Questions tagged [subnet]

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

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How to assign 2000 addresses starting from 198.16.16.0? [duplicate]

This problem comes from Tannanebaum's CN book and the full description of it is as follows: A large number of consecutive IP addresses are available starting at 198.16.0.0. Suppose that four ...
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2answers
106 views

please explain to me [closed]

so at our company we use a program for people to track vehicles but you see the only way the people can get access to this program if the subnet mask is 255.255.254.0. and when i put the ip on dhcp it ...
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167 views

Can two networks be part of the same third octet subnet?

Can two networks be part of the same third octet subnet? If both networks are connected to their own respective links, then could their addresses all be a part of the third octet subnet? Say a ...
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768 views

How to combine multiple subnet

I want my clients to use a /19 subnet but want them divided along 4 /21 subnets: /21 for servers, printers and so on /21 for LAN clients /21 for WLAN clients /21 vor VPN clients The subnets for ...
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2answers
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Help with Subnetting and Subnet Masks [duplicate]

I have to split up a network into 11 subnetworks, and then those networks must be split up further. With the address 136.192.0.0\16: I found that I have 2^(32-16) = 65,536 available addresses. I ...
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IP address Question, IP given by ISP [duplicate]

How many IP address in 197.210.152.14/30 If im correct, its just 1 > 197.210.152.14 Gateway is 197.210.152.13
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2answers
71 views

Why my computer subnet works like this? [closed]

When I type "ipconfig" within my command line, I get this thing: IPv4 Address. . . . . . . . . . . : 10.100.102.6 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . ....
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495 views

How does a browser understand a subnet mask in IPv4?

I am a newbie in network engineering. Now, I want to know how a browser understands a subnet mask in IPv4. For example, 78.39.197.180 with 255.255.0.0 is a unique address, and 78.39.197.180 with 255....
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3answers
220 views

Is it possible to use NAT with IP Subnetting?

if i have an organization and say i need about 25 Networks and 500 Hosts , well i'm going to use IPsubnet with CIDR To configure my ip addresses , what is the point of using NAT here ? , is it even ...
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1answer
135 views

Confusion in calculating the network address (Tricky One) [duplicate]

I have a problem in understanding the network address when calculating it from an IPv4 address and the subnet mask. IP Address: 192.168.10.131 | 11000000.10101000.00001010.10000011 ...
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2answers
261 views

subnet masking related confusion [duplicate]

I am new to subnet masking. I have a question. If network address is 10.10.10.0/23, what will be the first and last usable IP address of this network?
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219 views

How many hosts are in the following IP? [duplicate]

Honestly, I just know some basics about subnetting and hosts, but how can you determine how many hosts would be in the following IP 10.10.0.0/22?
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181 views

single network with two routers

I want to set up a wireless router to connect wireless devices with the rest of the network. I'm no specialist, so I'm not sure how to ask this question. I want the devices in the sub-network to be ...
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4answers
237 views

Can masked octets in network adress still be used?

I've come around following example in TCP/IP illustrated: Figure 2-3. A site is allocated the classical class B network number 128.32. The network administrator decides to apply a site-wide subnet ...
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1answer
41 views

How can I test if the subnet mask and default gateway are set for a device? [closed]

I understand how subnet masks work mechanically and how to convert from the mask to the CIDR bits notation, and I understand the concept of a default gateway. What I don't understand is what setting ...
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46 views

How can I set up two sub networks that can communicate by LAN but where only one has internet? [closed]

With only two routers, where one has a connection to the internet, is it possible to set up a second sub network that has no access to the internet, but where devices connected to either router can ...
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1answer
35 views

Can an host on a subnet comunicate via an host on a segment of the subnet? and viceversa?

It's a theory only question. An host on 192.168.0.0/16 can comunicate with an host on the subnet 192.168.1.0/24 ? And viceversa? If no, why? NOTE: I already CAN calculate host, subnet, network id, ...
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1answer
40 views

What IP addresses are appropriate for a network inside an embedded device? [closed]

I am making an embedded device with two processors, a "gateway" processor which is connected to external ethernet, and a "webServer" processor, which is only connected to the ...
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2answers
316 views

can LAN port have multiple IP addresses of same subnet mask or different subnet mask

Can the router's ethernet interface have multiple IP's of the same subnet or different subnet mask? If yes what's the use?
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Benefits of subnets in networks with externally hosted services

I'm a computer science teacher trying to understand the benefits of subnets. I understand how subnets are defined and how it can be determined using a subnet mask whether two hosts are on the same ...
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1answer
26 views

Connecting industrial devices to OPC server while keeping segregation [closed]

We have two industrial machines (let's call them Holding and Media) with configured network addresses 192.169.0.122 and 192.169.0.123 respectively. Currently they are isolated physically although ...
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1answer
44 views

directed broadcast ping on overlapping subnets

I have a router with 2 hosts connected to it. R: 192.168.0.1/24 host 1: 192.168.0.9/28 host 2: 192.168.0.15/24 Host 1's directed broadcast IP is the same as host 2, so what happens if host 1 pings 192....
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"Destination host unreachable" when pinging a pc from another network

I tried to build a simple network in Packet Tracer and I get "Destination host unreachable" when I try pinging a PC from another network. Pinging PCs from the same network works. When I use ...
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1answer
51 views

Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?

