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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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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1answer
262 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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2answers
443 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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561 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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231 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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3answers
354 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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726 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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89 views

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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218 views

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
202 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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395 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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5answers
581 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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0answers
676 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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218 views

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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1answer
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
6k views

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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1answer
451 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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1answer
281 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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3answers
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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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3answers
6k views

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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1answer
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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2answers
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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1answer
933 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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2answers
603 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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880 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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480 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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1answer
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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1answer
186 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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1answer
446 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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0answers
544 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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1answer
621 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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2answers
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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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2answers
112 views

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
2k views

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 ...
2
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1answer
151 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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1answer
1k views

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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1answer
2k views

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) ...
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2answers
380 views

No route to host in different subnet

My new employer has two subnets, x.y.74.* (with default gateway x.y.74.33) and x.y.75.* (with default gateway x.y.75.1). The .75.* subnet is reserved for servers, i.e. machines that offer services to ...
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How to add subnets to Windows Firewall “local subnets”?

On Windows Firewall under an individual rule the scope tab allows you to define which ips are subject to the rule. One of the built in options is "Local subnet". How can you add an additional subnet ...
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475 views

In 2 tier firewall, how to configure so that only the 1st tier is doing the NAT

We recently done a network intra upgrade by adding an additional firewall as the 1st tier firewall, and making the current one 2nd tier. The setup is: WAN <--> 1st Tier Firewall <--> ...
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3answers
3k views

Changing netmask from /24 to /16 on a Windows 2003 domain

I have a Windows 2003 domain using 192.168.0.0/24 with all static addresses (no dhcp). I want to move to 192.168.0.0/16 because we need more addresses. I understand that we need to change netmask ...
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6answers
873 views

Running out of IP addresses

We are running out of IP addresses on our expanding network. The current range is 192.168.1.0/24. Considerations: We use an ISA server as a proxy for all web traffic, this is our current default ...
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2answers
525 views

Default Route Configuration by IP Range

I have a scenario where I need responses on a certain range of addresses to go out through one default route and another to go out through another but don't know how to setup the route add commands to ...
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3answers
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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 ...