Questions tagged [subnet]
Questions relating to IP subnetting, including planning, calculation and best practices.
521
questions
1
vote
1answer
50 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 ...
-1
votes
0answers
12 views
How do i create 12 subnets of different sizes with the ip address of 192.168.10.0 [duplicate]
You were requested to provide subnet masks to meet the requirements (12 subnetworks) as below.
What subnet mask do you require for each subnet type?
Q2: What subnet mask is required as minimum to ...
0
votes
0answers
11 views
Resolving IP Address Conflicts with VLAN [closed]
Preface is that I am not a network administrator but I have taken over a project deploying an integrated system to an industrial environment which interfaces with existing devices. As such apologies ...
-1
votes
0answers
14 views
Understanding subnetting [closed]
I understand how subnetting works but i don't understand how it fits in my everyday life. I have few questions
1.does only ISP's subnet networks or even private ips are subnetted ?
2. If my public ip ...
0
votes
2answers
43 views
Can a host from different subnet bypass the network mask validation of destination host and communicate on layer 2?
I am aware that a host will always check the subnet of the destination node before the transmission in order known if it has to send it to the gatewey for different subnet.
However, would it be ...
-1
votes
0answers
16 views
Finding Subnet and Network addresses [duplicate]
As a Network Support Engineer, you are tasked by your Supervisor with assigning IP addresses for your new MAN( Metropolitan Area Network) which consists of seven (7) different branches, each branch ...
0
votes
1answer
20 views
Additional subnets in a class C IP [duplicate]
If i'm designing a new subnet mask for a class C IP that will have 5 subnets that means I need to borrow 3 digits since 2^3-2 > 5. My question is, how many additional subnets do we have?
would it be ...
0
votes
0answers
21 views
Subnetting for this question, please? [duplicate]
As a Network Support Engineer, you are tasked by your Supervisor with assigning IP addresses for your new MAN( Metropolitan Area Network) which consists of seven (7) different branches, each branch ...
1
vote
0answers
15 views
Split a Netmask into little chunks [duplicate]
I would like to know how I could divide a Netmask like 255.255.255.192 in 8 parts.
Would it be something like this:
255.255.255.192
255.255.255.128
255.255.255.0
I'm really confused.
0
votes
1answer
24 views
Default subnet question [duplicate]
Very new to network engineering. I just watched a really good series of videos on YouTube explaining IP addresses, subnet masks and the class system for IPv4.
There was one bit which got me confused ...
0
votes
2answers
38 views
Multi LAN network does the main router to the internet need to be in its own subnet?
I have to design a network where there are 4 within which are different number of VLANs with varying number of hosts per VLAN depending on the building.
My confusion lays in the main router, does it ...
0
votes
0answers
9 views
Determine the range of IP's avaliable for hosts on a subnet /28 [duplicate]
I am looking into my Virtual Switch configuration( Hyper-V ) and i am confused how the range of valid IP's is determined.
The IP for configured for the "Virtual Switch" adapter is:
IP: 192.168.53.65 ...
1
vote
2answers
36 views
What is the suitable private IP? [duplicate]
What is the private IP that I may use if I am about to subnet a total of 743 hosts in my office? Should I use 10.x.x.x, 172.16.0.0 - 172.31.x.x, 192.168.x.x or all of them are allowed? Also if more ...
0
votes
0answers
8 views
Does 10.10.192.0/20 represent the same number of address with 10.10.195.0/20 [duplicate]
I knew 10.10.192.0/20 can represent the ip addresses from 10.10.192.0 to 10.10.207.255, but I'm confused how does 10.10.195.0/20 represent? I guess it is same with 192.0/20 right?
0
votes
0answers
13 views
CIDR notation confusion [duplicate]
So we are using CIDR for subnetting
In that we just define the subnets by using /
SO my question is if I am using /24 it means that I have the last octet for host.
But if we use anything from /17 to /...
0
votes
0answers
18 views
Are network IP addresses ever used as source or destination IPs? [duplicate]
The first IP address of an IP subnet is the network address, which stands for the whole network, while the last address is the broadcast address.
As far as I understand, we never really send packets ...
1
vote
1answer
144 views
Broadcasting to unknown Class C Network
I am trying to use python to broadcast to my local network, and I cannot find a way to get the subnet mask. I have been suggested to use the default Class C network subnet mask 255.255.255.0, and use ...
