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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Linux Wireguard Routing / Connectivity Issue

I am trying to setup a Wireguard VPN server so that a single peer can connect and access the network on which the VPN server resides, but also so that servers on the network can access the peer that ...
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how to connect 3 servers under two private networks

server2 (10.0.0.2) <--> **server1** <--> server3 (10.0.1.3) output in server1. netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window ...
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Sending traffic from an interface to another server

I have traffic (TCP) coming to a network interface on an Ubuntu server. I would like to send all that incoming traffic to another server, i. e. to its IP address. Nothing else is required (i.e. ...
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VirtualBox Ubuntu VM (Windows host) stops resolving names after connecting to VPN on host

I am running a Lubuntu guest VM on my Windows 10 host using VirtualBox (6.0.10r132072). Everything works fine network wise. When I connect to my company VPN, in most cases the VM loses ability to ...
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Installing kubernetes on Ubuntu 16.04 and 19.10 kills network connectivity

Following these steps to install kubernetes on Ubuntu 19.10 running in VMWare player with bridged networking. Installing kubernetes destroys the network connectivity of my guest OS. Specifically it is ...
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Cannot access to Kubernetes NodePort from other worker nodes except the pod's one

I'm managing a standalone kubernetes (v 1.17.2) cluster installed on CentOS 7 with single API server and two worker nodes for pods. One of the services is configured as a node port service however, I ...
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Routing traffic on a single machine through various portals? [closed]

does anyone know a way to rout traffic, from a single machine, through a variety of portals (maybe VPN's or something) so that, in effect, a single machine has an arbitrary number of IP's active ...
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How to create port based proxy server in a VPS?

I want to create a proxy server that can be accessed with IP:port, I tried squid and able to create only one proxy but I need as many possible proxies using one IP like this. Basically I need one IP ...
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iptables port forward not working with libvirtd VM

For some reason, I'm unable to connect to my server inside a VM from the outside world, but I can definitely connect to my server from the hypervisor. The server application runs on ports 27500 and ...
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How do you configure access lists to restrict inbound ports while allowing all outbound traffic on a Cisco 2911 router with NAT?

First caveat: I did not design this network. Most of my recent networking experience is with ASAs; configuring NAT & ACLs there is pretty easy and straightforward. In this case, the engineer who ...
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Advice: 10Gb SFP+ switch 3 node Windows Server 2016 failover cluster, hyper-v [closed]

Need advice on 2 refurbished/used 10Gb switches for use in 3-node Windows Server 2016, HA Failover Cluster, Hyper-V There are 25-30 Hyper-V VMs running various versions of Windows Server, (SQL Server ...
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Packets not getting forwarded on Centos7 between GRE tunnels

I'm have configured GRE tunnels between centos machines and corresponding routing tables on individual centos machines as shown in the image: I dont have enough reputation to post images Router1-----...
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Using IPv6 Addresses only

Technically, is it possible to configure a Google Compute or AWS instance with only an IPv6 external IP address? I am using the instance as a web server. Given today's situation, what percentage of ...
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Troubleshooting hosts and guests ping issue

I have 2 physical machines: host1 and host2, hosting KVM systems. Every system (host and guest) has its own IPv4, and is reachable from any computer or network. Although they are not connected I ...
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How to connect to VM on Qemu which uses -device option with fixed mac address?

I found a script that starts qemu with this option: -device e1000-82545em,netdev=net0,id=net0,mac=52:54:00:c9:18:27 \ how do I connect to this machine? I want to SSH into it. I tried seeing the IP ...
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How can I pass DHCP request via router from ESXI virtual switch?

