Questions tagged [subnet]
Questions relating to IP subnetting, including planning, calculation and best practices.
3
votes
2answers
687 views
Does IPv6 have similar concept of network mask?
Does IPv6 have similar concept of network mask?
How does it represent a network?
In the output of ifconfig, does prefixlen 128 represent a network mask?
lo: flags=73<UP,LOOPBACK,RUNNING> mtu ...
0
votes
0answers
13 views
determine the Network class [duplicate]
how can I determine The Network class from only subnetmask ,,without Network address
EX: 255.255.0.0 /16 written in my book it belongs to class A .How they knew it?
0
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0answers
9 views
Network addressing [on hold]
A network administrator is building a network for a small business that has 22 hosts. The ISP has assigned only one internet routable IP address. Which IP address block can the network administrator ...
0
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0answers
9 views
Can different PC's in the same home on different subnets communicate and access data without internet access? [on hold]
I understand basic routing and how a router is needed to communicate between subnets. What I do not understand is if internet access is needed for data to be accessed across subnets.
Thank you for ...
0
votes
0answers
11 views
Doubt on Subnetting [duplicate]
I have a doubt when I was trying to expend the network segment sizes. I wanted expend 192.168.1.208 to /27 and the following block to /28.
I don’t want to disturb the segment before 192.168.1.208 ...
-3
votes
0answers
25 views
How to assign host address ranges to following subnets? [duplicate]
I have to design subnet mask for following network. Looking at the network shown in Figure below, we see that 7 subnets are required. The largest subnet must support 13 host addresses.
In order to ...
7
votes
2answers
2k views
What is IP squat space
I came across this article and I'm trying to understand what is going on here, I found some packets on my network containing 22.0.0.0/8 and 29.0.0.0/8 IP range and It's based on:
https://en.wikipedia....
2
votes
1answer
44 views
Host IP address vs gateway IP address vs DHCP IP address
What is the difference between a host IP address, a gateway IP address, and a DHCP IP address when setting up networking devices?
For example, when configuring a virtual network adapter for my VM, I ...
-1
votes
1answer
25 views
Determine how many bits to borrow [duplicate]
I apologize if this is a too simple question for the people here, but this is my problem:
I am tasked to determine the subnetmask (binary), subnet mask (decimal) and the Prefix notation for a set ...
0
votes
0answers
15 views
Trouble understanding CIDR allocation [duplicate]
I am currently learning about CIDR allocations. Given the following problem:
Given a network of IPs starting with 212.201. 3 companies request 16.000, 2.000 and 29.000 IP addresses.
the problem ...
2
votes
0answers
32 views
Question about creating Subnets for a large amount of sites that will make a site-site tunnel to our datacenter [closed]
Our data center network is:
10.20.44.X/24
I want to have our sites use 10.X.X.X/24 (Site Number, VLAN, host)
EG:
Site 30
10.30.10.X/24 10.30.20.X/24
10.X would be corporate network 20.X would be ...
2
votes
1answer
24 views
How to convert size represented in one prefix length to another?
Example, let's say if someone says, I have allocated one /64 address. How can I convert that to a size in /30? How many /30 equals to one /64?
0
votes
0answers
35 views
Subnetting different ip on same networks with different mask
I am a little confused with subnetting. Looking for a proper explanation.
Suppose I have 3 routers A, B and C.
Int 1: 10.0.0.1/30 <-- Router A
Int 1: 10.0.0.2/30 <-- Router B
Int 2: 10.0.0....
3
votes
1answer
86 views
Juniper SRX320 Dynamic VPN, cannot route to Remote-Protected-Resource
Multiple VPNs setup with a Juniper SRX320.
The SRX320 has an irb interface as follows:
irb {
unit 0 {
family inet {
address 192.168.120.1/24;
}
}
}
I've setup ...
0
votes
0answers
15 views
Is there currently a formula for calculating the network ID when you know the amount of networks used? [duplicate]
edit: I wanted to mention the reason I am asking is because I have scoured the internet to find a formula similar
I figured a formula and wanted to know if such a formula is was already in use.
(...
0
votes
0answers
14 views
Subnetting babysteps - find networks [duplicate]
I hope the question title is correct :S For example i get the subnet 80.109.0.0 255.255.0.0 and want to make 8 subnets.
subnet mask in binary is
11111111.11111111.00000000.00000000
if i take 3 bits ...
18
votes
2answers
5k views
What is the difference between 0.0.0.0 and a loopback IP address?