1
vote
2answers
45 views
Where are broadcast packages filtered out
When I have one network with a switch. Within that network I have 10 PC. Halve of them are configured within the 192.168.1.0/24 range and the other halve is configured at 192.168.2.0/24.
This means I ...
0
votes
1answer
38 views
Find Routes not containing these subnets [closed]
Let's say I have 1000 ranges and I would like to make routes that doesn't match these ranges, anyone has any particular tips or tools to share beside doing math ?
Example :
I have these ranges
13....
1
vote
2answers
39 views
Why does the host machine need subnet mask? [duplicate]
The routers require subnet mask to route the packets to other routers or hosts, but why do host machines that are not routers such as computer running Ubuntu or windows need subnet mask to be ...
2
votes
1answer
63 views
Why Classful addressing is not in use if we can subnet them?
So,
Let's think that organization needs 5000 IP addresses. Giving 20 C Class IP addresses will cause of adding 20 entries for ISP router. That's problem. We could give Class B IP address, but that ...
1
vote
2answers
57 views
Whats the proper way to write subnet size with / notation?
If I need to write a Subnet mask in /x notation, would it be correct to take the subnet id/X
or the broadcast ip/x?
I.e. for a 256 IP subnet: 10.10.0.0/24 or 10.10.0.255/24?
0
votes
0answers
19 views
How to find minimum of hosts bits needed and assign equally to five subnets? [duplicate]
I have a 192.168.1.0/18 network block. How do I determine the minimum number of host bits to be borrowed and assigned equally to five subnets? How to calculate the number of users that can be ...
1
vote
1answer
66 views
Are subdomain and subnetting related concepts?
Recently while trying to grasp some basic networking concepts - I felt subdomain and subnetting are related concepts and wanted this group to confirm and add more insights on this.
I understand that ...
0
votes
0answers
10 views
Can someone walk me through subnetting? [duplicate]
I'm trying to find the number of bits for subnet and the number of bits for hosts:
The assigned network is: 10.0.0.0/8
The subnetted network is: 10.0.0.0/15
I have tried to do it, but I'm not sure ...
0
votes
2answers
65 views
VLAN based subnets, where should I untag a VLAN?
I have attempted to search this problem but I don't really know how to explain it properly (possibly a sign I've taken on more project than I can handle).
Anyway I am currently working on chopping ...
4
votes
5answers
2k views
How does a host in one subnet know to forward the packet to the router MAC, when trying to send a packet to another subnet
I am trying to understand the ARP protocol and I could not understand the above. Consider the topology as follows:
H1(1.1.1.1) - (1.1.1.0)R(2.2.2.0) - H2(2.2.2.2)
My understanding is that if the ...
1
vote
1answer
40 views
IPv4 Subnetting for 1200 or more devices for WiFi
I am currently looking over my schools existing Subnets and their usage. Some seem to be sufficent, others not so much.
What is the best practice when you need to support 1200 or more devices on a ...
0
votes
0answers
9 views
Given a subnet mask, how can I determine which addresses can be assigned to public network hosts? [duplicate]
For example, I'm given a subnet mask of 255.255.255.248 and need to determine from a list -
16.70.118.63
134.178.18.56
200.47.224.159
68.111.178.93
192.168.16.87
217.37.10.192
- which addresses can be ...
0
votes
1answer
67 views
Why is this subnet config required by my vlan “snake topology”?
I must validate the bandwidth on all 8 ports of a switch. We intend to do this with a "snake" topology as described in this article: http://thenetworksherpa.com/test-throughput-alchemy-using-a-snake-...
2
votes
2answers
208 views
Can a single subnet work across several switches?
New to networking and studying hard but limited access to a kit to try things at the moment...
My question is - if I had, for example, two Layer-2 switches cable connected, could I have devices on ...
0
votes
0answers
13 views
Which mask to use for 1024 address size subnet [duplicate]
I am trying to identify if given IPs are from same 1024 SUBNET.
192.168.3.1
192.168.2.19
192.168.1.1
The part I got stuck is that SUBNET address size is 1024.
If I am sure, by checking IP addresses ...
1
vote
1answer
68 views
Sonicwall: force all traffic from specific source through VPN
We have a main office (M) with a Sonicwall TZ215, and a branch office (B) with a TZ210.
Computers in B access the server in M through a site-to-site VPN between the two Sonicwalls. Internet traffic ...