I have 3 servers PFSENSE server which has 4 interfaces: WAN LAN – 10.0.0.0/24 Servers (vlan) - 10.0.1.0/24, VLAN tag 1 DMZ (vlan) - 192.168.1.1/24, VLAN tag 2 ESXI server which has 1 NIC and ...
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Loop do until fails after exception

do { Try{ if (New-Object System.Net.Sockets.TCPClient -ArgumentList $server,3389 ) { Write-Host $server 'Ready for RDP connection'-ForegroundColor Green } } catch { write-warning $error[0] } }...
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DHCP-policy for RRAS-VPN

I did set up a RRAS-VPN-Server for our network. It works almost fine. The only thing missing is that I want to create a policy on DHCP that can be used to communicate special options to the VPN-...
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Change the destination IP of packet encapsulated by GRE in Linux?

I have two Linux servers with a GRE tunnel connecting the two; traffic flows from one network, forwarded via MARK iptables and ip route rules in iproute2 (/sbin/ip), to the other for monitoring and ...
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Intermittent external connection with RHEL 7 servers

I am trying to work through an issue where several RHEL 7 web servers (Tomcat 8.5) are experiencing intermittent connection issues outside of our network. The servers are setup to be accessed from a ...
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Can you statically route to a subnet-conflicting (but not IP-conflicting) device on WAN side of a router?

As the title suggests, I have a weird question. We had an ISP technician at a customer's home install a router in front of our own router and misconfigured it. The ISP router is now in front of ours ...
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alias: Host name lookup failure on adding address to interface

I want to port forward multiple MySql databases via ssh like this: ssh \ -L 3307:database-1:3306 \ -L 3308:database-2:3306 \ bastion-server I also want to acces databases locally via database-...
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Different source IPs when connecting to AWS instances in same AZ

When connecting to my AWS instances in the same AZ, I am able to connect to some instances and not others even though all instances were using the same NACL an Security Groups. My security groups ...
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Get current username inside proxy.pac

Is it possible to get the current username of the environment the proxy.pac file is running in? (ie, on Windows desktop, the current logged in user). We have a new proxy that I want to direct certain ...
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Windows Server 2019 - Hyper-V: 1NIC for server, 1 NIC for VMs

and thanks for reading! I have always been dabbling with networks and I am (very slowly) starting to understand them. I have at work a windows server 2019 which I am using to understand how networking ...
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NGINX (104: Connection reset by peer) while proxying and reading

hi all I have a problem with NGINX server this is the error that I`am receiving (104: Connection reset by peer) while proxying and reading from upstream, client: 192.168.88.173, server: 0.0.0.0:443, ...
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Restricting which ports accept connections (Debian 9 Stretch)

I am not a sysadmin but I am having to assume some duties in that realm. We have a Debian 9 Stretch server for development use. Linux xxxxxx 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u2 (2019-05-13) ...
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Looking for a Cluster Filesystem – with network seperation [closed]

Currently working on a project, it´s about files, which should be processed in an IP-based network. The nodes, which process the files, should not see each other in the network, there should be a ...
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vlan on esxi - no internet on VM [closed]

I have esxi server and can connect to it. after i am creating VM machine that machine cant connect to the network.
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Does anyone make universal, multi-outlet wall warts? [closed]

I'm trying to put my network hardware into a panel enclosure, like that pictured below. I've mounted a power strip along one side, and have mounted patch panel, switch, router, etc., on the plywood ...
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How do I get networking to work with an ubuntu VM from catalina (tried both virtual box and vmware fusion)? [closed]

it's been a few years since I've done any work with either Virtual Box or VMWare Fusion on this Mac Book Pro laptop, recently updated to run Catalina. With both hypervisors, and trying both Ubuntu 19....
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no network for new proxmox install [closed]

hi there I'm new to VM tools and I can't get proxmox to work can someone tell me how to set up the network I have looked around and found I need to use Sudo nano /etc/network/interfaces and edit ...
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Cannot open https://www.rba.gov.au from Windows 2012 [closed]

We have an application that downloads https://www.rba.gov.au/rss/rss-cb-exchange-rates.xml daily to get exchange rates. It stopped working a few days ago, we found that above URL doesn't open in IE ...
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Why/how does keepalived prevent local access to virtual ip?

