Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [subnet]

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

-1
votes
0answers
15 views

Subnetting of the IP address 160.11.X.X [duplicate]

I have problem in solving subnetting of the following IP address 160.11.X.X. Original subnet mask 255.255.0.0 and number of subnets 6 (six).
2
votes
1answer
47 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 ...
1
vote
1answer
34 views

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 ...
0
votes
0answers
19 views

Confused in the concept of subnetting [duplicate]

I am doing sub netting and want to confirm that if my method is correct or not. Suppose we are to design a network that has 2 departments. Department 1 has 32 number of hosts and department 2 has 64 ...
0
votes
0answers
12 views

Subnetting related questions [on hold]

Coming up next week i have an examination on Networks.Having said that,crossing past papers i came upon this exercise(Picture).Most of the questions iv solved do not have this format so im kinda ...
0
votes
2answers
35 views

Connection between two networks with different IPs and identical subnets?

How can we establish communication between two networks with different IPs but same Subnets? Network Connection 1: (Factory Network for machinery) I.P = 192.168.19.X S.N = 255.255.255.0 G.W = 0.0.0.0 ...
-1
votes
0answers
16 views

Splitting into 4 subnets [duplicate]

I am trying to attempt a past exam question. The question is as follows, Consider a router that interconnects four subnets: Subnet 1, Subnet 2, Subnet 3 and Subnet 4. Suppose all of the interfaces ...
1
vote
0answers
47 views

Routes stopped redistributing through OSPF

I was entering a number of secondary addresses on some VLANs. In total there were 10 secondary addresses added. The subnets added were from three publically routable /24s (I will call them 25.0/24, ...
0
votes
0answers
37 views

How to route a specific users IP from WAN to a specific host IP on a subnet OPT1 (pfsense)

I host a game server, Players and Devs use the same launcher/client that has hard coded ports (5555) that cannot be changed. (No Configuration Files) How would I route Devs to the Development Server [...
-1
votes
0answers
13 views

How to get subnets given the IP Address [duplicate]

I just started learning networking and came across this question hope some of you can help me An organisation has been given a block of IP addresses in the form 128.119.64.40/20. The organisation now ...
1
vote
1answer
30 views

How to tell apart the type of the mask(subnet-supernet-net mask)

Say we have the the IP address 10.2.8.230/24 Anyone could say the following: It just represents a normal network:10.2.8.0/24 Or it is a subnet because normally this IP address is in the class A ...
0
votes
0answers
21 views

Subnet an IP addres to 4 equal subnets [duplicate]

If a subnet address is given as 192.168.10.0/25 How can i subnet the network into four equally sized networks and give the new network addresses along with the subnet mask and state the number of ...
0
votes
0answers
12 views

Host address not host range? [duplicate]

can someone explain to me how to get the host address? I understand how to get the subnet answer but not the host address, and majority of the google searches / videos always give me the host answer ...
-1
votes
0answers
14 views

Network ID(Name) in subnetting? [duplicate]

So when we wanna subnet the network of 8 hosts we will say for 8 different addresses we need 8+1(wasted broadcast address)=9 and there is this many different 2^4=16 states we have which needs 4 bits! ...
-1
votes
0answers
12 views

VLSM HW Question [duplicate]

--- PROMPT --- Assign network addresses to each of 6 subnets, with the following constraints. All addresses must be allocated from 214.97.254/23; subnet A should have enough addresses to support 250 ...
0
votes
0answers
28 views

Subnetting - IP Address Classes [duplicate]

I've been trying to get my head around subnetting but seems to be getting confusing with the classes and IP ranges within that class. Example: IP Decimal:10.2.225.234/22 IP Binary:00001010 00000010 ...
0
votes
4answers
123 views

Why do Vlans need routers to communicate?

Why do devices on two separate VLANs (Virtual LANs) implemented on the same switch require a router to communicate?
0
votes
0answers
27 views

Question about subnetting [duplicate]

If i have a network 172.16.100.0 /22, How can i subnet in in order to have 2 networks of 32 IP addresses 5 networks of 64 IP addresses 3 networks of 128 IP addresses 1 networks of 256 IP ...
0
votes
0answers
8 views

Given an IP address and a subet mask, how do I find the max number of subnets and usable host IP's? [duplicate]

my question is based on an IP address and a subnet, how can I find the maximum number of subnets and the number of usable host IP address per subnet. This is all IPv4 if that helps. For example if I ...
22
votes
8answers
4k views

Why can't devices on different VLANs, but on the same subnet, communicate?

I have a question about switching. I have two devices connected to a switch with IP addresses 192.168.5.20 and 192.168.5.10. Both devices have the same prefix, /24. That means they are on the same ...
0
votes
1answer
45 views

Confused about subnet masking [duplicate]

I've been reading up on CIDR and subnet masking and I am having a hard time figuring it out. I stumbled upon this question, and even though I have the solution I cannot figure it out. Consider a ...
3
votes
3answers
432 views

Do VLANs within a subnet need to have their own subnet for router on a stick?

I have been creating a network lab in packet tracer for practice. I have 3 vlans in subnet A and I am trying to configure router on a stick at gig6/0 on the bottom left of the image. Do I need to ...
2
votes
1answer
41 views

Cisco ASA 5505- My subnet mask is different from Show Route

While I was troubleshooting a DNS issue on my 10.10.10.0/30 subnet, I noticed the Local (L) and Connected (C) has different values. I configured the 10.10.10.0 network to use 255.255.255.252 has the ...
0
votes
0answers
12 views

Subnetting help [duplicate]

I am sorry if this is a simple question, but I am a little overwhelmed and I can't seem to grasp what I need to do. Long story short, I took over a network that was poorly designed in my opinion, but ...
0
votes
0answers
20 views

Unable to calculate for subnet mask [duplicate]

My question is - To divide a class C network into a maximum of 14 subnets each capable of having up to 14 hosts, the subnet mask used should be .. what and how ?
1
vote
1answer
37 views

Help with network setup [closed]

I have the following situation: Router 2 is a given. It is used by several people to go on the internet ('People we don't trust'). We are a tiny company that is supposed to go on the internet ...
5
votes
2answers
764 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
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 ...
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....
3
votes
1answer
61 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
81 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
35 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
25 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
36 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
132 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 ...
19
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
51 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
59 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
61 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
173 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
47 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
202 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
52 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
108 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
62 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 ...