Questions tagged [subnet]

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

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Make printer in different subnet accessible to other subnet

i am creating a network and i want the printer which is in a different subnet to be accessible by all other subnets. The router network is 192.168.10.0/24 further subdivided into /28 subnets. The ...
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Is there any point to learning about old network address classes anymore? [closed]

It's 2023 and I continue to see people write about IPv4 A,B,C,D, and E networking classes like they still mean something and without saying it's only mentioned for historical purposes. But they are ...
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The use of a link local IPv6 address

In a networking course that I'm following, there was a mention of several ways of how IPv6 link local addresses can be used, such as Assigning the link local address of a router/L3 switch as the ...
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What are all the reasons for using a separate /31 subnet for a p2p link?

For example in this LAN, the 13.65 and 13.66 are a separate subnet between slip and bsdi, but what is the reason that they have a separate subnet? The only reason i can think of is that bsdi cant have ...
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Question, provisioning divisions of network blocks with differing sizes based on number of hosts required [duplicate]

I was working on this question. To do this question I used this YT video to help me and I came up with these answers but I wasn't sure about them since there are no answers to the practice questions. ...
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Server with multiple NICs takes different route when answering

I have multiple servers which share 2 networks. That is the LAN Network at 192.168.1.0/24, aswell as the Backbone Network at 192.168.5.0/24. ┌────────────────┐ ...
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How do devices on a network communicate when they are only connected through a router? [duplicate]

This is in my router's routing table: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 ...
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Variable Length Subnet Mask with two hosts [duplicate]

I started learning subnetting and i encountered some problem involving Variable Length Subnet Mask and which problems i encountered so far is it just specify a specific number of host per subnet but ...
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1 answer
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Mask for sending network packets

When sending packets in a network, do the PC's all have to share the same subnet mask or can you dedicate comps to mask addresses? I am wondering if this also determines collisions and if it is a ...
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Routing question

Let’s say I have router A and B and a subnet 192.168.10.0/24. Can I use part of that subnet as a connector between router A and router B (ie. 192.168.10.0/30, .1 on A and .2 on B) and have a route 192....
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What is the Logic of AND and OR operations in subnetting?

To calculate subnetting for given IP address and the subnet address, we do AND operation first to get the network address and the first usable IP address of the subnet. Why do we use AND? I know it ...
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How many number of bits and hosts? [duplicate]

If it's an IPv4 address and it's in the class B network. Iam supposed to make 20 subnets, what will be my number of bits to consider for the subnet and the number of hosts?
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While VLSM subnetting, will there be a case that addresses are insufficient? [duplicate]

Note-:Here, IP address means IP address+subnet mask. I am studying network design. My question is will there be a moment where you choose IP address for subnetting but turns out finally that it's ...
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IPv6 subnets without delegated prefix

I have received an IPv6 network from my provider, say it's 2001:db8:1::/48. I did not get delegated prefix from them. I would like to use the IPv6 addresses on different networks behind a firewall (...
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What would be the correct way to go about subnetting an IP address for two networks? [duplicate]

I am struggling with how to proceed with this. I have started by converting the IP address into binary. If somebody could just give me a push in the right direction I would appreciate it! There are ...
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How many /56's are there in a /49 IPv6 [duplicate]

I am studying subnetting in IPv6. I came across the following question from a website called Subnetting Practice, which I will quote below. How many /56s are there in a /49? Could someone please ...
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Why shortened version of IP4 exists and it is undocumented but supported everywhere?

For example there is an IP address 192.168.0.1 It is clear that you can use it as the full line, but try that one 192.168.1 It will also work, and it will be automatically converted to 192.168.0.1 ...
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Why should I use vlans instead of subnets?

I know that this might be a trivial question for the more experienced. However, I am a student who has just started designing networks. Assuming you have to design a network of a school divided into ...
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How to create a subnet or secondary network? Do I need VLANs?

