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.

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IPTABLE & IP-routed netwok solution for HOST net and VM's subnet

I've got ProxmoxVE2.1 ruled KVM node on Debian and bunch of VM's guests machine. That is how my networking looks like: # network interface settings auto lo iface lo inet loopback # device: eth0 auto ...
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WAN and LAN setup for IPv6

We just got a IPv6 /48 range (a gateway and an IP address) for our company, but I'm unsure about how to set it up. We use FreeBSD 8.4 (pfSense 2.1) as a router/firewall. Currently we have IPv4 setup ...
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IPcop Multiple WAN Subnets

We have an IPcop firewall and have had no issues with it. We've had a block of 10 IP addresses from our colocation provider and have been able port forward from those to internal servers as needed. ...
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smaller CIDR network on larger Class C network

I have a network: 192.168.31.0/24 and computers on the network have static IPs 192.168.31.* I'd like to segregate 5 of those computers (say 192.168.31.201 - 192.168.31.205) and put them behind a ...
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406 views

'IPv6' Newbie with IPv6 address assigment

I am new to IP v6 and I am looking to translate some existing private IPv4 addresses into v6 address assignment. Can someone please help me to answer/explain the questions below? If I have an v4 ...
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Counting subnets [closed]

I'm reading about subnetting but have problems with these topologies. The book says that network1 has 4 subnets and network2 has 12 subnets. But I count only 11 subnets in netork2 ? If there is a ...
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117 views

How drastically can a public IP change?

On ISP level, is it commonly limited to some subnet mask? Is it possible or rare for an ISP to randomly change an IP's first 2 bytes? Just as a bit of backstory, I'm trying to deter users from ...
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567 views

OpenVPN subnet routing on openSuSE

First off: I have looked all over for a solution to this, but couldn't find anything. How can I make OpenVPN's subnet accessible to my LAN? BACKGROUND INFORMATION: I have an openSUSE 12.1 box that ...
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KVM with one host IP and a different subnet for machines

I've already setup a KVM host with proper IP configurations, but my host had me create DHCP and use that to assign the IP's to the machines. I want to see if there's an easier way to do it (or ...
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268 views

How to route two subnets to the internet via a linux box acting as router and proxy

I have a linux box that acts as router, DHCP server, and proxy. On my LAN side I need two subnets to have enough IPs: 192.168.100.0 - 192.168.101.255 - is the range I need. Both subnets must be able ...
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multiple physical interfaces with IPs on the same subnet

I have a linux box with 9 NICs on it, and I want eight of them to have unique addresses on the same subnet, e.g.: ifconfig eth1 192.168.123.1 netmask 255.255.0.0 ifconfig eth2 192.168.123.2 netmask ...
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461 views

Can't ping D-Link AP From different subnet

I have two different subnets set up on my network (say 10.10.10.* and 10.10.12.*). I am having difficulty pinging a D-Link access point (was a router, now configured to be an AP) located on subnet 1 ...
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571 views

dhcp same subnet different vlans

I want to setup my work's network so that all wireless clients get assigned a certain IP range but are on the same subnet as the other network devices. Currently I'm running dnsmasq for DHCP and DNS ...
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232 views

One ISP, two switches, two subnets

A quick overview of my environment: Network A: One gateway/DHCP server connected to multiple ISPs and connected to the switch One Netgear GS748T 48 port switch (and a few trunked switches for the ...
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358 views

IP Address Planning for our Network

We have a /24 IP Address range for PCs containing 240 allocated addresses at the moment. Our company is planing for expansion of another 50 PCs, our existing IP range is 192.168.8.0/24 Do we add on ...
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757 views

RRAS with DHCP when the IP pool is on a different subnet

I run a small business network and the last couple of days I have been setting up some equipment to add VPN capabilities to our network. I've got the following set up: Windows 2008 R2 with RRAS - ...
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Number of Subnets and total hosts [duplicate]

Possible Duplicate: How does Subnetting Work? Can someone please tell me what does this term means "A Class C network with 10 subnets" What exactly is 10 subnets? I know a subnet is ...
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Subnet mask calculation [duplicate]

Possible Duplicate: How does Subnetting Work? I watched some videos about subnet masks and ip addresses, but I have a question that I couldnt find an answer for it, how to approach this ...
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2answers
205 views

Network traffic across different (sub-)nets, how does the route get determined? [duplicate]

Possible Duplicate: How does Subnetting Work? Imagine there is a small network with 2 subnets. Both of the subnets have their own switch (means: all machines on that subnet share the same ...
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406 views

connecting to a network using route command

I have a computer with an external IP(192.168.223.220) and also an internal address (10.1.1.20) in order to connect to some servers that don't have external addresses only 10.1.1.xx . in order to ...
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176 views

Connect two networks

Connecting two different offices with a wireless link and linux boxes. Hardware: 2 CISCO RV42, 2 Dual Homed Linux Boxes running debian, 2 2Wire and 2 AirMax 5 Configuration is: Office A LAN A ...
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56 views

Server 2003 R2 - II6- granting access to website via IP with subnet range

We are trying to allow for a client to connect to our website. By default we are Denying all access except for those with the specified IPs we have configured to run, everything before has just been a ...
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3answers
171 views

Is 172.253.16.0/24 a valid private subnet?

