Questions tagged [subnet]

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

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27 views

Datacenter network addressing with VLANs and subnets? [closed]

[Edited to scope down the question]I am trying to understand how enterprises deploy their datacenter networks using vlans and subnets. I am pretty confused with concepts so the question might be hard ...
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3answers
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TTL And Wildcard mask

I have two questions that i wanted to ask before. What is TTL?! I know that it's time to live for packet to die it count how many hops you jump in it every icmp but i don't know how it works and what ...
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FLSM with switches, remote access and server farms [closed]

Hi all I'm a student studying networking, I have several questions about FLSM 1) The design criteria facilitated that the IT department must have remote access and management on all 24-port switches....
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6answers
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packet routing between subnets on same vlan

I am trying to understand how packets are routed within the same VLAN. I understand that typically there should be a 1:1 mapping between VLANs and Subnets. However if i deploy the following ...
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3answers
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What is the intuition behind subnetting a base IP?

Take a look at this picture: My professor usually gives a topology like this and gives me a base IP. Let's say the base IP given is: 223.1.0.0/24. We're then asked to construct the given topology by ...
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giving a network 192 addresses from an internet pool [duplicate]

I am answering a question in my networking course. It says, given an internet with a 9-bit address space (/23 subnet mask). The addresses are to be divided between 3 networks N0, N1 and N2; with 64, ...
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How to subnet correctly? [duplicate]

For an organization having 5 departments with less than 256 devices per department and IP address pool 172.16.0.0/16. what is the correct approach for subnetting? 1. should 4 bit be borrowed to ...
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2answers
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Is the first address in an IPv6 subnet assignable?

I am working in a lab and have configured a series of /125 subnets between routers. Lets ignore the best practice for this discussion of using /64 for everything. When I assign fd00:f9a8:ffff::257 to ...
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Networking and IP address [duplicate]

If an Isp is allocated to equal ranges for 64 companies with address 130.192.0.0 what is the subnet mask, and host of the first and last company? If not being able to solve it..I’ve little knowledge ...
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1answer
32 views

how to get the smallest summary route? [duplicate]

i am practicing subnetting, then i got this question from the web. then the answer showed up as 172.16.0.0/12, i am puzzled right now how did that happen. please if anybody out there can explain to ...
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1answer
53 views

How to interpret subnet mask [duplicate]

I received a datasheet with which I need to configure a server that doesn't do dhcp but rather needs to use a static IP address. The sheet tells me to set the subnet mask 255.255.252/22. I tried to "...
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Cannot SSH into different subnet

I'm very new to pfSense and I have some very basic networking knowledge. I bought a server, installed Proxmox and virtualized pfSense. Now I want to create an enterprise ready network topology: The ...
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3answers
208 views

Cisco ASA 5512X does not allow connections across VLANs to internet

First time doing a network, I'm a software guy normally. I am setting up a network to share and internet connections to multiple properties. The goal is to segment each property onto its own VLAN. I ...
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22 views

Is 10.0.0.0/24 Class A or C [duplicate]

So I'm trying to understand IP Addressing and I seem to understand but then I came across 10.0.0.0/24 as an example I got confused because I thought 10.0.0.0 is a Class A address, but if it has /24 ...
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2answers
141 views

How does aggregate routes behave in BGP?

If a router received two BGP updates for the same prefix and both these updates are aggregate paths how do the router decide which one to take? Let us say that it needs to decide based on AS Path ...
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my question is about How to Subnet my network of 2 routers 1 switch (2vlans) and 2 laptops? [duplicate]

Loopback1---R1-------z--------R2---L2 | | | | |______S1_________| || ...
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How use the remaining adresses in this case? [duplicate]

I have this adress 201.217.5.0/24 and I made subnetting for a network of 5 servers so I use the adress /29 for that and I don't know if the remaining 248 adresses I can separate into /30 networks (...
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Why is 10.1.255.255 an invalid broadcast address?

