A subnetwork, or subnet, is a logically visible subdivision of an IP network.

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Lan to Wan setup how to connect two subnets

I hope someone can help me with issues I have with my home network. I have a Billion 7700N modem/router and currently I added a Western Digital N600 dual band router. By default (following setup DVD ...
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2k views

Two subnets block traffic between them but allow internet

I have 192.168.1.1/24 network that has a switch and several access points .There is a adsl modem at 192.168.1.1 . I want to add a new network 192.168.2.1/24 with its own access point and switch. so ...
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557 views

How can i connect 2 PC with different subnets in 1 Switch in 1 Router

Well here is the problem...I want to connect 2 PC pc_1: 10.1.1.18/29 pc_2: 10.1.1.66/29 with 1 switch pc_1 -> Switch Fa0/1 pc_2 -> Switch Fa0/2 and this switch to a router ...
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Is 225.225.225.128 a valid subnet mask?

I have been told that we have two devices on a network: 10.40.225.142 and 10.40.225.144 These devices both have Gateway 10.40.225.129 Subnet mask 225.225.225.128 (note 225 is Not a typo) These ...
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736 views

Using local SSH tunnel from remote machine/another subnet

I have a Linux machine (box 1) with Internet service connected to a Wifi router sitting right next to it, through Ethernet (eth0). The purpose of this router is so I can share this Internet connection ...
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195 views

how to take subnet mask for an IP

I found this problem in a textbook, and I do not understand the solution: Find the subnet which the IP: 192.168.1.25 belongs to. Here is what they did: 255.255.255.224 for 192.168.1.25 and do ...
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Port forwarding from modem to a subnet

I have a webcam server that requires port forwarding to be able to access it from Internet, but the webcam server is located in a subnet and I couldn't make it work. Description of my setup: There ...
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48 views

What aids exist in RHEL v6 to calculate subnets without an internet connection?

The Red Hat version of the ipcalc program is very basic compared with some other versions that are available. Suppose you didn't have an internet connection and could only use tools that exist ...
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986 views

Window 8 machine cannot ping devices on same subnet

After returning from vacation during which several Windows updates were applied and my router suffered a hard power cycle, my Windows 8 Desktop can no longer ping other devices on the same subnet. ...
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“Destination port unreachable” when pinging computer in another subnet

In my home network, I connect to the Internet through a router (192.168.1.1). I also have another router (192.168.1.15, 192.168.2.1), this one using OpenWRT, configured as a wireless client. One of my ...
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781 views

How to put two subnets next to each other?

I've been using this calculator http://www.subnet-calculator.com/cidr.php, and I'm trying to figure out how to put two different subnets next to each other. For example, I want to have a /27 subnet ...
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3answers
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What is the effect or purpose of subnet on client PCs?

I understand that the subnet mask when combined with an IP is used to define the range of IPs that the router is responsible for routing. e.g. a router with 192.168.3.1 subnet 255.255.254.0, will ...
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4k views

Accessing computer in other subnet in the same network

At my university, we use the Eduroam wireless. It gives my Tablet 131.220.206.8 and my computer 131.220.202.17. I'd like to SSH to the Tablet, but I cannot connect to it. How can I access computers ...
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2answers
413 views

Splitting and connecting a small subnet

It's been a while since I built out a network so bear with me as I've lost some of the nomenclature. Given "5" usable static IP addresses from our ISP is it possible to use 3 of them for globally ...
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2answers
8k views

How to create a separate subnet for wireless access?

