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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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TCP communication on port not responding on different Availability Zone or Subnet

I'm a little curious and confused about this situation. We setup a monitoring instance scraping an exposed endpoint on 2 different instances. Both on same VPC, same security group, same route table ...
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How to access Public VM IIS from internet in AZURE?

I have below things: 2 VM inside 2 subnet all are in Vnet1. VM1 has enable IIS, VM1 and VM2 Assign public IP. VM1 has assign public IP and I need all traffic from public IP of vm1 from VM2. INTERNET &...
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CIDR Address is not within CIDR Address from VPC

I have created a custom VPC with CIDR of 10.0.0.0/27 I want to create 2 subnets for IPv4 block sizes must be between a /16 netmask and /28 netmask. Not able to get correct for /16 and /28 I am ...
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What is the difference between 0.0.0.0/0 and 0.0.0.0/1?

In the history, I mostly used 0.0.0.0/0 for "match every IP address". Recently, I saw a 0.0.0.0/1 subnet filter. What is the difference between 0.0.0.0/0 and 0.0.0.0/1 and what's the ...
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Make a remote host have a local IP address with ARP capability(Steam Link) [migrated]

Currently I have two subnets in the 10.0.0.0/16, which are 10.40.20.0/24, let's say that's A and 10.32.80.0/24, B. My PC is in the subnet A and what I'm going to do is use Steam Link, Oculus Air Link ...
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Why would you use 192.168.0.0/16 over 10.0.0.0/8 [closed]

Most home networks use 192.168.x.0/24. I wonder why this range even exists. You could as well use 10.x.x.0/24 or something like that. So why did they waste the entire 192.168 range for private ...
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Migrating DHCP clients to new subnet using DHCP superscope?

I am migrating our dynamically addressed DHCP clients to a new subnet due to requirements coming from the higher ups. I am thinking of doing it like so: 1. Create new scope on DHCP server (Server 2019 ...
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Configuring multiple external subnets

Basically i have 2 routed subnets with distinct gateways and ip ranges from external ips. I am able to configure one just fine routing to the gateway and adding the ip address. However, am i able to ...
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Can I have 2 public subnets one one EC2 instance for creating a load balancer?

So I eventually want to set up a classic load balancer on AWS and I have a VPC with 2 public subnets, but now I am not sure if I can use those two subnets for that one EC2 instance or do I need two ...
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How to set up 20 IP's from 2 different Subnets / 2 Gateways on 1 Interface? - Debian 10

I'm trying to figure out a way to get my networking.service to work properly, so networking service restarts work. How do I setup those 20 IP'S with 2 different Gateways but only 1 NIC? With 2 NIC's I ...
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Why are two IP addresses within the same subnet unable to ping each other?

I was setting up ip addresses between two devices and I noticed something odd. I feel like I am missing an important fundamental here: Context: Device A: 10.30.0.1/12 Device B: 10.2.0.2/12 if I set up ...
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How To Add Docker Container Static Route?

Have a server with 4 subnets - 1 usable IP each and each configured on separate network port on the network card. Running 4 docker containers, but they are randomly accessible upon reboot. How to add ...
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No Access to Cisco ESA from different VLAN

I am in the process to migrate to separate Vlans from a single 10.1.0.0/16 subnet on VLAN1 In the existing /16 subnet is our Cisco Mail Security (ESA). In a new Vlan Segment for clients (10.101.10.0/...
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How to calculate a working "AllowedIPs" for Wireguard on Android?

I am using Android to connect to my WireGuard server through the public IP address of the host network. The LAN is using addresses 192.168.0.1-255. I would like the client to connect through the VPN ...
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Can't ping into subnet

I am currently setting up a network and I'm having some pinging issues between computers, how could I fix this ? Computer A, which is in the main network can ping his own router, and the subnet router,...
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How can I setup NAT with multiple public IPs (/29 subnet) on pfSense?

