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

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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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how to split up network into two subnets with only one router

I have one router on my home network. This acts as the main WiFi access point for all devices, as well as being connected to a simple switch for my home lab. I would like to be able to isolate my home ...
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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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807 views

2 TP-Link routers are connected

I have two TP Link routers, one is connected to the ISP and the other's WAN is connected to one of my Ethernet Ports (assigned IP from router1 192.168.1.200). Hosts in the 2nd router (192.168.0.0/24) ...
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Arch Linux device with static IP address, new router not finding the device

I have a device running Arch Linux on my network (Raspberry Pi to be exact) and I do not have a cable for the display. I typically used it by ssh client and had it configured for a static IP address ...
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2answers
87 views

Cannot reach the computer in WAN

I wanted to split the internet connection in my room. And my brother also wanted a better wifi accessability. So we bought a router (NETGEAR JWNR2010v5). All we wanted works great, good wifi. I have ...
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30 views

IPv6 subnetting - coverting decimal to hexadecimal

I came across a question on IPv6 subnetting, You work as a branch network administrator of a large company with offices in many cities around the world. The corporate network is currently in ...
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41 views

Subnetting based on networking needs

I am unable to visualize the solution to the following question Your company has obtained the 131.107.168.0 /21 address space from an ISP. You now need to design this address space to accommodate the ...
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32 views

Is it possible to sniff packets on other subnetworks?

I've been reading about packet sniffing and was wondering if it's possible for someone to sniff packets on subnetworks other than the one they're on. Since the point of a subnetwork is that devices ...
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3answers
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How come I can ping google but not a PC on a different subnet within my campus network?

I am a newbie to the networking world. I know that one cannot ping two PCs connected to different subnets unless you have a router in between. But, I was wondering how come I can ping www.google.com ...
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Set up two (2) IP addresses on the same network card?

I think it is possible to set up 2 IP addresses and subnet masks on one NIC in Windows XP. How can this be done?
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Relationship of routers to networks

I was wondering, in networking, what is the relationship of routers to networks? Can the same router be the gateway for 2+ networks? For example, if I have a wireless router at home, can I configure ...
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51 views

Ways to differentiate between home and office private network

Let us consider there are two networks 1) home network and 2) office network. I have an application which will get the system IP and MAC Address of the installed machine while launching the ...
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1answer
60 views

Windows Networking - Treat two subnets as one network

We have an existing (old) network (10.0.0.0/24) and we're trying to add another (new) subnet (20.0.0.0/24) using a Cisco 2901 router. I added the appropriate routes and tested everything out. We're ...
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1answer
40 views

Active directory sites and services

I have 192.168.1.0/23 subnet for wired connection and 192.168.2.0/24 for wireless connection. Do I need to add 192.168.2.0 in AD Sites & services. Right now I have 192.168.1.0/24 added in the ...
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1answer
331 views

Home network with two routers and just one Wifi

I know it is a pretty lame question, but I am not a pro in networking, so I will still ask it. And I will try to explain details where possible. I want to create the following setup: Phone line is ...
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31 views

how the pc1 checks pc2 subnet

pc1 and pc2 are different subnets Actually if a pc1 wants to ping pc2 at first pc1 checks pc1 & pc2 subnets whether they equal or not if not the frame will not cross the nic of pc1 my question ...
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Double NAT with access to both gateway web interfaces

I have a Cisco Linksys E3000 home router that I appreciate. However, my new (but temporary) ISP will want me to use their Huawei router for their service once I get connected next week. This creates ...
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static IP outside of subnet range

I have two questions, but let me explain the situation first. They are about the (static) IP address of a printer attached to the network. We had this networking setup, using a normal consumer router ...
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Connecting 2 different subnet masks

I'm no network genius, but I have managed to get most things running. I get confused about subnets and gateways though. We have an office server connected to around 20 PC's that all communicate fine. ...
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Should we load smaller subnets into Active Directory

Our network team is splitting up the subnets in each of our offices from /16 and /18 subnets to multiple /24 subnets. Our systems team is not changing Active Directory sites and services to replicate ...
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79 views

Query site for given ip from AD sites and services

Windows Active Directory maintains a list of subnet to sites assignments (in "Active Directory - Sites and Services" -> Sites -> Subnets). The subnet-to-site associationas ar used, obviously, by ...
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65 views

How to find largest possible IPv4 network within specified range

Let's say, we are given a range of 192.168.101.64 - 192.168.102.128. What is the easiest way to find the largest possible IPv4 network within specified range, including network address, subnet mask ...
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57 views

Interview on network connections

I was on an interview for a web developer position and for some reason, in the test, there was a question about networks that sounded like this: Your PC ip address is (--something like--) ...
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Identify the TCP/IP classes respectively by beginning octets

I am busy studying for a network exam and I am stuck with this zinger: By studying the following beginning octets, identify the TCP/IP classes respectively 1-126 224-239 240-254 ...
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Add printer from different subnet

i.e My pc ip is 11.19.20.3 with gateway 11.19.20.1 I have a printer with ip 11.19.22.25 with gateway 11.19.22.1 How can I add this printer to my pc?
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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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Why do we need subnet mask?

