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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Accessing VMWare Management Network from a different subnet

Here's the scenario... We've got a VSphere ESXi 5 box running on a 9.x subnet, our office runs from the 1.x subnet. We can access the VM's running on the box without issue (which also have 9.x IP's) ...
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Figuring out the most efficient use of an ip range

I am working with Packet Tracer atm and have 3 subnet plans : assigned(management(104users) staff(43 users) admin(35 users)). I have an ip address range of:38.191.0.0 and subnet mask of ...
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No internet access when toggling `redirect-gateway` in OpenVPN client config

I have a router with IP 192.168.1.1 subnetting 192.168.1.0/24. On that subnet, a Synology NAS has an IP of 192.168.1.181 and is running a VPN server using subnet 192.168.2.0/24. When I connect a ...
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Cannot RDP into Windows 7 over VPN

The exact scenario where it fails: I am unable to RDP into any Windows 7 or 2008 R2 servers within a certain subnet, while connected to the network via VPN. Windows 7 Client connected through the ...
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1answer
2k views

Adding subnet to a vsphere with single vcenter and esxi host

Let me start of by saying that I do not specialize in networking, I am in the process of adding additional VMs to a testing environment and wanted some recommendations. In this case I am running a ...
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Reverse Proxy multi-subnets

I'm having some problems that I think I should not be ordinarily facing. But after being beating senseless by this, I'm calling out uncle. I have previously posted something along these lines here: ...
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1answer
36 views

Backbones and subnets [closed]

I need some assistance with an assignment I'm doing for college. I think it's pretty easy, but I might be missing something. The task is to create a network based on the given plan (click here to see ...
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2answers
1k views

Unable to access different subnet

Router ip: 192.168.3.1 Windows server: 192.168.3.50 (WLan) and 192.168.2.1 (LAN) PCs: 192.168.2.x I am able to access 192.168.3.50 from laptop (in 3.x network) but unable to access through other ...
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Vagrant: Multiple VMs, static IPs, different subnet than host. - Can't ping/ssh [closed]

I'm currently running a set of Vagrant VMs in the same subnet as the host machine using this setting: config.vm.network "public_network" That's not a solution anymore though because there are not ...
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168 views

AWS Reserved IP addresses [closed]

I have multiple VPC in my account and I created most of VPC using subnet 10.0.0.0/8 or 192.168.0.0/16 or 172.16.0.0/12 subnet blocks. I am exhausted with my range due to not optimizing the IP ...
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1answer
1k views

Anonymous Samba share across subnets (without WINS?)

I'm trying to replace an old Windows 2000 server that is current set up with a number of open anonymous shares used by a legacy application that must remain in production for a few more years. I ...
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2answers
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MAC OS X Server Lion - how to join two subnets?

I've got two routers connected to two different providers. I also have Mac OS X Lion server connected to both of them, so it looks like this: [INTERNET] [INTERNET] | ...
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1answer
1k views

XenServer - VMs to access Internet, but should not be visible from the Internet

I have installed XenServer on my server at the Hetzner datacenter. I have bought an additional /29 subnet containing 6 usable IP addresses from them. I want to install more than 10 VMs on this ...
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1answer
23 views

Will resizing a subnet mask make devices with the former netmask inaccessible?

I have a default VLAN whose subnet mask is a /28. I now intend to use the default VLAN for imaging, so clients need to be able to receive DHCP leases from this VLAN. In order to have enough ...
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19 views

Can't access drobo Pro via iscsi on new subnet

We have a Drobo Pro on our subnet which works fine via iscsi, however I am in the process of moving the servers over to a new subnet. I can access the Drobo with DroboDashboard via USB on my Mac and ...
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3answers
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Connecting to a remote server through a VPN when the local network subnet address conflicts with a remote network

This is a Canonical Question about solving IPv4 subnet conflicts between a VPN client's local network and one across the VPN link from it. After connecting to a remote location via OpenVPN, ...
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1answer
55 views

Router configuration, subnetting, DMZ

I'd like to use a subnet of our public IP addresses in the DMZ like shown in this picture: Does my provider have to add a routing entry on the first router for the DMZ-net? Can I assign the whole ...
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1answer
112 views

Separate subnet with exceptions [closed]