Our ISP provides a /29 subnet which includes the following IPs: Network Address: 199.1.1.0 Router/Gateway Address: 199.1.1.1 Usable IP addresses: 199.1.1.2 - 199.1.1.6 I would like each of the 5 ...
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Subnet is not creating with terraform on azure, how to fix it?

I am trying to create two centos 8 machines with terraform on azure. My templates github link When I try to apply, I am getting below error related to policy. Could you please suggest how to fix this? ...
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Access VPN subnet from another PC in local(another) subnet [closed]

I have two PC in local subnet (192.168.0.0). One of them have connected through VPN to another subnet(10.0.0.0). [192.168.0.0] | - - PC1 | - - PC2 - - vpn - - [10.0.0.0] Router -- [Internet] Is there ...
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IPv6 vs IPv4 available subnets - enough or too less

I read a bit about IPv6 and found that usually you get assigned a /48 prefix address. Which gives you 16 bit for subnetting. Reading further assuming that you use /64 subnets you would end up with ...
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Unable to add IPV6 Route in GCP

we have a requirement where we need to create a floating Ip and it should be moved across the GCP Compute Instances. In this case we need to add the route under the route table of the VPC(asia-south1) ...
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Error response from daemon: Pool overlaps with other one on this address space (when on VPN)

In Ubuntu I am trying to create a docker network with a specified subnet when on VPN but I get the below error: $ docker network create my-network --subnet 172.17.24.0/18 Error response from daemon: ...
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Selecting subnets for a Service in Fargate

As we can see in the picture above, I can select as many subnets as I want. Does it mean, the tasks in the service are created across these two subnets? Suppose I have one task running, in which ...
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How to link two networks with different IP ranges

I've got a network on ip range 192.168.0.X. It has a router with an internal IP on this range that lets it talk to the outside world. If I create a new network on ip range 192.168.1.X. How can I get ...
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networking default gateway, default route

in ipv4 cidr notation you can have an ip address like 10.10.20.0/24 it's expanded to network : 10.10.20.0 first ip : 10.10.20.1 last ip : 10.10.20.254 broadcast: 10.10.20.255 netmask : 255.255.255....
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Virtually move Host to foreign Network

is there a way to move a host virtually to a different network based on its mac-address? Example: Imagine a firewall with a LAN (let's say 192.168.1.0/24) and a DMZ (e.g. 172.1.1.0/24) interface. ...
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Can't ping PetaLinux machine if both NICs on same subnet and unplug eth0

I have a PetaLinux machine (Embedded Linux on a Xilinx Zynq device, debian fork, kernel 4.19). If the two NICs are on different subnets, then I can disconnect one NIC, and the other will continue ...
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What happens with MASQUERADE and packets that origin on the host itself?

Given the following network: +-- endpoint 1 | internet -- server --+-- endpoint 2 | +-- endpoint 3 where the ...
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How to expose an EC2 to internet on AWS?

I want to expose an EC2 service behind ALB, the flow looks like User -> Route53(Domain) -> ALB -> EC2 Which subnet should the EC2 exist? The private or the public? And in this case, does an ...
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pfSense NAT to server in a second LAN subnet behind an internal second router (not working)

I have a pfSense firewall/router that is exposing some services to my public ip. This is working fine, as long as the service is on the primary LAN subnet (192.168.1.0/24), let's call it LAN-A. E.g. ...
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How to configure Fedora 34 with three NICs and three subnets to route traffic?

I have a Fedora 34 linux and it has a physical ethernet interface (NIC3), a physical wifi interface (NIC2) and an USB/Ethernet interface (NIC1) (USB LTE Dongle). I would like to use the NIC3 to route ...
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Installing Packages in Private ec2 instance without NAT Gateway or NAT instance

I have ec2 Instance in private subnet, and I want to install packages in the private server. How to install packages in private ec2 instance without using NAT?
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Identifying subnet bits of network addresses with same CIDR [closed]

Say we have network addresses 10.10.10.252/30 and 10.10.255.252/30 and 10.255.255.252/30. They all have CIDR of 30. I realize all three subnets have two usable hosts. All three addresses have subnet ...
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VPN tunnel IP is 172.16.4.2, how can I reverse shell to my local machine, from a box on an attached subnet?