Since a IPv4 address already gives the information of the network and and host, why do we still need a subnet mask? The 1st Octet already specify the network class (1-127: A, 128-191: B, 192-223: C ...
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752 views

How to setup two-way routing with Tomato Wireless Client mode (different subnets)

Currently I have a Netgear R7000 as my main router, with internet coming from a Moto Surfboard SB6141 Cable Modem. I have a Linksys E3000 running Toastman TomatoUSB connected to the R7000 as a ...
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How do I add subnets and VLANS into my network [closed]

First let me say I have posted this on cisco support forums and just copied and pasted into a new question for you here. Secondly I think I understand that to route through subnets I need a router ...
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Concise IP information in OS X Terminal

Is there a command for the OS X Terminal that shows you only the most vital IP configuration information about your machine? I know there is "ifconfig" but that brings up a bunch of (in most cases) ...
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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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Creating Subnet Mask [closed]

ive been set this task. given the network 140.50.0.0/16 Create a subnet mask for 400 subnets with the maximum possible number of hosts in each subnet. My question is how do i create a subnet mask?? ...
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LAN and WLAN networks under same IP range

I'm a newbie in network stuff and haven't enough knowledge to do what I'm wanting for now, so I need your help, please. I've two networks, a wired and another wireless. The wired one is between two ...
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638 views

How do I get a /23 subnet mask from 172.16.0.0 /21 network address?

I have 172.16.0.0 /21 My mask is 255.255.248.0 I have an IP range from 172.16.0.0 to 172.16.7.255 255.255.248.0 11111111.11111111.11111000.00000000 Network------------------------- ...
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Subnet mask for maximum number of hosts?

How would I configure a subnet mask for a maximum number of hosts on a network segment? For example, let's say I need a maximum of 6 hosts per network segment for a Class C address.
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Why my subnet mask is not matching with my IP address?

I have a class 'B' IP address 172.16.XXX.XXX in my machine. My Subnet mask is 255.255.255.XXX. I am studying networking now. So until now I didn't care about masking about all. But from Wikipedia I ...
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Determine the best subnet mask for the 172.29.0.0 network, with 30 subnets and 1,100 host on each subnet

This was a practice question I found online: Question: You are designing a subnet mask for the 172.29.0.0 network. You want 30 subnets with up to 1100 hosts on each subnet. What subnet mask ...
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2 routers, 2 subnets?

Firstly I will explain why I require this setup. I have bought an ASICMiner Cube for mining Bitcoin. It frequently stops mining until I reset it, which is quite troublesome. After reading the ...
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510 views

OpenWrt router acting just as a switch with another WAN from wifi client

I have here this networking problem I can't figure out. My situation is following: ADSL cable connection to WAN, provider's router/modem (some Zyxel), DHCP running, original firmware, not possible ...
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56 views

When is the subnet mask used?

My NIC on my computer has a subnet mask. Is this only for it's own information? Or does the subnet mask get tossed into the TCP/IP headers to help the next device up route it? I'm guessing it's only ...
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160 views

What is the first valid host on the subnetwork that the node 192.168.197.13 255.255.255.252 belongs to?

Does anyone have any ideas what the answer to this is? What is the first valid host on the subnetwork that the node 192.168.197.13 255.255.255.252 belongs to? I calculated the answer myself, but got ...
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2answers
177 views

Devices on subnet cannot access each other but can access internet

I live in university halls and only have access to the internet and the network through one ethernet port. I have a TP-Link R860 router (wired only) and a TP-Link simple switch. If I connect using ...
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1answer
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Communication possible between 192.168.0.x and 192.168.1.x?

I have a problem I encounter on a regular basis. I have an access point with a fixed 192.168.0.x IP address. My network is 192.168.1.x. The problem is when I plug the access point into my network, it ...
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how do I setup my D-link DSR250n to use openvpn server

My aim is to make my Iphone connect remotely (and securely) to my home network and get from the DHCP (the d-link router) IP on the same subnet. This is because I have an client app that broadcasts on ...
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How do you route within an Amazon VPC subnet?

I have an Amazon Virtual Private Cloud that looks like this: 10.40.1.1 Internet Gateway 10.40.1.5 My OpenVPN Instance 10.40.1.100 My Windows Box What I want is traffic from the Windows box ...
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Remote network administration, solving 2 device 2 subnet merge

The problem: 1.) No Physical Access 2.) Very basic on site help 3.) Combining 2 subnets on 2 routers Now we know i cant go on site to move cords around so here are the current cord ...
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How to create a subnet at home with Linksys router

My home network consists of my ISPs router (Thompson TG585 v8) which is giving out both WIFI and Ethernet LAN connections on the 192.168.1.x range. The router's LAN address is 192.168.1.254. This ...
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Why nic with incorrect subnet mask can still ping the gate way?

At first, my network config was like this: $ ip a 2: em1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 3c:97:0e:bd:b1:68 brd ff:ff:ff:ff:ff:ff ...
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routing table, ip address for outgoing packet

Network Destination Netmask Gateway Interface 0.0.0.0 0.0.0.0 192.168.2.1 192.168.2.8 ...