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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VM inside an Esxi host does not have Internet access

I have installed an ESXi 6.7 host inside a VMware Workstation. That ESXi has one VM Ubuntu 20 server running. But that VM does not have internet access. Here are the network settings: ESXi host is ...
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Rest api call taking 50 seconds on the client's server, but on ours it takes milliseconds

We have a lamp stack. In our office, the code is deployed on a centos 6, we get a response after 1612ms and everything is good. We deploy the code to our client who's using centos 7. Postman response ...
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Azure: whats the difference between “basic” and “standard” SKU for public IP, and which should I Chose?

to create a public IP for a server, so it can "see" the outside world, and so I can SSH to it, I need to create a static ip. This can be "standard" or "Basic". What is ...
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Azure: whats the difference between “Reserved IP Address” and “Public IP Address”

Whats the difference between these two resource types, and which should I create? My scenario is I need to setup an unknown number of jmeter load test servers (which will be linux VMs which I manually ...
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Raspberry as network gateway [closed]

I'm trying to setup a mini gateway with a Raspberry connected to a DSL Router and an Android Hotspot. Here is the schema: network I have a network 192.168.178.0/24 on the DSL router I have a network ...
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2answers
29 views

Identifying a connection after SNAT

Hi I have a problem statement that I am trying to solve from quite a while now. Problem Statement (This is a networking scenario): Machine A and Machine B want to connect to Machine D, Machine C being ...
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1answer
22 views

Cannot connect to VPN server

I'm running ubuntu linux on which I try to connect to openvpn server. I tried network gui and also connect from command line, but I always get this error: /sbin/ip route add 10.0.8.9/32 via 192.168.8....
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1answer
24 views

aws - can I configure ip allow rules for a specific endpoint

My Config is a single EC2 instance. I'm new to aws and inherited this architecture. We want to create an endpoint that will be accessible only from the office (specific IP). What is the best way to ...
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Cannot set MTU for Network interface in FreeNAS-11.3-U3.2 Web Interface

I'm trying to set the MTU value for my network interface in FreeNAS-11.3-U3.2 to 9000. However, when I select the interface to EDIT in the WebUI, enter 9000 for the MTU field, then click "APPLY&...
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1answer
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why linux host do not contain ip after add bridge network with kvm virtual machine [closed]

After I join the bridge network br0 in my Fedora 32 workstation machine, my host machine config look like this using ifconfig: [dolphin@MiWiFi-R4CM-srv .ssh]$ ifconfig br0: flags=4163<UP,BROADCAST,...
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Can't connect to SSH on private IP through VPN gateway [closed]

Morning, everyone, I've been having a strange problem for a few hours. I was SSH connected on my Azure virtual machine and my SSH connection suddenly froze (without disconnecting). I closed my shell ...
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VLAN 'Bridging' for Core on Multiple Networks

I think I have a very unique use-case that I need help with since I am not a network engineer. Here's the layout. I help operate a gaming floor network for a Casino. The thing that I noticed right ...
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28 views

2. Consider a network 192.168.0.0/24. Specify the 04 subnetworks of the aforementioned network with complete details of each network

Consider a network 192.168.0.0/24. Specify the 04 subnetworks of the aforementioned network with complete details of each network
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1answer
77 views

How to treat broadcast ip address as a normal IP

I'm new to networking things. I have a sub-network with 16 IPs (ex: 1.2.3.0 to 1.2.3.15). I'm using lxc for each IP for different purposes, but currently the containers with IP 1.2.3.0 and 1.2.3.15 ...
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Debian 10 and Intel I350 - Interfaces disabled after boot

I have a server with an Intel i350 quad nic on the motherboard (SuperMicro X9DRi-LN4F+). This server ran in production for many years no problems (Debian 9). Recently, I moved the server to a new ...
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VMware ESXi not using IPv6 addresses assigned by DHCPv6

I'm running a hypervisor with ESXi 6.7 Update 3. I have it set to receive IPv6 addresses using DHCPv6. Though it is soliciting addresses with DHCPv6, it's only using its autoconfigured (SLAAC) ...
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33 views

CentOS 8 network on boot

I'm running CentOS 8, every time I reboot the network does not start until I log in to the system. I've checked the NetworkManager and the autoconnect is set to yes. connection.autoconnect: ...
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When an IP is GOOD or BAD boy - a research aproach [closed]

good old times those in which every computer/organization had its own, almost proprietary IP, and by its own IP you could know if it was one of the good allies, or one of the malignius IPs used by the ...
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Azure Traditional Load Balancer VS Azure Application Gateway response latency?

