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Questions tagged [subnet]

A subnetwork, or subnet, is a logically visible subdivision of an IP network. The practice of dividing a single network into two or more networks is called subnetting and the networks created are called subnetworks or subnets.

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how to create subnet on lan that i want to hide behind vpn [closed]

not sure if this is the correct forum for this but i am trying to do something and im not sure how to go about doing it. I want to place a set of 4 vm's in my esxi server behind a private vpn. I ...
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Weird routing behavior between 2 Subnets

I have two Subnets and the Routing works like this: Client A can Ping (ICMP) Client B Client B can't Ping (ICMP) Client A There are no Routes manually configured in the Access Point (Google Wifi ...
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Network hierarchy with subnets

Is it possible to divide networks with subnets so that they intersect? My example is: Network A: only visible inside network A Network B: only visible inside network B Network C: visible from both ...
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IP Address and Subnet Address Validation

I am developing a code to validate that an IP and Subnet IP combination is a valid one. Say the IP address is 192.179.10.105 and its subnet mask is 255.255.0.0 - so what are the validations we can ...
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In AWS VPC subnet id changed

I deleted the default subnet in my VPC and tried to create new. After creating the new subnet it showed a different subnet id, as you would expect. When I try to create subnet group in RDS the ...
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Can I have EC2 instance within the same vpc have a different availability zone

I wonder if it is possible to have one single instance running in a different AZ than its peers within the same private subnet of another AZ. There is a database cluster private subnet in which my ...
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2answers
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Any reason not to use 10.X.0.0/16 subnets (VLANs) on SMB private network?

We are currently primarily using a 10.1.1.0/24 subnet at our small company (~250 employees, ~90 computer users). We're seriously considering doing some VLANing / network segmentation and isolation, ...
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AWS - VPC and subnet group

In order to create RDS, I need to create a VPC and two subnets attached to it. If I choose 10.0.0.0/16 as IPv4 CIDR for VPC, can you please suggest IPv4 CIDR blocks for the two subnets that I have to ...
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1answer
62 views

How to use subnet-zero ip address in practice?

I know that subnet-zero ip address refers to a subnet itself, while subnet-one ip address is used for broadcasting. How can we use subnet-zero ip address? Does any router have a capability to make ...
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26 views

Add an IPv6 subnet to Ubuntu server

I'm trying to add an entire /64 ISP-provided IPv6 subnet to an Ubuntu server machine. I'd like to be able to use any IP I want with curl (perhaps using --interface <ip>) after the IPs are ...
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88 views

OpenVPN clients with same subnet connect to server

Is there any way at all to connect possibly hundreds of IOT devices that have the same LAN IP (192.168.1.1) to one OpenVPN server? The devices have openvpn client preinstalled. I've been told it's ...
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How can i set up a PC as gateway from a local network to the internet?

This is a follow up question to this question. I want to configue a local network in a way that its clients use a server as gateway towards the internet. The OS on all clients and the server is ...
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How to bind a subnet explicitly to a specific interface using dhcpd

In reference to dhcpd, how does one go about binding a subnet explicitly to an interface like eth0 serves subnet0, eth1 serves subnet1? ubuntu 16.04 Thank you
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33 views

connect two pcs per lan

I have four PC´s, all of which have a OpenSuse 42.3 OS and are connected with a Lan wire. I now want to communicate with one Server-PC to the other three. I already gave all of them a Subnetmask of /...
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301 views

IPv6 Routing: Destination unreachable: Beyond scope of source address

I need a help with IPv6 routing, I have setup a Linux box with a IPv6 interface on eth2, and this interface is bonded with interface bond0 Details as below cat /etc/sysconfig/network-scripts/ifcfg-...
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dnsmasq boot-option for multiple subnets

I have a simple dnsmasq configuration that handles PXE for BIOS PXe as well as UEFI pxe and this works well. I need to add a second subnet and planned on using the same system to act as the DHCP ...
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Use cases for protected subnets

I'm reading through some blog posts and articles on aws vpc design to see if there are perhaps improvements to be made to a setup currently on aws when I came across an article making mention of "...
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1answer
54 views

VLAN/Subnet Design

I am trying to get my head around the practical implementation of VLANs/Subnets. I currently have 3 HP v1910 switches with the following subnets/VLANS; 192.168.20.0/24 Production Server (7 servers ...
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1answer
88 views

Move computer into ou

I have a customer that has 4 locations. We have 2 dcs in one of the locations. I want to create a domain that will separate computer objects by location. Sometimes a users will visit another location ...
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What does the netmask in an IP address actually tell you?

