?

I want to run a docker container that containing wireguard and qbittorrent on VPS. After wireguard runs, all traffic enters the tunnel, but I need webui port 8080 to control the qbittorrent. How to ...
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48 views

nslookup failures *** UnKnown can't find www.vmware.com: Query refused

I am on a VMware environment. On the host machine I do C:\WINDOWS\system32>nslookup www.vmware.com Server: UnKnown Address: 109.169.85.7 *** UnKnown can't find www.vmware.com: Query refused ...
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Looking for a network switch with multi network management capabilities, load balancing and web management

I am looking for a network switch that provides a few features: 1 - Manage multiple network ranges - I have 2 public /27 ranges, which I would like to manage from the switch, for example what IP ...
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1answer
19 views

Does a reverse proxy use subdomains to know which private IP to route to?

I know this is very basic, but I'm very new to the reverse proxy, network admin world. Could someone provide a high level overview how a reverse proxy knows which server/port to route traffic to? Does ...
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1answer
20 views

Server communication with itself over public IP

If a server sends a message to its own public IP address, does this message ever leave the server? If yes, can I configure a firewall to open a port only for messages from itself? Context: I ...
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39 views

VPN via raspberry Pi

So, i next setup. Laptop (Master PC) Server with OpenVPN a lot of clients(Slave Pc) which connects to another pc (with static ip) Goal is to make virtual network, that i can reach (remote another pc)...
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2answers
82 views

internet connectivity failure in virtual machines on workstation

I have VMware workstation environment on my laptop. Also there are 2 Wifi cards. The configuration of VMware virtual network editor is following vmnet8 and network setting for virtual machine network ...
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0answers
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Dell PowerConnect 2724 VLAN frame type filtering issue?

The endless VLAN headaches (and questions), eh? I really have no idea how to title this one, do not judge. I'm currently configuring VLANs on a Dell PowerConnect 2724 switch. Currently, all ports ...
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22 views

Windows network resource monitor shows active ipv6 connection, but the machine has no ipv6 address

Whilst investigating performance issues on one of our servers (Windows Server 2012) I noticed that the connection with by far the most traffic is to an ipv6 address (ac19:8020::). But according to ...
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22 views

Server on CentOS [closed]

I'm trying to mount a server on Centos 6 (64 bit). The server (of a game I used to play) consist on several Servers related one to each other. Basically the possible config of each server is it's own ...
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1answer
26 views

Providing master_ipv4_cidr_block and subnet range using terraform variables in GCP

I have created a private cluster in GCP using terraform modules. As per the documentation here: https://www.terraform.io/docs/providers/google/r/container_cluster.html#master_ipv4_cidr_block, I have ...
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1answer
31 views

How to configure multiple network cards

I have two network cards in my server. One network card is connected to internal network, which I am using for ssh connection and for access to other servers, but I am not able to access to the ...
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21 views

Isolate Docker Container and Virtualbox VM

I'm searching a methodology to add Virtualbox VM and Docker Container in the same address space. I'll explain better, i'm using Vagrant to create a Docker Container and some Virtualbox VM, they use a ...
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Ubuntu LAMP server suddenly refuses connections

I'll start off with the setup: Ubuntu 18.04 Server with LAMP Stack with WordPress VM in a Proxmox 5 Hypervisor 1 OB 1Gb NIC (pve Gui) 3 TPLINK 1Gb NIC 1 quad port Intel NIC Domain hosted through ...
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23 views

How to redirect HTTPS traffic to a proxy on localhost:443?

I'm building an HTTP server in C++ using the Cesanta Mongoose c++ networking library. Essentially I'm trying to redirect traffic from my web browser to a proxy on the localhost. I recently added ...
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7 views

Fluctuating Throughput on Single Thread HTTP Connections (Nginx/Linux)

We are having some issues with fluctuating (unstable) throughput with a single stream HTTP download from an Nginx server on Linux. We find that a single HTTP thread produces unstable throughput with ...
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Any app or method to use cell phone as a gateway to a closed WiFi network?

Scenario: I've messed up my firewall rules at home, and then I jumped on a plane! When the family connect to WiFi, they cannot get out to the Internet. Its impossible to get in from outside, or out ...
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1answer
19 views

Fedora network configuration

I've got a Fedora 31 instance configured with an IPv6 stack and that has join an IPA domain. I've activated the IPv6 stack by editing /etc/sysconfig/network-scripts/ifcfg-eth0 Added IPV6INIT=yes ...
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25 views

Do I still need a separate router?

For small businesses I am used to the following paradigm. You get a all in one modem/router/wireless access point from a your cable company. Now, if I need more devices, or want to upgrade my system,...
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53 views

Kubernetes CNI Hairpin Traffic

I setup a Kubernetes cluster using Kubernetes the Hard Way tutorial, and the connection is hanging whenever a Pod connects to another Pod on the same node through a ClusterIP (hairpin traffic). If I ...
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37 views

System-wide proxy that blocks certain requests

I'm looking to set up an HTTPS proxy on my server that blocks all outgoing traffic to a certain domain except for GET requests. For example, lets say my server has a Ruby on Rails app, a bunch of ...
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9 views

multiple socksproxies bridged to vpn tunnel

I've bought vpn access from a vpn provider. I'm able to have 5 concurrent vpn sessions within the subscription. I'm trying to do following setup: 1..n socks-proxy -> 1..n openvpn client tunnels to (...
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9 views

How to network containers (LXC/docker) on a linux host so that traffic goes through connected router?