Environment Details: I have an application hosted in two azure environments for two clients. The application contains ASP.NET web API backend and Angular Frontend. Both applications hosted on two web ...
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2answers
37 views

Is there a tool or method to see if a Windows DNS server is answering DNS requests from clients?

I need to decommission a 2008 server that was one of 4 DC's in the domain within the same subnet/site location. I was able to decom 2 others without issue for the most part but the last one I did ...
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1answer
39 views

Corruption using linux traffic control (tc command)

I am kinda new to doing traffic control using Linux tc commands. So i am doing some hands-on on introducing network delay, packet loss and corruption etc across two hosts in the same network. The ...
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27 views

Respond to incoming connections with VPN while sending outgoing traffic to normal gateway

My server is running on a network where port forwarding is blocked. To get around this, I have connected it to a WireGuard VPN running on a small AWS instance so that I can have a dedicated IP. The ...
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Kubernets-Cluster communication fails when spanning across class B and C networks

Our production cluster is running fine on k8s 1.12.3-rancher1-1 having several nodes in two different networks: 192.168.225.0/24 (2) and 172.30.0.0/24 (6). When upgrading the cluster to any newer ...
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2answers
25 views

use nethogs in a script

nethogs is a great utility to monitor network traffic by process. However, it is "interactive" and not suitable to be used in script... How can I achieve the following using nethogs or ...
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51 views

TCP: connect to [AF_INET] failed: Unknown error

I am trying to connect my computer to a OpenVPN server setup on a desktop. I am getting an error: TCP: connect to [AF_INET]<IP>:<Port> failed: Unknown error Where <IP> is the IP of ...
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20 views

Windows Server 2003 SP3: “the specified network name is no longer available”

I have a network, where the Active Directory Domain Controllers run Windows Server 2019. We have an old SharePoint server running Windows Server 2003 SP2 running as a virtual machine on an old ...
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Using linux to access resources through windows machine [closed]

I have a windows 10 machine already set up to have access to some resources (various domains and subdomains) based on the machines ip (and probably other network stuff). Then, on the same network I ...
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2answers
174 views

How to Handle Sudden Burst in New HTTPS Connections?

I've got a fleet of Java Vertx servers behind a load balancer that handles spikey traffic. One minute it may be handling 150k r/m, the next it may be handling 2mm r/m, then right back down to 150k r/m....
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3answers
44 views

Sending files via FTP without IP addresses on PC's [closed]

Can two PC's communicate with each other - FTP, without using IP addresses(entirely skipping Network Layer)? I know, FTP is client-server architecture, but I wonder if LAN network and MAC addresses ...
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35 views

nginx connect() failed (111: Connection refused) while connecting to upstream [Mastodon]

I am setting up a Mastodon server on Docker on Ubuntu. The server is up and running but when I try to access the site from a browser I get the error 502 Bad Gateway. I have checked that ufw is ...
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libvirt on fedora, qemu/kvm guest, guest can ssh to host, but failed to samba or ftp to host [duplicate]

I am running libvirt/qemu-kvm on Fedora32, guest OS is win10 with spice-guest-tool in use. I use 'nat' mode virtual networking. root@fedora ~]# virsh net-dumpxml default <network connections='1'>...
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Windows 10 won't connect to WiFi after changing subnet [closed]

After changing a Ubiquiti Aircube router's subnet, (router IP, DHCP range etc), windows 10 simply refuses to connect to the WiFi. Phones and tablets are just fine. I've tried ipconfig /renew, ...
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Computer getting Unable to Identify Network UNLESS Vlan is changed

Question moved from Network Engineering to Server Fault. This is a problem that has long plagued this environment. At seemingly random times (measured generally in months), a computer may suddenly ...
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28 views

could not access internet from kvm virtual machine using bridge network

I am configure some kvm virtual mahine in my fedora 32, and the virtual machine using bridge network, this is the bridge network configuaration in my host machine: [dolphin@MiWiFi-R4CM-srv network-...
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27 views

How do I configure my Linux eth interfaces correctly?