0
votes
0answers
20 views
Give the 36th subnet for given network [duplicate]
Given network is: 148.47.0.0/16,
give the 36th subnet where you can uniquely address 54 hosts.
Where to start? Thanks in advance.
0
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2answers
167 views
VLANs vs subnets pros and cons
What are the pros and cons of designing an entire network using VLANs rather than design the network only using subnets?
0
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0answers
11 views
How to divide an IPv4 network into three separate networks? [duplicate]
I have an address of 192.168.100.0(/24) and I need to separate it into three networks using VSLM. One needs 70 hosts, another needs 30 hosts and the last needs 25 hosts. What is the most efficient way ...
5
votes
3answers
511 views
CIDR and VLSM what are the differences?
CIDR improves the allocation of IP addresses. VLSM allows to define a subnet as we wish. Can CIDR used without using VLSM?
2
votes
1answer
54 views
How is traffic correctly routed in Site-to-Site VPNs where all sites are on the same subnet?
http://rockhoppervpn.sourceforge.net/ref_site2site_bridge_6.html
The diagram on this page shows all 3 sites using the same subnet, 192.168.0.0/24. Let's say on the hub site where 192.168.0.10 is the ...
0
votes
0answers
18 views
How can a class b network with a cidr of 24 contain 254 networks? The third network IP octet is masked [duplicate]
class b network 172.16.31.0/24 with a mask of 255.255.255.0 contain 256 networks? the only range is
172.16.31.0 to 172.16.31.255 or are you saying that there can be 256 networks e.g
Network 1 172.16....
1
vote
0answers
10 views
Can only same-sized networks be combined? [duplicate]
On multiple channels a "rule" is that only same sized networks can be combined. But this is only a valid constraint, if the subnet mask needs to remain the same as of the nets to be combined, correct? ...
0
votes
0answers
19 views
How to calculate subnet mask including, network address, gateway, broadcast address and host range? [duplicate]
You are defining network boundaries within a /24 network of 172.30.20.0/24. Please complete the segmentation of the /24 to account for multiple smaller networks of 115, 50, 28, 12, and 5 hosts. ...
0
votes
0answers
13 views
Split to four equal size subnets [duplicate]
Question;
Suppose an ISP owns the block of addresses of the form 128.119.40.64/25. Suppose it wants to create four subnets from this block, with each block having the same number of IP addresses. What ...
0
votes
0answers
15 views
About relation of ip adresses and number of hosts [duplicate]
Question is;
https://imgur.com/9nKqRgE
I am not sure about the answer but my thinking is that if there are 35 hosts then 2^x=>35 after that i find x is 6
it means 6 zero we have on subnet. and ...
0
votes
1answer
43 views
Setting the network address freely [duplicate]
I'm trying to understand IP Addressing, but there's something what's still not clear for me.
With mask
1111111.1111111.1111111.00000000 (/24)
Am I able to set network address "freely" like this?
...
0
votes
0answers
16 views
ARP traffic for devices in same LAN but different subnets [duplicate]
Given a LAN with 5 devices (a,b,c,d,e). Where devices a and b are in one subnet and d,e,f are in another. Will an ARP request broadcasted by a looking for device b reach devices d, e ,f as they are ...
0
votes
0answers
13 views
How to calculate bits needed for host, bits left for network, number of available networks? [duplicate]
I have a class b address of 145.14.0.0
I need to create a scheme where each subnet accommodates 2259 hosts.
can someone explain step by step how to do that
0
votes
3answers
69 views
TTL And Wildcard mask
I have two questions that i wanted to ask before.
What is TTL?!
I know that it's time to live for packet to die it count how many hops you jump in it every icmp but i don't know how it works and what ...
5
votes
6answers
3k views
packet routing between subnets on same vlan
I am trying to understand how packets are routed within the same VLAN. I understand that typically there should be a 1:1 mapping between VLANs and Subnets. However if i deploy the following ...
1
vote
3answers
120 views
What is the intuition behind subnetting a base IP?
Take a look at this picture:
My professor usually gives a topology like this and gives me a base IP. Let's say the base IP given is: 223.1.0.0/24. We're then asked to construct the given topology by ...
3
votes
2answers
115 views
Is the first address in an IPv6 subnet assignable?
I am working in a lab and have configured a series of /125 subnets between routers. Lets ignore the best practice for this discussion of using /64 for everything.
When I assign fd00:f9a8:ffff::257 to ...
