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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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In AWS VPC subnet id changed

I deleted the default subnet in my VPC and tried to create new. After creating the new subnet it showed a different subnet id, as you would expect. When I try to create subnet group in RDS the same subnet shows the Default subnet's id that was…
Gireendra Sharma
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How can I send the same traffic to two different VLANs on the same subnet?

We have a data feed coming into a single Linux server (CentOS 7). We need this server to forward all the data to two different VLANs with the same subnet. We currently have software running on the server that can mirror data to two different subnets…
dippynark
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How to do Fixed length subnetting?

This was an exam question last year, and I was trying to figure out how to get the answer: A small company is assigned the class C network 205.67.35.0. You need to divide this network to provide subnets for three departments using fixed-length…
User14981
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Creating IP ranges from forwarding table

I am working through problems for practice and have been given: Consider a datagram network using 8-bit host addresses. Suppose a router uses longest prefix matching and has the following forwarding table: | Prefix Match | Interface | | 1 …
Jean480
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Access MAC addresses (IP to MAC - ARP) between two subnets. Seperated via router

I've come across an issue, and after spending days investigating I've realised I need some advice. My networking skill level is still quite low. I've got two routers, with two LANs. I've connected one of the routers to the other via a LAN <-> WAN…
Josh
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disallow Samba WINS from making hostnames viewable across subnets

I have a samba server set up at work for simple things, such as printer and folder sharing. There is a "internal" subnet and VLAN and a "guest" subnet and VLAN. Samba runs on the same Debian machine which is also acting as firewall and router,…
user2726974
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Set default route to virtual ip

I have a Virtual private cloud running on 10.0.0.x. In this network two machines share a virtual ip to provide HA and connection to the internet via aaa.bbb.ccc.164. There configs are: Proxy1: eth0:0 inet addr:aaa.bbb.ccc.164 …
Emiel Lohr
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3 routers with three subnets to connect with each other without conflicts

I have a network environment with three routers: router #1 uses 192.168.1.x (TP-LINK TL-WR340G using it as switch) router #2 uses 192.168.3.x (SonicWALL TZ200 using it as DHCP and VPN) router #3 uses 192.168.100.x (Huawei HG8245Q with high speed…
ClearBoth
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Routing inernal network

I know this is not the ideal or close to ideal network setup, but I have just setup a SBS 2008 server on a KVM/VPS and have encountered a networking issue. I know that the i will lose server feature functionality by not setting up the server the way…
EdTrud
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IP on different subnet mask

I'm still learning the ropes of Windows Server (specifically 2012R2). My assigned task is to setup a static local IP address, I managed to get it set to 192.168.1.96 (with subnet mask 255.255.255.0) However they need the ip to be on 192.168.2.96,…
Gaza
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Azure Virtual Network Custom DNS

I created a virtual network and put 2 VMs in one subnet. But they were not able to ping each other using their hostnames. I need a DNS Server implemented so that hostnames in the subnet can be resolved to IP addresses. How do I do that? Any help…
Anindit Karmakar
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Subnetting - Am I doing this right?

I'm planning my first network with 2 subnets and came up with the following schema: I'd like to know... Would this work? Did I use the right amount of routers? Did I configure everything correctly? Plus, do I need to configure static routing here,…
Johnson
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Why would a public subnet be used here?

I'm a former DBA/Developer who now handles all IT aspects in a new role, more by chance than design - you know, "he used to be in IT so obviously he can handle everything" type of thing. I've set up basic home/office networks before, but I do not…
Jake
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Can 192.168.20.4/24 describe a network or only a host?

As I understand it IP 192.168.20.4/24 can only describe a host (24) on net 192.168.20.[1-254]. Now when describing a net; can 192.168.20.4/24 be a valid network ID, or should such a network ID always end with 0, as in 192.168.20.0/24, where 0…
JohnyTex
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Is it Possible to Capture All HTTP Packets to a Target IP on a subnet?

I've been trying to use tcpdump to capture packets to a target IP on my subnet, but am unable to do so successfully. I've tried: tcpdump -i eth0 net network-ip-address/27 -A and tcp port 80 But it only gives me the packets I send from my IP to the…
Hikari
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