I need to configure my wireless router so all wireless devices are on a different subnet (192.168.2.1). The wireless devices should be able to access the internet, but ideally not the workstations on ...
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1answer
75 views

Subnets and gateways

I have a doubt with subnets and their gateways. For example assume I have four subnets using a mask of 255.255.255.192: A) 192.168.1.0 B) 192.168.1.64 C) 192.168.1.128 D) 192.168.1.192 If the ...
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638 views

Subnetting an IP address (172.16.0.0/12) into 2 subnets

Say I have the private network address 172.16.0.0/12 and I want to split it into 2 subnets. There are 12 bits used for the network number leaving 20 bit for the host number. I use 1 of these host ...
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700 views

Subnetting 90.103.80.0/21 into 8 subnets with at least 250 hosts per subnet

I am studying subnetting and I am not sure if I've got the hang of fully. Here's a question I've answered with my answers posted below it. I am particularly unsure about Question 4. I'd appreciate ...
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64 views

Junos - Shortening internet full bgp table

I want to shorten internet full bgp table (450K records) in such a way to catch all prefixes from /0 to /21 as well as all prefixes of /22 or more which are not included within /0 - /21 prefix range. ...
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1k views

Isolate two networks in one switch (Cisco SGE2000)

I have a small lab, which has 15 systems for development environment and 5 systems for Testing environment. I have only one Cisco SGE2000 (24-port) Ethernet switch. Currently all on 192.168.3.0/24 ...
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Setting up the subnet mask for two separate connections on XP?

I'm on Windows XP SP3 and basically my topology consists of 3 computers (see drawing for more detail), a wireless connection to the Internet and a wired connection to a router. My main computer (A) is ...
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192.168.x.x addresses with subnet 255.255.0.0

We are designing a network where we have 192.168.100.52 192.168.110.13 Initially the subnet mask was 255.255.255.0, so clearly these first two machines will not communicate with each other without ...
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918 views

Can't connect to Cisco router's settings page

Currently I have a 2 wire modem, and a Netgear WNDR3400. What I want to do is add a Cisco RV100W for its VPN features. Currently the Netgear router is connected to the modem via the WAN port. When I ...
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Why can't my OpenVPN client access machines on same LAN as OpenVPN server?

I have configured OpenVPN on my Linux server and Windows client according to the instructions here. My client can access the server, but can't get any further onto the LAN. My Server is ...
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200 views

Understanding the black magic of IPv6 addresses

my router (AVM Fritz Box) is supporting 6to4. So far it works but I want to understand what's going on. The last few hours I spent on a IPv6 book. There are many things I understand now but there is ...
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How do I join two subnets with two DD-WRT routers?

I have two separate DD-WRT routers which I would like to bridge together so that computers connected to each are on the same subnet (so that multicast can work between them for UPNP/DNLA media ...
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1answer
833 views

How to setup VLAN on same subnet as Ethernet

So this is what i'm trying to do: I have a physical NIC with dev name eth0 with ip 192.168.1.2 and gateway 192.168.1.1 and I want to setup a VLAN with ip 192.168.1.x and same gateway as eth0. ...
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71 views

Mixed use network access restriction

networking dummy here. I have a mixed business-home environment and would like to create a secure environment with controlled access. Here is a basic layout: http://i.stack.imgur.com/2lVGv.png The ...
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313 views

What is the point of connecting two routers directly together

The way subnets work, wouldn't connecting two router interfaces together require their own subnet between them. Unless that subnet mask has 31 bits, wouldn't that was adress space. I'm asking because ...
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623 views

Can a subnet has more than one gateway?

I am new to networking while reading Network+ Guide Networks books, I came into Subnets but, nowhere they mentioned how many gateways a subnet can have. For example for 192.168.1.0/24 the gateway is ...
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How to find the VLAN IP address?

How can I find the VLAN IP for a host? I have a Linux machine and as an example my host name is vhtask01 and IP address is 10.10.20.1. Now how can I find out which VLAN the server is in, what up ...
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6k views

How to determine the number of usable host in classful subnetting?