I have a network with clients in the 192.168.30.x range and clients in the 192.168.40.x range. both are in a 255.255.0.0 subnet. All clients with .30.x are connected to one switch and all clients with ...
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multiple physical interfaces with IPs on the same subnet

I have a linux box with 9 NICs on it, and I want eight of them to have unique addresses on the same subnet, e.g.: ifconfig eth1 192.168.123.1 netmask 255.255.0.0 ifconfig eth2 192.168.123.2 netmask ...
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1answer
54 views

Unable to Ping a server IP which is outside the subnet mask

This is the setup we are having: 2 servers which are in HA[High Availability Network] are configured with the following IP address Server 1 --> 10.54.48.x and Server 2 --> 10.54.49.x. There is a ...
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Ping problems with two interfaces, same subnet, direct connections to two separate hosts

I have a configuration of a client machine (Ubuntu 14.04.2 LTS) that directly connects to two server machines. The server machines--while on the same subnet--cannot route to each other. Packets must ...
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3answers
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VPN Tunnel, subnets conflict

I'm trying to create IPsec VPN Tunnel between two sites. Site 1 Fortigate 140D Local subnet : 192.168.1.0/24 Site 2 Fortigate 100D Local Subnet : 192.168.2.0/24 But when I try to create it, it ...
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1answer
41 views

Subnetting/Supernetting Configuration

I have an existing network. It looks like this. Router LAN (192.168.0.1 /24) -> Switch (192.168.0.10 /24) -> Workstations (192.168.0.100 - 192.168.0.200 /24) Our network has expanded and I need to ...
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2answers
55 views

Multiple NIC same subnet [closed]

I have a setup as shown in the image. I know it is insane but i have to work on this configuration only. It is basically an ubuntu server acting as a router with 4 interfaces. 3 of them (eth0, eth1 ...
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1answer
58 views

KeepAlived on different subnets

I am trying to setup keepalived on ESXi based setup where 2 physical box have ESXi installed and each one having a node which works as load-balancer using HAProxy. Now in order to achieve high ...
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1answer
115 views

DHCP Server with multiple network interfaces and different subnets

I am trying to set up a dhcp server (isc dhcpd on debian 8 (vm inside an esxi environment)) with 4 network interfaces, eth0-3. The dhcp server should serve a different subnet on the interfaces eth1, ...
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1answer
29 views

AWS: Public vs. Private Subnets for multi-tiered web applications [closed]

Is there a recommended "best practice" for deploying multi-tiered web applications into AWS as it relates to public and private subnets? Most of the documentation, including AWS' suggest public for ...
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1answer
24 views

VLSM Subnetting: Smallest subnet first

I'm setting up a new network. When I search on the internet and make use of subnet calculators. My largest range is always placed first. Now I rather start with my firewalls, then place me ...
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1answer
23 views

disallow Samba WINS from making hostnames viewable across subnets

I have a samba server set up at work for simple things, such as printer and folder sharing. There is a "internal" subnet and VLAN and a "guest" subnet and VLAN. Samba runs on the same Debian machine ...
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1answer
28 views

How to open entire subnet with iptables [closed]

I want to enable the entire subnet 192.168.1.0/24 which is connected to eth0 in input. I'm very unfamiliar with iptables. If I add the rule: # iptables -A INPUT -s 192.168.1.0/24 -p tcp -m tcp ...
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1answer
81 views

Multiple internet connections with internal subnet

We have 4 x business broadband connections and 1 static IP address. We have several servers which need to access one another and the internet and some need to be accessible remotely from the ...
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2answers
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IPv6 subnetting a /64 - what will break, and how to work around it?

In IPv6, you are not supposed to subnet to anything smaller than a /64 (RFC 5375). Among other things, SLAAC does not work with smaller subnets, and apparently also some other features will break. ...
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1answer
33 views

Is it possible to split an active subnet in aws?

