Questions tagged [subnet]

A subnetwork, or subnet, is a logically visible subdivision of an IP network.

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Excel Formula to figure out number of bits in subnet mask

I would sincerely appreciate if you could help me.. I am so confused right now. I have tried to solve this for over 2 hours now, google isn't helping me Heres what my teacher gave me to complete on ...
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How do I know if two machines are on same LAN?

I am very poor with Computer Networks, even though I took class in my grad school. I keep forgetting about subnets and masks and what not! Currently, I am playing with Docker and Erlang and was ...
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How many subnets and hosts per subnet can you get from the network 172.31.0.0/19? [closed]

How many subnets and hosts per subnet can you get from the network 172.31.0.0/19?
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Unable to assign Subnet mask 255.255.255.255. The combination of IP and subnet mask is invalid

I am trying to set a subnet mask and IP address as below for Windows 2003 Server. Getting error as: The combination of IP and subnet mask is invalid. All of the bits in the host address portion of ...
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MikroTik Layer-3 communication between 2 hosts

Test question - mikrotik In MikroTik RouterOS, Layer-3 communication between 2 hosts can be achieved by using an address subnet. Which one of those "/29" "/30" "/31" "/32"? Why? I understand ...
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Additional Subnet IPs for Hyper-v VM- VSwitches

i recently bought a dedi server from hetzner to use with hyper-v VMs, for the first 6 additional IPs hyper-v worked fine with default(auto) Virtual switch, i just created VMs, attached unique mac ...
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how to split up network into two subnets with only one router

I have one router on my home network. This acts as the main WiFi access point for all devices, as well as being connected to a simple switch for my home lab. I would like to be able to isolate my home ...
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Home network 2 subnets

Network noob here. This is my current home network situation: So I have two ISPs, one VDSL the other over TV cable. Each one has a router with WiFi and an ethernet switch attached to it. Several ...
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What mask for a LAN with two routers / subnets?

I have a main-router connected to ISP and most devices connected to it. It has IP 192.168.0.1 and it's connected clients get IPs in range of 192.168.0.X A second-router connected to this one, will ...
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1answer
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Device discovery across subnets

I segmented my home network into 2 separate subnets LAN/IoT so that IoT devices cannot attack my PCs and smartphones if compromised. Personal devices get assigned IPs in the range 10.1.1.1 - 10.1.1....
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What does it mean to have a subnet mask /32?

I see in this question, the routing table has: 192.168.1.1/32 link#4 UCS 2 0 en0 openwrt.lan 46:94:fc:63:fc:7 UHLWIir 11 3610 en0 1200 ...
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How to configure router and devices for subnetting?

I am new to Subnetting a network so please bear with me. I understood all theory but not able to find any information or tutorials that can explain practical steps and configuration require to achieve ...
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Is it possible to reach a computer on a network with a static ip that doesn't belong to the subnet?

Let's say I have a router at 192.168.0.1. Let's say it's a /16, so it's routing for 192.168.x.x. I have a desktop on this network at 192.168.0.2. Let's say someone attaches a new system to the network ...
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Establishing Connection to Ethernet Switch

I am trying to configure a basic network for a LAN. The LAN consist of only devices and an Ethernet switch. The devices are using Ubuntu. To configure a basic network, the computers must be on the ...
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Is this a valid assignment (made by professor) about dividing hosts into two subnets?

I quote the assignment: "Consider an organization with 4000 hosts. Divide the hosts into two subnets containing 1000 and 3000 hosts. Choose network ID's and define the subnet masks so that the ...
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OpenVPN - can't connect to clients on a new subnet

I run a server with lots of clients connected to it via OpenVPN and the number of clients slowly grew until it reached over 255 a few days ago. When I was initially setting up the VPN, I had this in ...
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Assigning subnet IPs to OpenVPN clients in AWS

I have a working OpenVPN server installed on the EC2 instance inside my VPC. It's used to allow remote users to access services inside private subnet. It's been a sufficient solution so far but ...
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VirtualBox Guest OS gets IP address in different subnet range [duplicate]

I installed a Debian-based Linux distro on a virtual machine with VirtualBox on an iMac. The private IP of the iMac is in the subnet range of 192.168, where as the Guest OS' IP is in the subnet range ...
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Device category between router and firewall (subnetting but nothing more)

In our office building we are eight small independent offices. In the future we would like to share one internet connection. In order to make sure that we do not access the network of each others we ...
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How exactly is a subnet mask used when determining where to send a packet to?

If you have the subnet mask 255.255.255.0 and a class A IP address, the first octet specifies the network, the last is the individual host. So do the middle 2 octets specify the subnet? And this is ...
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1answer
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How to setup a virtual subnet?

Ubuntu 20.04 is installed on my machine. A network cable connect it to a network camera. I've installed three virtual machines via VirtualBox on it, one Windows XP and two Ubuntu 12.04. What I need is ...
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OpenWrt router acting just as a switch with another WAN from wifi client

I have here this networking problem I can't figure out. My situation is following: ADSL cable connection to WAN, provider's router/modem (some Zyxel), DHCP running, original firmware, not possible to ...
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Routing 2 subnets

I have the following network topology as on the bellow picture. Briefly: Router A is connected to the internet and has local IP of 192.168.1.1. It is also a DHCP and serves clients on LAN or WiFi. ...
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Connect two subnets via ISP switch

I have a wireless router connected to my ISP switch in my home and then a workstation connected to another port on the same switch. Can I somehow connect the two subnets or is that only in the hands ...
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Multi Wi-Fi Router Network Assigning IP Addresses Outside Subnet

As illustrated here, I have a home network with two 5G wifi routers. ROUTER A (the ARRIS Surfboard) is also the modem that has DHCP enabled and is the default gateway. ROUTER B (A NETGEAR R6700) has ...
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Change the gateway in a docker network

