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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 forward all traffic and IP addresses

I want to build a system that allows me to have "floating IPs". To do this, I want to have a single server with 5 IP addresses. It then relays that traffic to another machine (or more) that contains 4 VPSes. This second machine only has one real…
user3413723
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How can I create two different subnets for 2.4 and 5GHz WiFi, and maintain communication between them?

I have two routers that are interconnected via Cat5 cable: a TP-Link Archer C7 and an old Netgear V7610. I am trying to create two subnets on the same LAN, and maintain communication between all nodes, regardless of which router they're connected…
Kenny83
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CentOS 7 - Cannot change subnet mask

I just noticed that this CentOS 7 server's subnet mask is 255.255.255.0. It should be 255.255.255.240. # ip a show ens32 | grep ens32 3: ens32: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 inet…
Nedry
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BrotherDCP-9045CDN scan to subnetwork

I'm trying to set up a BrotherDCP-9045CDN which is shared between 2 network (See Accessing printer from another subnet for the network topology). The printer and scan functions are accessible from both networks (only through IP from 192.168.1.XX…
user32210
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VMWare Workstation VLAN - Vyatta routers not able to ping each other

I have two routers configure to be within the same VLAN - LAN 2 https://i.stack.imgur.com/Wo1KR.png https://i.stack.imgur.com/qnDtQ.png And here are the network configurations: Router 1: https://i.stack.imgur.com/p0P7Z.png Router…
Grady Phillips
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Is it possible to create a new network on a LAN with another router?

I have a main router (Zyxel XMG3927-B50A) in my house that is a gateway on 192.168.1.1 connected to the WAN and I have another router (DrayTek Vigor2830n) that is connected to the main router. Is it possible to make the second router have a…
Matthew Tranmer
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WOL on single host with multiple NICS in same subnet

apologies if this has been answered before but I have not been able to find this specific kind of scenario and I'm not sure how to filter search results for something like this. Here is my scenario, also forgive me I am more towards the begginer…
Schwagmister
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confused about CIDR interpretation

I am beginner in networking and trying to understand subnetting. What I understood is that CIDR notation (Classless Inter-Domain Routing) is an alternate method of representing a subnet mask. It is simply a count of the number of network bits (bits…
NNN
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Ubuntu 20.04 server unreachable from external world

i have an Ubuntu server where i can not access the server from external machines. I have tried to ssh to the Ubuntu machine but it seams that all requests are drooped or does not arrive. I have not set any special routing or ip configuration. The…
Balázs Dyntell
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How am I receiving ARP brodcasts from a different subnet?

My local IP/subnet is 10.33.19.*/24, and yet I am occasionally receiving broadcasts requesting information from and concerning IPs in the 10.17.*.* range. I was of the impression that ARP requests do not pass through subnets. Am I wrong?
Idunnoanymore
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Netplan, two gateways for two subnets

I'm trying to get working following: Have 2 subnets (ie. 192.168.15.0/24 and 192.168.19.0/24) and two gateways (192.168.105.1/24, 192.168.109.1/24), and Ubuntu 18.04 server with netplan as router (.1/24 in subnets, .2/24 in gateway subnets). Goal is…
Belegot
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I need help connecting to system running as gateway

I need some help with a new network I set up. I have a network setup according to the Masquerade Alternative on this answer, with the tap and bridge, and everything is mostly working. Here's a (bad) sketch of the topology: (internet - via WiFi) <->…
werlious
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Server 2019 AD Subnet "Best Practice"

While assigning subnets to a single server on a single site, I am not sure which way to properly create the subnet. Example: If I have a single DHCP Scope of 10.190.8.0/21 (addresses 10.190.8.1 to 10.190.15.254), what would the proper "Best…
Brian
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Circumventing Subnet Security

My understanding is that subnets are contractual agreements between hosts on a network. Assuming all hosts are connected on layer two, subnets would provide no insulation from an attacker attempting to pivot between machines. Is this correct? If so,…
SlipperySnake0
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How to deal with OpenVPN subnet collission?

My home subnet is 192.168.0.0/24 and very annoyingly cannot be changed at present. I want to connect from remote networks via OpenVPN but obviously frequently find myself on subnets that have provisioned existing IPs and therefore we get a clash. I…
Turkeyphant
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