I’ve been following the CCENT official certification book(100-105) and came upon this question in the “do I know this already?” quiz. The books only covered /24 subnetting only so far. Which of the ...
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2answers
37 views

How To Route Private Subnet Traffic To Internet Via Public Subnet In The Same AWS VPC?

This scenario is simple, created a VPC (CIDR > 172.16.0.0/16) in AWS Management Console, created 2 subnets in it. Public (CIDR > 172.16.1.0/24) Private (CIDR > 172.16.2.0/24) Public route is set on ...
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2answers
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Different Wi-Fi security levels under same private subnet

I'm working on an assignment and I'm given a hypothetical scenario where: A company has a local subnet where everything shares the flat address space 192.168.0.0/8 (this means that any device can ...
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1answer
31 views

VPN to a current subnet ID

I am sure this is a fairly basic question, but the standard google searches have not told me what I am looking for. I have a restaurant that uses an ipad point of sale on a dedicated subnet id: 192....
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1answer
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Cisco PT, Subnets overlapping? [duplicate]

I was just making up a scenario with three Routers connected to each other and a switch connected to each router, to then configure VLANS and Router-on-a-Stick. An image of this should be attached ...
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Calculate subnet id for each lan [duplicate]

Consider the following network where a router connects four subnets to the Internet. The first subnet (LAN1) must support at least 61 hosts. The second subnet (LAN2) 20 hosts. The third subnet (LAN3) ...
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3answers
68 views

Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...
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1answer
28 views

Different sized subnets [duplicate]

I am not sure the wording to search for and therefore this question has probably been answered before and i just cant find it. I am puttiing together a small WAN and im using /29 addresses for the ...
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2answers
19 views

Can 2 Directly connected PCs having the same network ID but different subnet mask talk? [duplicate]

If Pc1 has IP 192.168.10.2 / 24 ---> Network ID : 192.168.10.0 and Pc2 has IP 192.168.11.3 / 23 ---> Network ID : 192.168.10.0 directly connected (no switches no routers). Why cant i ping? But if ...
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1answer
16 views

Connect VPN with same Private Network [closed]

i have my Private Network on my Apartment that is 192.168.1.x/24 and in the Office we have Private Network 192.168.1.x/16. Is it possible to connect them through VPN, but i will not change my private ...
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2answers
60 views

In making network changes how would mixing sub nets affect the network

Will hosts with IP address manually assigned as 192.168.0.10/24 or 192.168.1.11/24 continue to function. When the router, DHCP, and switches are now setup to work as 192.168.0.0/22. We in inherited ...
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VLSM Subnetting [duplicate]

I was given this question to attempt but I have no idea where to even begin. I seriously can't get my head around this stuff any help is greatly appreciated. Given a global address of 172.62.0.0 /16. ...
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1answer
49 views

IP address source and destination translation without a gateway

I have a private network (no gateway) with a number of devices configured on one subnet (say A.A.A.0/24). I would like to change the IP addresses of all devices on this network to a new subnet (say B....
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Binary to decimal conversion question [closed]

If Decimal 15 = Binary 00001111 can it also equal 01111 ? If not why? sheet with conversion decimal-binary
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What determines the private ip addresses? [closed]

Right now, I am using internet at home, and my private ip address is 192.168.x.x. At work my private ip address is 10.x.x.x. In both of the scenarios, I did not play any role in selecting my ip, I ...
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MGUARD natting two subnets

I have two subnets: A: 192.168.1.0/24 and B: 10.1.0.0/16 With MGUARD GT/GT I would like to perform static NAT to have possibility to manage some devices inside of "A" subnet from "B" subnet. ...
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1answer
53 views

Are these two private subnets completely isolated from each other?