I created a VPC thinking I wouldn't need subnets. I just gave the vpc a CIDR range like 192.168.0.1/24 I then created a subnet which matches that exactly. Low and behold RDS requires it's own subnet. ...
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3answers
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NFS mount with file locking not possible any more after move to new subnet: statd timed out, lockd cannot monitor

I'm operating an Ubuntu 10.04 NFS Server with LDAP user authentication on a virtual machine in Subnet A. The server exports the users home directories with nfs v3 to ubuntu clients in subnets B and C. ...
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1answer
48 views

LAN access but no internet connection unless different subnet [closed]

Dear SF@StackExchange, I'm using an access point that provides LAN as well as WLAN capabilities using 4G to connect its hosts to the internet. DHCP is deactivated by design. Regardless of the OS ...
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1answer
23 views

Two subnets on one LAN

I have a simple 192.168.1.x/24 LAN GW & DNS = 192.168.1.254 My workstation is 192.168.1.101 I wish to setup a parallel mirror LAN for testing using a 192.168.10.x/24 subnet on the same switch. ...
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1answer
56 views

Set default route to virtual ip

I have a Virtual private cloud running on 10.0.0.x. In this network two machines share a virtual ip to provide HA and connection to the internet via aaa.bbb.ccc.164. There configs are: Proxy1: ...
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1answer
15 views

Should I break into subnets [duplicate]

I am a working on designing a network for a new volunteer ambulance headquarters. I am trying to decide if I should use Sub nets and how to group them. As of now the network load is going to be made ...
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2answers
41 views

AWS: Serve up website from private subnet?

I'm unable to get from the internet to a web page hosted on my server in a private subnet. Using this: How can I place a Webserver in a private subnet in AWS and open it to the world on port 80 as a ...
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0answers
36 views

NGINX load balance via client subnet

I have 3 frontends with web application in different subnets. I want to use nginx as load balancer, but I want balance clients via client subnet. For example: frontend1 - 1.1.1.10 frontend2 - ...
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2answers
79 views

Why are subnet masks specified in full dot notation, rather than just a number?

Subnet masks for IPv4 (dunno about v6) are specified in full dot notation, e.g. 255.255.255.0. This means that the lower eight bits can be used to assign IP addresses to devices on a LAN (if I ...
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0answers
32 views

Understanding AWS ELB, multiple ELB per subnet or one ELB per subnet?

So I'm trying to setup a production site and I'm new to the devops world. I have a setup that consists of four components: 1) Node.js API Server 2) Memcached Elasticache cluster 3) Postgresql RDS 4) ...
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Subnet Ranges and Layer 2 Networking [duplicate]

If I have two hosts sitting on the same layer 2 switch and host-A address = 192.168.1.1/16 and host-B address = 192.168.1.2/24, should these two hosts still be able to communicate?
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Create smaller subnets from large subnet

My network is 10.10.0.0/16. I would like to break this up into /24s. My environment: I use /etc/hosts with dnsmasq for DNS and isc-dhcp-server for DHCP on an Ubuntu 14.04 server (gateway, router) ...
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31 views

Static route to access another IP/SUBNET from PC

Maybe it's a simple concept misunderstand. I'm in a network with ip 172.16.0.xxx (mask 255.255.240.0). How could I configure my PC (Windows 7) with a static route or any other kind of solution so I ...
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1answer
39 views

Troubleshooting access to S3 endpoint from VPC subnet

I have a server with the following route table on its subnet: 10.xxx.xxx.xxx/24 -- local pl-xxxxxxxxxx(com.amazonaws.us-east-1.s3) -- vpce-xxxxxxx 10.0.0.0/8 -- vgw-xxxxxxxx 192.1.0.0/12 -- ...
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2answers
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How to join 2 different subnets in one domain

I have a Windows 2008 Domain Controller with ip 10.0.2.x. I also have another group (workgroup) of PC's in a remote site with ip 10.0.1.x. The two sites are connected via VPN with ZyXEL routers. I ...
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2answers
686 views

Utilizing A Secondary IP On A NIC In A Windows Cluster

RELEVANT INFORMATION I have a windows cluster with 3 nodes in it... Node1 Node2 Node3 I have 4 NICs on each node... NIC1_Host NIC2_Virtuals NIC3_Cluster_HB NIC4_Live_Migration This is the ...
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1answer
53 views

how to reach a host on a different subnet

I am new to networking and I am trying to work through a problem however I have become a bit stuck. I have a network with a subnet mask of 255.255.255.128, I have connected the routers for each of ...
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157 views

What is the best IP subnet to avoid subnet collisions?

My company installs specialized webservers for tracking commercial building HVAC performance. These machines each have two LAN adapters--a primary and a secondary. The way the system is intended to ...