There are several questions out there asking what the CIDR netmask is, and how it's calculated. But after reading all the top answers, I'm still left wondering, how does the netmask let us distinguish ...
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What happens if several clients in the same subnetwork request the same asset to a WebRTC based CDN?

Basically, I wonder how the traffic is routed when several (let's say up to 30) clients, all using the same gateway and being in the same wifi sub-network are requesting the same asset to a WebRTC ...
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Samba File Server sharing over multiple Switches/Subnets [duplicate]

I have a raspberry pi with a configured samba server to share a harddrive attached to it. I tested the server inside a single subnet and since that worked I now need to integrate it into the server ...
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407 views

What IP addresses are included in a subnet “range”?

I'd like some help understanding subnets (CIDR). I'm using a tool to check if an IP is in an acceptable range given a CIDR address. When I input an IP address (12.245.105.190) and check it against ...
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38 views

How do I talk to a machine with the same IP as me but on a different subnet?

Suppose I am on one subnet and I want to send a message to another machine on a sibling subnet that has the same IP address as me. What is the syntax, conceptually and practically, to get my message ...
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62 views

How do I stop a server on multiple subnets using SMB responding from a different IP address?

I am having a problem in our network where some computers are having extremely problematic and slow connections to our Solaris 11.3 server. The problem seems mostly limited to computers running macOS,...
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775 views

Allow internet access for ec2 instances with private IP addresses inside a public subnet?

I have a public subnet(S1) with a route pointing to the internet gateway in its route table. Launched an ec2 instance(I1) inside S1 but did not allocate a public IP to it, thereby the instance only ...
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178 views

Connecting a server in a private subnet from a server in the public subnet

I created 2 subnets in one AWS VPC. One of them has an internet gateway for routing. The other has a NAT gateway. I launched 1 instance into the public subnet with a public IP address and the other ...
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Windows Server 2016 - Multiple NICs - Isolation Issue?

I have a SCADA server running Windows Server 2016 with 2 NICs configured to grant access to separate networks, which I need to stay isolated from each other. NIC 1 exists on the main local network ...
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1answer
47 views

Accessing a machine in a different subnet with a persistent route

the IP address of a windows computer is 172.16.56.109 with the subnet of 255.255.240.0 which is set by a DHCP server. On the other hand, I want to access to another computer with IP 172.20.54.10 and ...
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1answer
20 views

Accessing different networks with different subnets from one main network

I have multiple branches with their own NBN connections and routers, i would like to put each one on a different subnet (192.168.2.*, 192.168.3.* and so on) just for sorting reasons, they do not need ...
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Why would I get ping replies from a private IP outside of my subnet?

I have a computer with 2 network adapters, each on its own subnet. One is our private LAN, 192.168.1.0/24, the other is for the internet. The internet subnet is 10.251.85.161/27. When I ping-...
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Why does my network traffic appear to not go through what my router calls my “WAN default gateway”? [closed]

Bear with me a bit as I might be completely misunderstanding something. I'm a very-early-in-education networking student and at the moment I'm tinkering with my router settings while studying. I ...
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2answers
683 views

DHCP relay through different subnets

A TP-Link W8980 acts as a DHCP server on 192.168.0.0/24 subnet. This is also the only wifi access point. A Zyxel USG 50 is connected to it through its 2 WAN ports and has static addresses 192.168.0....
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48 views

What is the benefit of having two subnets, public and private, in a VPC, vs not having a public IP in a public subnet?

Scenario 2 of the VPC guide on AWS (here) shows how to set up a public and private subnet. To quote: We recommend this scenario if you want to run a public-facing web application, while ...
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I need to connect 2 switches to a router, what's the difference between creating 2 subnets and creating 2 “normal networks” with their own net ip?