I'm trying to create multiple dockers (from the same image) and put them in a subnet where I can work with them as if they were many machines. version: "3" services: machine001: ...
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1answer
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Routing between different subnets with Hyper-V adapter

I have a Hyper-V server set up. I want to keep my virtual machines on a different subnet but give them internet connection and be able to access them from my main network. My host machine only has a ...
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Separate networks in rooms connected to one router

I have a problem to solve with network at my home. I have a central router with address 192.168.1.1 it assigns automatically addresses 192.168.1.* ( I cannot change that) In my room I would like to ...
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1answer
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Same subnet but invisible to eachother

I am trying to run an octopi server on the raspberry and connect to it with the laptop. I managed to get two devices (a raspberry pi 4 and a laptop) to be on the same subnet of a public wifi network ...
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Two TP-Link routers are connected

I have two TP-Link routers: one is connected to the ISP and the other's WAN is connected to one of my Ethernet ports (assigned IP from router1 192.168.1.200). Hosts in the second router (192.168.0.0/...
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Can someone tell me if there's anything wrong with this network configuration? + Multiple Public IP

Firstly, is there anything wrong with this configuration? Secondly, will subnetting the network help with performance? Also, my ISP provided 2 public IPs through a single cable line. Will it be of any ...
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Immediate implications of moving from 255.255.0.0 to 255.255.255.0 subnet mask?

We currently have a network setup like this: 10.1.0.0 with a subnet mask of 255.255.0.0. Nonetheless, the third octet was sorta/kinda used to identify the group of devices. Example: 10.1.1.0 - 10.1.1....
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which ip address to assign to “private” interfaces?

I have an equipment powered by a cortexA CPU on which I run linux: It has 5 network interfaces. One is actually an ethernet interface (eth0). The others are tun interfaces with which it communicates ...
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Is it advisable to use multiple addressing schemes on the same lan?

Is it advisable to use multiple private addressing schemes on the same lan to be able to tell them apart easily in tcpdump or similar? e.g., fw 10. dmz 172.16. wifi 192.168. Will this cause ...
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nwdiag of home lan, is it whack?

Are there problems I can avoid by subnetting differently? I'm setting up a modest home lan, and I want to know if I missed anything critical or if there's a simpler way to subnet with given ...
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1answer
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subnet mask ip address

I have a device having IP address 192.168.1.** and subnet 255.255.255.0 I access that device on my pc through web servers by entering IP address of that device on the browser. By mistake I changed its ...
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1answer
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IPv4 Subnetting - Finding IDs for specific subnets

I need to know how to calculate/find the network ID for a specific subnet. For example, if we need 1000 subnets and 35 usable hosts, how do I find the subnet ID for the 250th subnet? Also, how do I ...
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Computers cannot ping each other with attempt to create a large subnet

Total newbie question here. I have a regular Netgear router (COTS) that I am trying to configure to increase the number of LAN IP addresses. Typically, the LAN is setup as follows. IP Address: 192....
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Communicating and chrome-casting between different subnets

I have my networks set up as all wired connections (PCs, TVs, Chromecasts etc) are connected to our main router (just the standard one that our ISP gave us) with gateway 192.168.0.1 and subnet mask ...
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Why is my subnet mask 255.255.255.255?

I have a modem which used for internet broadband and I got an IP address in the 'A' class 10.x.x.x and have netmask 255.255.255.255. What does 255.255.255.255 mean exactly? When I try to sniff with ...
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How to configure internet for one 'super' router and four routers underneat

In our home we have one Ziggo (dutch cable internet provider) router and we are stuck with one unfortunately. However, as we have 4 households (appartements) that all should connect to this router, we ...
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1answer
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Why subnet prefix is required when setting up a static address with nmcli in Linux?

It's conceptual question. I understand why subnet masking is required to achieve correct addressing of packets on the net. However, I do not understand why NetworkManager needs to know the schema (/24)...
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1answer
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Cisco Packet Tracer error “Invalid IP for this subnet mask entered”

im using cisco packet tracer configuring pc ip and this error came out "Invalid IP for this subnet mask entered"
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1answer
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find CIDR and check if subent is valid

It's been a long time since i answered networking questions and i kind of forgot how to answer them. can someone explain me how to find the correct CIDR? Second question: I'm pretty sure the first and ...
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How can i configure my router wifi to be on the same network

Hello everyone at my job my boss ask me to configure four router to extend our networking for people (I work in center with a lot of people and activity) I manage to put every router working and ...
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How to block “inner” LAN interaction with “outer” LAN in a two-Router configuration?

there is a sub here How to create a separate subnet for wireless access?, which shows a solution for two isolated private networks but for that you need 3 routers. I would like to know if there is a ...
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Separated network for layer 2 and 3 with additional wifi routers possible?

I need help in setting up a second isolated network for IoT stuff (TV, Fridge...). I tried it with two wifi routers, but when I tested it, it was not isolated yet. For the test I had the main router ...
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1answer
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Subnet Device commication using consumer grade routers

My ISP requires the use of their router that i am not able to view or configure. As such, i am using my own router (Asus AC5300) as an unfortunate second NAT. I now need to add a second router and ...
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Can a second router connect via WAN to another Router and establish a second network? [duplicate]

Setup is: A main router, then a second router which connects from its WAN port to a LAN port of the main router. This second router's goal is to establish a separated network for guest devices. I ...
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1answer
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how does arp scanning cross the network layer?

I have the following setup in my network: cc:cc:cc:cc:cc:cc -------- 192.168.1.5/24 phone bb:bb:bb:bb:bb:bb (other networks and ...

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