Questions tagged [subnet]
Questions relating to IP subnetting, including planning, calculation and best practices.
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questions
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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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0answers
12 views
Will a IP address have the same first assignable address if the subnet mask changes [closed]
I am given homework to complete subnetting scheme and addressing table based on an IP address and 3 different Lans. The IP address is 172.20.0.0/16 and the 3 LAN requirements are first Lan requires ...
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0answers
11 views
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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[SOLVED]Tunnel is not reachable on it's own subnet [closed]
I have created a subnet. IP Route table looks like this:
100.69.0.1 dev ppp0 proto kernel scope link src 100.69.29.138 // isp stuff
192.168.0.0/24 dev br0 proto kernel scope link src 192.168.1.1 ...
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0answers
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What is the first and last address of a subnet? Is it the Network/Broadcast or the First/Last usable address? [duplicate]
For a computer science exam the question was:
Find the first and last address of the subnet containing XXX.XXX.XX.XX/XX
I put the network and broadcast address and got it wrong. Those who put the ...
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0answers
12 views
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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0answers
8 views
Subnet Mask, Subnet address, Host Address [duplicate]
Given the subnet mask 255.255.248.0, how many bits are used for the subnet address, and how many bits are for host address? Also, I cannot figure out what is the subnet broadcast address if one ...
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1answer
23 views
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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0answers
19 views
What is the Subnet ID and Host ID [duplicate]
As I'm studying computer networking, I stumbled upon the following image:
I'm confused about a few things here. I understand that, because the IP is of class B, the first two bits must be 1 and 0 ...
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0answers
8 views
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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0answers
7 views
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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0answers
17 views
What would be the best way of subnetting a network that has 172.16.0.0/24 network? [duplicate]
This is for a school assignment. Im trying to make a college LAN layout with 1 main campus and 3 branch campuses. The full specifications are:
• Represent multiple building/classroom PCs with two ...
0
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1answer
27 views
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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0answers
12 views
Need to understand how assigning addresses work in following problem [duplicate]
I am posting here because even after going to professor and TA I am unable to grasp the following
problem from the book. I don't grasp how to addresses are being assigned.
For the A part it makes
...
0
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1answer
21 views
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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0answers
13 views
How to divide a network into equal subnets? [duplicate]
Split the network 10.200.20.0/27 into 4 subnets and submit the network address of the 3rd subnet as the answer.
Split the network 10.200.20.0/27 into 4 subnets and submit the broadcast address of the ...
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1answer
19 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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0answers
9 views
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?
3
votes
1answer
41 views
Recommended IPv6 prefix size for PPP to a single host?
I am using PPP to create a IPv6 connection to a remote host.
What is the recommended IPv6 prefix size for a single host at the other end of the PPP connection?
Should it be /128, because there is ...
0
votes
1answer
43 views
Does every link between routers demand a new subnet?
This might be a stupid question but I'm new to this.
I am studying a class about basics of networking and I don't really understand one question that we have.
We need to a divide the given IPv4 ...
1
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2answers
56 views
Transfer subnet needed between Firewall and Routing Switch?
When looking at the image, the Switch is routing capable (L3) and is the default gateway for clients in the LAN. We plan to introduce a new Firewall and stand before the question if we should give its ...
0
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1answer
20 views
In gnss3, why can't I ping my cisco router from my VM?
I have the following network, I have never configured a Cisco router before so I'm having a little trouble. In router R1 I used the following commands to assign an ip to the router:
configure terminal
...
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0answers
11 views
What is the use of a host mask/ wildcard with respect to subnetting and ranges? [duplicate]
Taking the example of 10.0.0.0/20, that means my range is 10.0.0.0 to 10.0.15.255 I got that range because I know that the wild card is 0.0.15.255 and I just add it with the beginning address 10.0.0....
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1answer
120 views
Why does this ip address give me an error “must be valid ipv4 cidr”?
If I set up an AWS VPC with CIDR of 10.0.0.0/20 then the range is 10.0.0.0 to 10.0.15.255
I make a subnet now. Why does 10.0.15.15/28 give an error. Isn't it's range 10.0.15.15 to 10.0.15.30 which is ...
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1answer
920 views
“Destination host unreachable” when pinging a pc from another network
I tried to build a simple network in Packet Tracer and I get "Destination host unreachable" when I try pinging a PC from another network.
Pinging PCs from the same network works.
When I use ...
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0answers
8 views
Confused in what maximum number of hosts and maximum number of subnets mean [duplicate]
Given a 172.12.0.0 /16 to be subnetted to appropriate networks. Branch 1 has 80 hosts, Branch 2 has 31 hosts and Branch 3 has 75 hosts.
I've already made a subnet table based on these using VLSM:
...
0
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1answer
35 views
Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?
Well, it's just as the question states,
Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?
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0answers
9 views
How many hosts can I have on a class C network [duplicate]
Please bare with me, I'm a complete newb to networking and I'm going to try and explain my doubts to the best of my abilities.
So, to start off, I know that classful networks aren't a thing anymore ...
0
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1answer
3k views
How to find the first and last address in the FIRST AND LAST SUBNET [duplicate]
So there's a problem that literally stress me out every time I look at it. It's like I almost understand it until I get to knowing how to find the first and last host in the LAST address (last subnet)....
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network question [duplicate]
can someone please explain this question and answer
Based on networks 10.8.16.0/22 and 10.8.31.0/21, which of the following is the BEST summarized CIDR notation?
