Questions tagged [subnet]

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

Filter by
Sorted by
Tagged with
0
votes
2answers
45 views

Meaningless bits in CIDR notation

Is specifying meaningless bits valid syntax in CIDR notation? For instance, the netmask of 192.168.13.0/16 is 255.255.0.0. In this case, the last two octets (00001101 00000000) are meaningless because ...
1
vote
1answer
37 views

Broadcast link vs. point-to-point links

What is the distinction between broadcast links and point-to-point links? In the paragraph below, the author switches between "broadcast link" and "broadcast network" which is causing my confusion..is ...
1
vote
2answers
56 views

How to do subnetting on IPV6 for non nibble boundaries?

As I was reading this article on How to: calculating IPv6 subnets outside the nibble boundary https://blog.apnic.net/2018/08/10/how-to-calculating-ipv6-subnets-outside-the-nibble-boundary/ The author ...
0
votes
0answers
17 views

Can you get more than 128 hosts with /25 mask? [duplicate]

I had an exam, and we were given an IP 199.177.63.0/25 and were asked to create two subnets of 66 and 10 hosts. Would first subnet already take 128 addresses? Sorry for stupid question.
0
votes
0answers
15 views

How do I find the number of IP addresses between two given IP addresses? [duplicate]

How would I find the number of IP addresses from 224.65.0.0 to 225.127.255.255?
0
votes
2answers
71 views

Why can't we have duplicated IPs?

This may be a really dumb question, but I like to turn upside down what I already know sometimes, that way I can learn more. For example, given a network 192.168.0.0/24, I have a device inside with ...
1
vote
2answers
29 views

How many public static ips do one need if a PC is behind a wireless router?

If a PC is connected to internet through a wireless router. How many public static ips do one got to get from the ISP. Do the router and PC both require one static IP. What if I want to add more PC ...
0
votes
0answers
19 views

How is it possible to create 6 subnets? [duplicate]

The following task presents me with an insurmountable obstacle... Given is the following: IP: 192.168.40.0 Subnetmask: 255.255.252.0 Task: Form 6 subnets over this network and enter ...
0
votes
0answers
15 views

Finding number of host and network [duplicate]

Can someone explain to me how to do this homework question. I am confused on whether it should be 1022 host or 1022 networks: I allocate 10 bits as subnet number to identify a physical network, then ...
0
votes
1answer
15 views

Varible Length Subnet Masking - Smaller subnet with two larger subnets on each side?

Background: I'm redesigning a network of virtual machines. The virtual machines are all on 10.0.2.0/24 and 10.0.3.0/29 networks, the physical network is a 172.32.255.225/28 network, which stands ...
3
votes
4answers
130 views

Carving out a /28 network and still maintaining access to parent /24 network

In the diagram below, I'd like to carve out a /28 network from 192.168.0.0/24 and move it to another geographical location and still maintain access in and out of the original /24 network. ...
0
votes
0answers
14 views

What would be the router's gateway IP address that is connected to a network containing two smaller networks [duplicate]

Assuming that we can use any available public address, we have two separate subnet masks 255.254.0.0 which contains 131,070 usable addresses (IP range 126.240.0.1-126.241.255.254) and 255.255.128.0 ...
0
votes
0answers
22 views

class B Network subnetting Clarification [duplicate]

can anyone help on network subnetting, A class B network the ip address is 128.211.0.0/16 which means the subnet mask is 255.255.0.0 i want to create 20 subnet network from that the IP address 128....
4
votes
1answer
74 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
40 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
2answers
46 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
vote
0answers
98 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
39 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
vote
1answer
31 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 ...
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
139 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
9 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
48 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
450 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
44 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
41 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
769 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
82 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
148 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
36 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 ...
3
votes
1answer
28 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
161 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
45 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
68 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
61 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.