Questions tagged [subnet]

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

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126 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 ...
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Configure SMTP/HTTP/FTP Server on level 3 network [closed]

I am an electrical engineering student, following training on networking basics/security. As an exercise, I need to design a network for my university. It has three campuses which are far apart which ...
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2answers
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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 ...
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1answer
36 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....
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2answers
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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 ...
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What is the network address of 5th subnet where per subnet allows 16 hosts [duplicate]

For an IP 150.60.0.0/16, I need to find out the network address of the 5th usable subnet where each subnet allows 16 hosts. Subnetting or VLSM which one is to use?
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1answer
51 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 ...
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2answers
51 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?
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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 ...
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1answer
49 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 ...
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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 ...
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64 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 ...
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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 ...
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1answer
38 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 ...
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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 ...
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58 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-...
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2answers
114 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 ...
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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 ...
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1answer
44 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 ...
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19 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.
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96 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?
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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 ...
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3answers
253 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?
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1answer
52 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 ...
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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....
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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? ...
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17 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. ...
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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 ...
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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 ...
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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? ...
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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 ...
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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
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3answers
67 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 ...
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6answers
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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 ...
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3answers
118 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 ...
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2answers
91 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 ...
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1answer
78 views

how to get the smallest summary route? [duplicate]

i am practicing subnetting, then i got this question from the web. then the answer showed up as 172.16.0.0/12, i am puzzled right now how did that happen. please if anybody out there can explain to ...
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1answer
74 views

How to interpret subnet mask [duplicate]

I received a datasheet with which I need to configure a server that doesn't do dhcp but rather needs to use a static IP address. The sheet tells me to set the subnet mask 255.255.252/22. I tried to "...
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3answers
393 views

Cisco ASA 5512X does not allow connections across VLANs to internet

First time doing a network, I'm a software guy normally. I am setting up a network to share and internet connections to multiple properties. The goal is to segment each property onto its own VLAN. I ...
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2answers
163 views

How does aggregate routes behave in BGP?

If a router received two BGP updates for the same prefix and both these updates are aggregate paths how do the router decide which one to take? Let us say that it needs to decide based on AS Path ...
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4answers
5k views

Why is 10.1.255.255 an invalid broadcast address?

I’ve been following the CCENT official certification book(100-105) and came upon this question in the “do I know this already?” quiz. The books only covered /24 subnetting only so far. Which of the ...
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2answers
56 views

How To Route Private Subnet Traffic To Internet Via Public Subnet In The Same AWS VPC?

This scenario is simple, created a VPC (CIDR > 172.16.0.0/16) in AWS Management Console, created 2 subnets in it. Public (CIDR > 172.16.1.0/24) Private (CIDR > 172.16.2.0/24) Public route is set on ...
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2answers
65 views

Different Wi-Fi security levels under same private subnet

I'm working on an assignment and I'm given a hypothetical scenario where: A company has a local subnet where everything shares the flat address space 192.168.0.0/8 (this means that any device can ...
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1answer
35 views

VPN to a current subnet ID

I am sure this is a fairly basic question, but the standard google searches have not told me what I am looking for. I have a restaurant that uses an ipad point of sale on a dedicated subnet id: 192....
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3answers
73 views

Bridges, hubs, switches and repeaters in subnetting

I'm learning to subnet and I'm constantly doing exercises on paper about this topic. I'm trying to breakdown a network into smaller subnets, given the number of hosts for each one. For now, I only ...
2
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1answer
43 views

Different sized subnets [duplicate]

I am not sure the wording to search for and therefore this question has probably been answered before and i just cant find it. I am puttiing together a small WAN and im using /29 addresses for the ...
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2answers
21 views

Can 2 Directly connected PCs having the same network ID but different subnet mask talk? [duplicate]

If Pc1 has IP 192.168.10.2 / 24 ---> Network ID : 192.168.10.0 and Pc2 has IP 192.168.11.3 / 23 ---> Network ID : 192.168.10.0 directly connected (no switches no routers). Why cant i ping? But if ...
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1answer
17 views

Connect VPN with same Private Network [closed]

i have my Private Network on my Apartment that is 192.168.1.x/24 and in the Office we have Private Network 192.168.1.x/16. Is it possible to connect them through VPN, but i will not change my private ...
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2answers
74 views

In making network changes how would mixing sub nets affect the network

Will hosts with IP address manually assigned as 192.168.0.10/24 or 192.168.1.11/24 continue to function. When the router, DHCP, and switches are now setup to work as 192.168.0.0/22. We in inherited ...
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1answer
63 views

IP address source and destination translation without a gateway

I have a private network (no gateway) with a number of devices configured on one subnet (say A.A.A.0/24). I would like to change the IP addresses of all devices on this network to a new subnet (say B....

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