A. 10.8.0.0/16
B. 10.8.0.0/19
C. 10.8....
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0answers
6 views
IP address, network ID, host ID and subnet ID [duplicate]
I am studying a course about computer networking and again I stumbled upon a section that raised a question. I found very helpful people in this forum and I hope you can help me once again.
During the ...
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0answers
16 views
Why is it called a “subnet mask” and not just a “network mask”? [duplicate]
Let's say I have a private home network of 192.168.1.0 that is capable of containing 254 hosts. In this case, the configured subnet mask "255.255.255.0". This conveys that the network ID is &...
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0answers
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Why does sub-netting not give us more addresses? [duplicate]
Sorry if this is dumb, but I am very knew to learning about networks.
Here is my reasoning?
Let's take the address, 24.50.12.4
if we subnet it with /16 then the network address is 24.50 + host is 0.0....
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3answers
480 views
Routing between completely separate private networks
I’ve got a request from a partner vendor
in a completely separate routing domain to directly route a /24 rfc1918 network on my rfc1918 internal network. The proposed solution has their handoff ...
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0answers
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Is 12.23.34.45/24 a valid IPv4 subnet definition? [duplicate]
I believe the question says it all: when referring to an IPv4 subnet, is it valid to use 12.23.34.45/24?
If it is, is it equivalent to 12.23.34.0/24?
If it is not, can you refer me to helpful ...
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0answers
195 views
difference between network address and subnet address [duplicate]
Now this question seems a bit childish to ask, but since i am new to networking, so i think i should ask the question here. while studying about subnetting, i was trying to understand a subnet mask, ...
0
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1answer
69 views
ASSIGNED or AGGREGATED-BY-LIR status of IPv6 subnet used for Virtualisation
According to the RIPE NCC IPv6 Basics training slides the ASSIGNED status should be used for your own infrastructure and individual (large) assignments to customers. The AGGREGATED-BY-LIR status ...
0
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1answer
29 views
Can i/how discover subnet CIDR from IP range? [duplicate]
i have found the IP range 120.76.0.0 - 120.79.255.255 that i want to ban in iptables the way i write x.x.x.x/xx format. Please how to know what that x.x.x.x/xx should be? I have found some online tool ...
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0answers
13 views
How to select CIDR blocks when subdividing a network? [duplicate]
I saw these two questions, but they are still too over my head and start too far along the path:
How to divide network into subnets?
How do you calculate the prefix, network, subnet, and host numbers?...
0
votes
1answer
51 views
Is it possible to know the mother address of a subnet?
The mother address is X, have Y numbers of subnets (children), we already know 2 of the mother's children, they're:
10.1.192.0 /20 [edited]
10.1.240.0 /20
Is it possible to know the value of X and Y ...
0
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1answer
29 views
What are some techniques to infer the subnet being used? [closed]
Given a list of thousands of IPv4 addresses and that you have no direct access to these hosts, is there a service or a methodology to infer a subnet that's possibly being used?
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0answers
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Basic Subletting 10.239.142.216/11 [duplicate]
First time poster (kindly don't eat me alive)
i was using https://subnetipv4.com/ to acid test my subletting skill i got 9/10 correct
this is the chosen one that broke my streak
as you can see i ...
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1answer
116 views
different network mask and subnet mask and netmask [duplicate]
1- what is network mask?
2- what is subnet mask?
is there any differnt between network mask and subnet mask?
i'm tried to search about network mask and nothing found is it called netmask ?
thank you
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3answers
255 views
32 bits or 30 bits for subnet mask
I'm new to networking and have a question about subnet masks. Imagine we have a class B IP address. I know how to calculate the subnet mask. My question is: What is the last subnet mask that we can ...
0
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2answers
127 views
Network topology for merging two different layer 2 networks
I have a scenario, (shown in attach diagram)
where i need to merge traffic from two server 1 , 2 to target server 3. All three are on different vlans/subnets.
With layer 3 switch in between would it ...
2
votes
1answer
75 views
what were the classless routing protocols used with VLSM when it was first introduced?
Since VSLM is supported only by classless routing protocols, if VSLM was introduced in 1987(RFC 1009) and all classless protocol(RIPv2 developed in 1993 , OSPF standardized in 1989 RFC 1131 ) cited ...
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2answers
46 views
Can a Subnet have more than one CIDR range?
For many years I thought of a subnet as a single contiguous range of ip addresses expressed using CIDR notation.
However on GCP a subnet can have a primary ip address range from which VMs get ...
0
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1answer
46 views
IPs that don't have subnet mask
I'm new to networking. I know that some IPs don't have a sub net mask like 127.0.0.1 and the range that starts with 127. I wanted to know if there is any other IPs that don't have sub net mask.
0
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2answers
537 views
Two routers on the same subnet - Possible issues?
What issues can occur when two routers are set to the same subnet (no cascading, both cable connected to the same switch)?
For instance:
- LAN: 192.168.1.0/24
- Router A: 192.168.1.254 - No DHCP, ...
1
vote
1answer
148 views
What is the last usable address in an IPv6 network
IPv6 does not have broadcast, so is the last address usable? Besides it being long, is it bad practice to actually use it?
For example: A:B:C:D::0/64 starts with A:B:C:D:0000:0000:0000:0000 and ends ...
