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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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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36 views

Backbones and subnets [on hold]

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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18 views

Vagrant: Multiple VMs, static IPs, different subnet than host. - Can't ping/ssh [on hold]

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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151 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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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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28 views

DNS on subnet B returns IP of router NIC on subnet B to clients on subnet A

The setup: Local office space is called subnet A, this subnet is assigned the IP range between 10.0.0.40 and 10.0.0.254 with lower numbers reserved for static assignments. Subnet A contains a Windows ...
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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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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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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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38 views

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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165 views

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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39 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
53 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
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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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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56 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
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
79 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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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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1answer
113 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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46 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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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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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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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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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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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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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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8 views

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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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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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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61 views

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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1answer
52 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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156 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 ...
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45 views

IP Subnetting vs VLAN for VoIP Traffic

I have a fairly small network with scanners, printers, phones and workstations/servers all sharing the same subnet (10.0.0.0). I am having issues with our VoIP phones and sluggish response on the ...
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47 views

Multiple Subnet, Same Gateway

I have a nexus3000 switch that has a L3 connection with an uplink switch. (172.18.186.129-130/30) ... In downlink, I have multiple servers and VLANs and I have a range of IP-addresses ...
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64 views

classes declaration inside of subnets in isc dhcp

I would like to use class declarations based on a subnet scope, is that allowed? Or are all classes global scope? here is my dhcp.conf snippet: subnet 10.200.147.0 netmask 255.255.255.224 { ...
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24 views

IP range connected to my server suddenly times out

I've been leasing several /24 subnets from an external source and then I had my hosting company route them to my server. I've added the IPs using a network-script file ifcfg-eth0-range1 with contents ...
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1answer
73 views

I FUBAR'd the IP, subnet, and VLAN settings. Now how to access managed switch?

I have a Dell powerconnect 2748. I think I have done messed it up though when setting it up because so far I have not been able to access the webconfig of the switch after I changed some settings I ...
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1answer
41 views

Access network shares on diferent subnet

I have two computers on my domain on different subnets, one in 10.100.176.x and other on 10.100.54.x. On the first one I can see the in explorer other network shares from 10.100.170.x to 10.100.178.x ...
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What is a subnet? [closed]

My company has our printers provided by a contractor via a managed service. The contractor has software installed in our network which is supposed to detect the printers and then report back on the ...
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85 views

SSH'ing from a different subnet. The router does not seem to route correctly

An EDIT was made at the bottom I have a macbook on 192.168.12.x subnet, and a debian machine with apache2 server with ssh enabled sitting on 192.168.1.x subnet. The debian machine has a static IP ...
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35 views

Is subnetting still needed with switches instead of hubs?

I've been reading about subnetting on a few stack exchange sites and others that I found online but the majority of posts seem to contain outdated responses such as class networks etc. So to my ...
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23 views

Selective Apache v2.2 Authentication

I would like to modify this snippet so that connections from a certain IP subnet will be accepted without a requirement for authentication. Is this possible? TIA Shaun <Location "/rssbus"> ...
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26 views

How to subnet in virtual SMB networks

I'm setting up a Server 2012 R2 with Hyper-V role in a typically SMB environment (virtualized DC and Exchange on one single Host). Before, in the SBS times, there usually was one physical server, a ...
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2answers
58 views

How to secure network against connecting bad device with DHCP?

I have a network with 500+ computers, at my area there is lots of cooperation companies that sometimes bring their own routers. If they do it in sneaky way and do not turn off DHCP service on the ...
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1answer
361 views

3 routers with three subnets to connect with each other without conflicts [closed]

I have a network environment with three routers: router #1 uses 192.168.1.x (TP-LINK TL-WR340G using it as switch) router #2 uses 192.168.3.x (SonicWALL TZ200 using it as DHCP and VPN) router #3 ...
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41 views

Internet from AWS Private Subnet Instance Not Working

I created on AWS a VPC with a private and a public subnet. I launched an instance from the private subnet and I would like to access the internet through the NAT server. Disabled the ...