I'm running a containerized (with podman) squid proxy on port 3128 on a pair of servers, using keepalived to share a virtual ip address between them. I've noticed some odd behavior that I can't figure ...
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i want to visualize myself about bandwidth of internet [closed]

as we know bandwidth is just a way through which data flows.20 Mbps internet means 20 mega bits per second and 40 Mbps means 40 mega bits per second.i guess 20 Mbps means 20 Mb of data is retrieved in ...
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Connecting my Netgear R6350 to Comcast 2-in-1 modem/router [closed]

My roommate insists on keeping the 2-in-1 modem/router in a cabinet so I want to connect my own router to boost the signal. I tried using it as both a router and a wireless access point. When I set it ...
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Subnet and IP Alias [closed]

Since my last question wasn't answered, I took a look at my configuration and I saw that all the IP addresses where xx.xxx.xxx.xx/32, but on my hostings Control Panel they were /28. So my question is :...
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Error while checking IPv6 address using Get-NetIpAddress

Get-NetIPAddress -AddressFamily IPv6 -AddressState Preferred -SuffixOrigin DHCP | Select IPAddress I am facing the error below while executing above script. It shows the correct IPv6 configurations ...
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Ping to an IP is successful but telnet to a Port with the IP result in `Host is unreachable`, what are possible reasons? [closed]

I have a host machine with linux system, and its LAN IP 192.168.0.94 on the host, there is port 8848 which is listening, so I can telnet to it: [root@host-machine ~]# telnet 192.168.0.94 8848 Trying ...
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Synology QuickConnect Relay: Not Secure?

I was reading the QuickConnect whitepaper and was overall pretty impressed. But on page 10 it explains how the Relay service works and it’s implied (but not explicitly stated) that packets are ...
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Client can't discover server (UDP)

I'm discovering network using UDP broadcast like https://stackoverflow.com/a/22853295/13117660. I have tried 4 different options. LAN Server/LAN Client LAN Server/WIFI Client WIFI Server/LAN Client ...
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How secure is SSTP EAP/MSCHAPv2?

how secure it SSTP via EAP-MSCHAPv2? My understanding is that SSTP uses certificates. I once configured it like that (I thought at least). Though I had the expirience that on a client without ...
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How to create a virtual network adapter on Windows Server 2019?

How can I create a virtual network adapter with DHCP on WinServer 2019? I already have one network adapter (not virtual) with DHCP-on, so I want a second NIC with different ip-address. I tried to ...
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Telnet issues between docker networks

in a host machine (its LAN ip is 192.168.0.94), I have the following services 1) mysql , its docker-compose.yml is as below. It creates a bridge network called mysql_default,it is assigned a VIP 172....
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How to find out the IPs of instances in Google Cloud Platform

I have two projects on GCP Project-A Project-B I have kubernetes cluster running on Project-A, whose nodes are autoscaled depending on usage. Hence there is no way of knowing (I guess) what IPs the ...
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1answer
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Are devices on the same VLAN considered on the same network segment? [closed]

Say you have two network segments connected by a router. In my previous question we found that the two network segments are not on the same network segment when connected by a router. Now say you put ...
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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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Why does `ping` succeed while telnet failed from inside a container residing in an docker overlay network?

I created an overlay network in a host and I start a container A in the overlay network. I start another container B which resides in a bridge network of the same host machine(the host machine is ...
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1answer
86 views

What do the following mean: TCP:RA, TCP:FA ,TCP:PA, TCP:S, TCP:SEC

I'm specifically looking for a definition of what the following mean: TCP:RA, TCP:FA ,TCP:PA, TCP:S, TCP:SEC The context is that I'm looking at some pfSense logs which are showing rejected packets by ...
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Ubiquiti UniFi UDM in the home [closed]

I'm what you might call a power user, and i'm currently using a LinkSys Velop (v1), which works ok, but i'd rather have something a little more configurable. So i've been looking at the UniFi UDM (...

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