This is the ifconfig: utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1340 options=6403<RXCSUM,TXCSUM,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> inet 172.16.4.2 --> 172.16....
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VPN tunnel IP is 172.16.4.2, how can I see what IP's/Subnets are on the other side?

This is the ifconfig: utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1340 options=6403<RXCSUM,TXCSUM,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> inet 172.16.4.2 --> 172.16....
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Binding to random IP from IPv6 subnet (/64) doesn't work

I got a scaleway.com server (DEV1-S) which offers me a /64 IPv6 subnet. I want to use an IP from this subnet to make a HTTP request (will use wget in the examples) but I can't get it to work. The ...
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2 votes
1 answer
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AWS - ssh to instance in private subnet

I have 2 instances in AWS. One of them in a public subnet (bastion), the second one in a private subnet. Both of them were launched with the same key pair (.pem file). This is how I connect to the ...
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How to configure VPC and subnet for EC2 Database accessible privately

I have an EC2 Postgres Database (not standard AWS RDS, but based on my own configured AMI) I have a load balancer, auto scaling group with 4 max servers in each AZ (us-west-2) My load balancer is ...
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Single AD/DHCP/DNS Server - multiple subnets

I'm subnetting the small network of our business for management and security reasons. Prior to this I had: 172.16.1.0/24 And now I want this: 172.16.1.0/24 -> corporate LAN 172.17.0.0/24 -> ...
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Separating networks with limited access between

I am trying to understand networks better and to help me learn I am working on a home project where I want to setup two networks, let's call them Client and Server, on the same geographic location. (...
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Do network acls block inter-subnet traffic as well?

I have VMs placed in different AZs on AWS. In order to be able to do this, you need a subnet in each AZ. If I'm creating a network acl for the entire setup (ie to be associated with all subnets) do I ...
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GRE Tunnel subnet /29

I watched this tutorial: https://www.lowendtalk.com/discussion/156850/howto-tunnel-ddos-protected-ovh-ip-to-vms-in-other-datacenter And I have problems with the GRE tunnel, I created a VPS on server 2 ...
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Issues with Ubuntu Network Setup

Please, someone tell me whats up here, I am going bonkers, I have used multiple calculators etc, everything tells me the details in the image are correct but ubuntu just will not accept.
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1 vote
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How to route from one server to another with Pritunl?

I have a Pritunl installation (free version) with two organizations and two servers. CustomerOrg is attached to CustomerServer that creates the subnet 10.0.1.0/24. StaffOrg is attached to StaffServer ...
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Is there an effect in the subnet size (available IP addresses) when the number of nodes are fixed?

Assume I have 30 computers connected to a network. Is there any disadvantages in using /24 sub net mask over a /27 sub net mask? Do the extra IP addresses (the ones that are not configured on any node)...
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Connect Router on Different Subnet [closed]

I see people genuinely helping out here but please stop with down-votes.I wouldn't have posted on server fault if this wasn't really a business problem.I am going to upgrade this network with a ...
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Multiple Subnets within ESXi host

I'm trying to create some subnets on an ESXi (version 6.7) host and have some VMs within these subnets with one or more that act as gateway between them. I'm trying to do this creating another VLAN on ...
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Connecting industrial devices to OPC server while keeping segregation

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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1 vote
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Fix UDP issues on subnet

I currently have a network with the following topography: topography Networking is fine and all works well, except for one thing: UDP seems to be unstable/not working on the subnets 192.168.3 and 192....
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Network latency & Performance for inter subnet traffic in a AZ

My current local DC deployment has 2 subnets inside a datacenter where data is injected to the instances on a subnet A and then the instance is migrated to subnet B to serve traffic We need to migrate ...
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need help to understand tcpdump

Background: I have a web server hosted on 10.20.30.177:7000 and it should be accessible from 10.20.30.1 (m1) and 172.17.2.88 (m2). I am able to access from m1 and not from m2. I understand there can ...
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