Questions tagged [subnet]

Questions relating to IP subnetting, including planning, calculation and best practices.

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How can I test if the subnet mask and default gateway are set for a device? [closed]

I understand how subnet masks work mechanically and how to convert from the mask to the CIDR bits notation, and I understand the concept of a default gateway. What I don't understand is what setting ...
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In cisco packet tracer, RIP not working when connected to different subnets [closed]

An organization is granted a block of addresses with the beginning address 200.20.20.0. The organization needs to have 4 subblocks. a. Cyber - 100 addresses b. CSE - 50 addresses c. EEE Department - ...
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Configure DHCP for VLAN [closed]

I'm configuring DHCP for VLAN on a router. At last, the computer can not retrieve the IP address. Below is how I have configured. Switch Switch>en Switch#conf t Switch(config)#vlan 10 Switch(...
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ISC-DHCP-server on ubuntu not working [closed]

Im trying to get a dhcp server running on my Ubuntu 20.04 laptop. the PC will most of the time not be connected to internet as it will be in the bushlands. I have tried to install the isc-dhcp server ...
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1answer
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Will 2 redundant Routers configured with HSRP consume 3 IP Adresses in each Subnet?

The Problem occured while studying for my exams Problem: I have to design a Network for a Company. The given IP Adress Space is 192.168.1.0/24 which has to be divided into 4 Subnets. These Subnets ...
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What does an IP Address with CIDR represent precisely?

This question is more a question of definition then a technical one: You have some network with the network identifier 172.16.0.8 and a subnet mask 255.255.255.248 (/29) We know that the usable ...
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1answer
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Duplicate IP addresses on different "levels" of subnets

My question is quite simple: let us say there is a 10.0.0.0/8 with the subnet mask of 255.0.0.0 (first 8 bits used up for network address). Let us say, one address in our subnet is 10.0.0.1 (subnet ...
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5answers
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What happens to the unused IP addresses in the subnet that falls in between two routers?

This is probably a un-realistic question, but a question nonetheless, that has been bugging me since quite a while now. Consider the below network diagram, where R1 is a part of a 10.0.0.0/8 network (...
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1answer
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How to choose IP address and subnet mask while forming a network

This question is bit novice. But, just wanted to clear any doubts as a starter for this topic. I have read about Classes of address like Class A, B, C. As I observe the Default Subnet mask for each of ...
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How can I set up two sub networks that can communicate by LAN but where only one has internet? [closed]

With only two routers, where one has a connection to the internet, is it possible to set up a second sub network that has no access to the internet, but where devices connected to either router can ...
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Really new to Networking and wondering how the first 3 octets of 255 is 1 network [duplicate]

Watching this video on subnetting and I am kind of confused as to why the first 3 octets are all counted as one network but the last octet only adding 1 bit to it makes another network entierly. I'm ...
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How to calculate subnet mask if the prefix is given like /29 [duplicate]

How can you convert a prefix like /29 into a netmask?
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Why isn’t there routing inside subnets?

As far as I know, inside subnets, there is no such thing as routing. How are IP-packets « routed » inside a subnet, and does this circumstance has an influence on how subnets are set up? Thank you in ...
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What is the significance of subnets in a network interface? [duplicate]

I am struggling to understand how subnets are used in interfaces (ie. virtual interfaces in Linux) I am not asking how subnets are calculated. An interface has an IP address, but it also has a netmask ...
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If person A has a network 123.123.123 and person B has a network 123.123, what happens if they both assign an IP to a device of 123.123.123.123?

This is something I'm confused about...if person A and B have networks with different subnet masks, then what prevents them from assigning an end IP that is identical? It makes me think I'm ...
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Personal VPN sub-network accessible through Work VPN? [closed]

I currently access my work network via Cisco VPN. At work, I have my own three computers and NAS on a personal dedicated router using my own DHCP. For several reasons, I do not want these computers to ...
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1answer
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why can a router make two PCs in different subnets access each other?