Well, it's just as the question states, Do subnets need a router between them to communicate or can multiple subnets communicate from within the same router?
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1answer
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Can i/how discover subnet CIDR from IP range? [duplicate]

i have found the IP range 120.76.0.0 - 120.79.255.255 that i want to ban in iptables the way i write x.x.x.x/xx format. Please how to know what that x.x.x.x/xx should be? I have found some online tool ...
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1answer
32 views

What are some techniques to infer the subnet being used? [closed]

Given a list of thousands of IPv4 addresses and that you have no direct access to these hosts, is there a service or a methodology to infer a subnet that's possibly being used?
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1answer
40 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
128 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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1answer
46 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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1answer
22 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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1answer
140 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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1answer
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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 ...
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1answer
2k 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 ...
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2answers
279 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 ...
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1answer
154 views

How to differentiate between classful network and subnet (beginner)? [duplicate]

I have just started learning from the ICDN1 official Cert book. I've just covered the concept of Classful Networks. However when introducing Subnetting, the example has me confused. It examples an ...
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1answer
569 views

Is this a valid network diagram?

I'm studing how to create a network diagram to this problem The problem is: 7 condominiums with 7 floors each one, each floor has 4 apartments The project is needed to use VLANs, Routers, DHCP, DNS'...
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1answer
52 views

What are "Unicast identity tokens"?

I was reading an introduction to IPv6 which talks about the depletion of IPv4 addresses. I came across the following line: As noted in RFC 5735 a number of address blocks are reserved for users ...
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1answer
120 views

Can't resolve hosts after adding manually setup DNS servers on windows machine [closed]

I have setup as shown in this picture. I configured a bind9 dns server on ubuntu (192.168.242.11) When I set this as the DNS server for the Test Machine, it can resolve hosts perfectly well. When I ...
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1answer
529 views

Packets stuck between two routers

I am trying to send a ping from one subnet to another in cisco packet tracer. The PC sends the packet to the switch, and then to the router of the same subnet via gigabitEthernet (192.168.24.1) and ...
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1answer
1k views

Difference between Vlans and subnets [duplicate]

What is the difference between Vlans and subnets? I don't mean the configure or structure
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2answers
132 views

Why the DHCP provide us our subnet? [closed]

I'm trying to learn the DHCP protocol and the importance of what he gives to the computers connected to him. If I send everything through the router, why I need the DHCP to provide me the subnet of ...
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2answers
188 views

Separate Subnet for Each Vlan? [duplicate]

Thoughts and Query I was tring to understand Inter-vlan routing and realised, that each exsisting vlan in the switch is configured with a different subnet. Is this is a good practice or is there any ...
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1answer
4k views

What is the Destination Address? [duplicate]

I have some doubt in the problem which follows: Suppose a host with IP address 19.121.202.123 wants to send a packet to all the hosts in the same network. Then, what destination address should it use?...
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1answer
64 views

Standard Gateway (Passive Network Partner)

Following scenario +-----------+ +-----------+ | Network A |--- Router ---| Network B | +-----------+ +-----------+ Question If a client in 'Network A' wants to connect to ...
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2answers
142 views

IP connectivity between hosts with differing subnet masks?

For instance, if switch A has hosts with mask /25 and switch B has hosts with /26. Will a ping from Host A to host B be successful? How does the situation change if: Both switches are connected to a ...
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1answer
105 views

Simple network mask question

I have a question about network masks. Host A IP : 10.0.0.1/24 Host B IP : 10.0.0.2/25 Why is PC1 able to ping PC2, but when PC2 tries to ping PC1, it times out? Can I get a detailed explanation? ...
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1answer
148 views

How to connect to a sub-net device from internet? Is it possible?

Example I mean the situation when you have web-host on your (sub-net cellular internet android device) and try to reach it from your (IP static broad-bond internet laptop) Problem As we all know ...
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1answer
129 views

finding maximum number of users in department [closed]

I have the next issue : A company has the network ID:192.168.10.0/24 , the company is composed of 10 department. What is the maximum number of the users in each department that can be covered by this ...
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1answer
1k views

Secure connect & access across 2 separate LAN Subnets using PFSense/ Sophos?

Secure connect & access across 2 separate LAN Subnets using PFSense/ Sophos? Following is an older diagram of a 2+1 level Small Business/ Startup + Co-working space, with recent expansion & ...
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1answer
3k views

What are the differences between classful and classless subnetting? [closed]

ip: 10.5.2.1 subnetmask: 255.255.255.240 {10.5.2.1/28} what is correct maximum subnetworks ???? What are the differences between classful and CIDR subnetting????

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