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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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Is it reasonable to put all printers to another subnet?

I have a network of about 90 PCs and about 25 network printers. In near future i will promote one server to DC. However, now PCs on my network have static IP addresses. It is a real mess now with IP addresses. Printers are not statically assigned…
ysakiyev
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In what scenarios would a VLAN not align 1:1 with a subnet?

Under what scenarios would a VLAN not align with a subnet. I've been told that genearlly they always go 1 to 1. What are some examples or scenarios, and reasons for anything besides that, and for what benefits or losses?
user117197
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How ISPs will assign IPs /subnets for end users in IPv6

Consider two scenarios: The end user has a simple computer, dual-stack The end user has a LAN behind a dual-stack router How will ISPs differentiate each one of these kind of users in IPv6? An user in scenario (1) would receive a single IP,…
Filipe Rodrigues
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/32 subnets on Ethernet via DHCP

Is it possible to assign to an ethernet host via DHCP a subnet mask of only the host itself, e.g. 192.168.1.123/32? Do common operating systems support this kind of configuration? I'd like for the hosts to send all of their traffic to the router…
lxgr
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Wake on LAN over different subnets

I have 3 IP blocks and 3 Cisco Switches. Each switch has its own IP block - 10.45.100.0/24, 10.45.101.0/24 and 10.45.102.0/24 I have got a PC on 10.45.100.0/24 block. I can wake up whole computers (with IP Address, Mac Address, Subnet, Port) in this…
İbrahim Akgün
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How can we explain CIDR notation with /24 and /32 to a manager?

Update: I seem to get two kinds of answers and I need to get more clarity on how they relate (or not). What we have so far is, roughly in the lines of: you have 32 bits, the / indicates how you split it and (or versus) You have an address, the /…
Dennis Jaheruddin
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Systemd's Networkd: Unable to add ipv6 default route

I am having a hell of a time getting IPv6 address connectivity set up on my new VPS. I thought I knew what I was doing but apparently networkd disagrees, I keep getting issues when trying to add a default route. Here is the networking information…
Foxie The Yiffer
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IPv6 subnetting a dynamic /56 prefix

I read How does IPv6 subnetting work and how does it differ from IPv4 subnetting? but my question was not answered there. I'm upgrading our IPv4 network to IPv6. Currently, our NAT gateway splits our one IPv4 address into 2 private subnets, our main…
Old Pro
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mount.nfs: assigning subnets in /etc/export is not working

I have installed nfs-server on centos and edited my /etc/exports as follows /data 10.25.0.0/25(rw,sync,no_root_squash). when I try to connect from my client with ip address 10.25.44.144, the connection is refused. but when I edit /etc/exports with…
brain storm
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How do I set up routing for a VPN gateway separate from my main gateway?

I have a run of the mill router/firewall set up for my small company's Internet access. I've also added a separate VPN (IPSec) gateway using a Netgear VPN router. The main gateway and VPN gateway have separate public IP addresses, and the VPN…
user640
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unable to ping or ssh between aws vpc subnets

I have a fairly standard multi-tier subnet layout in VPC. There is a database tier/subnet, a web server tier/subnet and a bastion host tier/subnet. My problem is that I cannot ping or ssh between subnets. In particular I would like to ping and ssh…
rriehle
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How to let chef listen on multiple IPs

I'm currently playing with chef to evaluate whether or not such a configuration tool might help us in our *nix-based environment. For the last few days I'm struggling with one problem I can't find a solution for. Basically, I have 2 private network…
Kenneth K.
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OpenVPN Access Server: Remote Subnet Cannot Access Client's Resources

I have OpenVPN Access Server running on AWS. Here's the configuration: 172.18.16.0/20 Client (172.18.16.101) ----- OpenVPN Server (172.16.0.0/20) | | …
keerati
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Why is my AWS instance's private IP outside of the subnet's range?

I'm trying to launch an instance with the private IP address 172.31.32.101 using Terraform in my default VPC (CIDR 172.31.0.0/16), in the eu-west-1a subnet that has the CIDR 172.31.32.0/20. I can usually do this with no problem, but more and more I…
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Pacemaker ocf:heartbeat:IPaddr on different subnets

I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some help. I have two VMs on 200.xx.xxx.9 and…
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