This subject drives me crazy. No matter what instructions I follow on the Internet. It only generates problems. I want to configure my eth0 interface for IPv4 and IPv6 for a static IP on Debian Buster....
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20 views

Having multiple OpenVPN connections on multiple interfaces on Linux

i'm trying to have 3 OpenVPN connections up at the same time to be used with curl and the --interface command line option. First thing i did is adding the pull-filter ignore redirect-gateway option to ...
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0answers
12 views

Force a protocol or fqdn suffix to always use cellular [closed]

I cannot connect to Azure SQL (port 1433, FQDN suffix *.database.windows.net) over my usual WiFi due to outgoing port restrictions (also probably other Azure services but I haven't investigated ...
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1answer
47 views

No route to DNS server from Docker container

Even though I can successfully ping a host from a Docker container (i.e. docker run busybox ping -c 1 216.58.207.206), requests involving a DNS lookup result in a timeout (e.g. docker run nslookup ...
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0answers
39 views

Creating a isolated private network for security and privacy [closed]

Below is the general idea. I have a main router that I want to be isolated from. I bought a TP-Link TL-WR700n Pocket Router to be a able to accomplish this. A different router,the TP-Link TL-WR802N, ...
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0answers
16 views

Access to VPN network through proxy windows server

I have a Windows server in the cloud which connects to a VPN. I would like connect my local computer to that VPN. I can not connect to the VPN directly due to geographical restrictions and the only ...
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1answer
37 views

Converted to firewalld and Now “No route to host” Error Between Subnets in a Zone

I have a router running Debian 10 that I have been using for years. Yesterday I decided to convert from iptables to firewalld because I needed to beef up my security and support some new networks in ...
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2answers
22 views

Could servers with different net-ids be in the same VLAN [closed]

Could I theoretically have one server with an ip address of : 10.10.10.1 and another server with the ip : 10.10.11.2. sign them the same vlan id on the switch, and have communication between them (say ...
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0answers
8 views

finger service not getting enabled in my router(cisco packet tracer)

i tried enabling 'ip finger' command in my router, but it isnt' working, someone please help Router#config terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#ip ...
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1answer
27 views

nginx acessible from localhost but not from private ip

I'm trying to expose an ubuntu computer to my local network to host a website. After installing Nginx, and configuring ufw to open ports. I configured Nginx with the following: http{ server{ ...
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11 views

Can we open a small java for Android server under the 4g/3g network? [closed]

I coded an app to host a server on a phone, this is working perfectly on the private network and the internet by setting up port forwarding. But when I use mobile data, the server doesn't start. I don'...
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40 views

Cisco cannot access public IP from within lan

I recently set up a very basic cisco setup. Everything works and if I'm on another network i can access my public ip however I cannot access my own public IP when I'm on the LAN. I'm using a very ...
2
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1answer
115 views

Bridging two (a physical ethernet with a virtual ethernet) different subnets on linux?

I am thinking if it's possible to create a bridge while allowing each bridged network to exist in it's own subnet. Network 1 - Say, I have a physical ethernet based network eth01 - with subnet 192....
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1answer
43 views

Network Load Balancer for multiple Subnet IPs

Can we do network load balancing among servers with different subnet IPs present in a LAN. Basically I have my website on these 2 servers and website name is mapped to a Virtual IP. What type of load ...
0
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1answer
63 views

How does a web browser parse the raw bytes of each part of a DNS name to a human readable form? [closed]

My focus is to parse the structure of a DNS packet programmatically using python. Consider the snap where my browser send a large domain name through the pipe without even complaining. Let's take a ...
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0answers
32 views

Allow outgoing http requests through reverse proxy server with docker and iptables [closed]

I have a running setup with docker and several containers : a reverse proxy nginx server, on docker-network A an nginx webserver, on docker-network A and B a nextcloud container on docker-network B a ...

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