From the book Computer Network:
The IP address 0.0.0.0, the lowest address, is used by hosts when they
are being booted. It means ‘‘this network’’ or ‘‘this host.’’
... All addresses of the ...
-1
votes
1answer
42 views
Network IP questions [duplicate]
Suppose I have a network with IP address 192.168.10.1/16.
This network can hold up to 65536 machines, from 192.168.0.0 up to 192.168.255.255 (65534 machines without the network ID and broadcast ...
0
votes
2answers
36 views
Accessing computers from different subnets with Dell Layer 2 switches possible?
I have two separate networks, a 192.168.20.x and a 192.168.80.x each on their own Dell X1026 Switch in Layer 2 mode. I would like the ability to access shares, ping, etc from computers on the .20.x ...
-3
votes
1answer
51 views
Is the following IP address and Subnet configuration valid for an internet host? [duplicate]
IP: 218.50.10.5
Subnet: 255.255.255.240
Can you tell me how to calculate it?
Edit:
I have entered Yes to all of these but I believe I am wrong on the last one but I can't figure out how I am wrong.
0
votes
2answers
45 views
Switch virtual interface
Single SVI can be mapped to a VLAN. When configuring VLAN on SVI, are there any fix no of subnets can be assigned to a single VLAN?
maximum number of VLANs can be configured on the switch =4094
...
-1
votes
2answers
123 views
Is IP address starting with 115. public or private?
I have one device with ip address 115.124.114.111. I want to know if IP address starting with 115. public or private?
0
votes
2answers
41 views
Make devices visible under Access Point
In our network, all wired PCs have a direct access to internet (83.XX.XX.XX) and a secondary IP address on the same NIC in order to access a subnetwork (192.168.10.XX) with wired peripherals (scanners,...
2
votes
2answers
154 views
Subnetting-Supernetting and Classful-Classless routing
1) Subnetting and Supernetting can both be done for private and public IP addresses?
2) Classful addresses weren't successful because of IP wasting, and that is why the 'network mask' was invented, ...
0
votes
1answer
46 views
IPv6 variables or other methods of shortening
From the dawn of when I heard about IPv6 many years ago, to my continued hesitance to make good use of it in today's world where it's eventually going to become necessary... my biggest issue I think ...
1
vote
2answers
61 views
Changing subnet mask
Currently I have a 10.10.10.0/24 network and am running out of IP Addresses. I'm not sure if I change to /22 mask, if I will still be able to communicate with some of the other facilities where we use ...
0
votes
2answers
55 views
Creating a network for three separate businesses in one building
What would be best practice in terms of creating a network to satisfy three separate businesses located in one building?
The building in question has three floors, each floor has 25 workstations and ...
-1
votes
1answer
34 views
Find Major network vslm
Im a bit lost with this question. In order to get proceed with the vslm i need to find the Major network of this subnet 121.118.40.0 /19.
For me the major network is 121.118.32.0/19, but when I run ...
1
vote
1answer
52 views
Finding the network address for given host IP?
Answer provides the procedure to find the network address when a packet with destination IP(198.51.100.223/21) is reached at a router.
But a network packet has the destination IP 198.51.100.223 in ...
-1
votes
1answer
23 views
Why CIDR block is assigned to subnet? [duplicate]
If VPC is assigned CIDR block 172.31.0.0/16, then I can create sub-nets within VPC, following this procedure:
172 . 31 . 0 . 0
255 . ...
3
votes
3answers
141 views
What is the actual purpose for having a 1:1 ratio between VLANs and subnets?
I understand the technical difference between a subnet and a VLAN. After looking through questions related to this topic, including:
VRFs, VLANs and subnets: difference
VLANS vs. subnets for network ...
3
votes
3answers
499 views
A VLAN maps several subnet
I've read the post Multiple Subnets in a VLAN and am wondering about the possible conflicts when using several subnets in a VLAN.
The recommended design is of course put a IP subnet in a VLAN.
If I ...
0
votes
2answers
40 views
Sonicwall DHCP Reserved IPs Broken After Expanding Subnet
I've just expanded our subnet at work from /24 to /22 now that we've started running out of IPs. For ease of transition, I left all statically-assigned IPs at their original addresses and moved the ...
0
votes
1answer
132 views
IP Addressing-Why All zero(0) and all one(1) in subnet id bits are reserved?
I'm studying about class less inter domain routing.