I am looking for a solution that doesn't involve network namespace isolation. Is there a way to ping containers (C1->C2) in same global namespace and avoid linux host bridging/routing, so that it goes ...
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2answers
43 views

Windows Server 2016: No network cable detected after reboot

we recently made the 'mistake' to reboot one of our servers (INTEL Server Barebone R2312WFTZS S2600WFT). All went fine but after the system was up and running we could not connect via network. ...
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1answer
29 views

Getting the Network Credentials of a running process?

If a Windows program is run with ‘runas’ using the ‘/netonly’ argument is there any way to see what credentials are being used by it for the network? Similar to the way you might see a process is ...
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25 views

Cesanta Mongoose - problems connecting to localhost

I'm having issues building an HTTP server using the Cesanta Mongoose web server library (not the node.js Mongoose). The issue that I'm having occurs when I have an HTTP server built to listen on port ...
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0answers
29 views

Active ssh connections drop after 120 seconds [closed]

On my home network, I have a wireless access point (a BT Business Smart Hub), which I use to connect to the wired network via a separate router. ssh super 'count=0; while true ; do echo "$count : $(...
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61 views

Docker-compose exposing port when reusing network

I am trying to get a set of containers to work together with a OpenVPN-client. I used this as a template and build my own container (on a Raspberry Pi, so i cannot use the prebuilt image right away). ...
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1answer
30 views

One time password sharing over local network [closed]

I am responsible for the security of a company where passwords are currently stored locally with a password manager, but if another employee needs a password, they are shared via cloud based programs ...
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1answer
51 views

Subnet and VLAN addressing in a Datacenter

I am trying to learn Datacenter networking and I am finding it hard to understand best practices for IP Address and VLAN assignment to servers and racks. For my question, I'll assume a typical 3 ...
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58 views

SYNPROXY not working?

I have a firewall looking something like this: # Kernel settings sysctl -w kernel.printk="4 4 1 7 " sysctl -w kernel.panic=10 sysctl -w kernel.sysrq=0 sysctl -w kernel.shmmax=4294967296 sysctl -w ...
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1answer
43 views

How do I route traffic through another server?

I have two linux (Ubuntu) servers, A and B. Server A has access to the internet, B does not. The servers can communicate with each other via their respective (separate) default gateways. I can access ...
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1answer
23 views

IPS and IDS in Windows Server 2008 [closed]

Can anybody tell me how can I implement IPS and IDS (Intrusion prevention system, Intrusion detection system). I am using Windows Server 2008 R2 and Windows Server 2012.
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1answer
57 views

Server not reachable after setting static IP

I am doing experiments with a Debian 10 VM on my PC. Everything worked well until i tried to setup a static IP. The static IP is working now, and i am able to ping and traceroute to e.g. google.com ...
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Data exchange on layer 2 devices happens using MAC addresses. Then why ports must have to be configured with IP addresses?

As we know that the Data exchange on layer 2 devices occur using MAC addresses. Then why ports have to be configured with IP addresses? Thanks in advance.
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OpenVPN clients getting DHCP lease from external server, despite server-bridge used with an DHCP pool

I have an OpenVPN sever and several clients. My issue is that although I specify a pool for DHCP leases with server-bridge, my clients get a lease from that, but then eventually (after some minutes to ...
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1answer
23 views

How to connect a GigE camera directly to a computer? [closed]

We have a GigE camera attached to our network, capturiung images from a Python program and processing them for a computer vision task. The camera receives its IP address from our DHCP server, as usual,...
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1answer
49 views

Cisco switch inter-vlan port

expertise my question is : i take 2 l2 switch(s1 and s2) 2960. s1 port 1 is an vlan 10 and s2 port 1 is an vlan 20 and both switch is connect through access mode via 24 port of s1 and s2, vlan for s1 ...
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1answer
61 views

Master ipv4 CIDR configuration for private cluster in GCP

I'm trying to create a private cluster in GCP as per the steps mentioned here: https://cloud.google.com/kubernetes-engine/docs/how-to/private-clusters As per this, the ipv4 address for the master ...
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0answers
31 views

List active sessions from tun interface

I'm running CentOS and have a tun interface with IP subnet 10.0.0.0/24 attached for "users". Is it possible to list current active sessions with netstat, ss or similar? Ex. netstat something: tun-...
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33 views

Multiple Public IPs, VPN using Ubuntu 18.04

I am attempting to configure a tricky sort of traffic handling node. I'd like to have a node receive traffic over a VPN connection on one NIC, then NAT them out to the internet over a second NIC. I'm ...
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1answer
12 views

Opensense - Uses route but is directly connected

I have the following configuration: Network Architecture Router 1 (192.168.5.1/28) with Network 192.168.1.0/24 (Opensense) Router 2 (192.168.5.2/28) with Network 192.168.2.0/24 (PfSense) Server 192....