The number of subnets depends on the number of borrowed bits, but with the number of usable host is the thing that is not clear to me just like in this example.. I don't know where did the raised ...
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1answer
592 views

How to calculate CIDR notation from entries in a routing table

I have some entries in a routing table that were created using longest prefix matching, and I have to use those entries to determine the a.b.c.d/x notation (CIDR). This is an example entry: 11001000 ...
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725 views

access VPN machine macosx same subnet

I would like to access the office machine, which has a fixed IP, and is available only in its local LAN. Let say 192.168.1.100. I have a VPN with username/password connection and I am trying to ...
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Is there any reason to subnet a home network?

For networks I understand we set a netmask on each computer to let it know what IPs it can talk to without going through the router - IPs on the same subnet can talk directly to each other and do not ...
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451 views

How to find the network address of a given subnet?

How do I find the x th subnet of X.X.X.X /XX (300 th subnet of 172.16.0.0 /29)?
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769 views

route lan traffic through wirless mifi

I have a Windows 7 laptop accessing the internet through Verizon wireless MIFI configured as 192.168.1.1. It supports only 5 wireless connections, so I don't want to use up connections unnecessarily. ...
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How should I reserve IP addresses for my home LAN?

My Netgear router supports MAC-based IP reservation, and I'm setting up my very first home LAN where I want multiple Ubuntu servers to be given dedicated IP addresses. This is a consumer-grade router, ...
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I'm using Cisco Packet Tracer for Simulation and got error “ip address overlaps with..etc”

The 1st row is for my router and the 2nd row is for my LAN. What's wrong? Is my IP addressing and subnetting wrong? I already checked my configuration.
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1answer
223 views

Is there a way to detect a LAN's IP and its subnet mask?

I'm not a English speaker, but I'll try my best make it clear: If your laptop connects to a unknown local network (through a wireless or wired router) and there's no DHCP service at all, and nobody ...
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1answer
276 views

How do subnetworks communicate with each other? [closed]

I'm a networking newbie and I'm a little bit confused about the difference between the terms: Zone Sub-network Topology I've seen network diagrams where a business's network was divided into three ...
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4k views

When I change the subnet for the LAN interface on a Sonicwall firewall the WAN interfaces go haywire. What should I do?

Our company's old subnet was 255.255.255.0. To adjust for growth we decided to implement a 255.255.248 subnet. Upon changing this in our Sonicwall's LAN interface, our WAN connections quit working ...
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207 views

connect to subnet via VPN

i have VPN setup which is like this: ########### internet ############## internet ############ LAN ############ # macbook # --------> # VPN server #----------># PC A # -------># PC ...
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Two hosts on same subnet can't see each other

I've got two routers with two separate public IP addresses on the same subnet, but I can't get them to talk to each other. Both are connected to the internet (ISP-provided gateway) via Ethernet ports ...
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767 views

Selectively route traffic through VPN - how to setup subnet on OS X Lion?

I am trying to route traffic only for a specific domain over a VPN. I found what seems to be the answer in another question: Create the file /etc/ppp/ip-up with following content: #!/bin/sh ...
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Accessing a wireless router on a different subnet

Okay, I'll try to describe how this network is set up. I didn't do it personally, but it has been described to me. Firstly, we get our internet from a 3G wireless USB card from ATT. This means that ...
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Why subnet mask for IP 10.0.1.4 is 255.255.255.0?

Well I'm not sure whether I'm missing something here. But all I've read is that if first octet of IP is within 0 - 127 then it is categorized as Class A subnet and correspondingly Subnet Mask for ...
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859 views

Creating a DMZ with two routers

Hopefully it's okay to post semi-"I am learning" questions on this forum! Basically, I have two routers (both Netgear D834G's) and would like to setup a DMZ at home (merely for learning purposes and ...
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684 views

Routing to one IP via different gateways

I have an OpenVPN connection (point to point). When program connects to server it gets IP and Gateway dynamically, from server. I need to make windows add route to my secure server through given ...
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Do machines connected to the same switch belong to the same subnet?

When we talk about a subnet - do we mean all the systems connected to the same switch? If I have an assigned IP address of 10.0.2.1, am I in the same subnet as that of 10.0.1.39? When we talk about ...