I've been administrating an office network that was set up by someone else and I always found this weird about it: Their internal subnet is in this range: 172.253.16.0/24. It's been working fine, but ...
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592 views

Share one IP address with a simple router

We have just moved into a new office and have been given our 'internet connection' in the following form: One Ethernet cable in the corner of the room An IP address with subnet mask 255.255.255.0 ...
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693 views

Setting up a VM to use a different IP range than vSphere/ESXI host

I currently have a server that is running vSphere 5 (ESXi). My management interface (VMKernel) has an address of 173.198.215.78 and the gateway on that one is 173.198.215.78. It appears to be set up ...
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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 ...
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2k views

WDS and multiple subnets subnets

Goal: To allow my one WDS server on Subnet A to accept client PXE boots from subnets B, C, D, and E. Setup: Currently, WDS is installed and configured with default settings on my Deployment (Server ...
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2answers
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Connecting two subnets using an Ubuntu 10.04 LTS as a router

This has been bothering me for a couple of days, I have two subnets: 192.168.1.0/24 : This is the subnet used by my ISP/router. The gateway to the WAN is 192.168.1.1 192.168.2.0/24 : This is a ...
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Calculating the round trip time for ping packets

I am currently practicing for my network & communications course and have managed to confuse myself slightly on a question about packet round trip time. I have made a start but am now a bit stuck! ...
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456 views

Multiple subnets on a single interface in EC2

I'm currently working on setting up a QA environment on EC2 along side our production environment. All of the instances are within a VPC setup, with the following subnets: 10.0.83.0/24 - Production ...
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287 views

VLSM network subnetting and expanding of ip range

I have a subnet/vlan which is almost full I want to expand it basically my layout currently is below: VLAN ID Useable IP Range Network Mask 10 192.168.1.1 to 192.168.1.14 ...
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multiple subnets on the same cisco switch port

We have several servers on colocation and now trying to re-organize the network by utilizing Cisco ASA 5505 as a router and Cisco 3750x series switch. Network topology is looking like that: ...
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How to reach a device on a different subnet?

I have what may seem to be a basic question about routing, but I ask it because I am not sure where to start. I have a simple network setup: Client1, Win7, 192.168.0.50, default gateway is set as ...
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142 views

Block IPs in Local Security Policy

What would be the most efficient way of blocking a list of IPs in Windows 2008's Local Security Policy? Ideally, I would want to block the subnet that the IPs belong to. What IP subnets should I be ...
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110 views

Is auto-detection of routers on the local network possible?

Suppose one has configured a bog standard Ethernet connection - there is an IPv4 address, a subnet specification, a default route, even nameservers in resolv.conf, static routes everywhere - is it ...
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948 views

Public subnet configuration on a Cisco ASA 5520

I'm trying to set up a Cisco ASA 5520 as the main entry point for our datacenter setup. This setup includes: Three private networks (management, SAN and backup) that are used in a cloud server ...
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631 views

While using Nmap and sweep the network with a ping

I'm studying up on using Nmap, and there is a command that sweeps the network with a simple Ping scan to determine which hosts are online. The command is this: 1 [ignore_this]# nmap -sP 10.0.0.0/24 ...
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890 views

Subnetting into 6 CIDR/24 network and 2 CIDR/27 networks?

I am revising some questions for an exam and one of the questions was provide the ip numbers and a diagram for a company which has 3 branches. Paris/Berlin/Cairo (random locations I know) Now I belive ...
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506 views

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 ...
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99 views

Adding Static IP's to the NIC

We are currently working on migrating a lot of new machines to our network, and my job this morning was to setup all of the IP Addresses. I worked on this all morning, and when I got back tonight I ...
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190 views

PTR Record for host in VLSM subnet

I understand that this is the way a PTR record would be made on a Class A subnet (10.100.250.100 255.0.0.0) dnscmd /RecordAdd 10.in-addr.arpa. 100.250.100 PTR host.domain.tld To clarify the syntax, ...
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459 views

Howto maximize utilization of assigned subnet block for DMZ

I'm part time sysadmin for a small hosting company with currently 20 different public servers. We have a 27 subnet block that gives us a maximum of 30 usable IP addresses. That much I know, but how do ...
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551 views

Connectivity issues with dual NIC machine in EC2

I'm trying to get some servers set up in EC2 in a Virtual Private Cloud. To do this, I have two subnets: 10.0.42.0/24 - Public subnet 10.0.83.0/24 - Private subnet To bridge these two, I have a ...
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623 views

How to add IPs to a CentOS Server?

I wanted to know how to add the Prefix, the usable range & the subnet mask. I'm a completely new to this field so I would need step-by-step instructions. Thanks in advance. Regards, Netizen P.S. ...
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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 ...
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Connecting between subnets

The scene: There are two subnets Network A is 192.168.1.0/24 via router 192.168.1.1. There are two hosts, host A1 on 192.168.1.2 and A2 on 192.168.1.3 Both A1 and A2 have only one NIC, and none ...
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4answers
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Cisco ASA - Multiple Public Subnets

I have an existing Cisco ASA 5520 configured with a /28 subnet on the outside interface. My hosting provider just provided me with a new non-adjacent /28 subnet which is routed to the outside ...
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152 views

Selective Routing Between Subnets

I have a configuration with two subnets. For this example I will call them 192.168.1.128/26 (128) and 192.168.1.64/26 (64). The 64 subnet contains all the internal devices that guests should not be ...
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If I change a router's subnet mask to one that includes the old one, will the hosts with the old configuration still work?

Currently I have a router that is addressed as 10.2.1.1 on a 10.2.1.0/24 network. All of my hosts have default gateway 10.2.1.1 with mask 255.255.255.0. I want to know: if I change my router to ...
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Accessing VMWare Management Network from a different subnet

Here's the scenario... We've got a VSphere ESXi 5 box running on a 9.x subnet, our office runs from the 1.x subnet. We can access the VM's running on the box without issue (which also have 9.x IP's) ...