I'm really confused about subnets right now, basically I have two separate networks that I need to connect to the same router and I need to explain how they are connected together, IPs, et cetera but ...
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Server 2012 R2 port forwarding through different subnets

I maintain a small network of a number of hosts.. connected to the net on dsl with a cisco 867vae, immediately behind it is a server at the centre running 2012R2, acting as monitor/router/dhcp/RADIUS ...
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1answer
139 views

Does Windows prevent automatic NTLM authentication when the SMB server is located on a different subnet?

I have a Samba server[1] on my network with a share configured[2] to allow access for my Windows logon user. I can access the share from the Windows 10 machine that hosts the SMB server VM without ...
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1answer
103 views

juju add-subnet fails - missing subnets in new model?

I am following this blog post to create kubernetes in existing AWS infrastructure: https://insights.ubuntu.com/2017/02/08/automate-the-deployment-of-kubernetes-in-existing-aws-infrastructure/ $ juju -...
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2answers
88 views

In the routing decision, why is only the source's subnet mask used and applied to both source IP and destination IP?

A subnet mask defines how an IPv4 address is broken up. IPv4 addresses nnn.nnn.nnn.nnn aren't like MAC addresses in that they are just random numbers. That defeats the purpose of Routing. They have ...
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1answer
2k views

How can I define static routes between two subnets in OpenWRT / LEDE?

Migrated question here according to this. This is for hotel wireless coverage. What I need is explained here for DD-WRT, but I am using OpenWRT and LEDE. I need to make routes (gateways) to between ...
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1answer
70 views

How to set up access between different subnets in sonicwall?

This is Network map. Sonicwall TZ 215 wireless-N SonicOS Enhanced 5.9.1.5-16o X0(LAN):192.168.0.252 X1(WAN):192.168.0.253 X4(LAN):192.168.32.1 Now,I want to using a 192.168.32.x device ...
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2answers
34 views

Connect to machine that is behind another machine

I have the following setup LAN setup (All machines are running Slackware 14.2): INTERNET | | 192.168.10.1 +----------+ ...
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2answers
86 views

wierd arp issue with 2 interafces sharing same subnet

I have two linux machines connected through a switch. bothe machines run linux RHEL 7.3 kernel 3.10.0-327.el7.x86_64 one of the machines is connected with both ports to the switch and the other with ...
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2answers
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How does VLAN subnetting work on IPv6?

I have a network with about dozen VLANs, most with inter-VLAN routing, some without. They might talk to each other but not to the other's gateway. It's not divided because of security or congestion, ...
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102 views

How can I send the same traffic to two different VLANs on the same subnet? [closed]

We have a data feed coming into a single Linux server (CentOS 7). We need this server to forward all the data to two different VLANs with the same subnet. We currently have software running on the ...
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1answer
49 views

Routing Windows guest VMs behind a NAT to multiple connected networks on the host

I've configured Windows Server 2016 with the Hyper-V role. The host machine is connected to two networks: 10.101.8.0/22 (dept.local link-local only network) 10.13.80.0/24 (ad.company.com internet-...
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0answers
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How do I calculate a CDIR that's within the range of another CDIR? [duplicate]

I'm setting up VPCs for multiple regions in AWS. However, I'm stuck at calculating the CDIR when I want to add another subnet. Let's assume I have a CDIR of 10.0.0.0/16. How do I calculate a CDIR ...
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1answer
1k views

Why does this allocation of client static IP in OpenVPN fail?

I am running an OpenVPN server, and I want to assign a specific client a static IP. This is my server.conf. I think this configures the pool of virtual IPs to span from 10.5.24.209 to 10.5.24.223. ...
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1answer
82 views

How do I determine what IP range to use given how many hosts and networks I want? [closed]

I need to figure out this question, but I do not know how to go about it. I am new to subnetting, and this is a question on my Microsoft Networking Security Fundamentals assessment: The IT director ...
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1answer
108 views

Blocking or rate-limiting IPv6: what size prefix

Given that blocking a single IPv6 address would seem to be somewhat pointless as an end user typically has at least 2**64 of them, we need to block a range, which identifies a "site". A "site" in ...