Case 1: PC A: 192.168.1.2 / 24, and it connects to LAN port1 of router A PC B: 192.168.2.3 / 24, and it connects to LAN port2 of router A Given above we know A and B can't talk to each other due to ...
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3answers
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Router interface on same subnet

Could someone please explain why can't be have 2 interface on same subnet? Do router use network address to forward traffic?
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lan with multiple ip [duplicate]

If imagine lan assigned ip from from this range (192.168.1.0/24) then can we assign another ip from same subnet mask? If no why?
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1answer
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Can wifi clients in same subnet talk to each other without a WAP?

I understand that a L2 device like WAP is needed to forward packets from one client to another within the same network (based on MAC mostly like in 802.11) However my question is, if there is no WAP ...
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1answer
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Must the host IP be contained in Router's subnet?

The settings are: manually set my host IP: 10.0.1.6/24, gateway: 10.0.0.138/24 they both know each other's MAC (arp -a shows the list) and there is a direct physical connection between them. From the ...
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Can an host on a subnet comunicate via an host on a segment of the subnet? and viceversa?

It's a theory only question. An host on 192.168.0.0/16 can comunicate with an host on the subnet 192.168.1.0/24 ? And viceversa? If no, why? NOTE: I already CAN calculate host, subnet, network id, ...
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Can two different LANs be part of the same private network? [duplicate]

If you had two geographically dispersed LANs with public IPs that are in a different subnet range to each other, (one is 154.30.24.x/24, and the other is 134.64.9.x/24) if they were physically or ...
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communication between two subnets [duplicate]

Let's say I have a computer 192.168.0.1 masks 255.255.255.0 and another computer 192.168.0.2 with a mask 255.255.0.0, can I ping the second computer from the first even though it's on a different ...
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Do any subnets "Network ID" AKA "Network Address" always have an even number as the last octet? [duplicate]

Should a subnet have a "Network ID" AKA "Network Address" (eg: the first address, which is always unusable, and is the boundary between the previous subnet and the current subnet) ...
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What's the different between a "mask" in route table and interface?

if we took Windows as an example, we can use the command "netstat -rn" to show route table as follows: IPv4 Route Table ===================================================================...
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1answer
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What IP addresses are appropriate for a network inside an embedded device? [closed]

I am making an embedded device with two processors, a "gateway" processor which is connected to external ethernet, and a "webServer" processor, which is only connected to the ...
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1answer
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Addresses in router's subinterfaces overlapping [duplicate]

I can't really understand why I'm getting overlapping addresses in subnets when they're between the allowed range. I have the network 192.168.1.0/24, and I have to create 3 subnets: A - 58 Hosts B - ...
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3answers
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How to make 2 diffrent networks in router ping each other

Hello i have this 2 routers how i can make them ping each other and alos the devices connected to them
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/8 base subnetting [duplicate]

I have a question on subnetting, the below question asks for the subnetting a /8 base network. I do not understand how to have at least 64 networks available while subnetting. I have checked the ...
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How do I calculate the CIDR-prefix a.b.c.d/P of a subnet? [duplicate]

It's been a while since I've done subnetting and I am once again returning to it due to work. Given the IPv4 prefix 33.22.20.0/23 = 00100001 00010110 0001010x xxxxxxxx I want to divide the network ...
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Why it is possible to use /31 subnet mask for point-to-point connection? [duplicate]

Suppose we have point-to-point connection between routers R1 and R2. Since there are always one client when sending packet, we don't need broadcast address in this situation. We also need 2 address to ...
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2answers
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can LAN port have multiple IP addresses of same subnet mask or different subnet mask

Can the router's ethernet interface have multiple IP's of the same subnet or different subnet mask? If yes what's the use?
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subnetting to give 4 2000 adresses [duplicate]

A large number of consecutive IP addresses are available starting at 198.16.0.0/19. Suppose that four organizations, A, B, C, and D, request 2000, 2000, 2000, and 2000 addresses, respectively, and in ...
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Why does ARP request not use a router instead of broadcast?