Im trying to set up a subnet address range in my local network but the private address ranges of 172.16.1.1 192.168.1.1 10.1.10.1 are all already being used. So I was wondering, if I make this ...
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1answer
38 views

Bringing two different hosts each in two different subnets into a same subnet [duplicate]

Physical Network: 11.11.10.0(mask:255.255.248) Subnet A 1 :11.11.10.0 IP A: 11.11.10.4 (mask:255.255.248 and 6 hosts) Subnet B 2 :11.11.10.8 IP B: 11.11.10.11(mask:255.255.248 and 6 hosts) Hi ...
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2answers
58 views

Meaningless bits in CIDR notation

Is specifying meaningless bits valid syntax in CIDR notation? For instance, the netmask of 192.168.13.0/16 is 255.255.0.0. In this case, the last two octets (00001101 00000000) are meaningless because ...
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1answer
555 views

Broadcast link vs. point-to-point links

What is the distinction between broadcast links and point-to-point links? In the paragraph below, the author switches between "broadcast link" and "broadcast network" which is causing my confusion..is ...
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3answers
146 views

How to do subnetting on IPV6 for non nibble boundaries?

As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/ The author ...
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Can you get more than 128 hosts with /25 mask? [duplicate]

I had an exam, and we were given an IP 199.177.63.0/25 and were asked to create two subnets of 66 and 10 hosts. Would first subnet already take 128 addresses? Sorry for stupid question.
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How do I find the number of IP addresses between two given IP addresses? [duplicate]

How would I find the number of IP addresses from 224.65.0.0 to 225.127.255.255?
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2answers
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Why can't we have duplicated IPs?

This may be a really dumb question, but I like to turn upside down what I already know sometimes, that way I can learn more. For example, given a network 192.168.0.0/24, I have a device inside with ...
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2answers
35 views

How many public static ips do one need if a PC is behind a wireless router?

If a PC is connected to internet through a wireless router. How many public static ips do one got to get from the ISP. Do the router and PC both require one static IP. What if I want to add more PC ...
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How is it possible to create 6 subnets? [duplicate]

The following task presents me with an insurmountable obstacle... Given is the following: IP: 192.168.40.0 Subnetmask: 255.255.252.0 Task: Form 6 subnets over this network and enter ...
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Finding number of host and network [duplicate]

Can someone explain to me how to do this homework question. I am confused on whether it should be 1022 host or 1022 networks: I allocate 10 bits as subnet number to identify a physical network, then ...
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1answer
23 views

Varible Length Subnet Masking - Smaller subnet with two larger subnets on each side?

Background: I'm redesigning a network of virtual machines. The virtual machines are all on 10.0.2.0/24 and 10.0.3.0/29 networks, the physical network is a 172.32.255.225/28 network, which stands ...
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4answers
141 views

Carving out a /28 network and still maintaining access to parent /24 network

In the diagram below, I'd like to carve out a /28 network from 192.168.0.0/24 and move it to another geographical location and still maintain access in and out of the original /24 network. ...
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0answers
14 views

What would be the router's gateway IP address that is connected to a network containing two smaller networks [duplicate]

Assuming that we can use any available public address, we have two separate subnet masks 255.254.0.0 which contains 131,070 usable addresses (IP range 126.240.0.1-126.241.255.254) and 255.255.128.0 ...
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22 views

class B Network subnetting Clarification [duplicate]

can anyone help on network subnetting, A class B network the ip address is 128.211.0.0/16 which means the subnet mask is 255.255.0.0 i want to create 20 subnet network from that the IP address 128....
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1answer
159 views

Same Vlan Name / ID on different switches network subnet same or different?

I have several switches (some on same floor and another on other floors) all connected to core layer 3 switches through trunk links. One of the vlan id / name is repeated along the switches. May I ...
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1answer
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Is this computer a threat? On same network range, but in a workgroup

We have a normal on-premise Class C network with an internal IP address scheme of 192.168.15.x (hypothetical). We have a SonicWALL device that acts as a VPN server for external clients, a DHCP server ...