I am not new to IT, but in the past, I've always had a Network Admin to handle this type of stuff. That being said I know just enough to be dangerous. What I have is an old hodgepodge of different ...
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Why is this 254.63.0.1, not a valid host address?

Getting the below error, when trying to configure the ip address 254.63.0.1 as an SVI. Switch(config)#interface vlan 254 Switch(config-if)#ip address 254.63.0.1 255.255.0.0 Not a valid host address -...
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How to redirect traffic when one site goes down without downtime and the subnets are different?

We have a uniform high availability configuration [somewhat like 1] with the difference we have two different subnets, vlan and vsphere for two different sites, X and Y. The host in site X has ip 10....
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Dividing network into subnets [duplicate]

My teacher uploaded this example question and solution as explanation of the topic: I watched some videos about it but none of them made it fully clear, what I don't understand here is: What are ...
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ARP requests from a different subnet

Not sure if my question is on-topic here. I found the following question about ARP requests from a different subnet and I was wondering if and when this is an actual use case. The original question is ...
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1 answer
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How is CIDR used in ranges?

There are times where CIDR notation isn't used to subnetting or for routing/summarization but rather just for ranging IP addresses, IPv4 mostly. It seems very non-standard and it seems to be like a ...
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why ip adresses are divided into network portion and host portion when we already have NAT [duplicate]

I don't understand why ip adresses are divided into network portion and host portion? is the host portion really necessary when we already have NAT? for example, if ip addresses only have network ...
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Do the subnets x.x.x.128/25 and x.x.x.192/26 collide? Why or why not? [duplicate]

I am working with a vpc cidr of /23, and need to divvy up some public and private subnets for hosts, load balancers availability zones etc. please bear with this newbie question Please assume I am ...
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Can networks with different netmasks overlap?

Let it be this diagram: Can I assign such networks at each segment without overlapping? In my understanding each network has a range of usable IPs and those ranges overlapps each other. For instance, ...
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Why would we want to subnet/change CIDR of private addresses?

I am studying for my CCNA and my current topic is subnetting. I understand how subnetting works and how to subnet (calculate the network IP, the amount of hosts, broadcast, etc). However, I can't seem ...
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Subnetting and dividing networks [duplicate]

I am currently learning about how subnetting works and I need to get rid of some confusion. If we divide networks like this, and assign each network a different IP address (192.168.1.0, 192.168.2.0, ...
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Routing for same subnets in remote sites

Is it possible to have interVLAN routing with router on a stick topology, but with remote sites communicating via OSPF? In the diagram below, I can ping PC1 from PC0. What I want is to ping PC2 and ...
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Same subnet on multiple VPN clients

I have an openVPN server, where multiple clients are connected. These clients are usually routers, so they have a subnet behind these routers. I want to access all clients on these subnets if I ...
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Dividing a network into subnets using a router

I am learning about how L3 and IPv4 addressing works and I need some clarity on certain things. I've encountered the following topology So in this topology, the router stands in the center and ...
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Subnetting an network into different number of subnets [duplicate]

Assuming you are using a Class C IP address (195.16.1.0) and you need to create the following numbers of subnets for your network plan. For each of the numbers of required subnets below, provide how ...
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Connect a router to multiple router/subnet - Cisco Packet Tracer

I'm studying DNS Server. So I try this. Here is the flow when I request abc.com webpage from My PC. My PC (192.0.1.2) send DNS query to Router0. Router0 then forwarding to DNS Nameserver (10.0.0.2). ...
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Sharing one VLAN with two routers each one will route different subnet

We are transitioning to new WAN connectivity. I have one VLAN (let's say ID 10). Currently there is one router R1 that has one private subnet and one public subnet on the VLAN 10 which goes through ...
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Difference between network and sub-network

Today, at school I learned about subnetworks. So, let's say I have a 10.0.0.0 network with a 255.0.0.0 mask, I could subnet it into two networks, for example, 10.1.0.0 and 10.2.0.0, which would both ...
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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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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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1 answer
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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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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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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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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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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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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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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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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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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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