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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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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redsocks and iptables in LAN

Is it possible for redsocks to capture traffic within the LAN/Same subnet/private network. I need to proxy ALL the outgoing tcp traffic from a Linux device. The device, proxy server and target server ...
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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
20 views

How to access a pc on local network from main network [closed]

We are in college and every room of two people has only one lan port. We belong to a college subnet: 172.31.80.218/26 Now I am connected to our lan port and have the above IP. I create a wifi hotspot ...
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25 views

Configuring a different Subnet Mask rather than the one Configured in the Network Router [closed]

Let us say, I have a host configured as 192.168.x.x/24. This is connected to a Router whose Subnet mask is /23 or 255.255.254.0 What difference Would it make if I have configured the host as /24 ...
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33 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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0answers
4 views

Use ubuntu 14.04.3 box as a wireless access point, no dhcp server and eth0 to wlan0 bridging [migrated]

I noticed that I had a 300Mbps N wireless adapter laying arround so I decided to use it in my ubuntu server to expand the range of my local nework, that server is being used as a samba and ftp server, ...
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25 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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1answer
25 views

How to connect to sub-net device from internet? is it possible? [closed]

EXAMPLE i mean like when you have web-host on your (sub-net cellular internet android device) and try to reach it from your (ip static broad-bond internet laptop) Problem as we all know the ...
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2answers
70 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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2k views

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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1k views

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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21 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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1answer
1k 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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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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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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46 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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23 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
23 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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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
1k views

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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2answers
12k views

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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500 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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41 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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142 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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2answers
21k views

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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3answers
19k views

Sonicwall routing between multiple subnets on multiple interfaces

As shown by the network diagram below, I have two completely separate networks. One is being managed by a Sonicwall NSA 220, the other by some other router (the brand is not important). My goal is to ...
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35 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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1answer
26 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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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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Best way to segment traffic, VLAN or subnet?

We have a medium-sized network of around 200 nodes and are currently in the process of replacing old daisy-chained switches with stack-able or chassis style switches. Right now, our network is broken ...
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23 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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7 views

Subnetting Guidance [duplicate]

I am following a subnetting tutorial and seem to be having difficulties. How many subnets and hosts per subnet can you get from the network 172.168.21.0 255.255.255.224? First look to the network ...
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33 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
34 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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43 views

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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3answers
7k views

Why can't I have the same subnet on WAN and LAN? [closed]

I want to know why same IP with same mask on both WAN and LAN side could be a problem. I also want to know if setting different mask, but having same IPs will resolve the routing problem. ...
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2answers
66 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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2answers
33 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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22 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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1answer
22 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
54 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
165 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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33 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 ...
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2answers
117 views

can two nic have same subnet but different network? [closed]

Business case: A computer has eth0 and eth1 and eth0 address is 192.168.1.2 (static). The eth0 is used by a configuration software to configure the address of eth1 in the field. eth0 is only for ...
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4answers
9k views

Routing between two subnets using a Linux box with two NICs

I have a Linux box with two NICs, each connected to a different LAN: Network A: 192.168.1.0 255.255.255.0 Network B: 192.168.2.0 255.255.255.0 The routers are: 192.168.1.1 192.168.2.1 Linux ...
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2answers
81 views

How to isolate networks when subnetting? [duplicate]

I'm currently learning about IPv4 and subnetting. As far as I understand, if we want to create 4 small isolated networks with the size 50, we can use subnetting. If we subnet a Class-C IPv4 ...
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2answers
53 views

In subnetting, is a router interface considered a 'host'?

When calculating the subnets in VLSM, you generally need to specify the number of hosts in a subnet. Should I consider a router's interface a host as well? Correct me if I'm wrong, but I believe the ...
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1answer
37 views

Run Filezilla on private subnet at AWS

I have a VPC with one public subnet and one private. The public subnet has an OpenVpn Server and a public IP The private subnet has a Win 2012R2 Server with an Oracle 11g server. My set up: 1. VPC: ...
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59 views

Accessing a server with wrong IP out of segment range

I have run into a similar problem as in this question about a wrong IP in LAN. However, the standard addr alias trick on the NIC did not help. I have no direct access to the server console, I might ...