Why in ARP request does the source computer broadcast a message with the destination IP address to find the MAC address of the destination computer? Why doesn't it send the message to the default gate ...
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1answer
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Can a subnet use more than one default gateway address?

This follows another question i had previously asked.. I am in a situation where sub net A is connected to two routers {Router A{left}} and {routerB{right}}. The sub net A knows that the address of ...
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1answer
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Two networks with two different subnetmasks

This may be a dumb question but I really don't get it. Let's assume we have two networks. Network A and B. They have the following devices: Network A Device X (IP: 192.168.0.10; subnet mask: 255.255....
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Communication between subnets on Sonicwall firewall

I have a Sonicwall TZ-350. X0 is the default LAN with IP 192.168.10.1, and X1 is the WAN. I've set up a second local subnet on X2 with IP 192.168.20.1 for a single NAS device (no switch; the device is ...
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2answers
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How does RIRs actually ensure IP ranges ownership

I'm currently learning about CIDR, subnets and IPv4 classes. I understood that IPv4 classes were used to route traffic in the beginning but nowadays we use "dynamic" subnet masks with the ...
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How do i know which subnet mask should i use for an ip address of 135.135 [duplicate]

If i have to make two separate subnets for two different users like one for teacher and one for the students
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Need help with finding range of 120 subnets [duplicate]

i'm trying to find out the subnet address and broadcast address of subnet no 120. I know that for example if my subnet 1 address is 120.0.64.0 then i just need to keep adding 64, which is e.g 64 + 64 ...
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Could someone please clarify my understanding of this question? [duplicate]

I have been asked to use a particular IP address for a homework lab. The IP address is 218.179.169.7 and I have been asked to create 24 subnets and use the 16th network address. I dont fully ...
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Divide IPv4 network into subnets in a SPECIFIC order [duplicate]

My private addresses start at 10.10.0.0/16. I must make 2 subnets with 120 and 450 starting with the 120 one and not leaving any unnecessarily unused addresses. Let me remark, it's IMPERATIVE that the ...
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1answer
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Benefits of subnets in networks with externally hosted services

I'm a computer science teacher trying to understand the benefits of subnets. I understand how subnets are defined and how it can be determined using a subnet mask whether two hosts are on the same ...
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What exactly defines a LAN? [duplicate]

I'm trying to understand what exactly defines a Local Area Network as such? This is how Wikipedia defines a LAN, and that sort of how it's defined anywhere else I found: A local area network (LAN) is ...
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A question from an online subnetting quiz [duplicate]

Does anyone know the last usable host IP address for the 172.45.120.0/23 network? And an explanation of how you got the answer? It's a multiple choice question on an online subnetting quiz. I'm ...
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1answer
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Why is my assignment asking me use 172.16.0.0 private addressing and IPv4 sub netted Class C address Scheme?

I am doing a project for Cybersecurity and trying to build a college campus network. The complete instructions read: LAN infrastructure layouts for all campuses. • Represent multiple building/...
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1answer
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Connecting industrial devices to OPC server while keeping segregation [closed]

We have two industrial machines (let's call them Holding and Media) with configured network addresses 192.169.0.122 and 192.169.0.123 respectively. Currently they are isolated physically although ...
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1answer
39 views

directed broadcast ping on overlapping subnets

I have a router with 2 hosts connected to it. R: 192.168.0.1/24 host 1: 192.168.0.9/28 host 2: 192.168.0.15/24 Host 1's directed broadcast IP is the same as host 2, so what happens if host 1 pings 192....
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Dividing Network into Subnets [duplicate]

Divide the network 172.16.0.0/22 ​​into subnets of the following size: 128, 300, 40, 20, 20. How exactly is this done?

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