I've come to know that all zeros(0) in host id bits refers to subnet address and all ones(1) in host id bits refers to broad cast address. So, ...
1
vote
2answers
30 views
How can subnets not fulfil symmetric property?
While studying Internet Protocol, I came upon the following example of two devices:
Device A:
IP address: 10.1.1.1
Subnet mask: 255.255.255.0
and
Device B:
IP address 10.1.1.200
Subnet mask 255....
1
vote
1answer
32 views
IP Routing question
We are in the process of replacing our firewall and are keeping the VPN client traffic on the older device. The public IP range is being split between the two devices from our border router. All the ...
7
votes
1answer
249 views
Is the first address of the subnet a valid configurable address in case of IPv4 and IPv6 point to point networks?
Am I correct, that first address of the subnet is a valid addresses to configure in hosts/routers in case of IPv4 and IPv6 point to point networks? For example, in case of 192.0.2.0/31 one of the ...
0
votes
1answer
39 views
What happen if broadcast is made to first and last address of other network?
Broadcast to network id
What happens if you broadcast to the first IP of another network ?
broadcast to broadcast id of another network
What happens if you broadcast to the last IP of another ...
1
vote
1answer
37 views
I am trying to set up aDHCP server in a VLAN for practical of networking with Linux
I am a Linux user requesting advice about setting up a DHCP with a VLAN based on offices on one floor for the practical purpose.
Is this good enough for implementing a VLAN structure with a DHCP ...
3
votes
1answer
73 views
Can't ping the management IP of Switch
My topology is:
I am logged in to R1. I can ping 10.0.0.2 on R2 and 198.51.100.1 on R2, but can't ping the management IP of sw3 (198.51.100.2). What am I doing wrong?
R1#sh ip arp
Protocol Address ...
5
votes
2answers
187 views
Carrying remote VLAN via 2 routers to the local gateway
I have a serverA (192.168.15.1) from site A and VLAN is 15, however the VLAN 15 gateway is set at site B (192.168.15.254).
There are two ISP routers as a metro role to connect each other by subnet ...
2
votes
1answer
51 views
My OSPF Multi Area Topology is not reliable
I made an ospf multi area topology, but it's inconsistent. At times, host from the A area could ping to hosts in other areas however, sometimes otherwise (failed to arrive). Whenever I tried to do a ...
-1
votes
1answer
79 views
Dividing IPv4 Network into 7 Subnets? [duplicate]
I've been trying to figure out how to divide a network IPv4 IP Address into 7 subnets, where each subnet requires a different number of hosts.
For example I have the question:
"You are an intern at ...
3
votes
1answer
995 views
How to connect 192.168.1.x network to 192.168.100.x gateway?
Hello fellow networkers.
I am very new to this world and don't know a great deal about IP addresses and subnetting.
I however stumbled upon quite a big problem (for me at least - haha)
My entire ...
0
votes
1answer
271 views
(CISCO Packet Tracer) Overlap Error
I am trying to set up a network of for different organisational departments based on a given typology:
Using Cisco 2911 routers & 2960-24TT Switches.
With given addressing of:
'EIGRP 101' 172....
2
votes
1answer
53 views
Subnetting Access Problem
I am learning subnetting, and I am using Packet Tracer to design a network for a building with five storeys. I have used subnetting, with each floor having its own subnet. As a result, it is not ...
2
votes
2answers
273 views
Is Subnetting the Way to Configure this Network?
I have roughly 20 devices connected to a switch and want to divide them up by their different functions. Some devices are sensors, some are motor controllers, there's a data-logger, and a PC to ...
4
votes
2answers
70 views
Whether we usual use dot-decimal notation to represent network or IP by opposite mask?
Whether we usual use dot-decimal notation to represent network or IP by opposite mask?
10.10.10.0 0.0.0.255 # a network
10.10.10.0 255.255.255.0 # a IP
Update
if we represent a network, we can use ...
2
votes
1answer
51 views
Network discovery and establishing connections within Eduroam, a network split in subnets
For our current project we are supposed to create a peer2peer (no server) game application which is played by a teacher and his students on the Eduroam network. The concerns of the stakeholder ...
1
vote
3answers
69 views
Two ports both in VLAN 1 on two separate switches down/down
For someone who recently got their CCENT, I feel kind of stumped.
I have two switches, both are Cisco 3550s. I am using VLAN 1 as a management vlan and on S1, I assigned IP address 10.24.0.11/24 to ...
