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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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Subnet CIDR Scheme

I am redoing some VPC work that my predecessor did. I haven't setup a lot of networks, so I wanted to double check what I think makes sense isn't breaking some rule that I'm not familiar with. What ...
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2answers
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Configuring subnet between machines with bonded network cards

Two machines have bond0 configured to access the Internet. Technicians in datacenter say the VLAN is created, I just need to configure interfaces on servers to work with it correctly (create a subnet)....
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Simple router with two ethernet interface no static route needed?

Normaly, for two subnets connected with one router, i always used to create two routes per example: subnet 1: 192.168.1.0/24 subnet 2: 192.168.2.0/24 router interface 1: 192.168.1.99 router ...
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Assigning a subnet to a sqladmin instance with jinja

I have deployed a Google Cloud sqladmin instance (sqladmin.v1beta4.instance) and database (sqladmin.v1beta4.database), but I now want to assign it to my private subnet. I have done this successfully ...
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1answer
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Ubuntu subnet distribution

I´ve a question regarding the distribution of subnets within my linux system or more specifically ubuntu. If I set a ip-adresse with a netmask, how will ubuntu set the netaddress and broadaddress of ...
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1answer
29 views

EXSI 6.7 Multiple Subnets

I'm new to VM's as I've always setup physical servers in the past. I have installed VMWARE EXSI 6.7 on my HP server and I've setup 2 VM's. One is for a SCADA system and the other is for a ...
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44 views

IPv6 subnets ping ok but no TCP?

I have a short questions. I have 2 IPv6 nodes connected over Layer 2 unmanaged Switch. Node 1's static address: fd53:7cb8:383:101::121/48 Node 2's static address: fd53:7cb8:383:1ff::141/48 ...
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1answer
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What IPv6 block should be whitelisted when a user asks to whitelist their IP?

Currently, on my IPv4-only service, users can whitelist their IP address which allows them to bypass email 2-factor authentication when they log in. When they do this we only whitelist that single IP ...
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1answer
48 views

Two hosts within different network connected to a switch should communicate?

I'm trying to understand how this works.. I have 2 hosts with these IP addresses: m1: 192.168.0.1/24 m2: 192.168.1.1/24 As you can see, they are on different network.. And in my case, they are ...
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2answers
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Why does my Windows DHCP server hand out a non-configured subnet mask?

We run the DHCP server role on our domain controller (Windows SBS 2011). We want our LAN subnet to be restricted 10.1.1.0/24 (unsure if this is the correct notation but our subnet to be restricted ...
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2answers
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VPN into router behind a Sonicwall

We've installed a Sonicwall TZ Firewall and have configured an L2TP/Ipsec VPN. The SonicWall is connected to an internal router on the subnet 192.168.168.0/30 with the SonicWall on 192.168.168.1 and ...
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1answer
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Network connection slow, one-way, between Ubuntu and Mac OS

I'm stumped. I have three nodes -- 2 iMacs and 1 Ubuntu 18.04 server -- all on the same subnet. When I send files, e.g. scp, from Ubuntu to Mac it's relatively fast (5mb/s - not lightning but ...
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2answers
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DHCP in packet-tracer is not assigning IP correctly, what am I missing?

I have the network 172.28.226.128/24 Whereas first Host should be "172.28.226.129" and last Host "172.28.227.127" now, when I try to use dhcp in packet tracer, it assigns the ip "172.28.226.1" to ...
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1answer
89 views

OpenVPN: Addressing remote LANs

I've been trying to solve this problem for a while now, but to no avail. We basically have an OpenVPN server to which our end devices need to connect. Some of those devices can directly connect to the ...
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How to configure IPv6 subnet on CentOS 7

I have a VPS with 2 IPV6 addresses, 240e:200:xxx1:12::159 and 240e:200:xxx1:12::160,gw 240e:200:xxx1:12::1. Recently I asked for IPv6 support from the administrator, here is what I got respond 240e:...
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1answer
51 views

Network setting for similar looking subnets

I have a CentOS 7 PC (with 2 NIC cards) and 2 servers. I'd like to access these servers from the 2 NICs in a different way. Something like one server can be reached only from NIC1, and the other ...
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1answer
108 views

Accessing two isolated subnets from a Linux box

I have a Linux box with two NICs, each connected to a different LAN: LAN A: 192.168.1.0 255.255.255.0 LAN B: 192.168.2.0 255.255.255.0 The routers are: RouterA: 192.168.1.1 RouterB: 192.168.2.1 ...
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1answer
68 views

