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Questions tagged [subnet]

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

Subnetting provides a way to use the number of IPv4 addresses in an optimal way. The previous notation with classes caused a lot of IP's to remain. In the beginning this was not a problem, but these days IPv4 addresses have already depleted at the top level.

Source: wikipedia

Tutorial on subnetting

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how to communicate in typical router switch router scenario?

I'm learning routing using packet tracer simulation and I think this is a very commun scenario: let's say pc4 is the server... why I can't ping from PC1 to 192.168.2.253 (router1) but I can ping 192.168.2.2 (pc0) aren't they the same subnet? what…
Yichaoz
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Packets dropped due to NAT? Firewall? Unroutable private IP addresses?

Preliminary note This question is out of academic interest. I know how to work around the limitation. I use this setup to control access from one subnet to the other on IP level which works great so I don't need any 'solution' or alternative setup -…
pong
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Windows 2008 R2 DHCP for two scope on two interfaces

I'm setting up a brand new DHCP Server over Windows 2008 R2 Standard edition server, and I'm planning to serv two differents lan with this one. Here is my configuration: 1 AD/DNS/DHCP Server with following ETH setup: ETH0 = PROD_SERVERS_LAN =…
Dr I
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Two machines on same subnet cannot connect to each other

I live in an apartment which provides the internet connection (isp: webpass). In one wall socket, I plugged in a router, which serves all my machines in the living room. In my bedroom I have another machine plugged directly into the wall. The…
Razor Storm
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Is there a tool for subnetting for free?

I'd like a program that I can write in an IP address and give it the Subnet mask and have it divide the networks in C level networks. Thanks. Something that I can download please, not a website.
Sergio Tapia
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Windows Server with two NICs with cross communication between the two with DMZ

Network Topology I have a Windows Server that is connected to a modem with a public ip address of 42.251.46.174 which is in DMZ that we will call Modem1. I then have a modem with the public ip address of 93.184.216.34 with a local ip address of…
Stephanie Schneider
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Internet reachable from the first subnet, not from the second, on same NIC

Hi (I hope this a the right place) I'm working on ubuntu 18.04 with ifupdown (/etc/network/interfaces etc.), not netplan. I'm trying for several days on this difficulty. one PC (A) with 2 cards : enp4s0 linked to my FAI (Internet 192.168.100.254)…
romaillard
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computer get dhcp from windows server dhcp server that is in other subnet

i have server with windows server 2019 with dhcp server role installed i'v created this scope: 192.168.9.1 - 192.168.9.10 with subnet 255.255.0.0 also i'v created a virtual lan card with this ip: 192.168.70.1 / 255.255.255.0 for hyper-v screenshot:…
mikuzan
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List all active devices in different subnets?

My company has a class A network that contains various subnets. I need to automate a way to produce a list of all online devices (in all the subnets). To start, just a list of responsive private IPs would be great. I like using arp-scan which is…
Andrew Campi
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Configure new routing and run DHCP server in router to access internet

SO I am a beginner network professional , I was sent to do a routing in client location so they can access the internet .The routing was supposed to be done on cisco 3900 series router. the following info were provided to me. • WAN V4 address range…
biplab
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Access VPN subnet from another PC in local(another) subnet

I have two PC in local subnet (192.168.0.0). One of them have connected through VPN to another subnet(10.0.0.0). [192.168.0.0] | - - PC1 | - - PC2 - - vpn - - [10.0.0.0] Router -- [Internet] Is there any way to get access to [10...] subnet for PC1…
AxaZol
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Separating networks with limited access between

I am trying to understand networks better and to help me learn I am working on a home project where I want to setup two networks, let's call them Client and Server, on the same geographic location. (Both networks get Internet from one single WAN,…
megahertz
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How many subnets are best practice?

What is the general best practice for subnetting a small (abt 15 servers) network of vms and physical machines? How granular should it be? Do you want to have a logical subnet or vlan for every seperate function in the network? What is generally the…
CorinaLarksExtraMild
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How to access second subnet that has IP cameras but don't want them to have access to the internet

My setup is: Internet modem/router with IP range of 192.168.0.X Debian PC's and Android tablets are connected to that via Ethernet cabling or Wifi. NVR with 16 cameras. The NVR has an IP address of 192.168.0.60 and it's possible to connect from the…
Kiwi
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Are Subnets Truly Secure?

Subnets are managed at the VM level. A compromised VM can change it's subnet to loop through all the possibilities. By their very nature, surely they cannot be considered secure? Note: I'm not a networking guru - so I may have missed something…
Michael Cropper
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