Questions tagged [subnet]
Questions relating to IP subnetting, including planning, calculation and best practices.
565
questions
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Can I setup multiple subnets on a Home router (1 WAN Port, 4 LAN ports, 2 WiFi interfaces (2.4 and 5ghz))
So I was setting up my Home Network simulation in Cisco Packet Tracer and I noticed that there is an ipv4 field in wifi interface section of the home router, I thought that a typical home router can ...
0
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0answers
16 views
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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2answers
53 views
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
34 views
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 ...
-1
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0answers
12 views
IP Address mathematics-: How to add 120.89.96.129+399? [duplicate]
I am doing subnetting numericals to get my first job of network technician and I stumbled upon this math.
I know the range of IP is upto 255. But I am not exactly sure how to add value to IP address ...
-2
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0answers
36 views
How to solve this IPV4 subnetting numerical? [duplicate]
Design IPV4 sub network for an organization having 10,56,78,29 and 14 computers in each department. Use 192.168.10.0/24 to distribute the network. Write network address, valid hosts range, used host ...
0
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1answer
33 views
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 - ...
-1
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3answers
49 views
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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19 views
/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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0answers
7 views
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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0answers
8 views
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
71 views
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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0answers
11 views
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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2answers
55 views
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
47 views
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 ...
0
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1answer
40 views
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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0answers
64 views
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
40 views
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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0answers
9 views
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
0
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0answers
8 views
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
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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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 ...
0
votes
1answer
26 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
9 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 ...
0
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1answer
32 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/...
0
votes
1answer
23 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 ...
0
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1answer
25 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
48 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
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1answer
47 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 ...
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2answers
74 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
27 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
12 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
130 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
2k 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
votes
1answer
36 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
5k 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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0answers
7 views
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
11 views
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
563 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 ...
0
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0answers
16 views
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 ...
0
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0answers
313 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
87 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
30 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 ...
0
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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 ...