Proxy setup between a private and public

I have two servers: Private Server with IP: 172.16.0.2 Public Server with 172.16.0.3 (private IP) and x.x.x.x (public IP) What I want to achieve is: Incoming communications to Public IP (x.x.x.x) ...
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0answers
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Networking bits to number of subnets [duplicate]

How does one use the value of networking bits of a class A address to find the number of subnet bits and host bits? For example, with a subnet mask of /22, what would be the process of finding the ...
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1answer
213 views

What is a good subnet strategy for AWS VPC? [closed]

I currently have each VPC per cluster (stg, prd, tst, misc) and the standard clusters (stg, prd) have these subnets: elb: for public elb(s) that will received direct public traffic elb-int: for ...
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1answer
73 views

NAT gateway for ec2 instances

I have a public subnet with ec2 instnaces. The route table has 0.0.0.0/0 IGW (Internet Gateway) as default. I tested adding a public IP address to my instance (104.27.142.41/32 as reported by curl ...
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0answers
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Server with two NICs behind Ubiquiti ERX, connected to two separate private company networks with possible similar address spaces

We have a Ubuntu 18.04 Server running a web application that needs to be accessed by two companies. We have two NICs on the server, one goes to our local "shop floor" network (10.200.145.0/24) which ...
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0answers
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Request timeout issue while pinging remote computer with site to site VPN Connection

I am having site to site vpn configured with sonic wall. Central site is having two subnets 192.168.1.x and 192.168.10.x. Problem is I can ping 192.168.1.x network, but cannot 192.168.10.x from remote ...
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3answers
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What significance does the subnet mask have for a public IP address? [closed]

Our hoster has assigned us multiple public IP addresses. They are individual non-contiguous addresses e.g. 1.1.1.50 and 1.1.1.222. According to them the correct subnet mask to use is 255.255.255.0. I ...
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1answer
47 views

Export my whole AWS architecture into file?

In AWS, I have a VPC with many components inside, including subnets, security groups, gateways, load balancers, target groups, many instances, and others. Is there any ways to export my whole ...
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1answer
74 views

Why does 172.16.0.0/12 equal to range 172.16.0.0 — 172.31.255.255? [duplicate]

So we have a private network: 172.16.0.0/12 that means: 10101100.00010000.00000000.00000000 (value: 172.16.0.0) 11111111.11110000.00000000.00000000 (subnet mask of /12) How does that translate to ...
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2answers
37 views

Unable to delete a subnet I created in GCP

I have a subnet in GCP, under the default network, called xxx-general If I try to delete this subnet (as it's no longer required), I get an error: Failed to delete the subnet. Error: The subnetwork ...
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Distribute a network in subnetworks [duplicate]

I am new to subnetting and still in learning phase, so I want to create 6 subnetworks from the following IP range 192.168.10.0/24 I have created the following subnetworks (since i need 6 so i ...
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1answer
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The routing behavior of VMs in Azure is strange

I have three Ubuntu machines, machine A, B, C. I also created a VNet 10.3.0.0/16, and create three sub-net SubN1: 10.3.0.0/24 SubN2: 10.3.1.0/24 SubN3: 10.3.2.0/24 Machine A has 3 nics, eth0, eth1, ...
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1answer
103 views

Google Cloud - Unable to connect to internet from my private instance using Nat instance in VPC

My configuration 1. Created a VPC (poller-vpc) 2. Created two subnets (private subnet[0.0.1.0/27] , public subnet[0.0.1.32/27]) 3. Added firewall rule (tcp, udp, icmp for 0.0.0.0/0 for vpc-poller ...
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Failure to ping two devices on the same subnet

Need some help with Routing. I do not understand how to make this work I have 2 Devices configured. One of the devices(somebox1) is configured with 2 interfaces and the Routing table looks similar as ...
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Routing between OpenVPN subnets in tunnel modes

Hope someone can help me and understand what is wrong in my setup. I have installed OpenWrt Chaos Calmer 15.05 on m TP Link router. The router have the WAN connected and a WiFi and wired subnet on ...
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2answers
130 views

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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1answer
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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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2answers
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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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1answer
35 views

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
128 views

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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1answer
87 views

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
109 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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0answers
49 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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1answer
97 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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1answer
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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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1answer
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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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0answers
549 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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0answers
187 views

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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1answer
122 views

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
63 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
157 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 ...