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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OpenVPN Access Server: Remote Subnet Cannot Access Client's Resources

I have OpenVPN Access Server running. Here's the configuration: 172.18.16.0/20 Client (172.18.16.101) ----- OpenVPN Server (172.16.0.0/20) | ...
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0answers
22 views

Why is my AWS instance's private IP outside of the subnet's range?

I'm trying to launch an instance with the private IP address 172.31.32.101 using Terraform in my default VPC (CIDR 172.31.0.0/16), in the eu-west-1a subnet that has the CIDR 172.31.32.0/20. I can ...
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2answers
42 views

Ping PC in Different Subnet / Network [closed]

I am new to practical aspects of networking. So what I was trying is to ping two PC which are connected to two (wireless) routers which are taking internet through LAN. So Router 1 IP : 10.100.98.25 ...
0
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0answers
24 views

Shrew soft vpn routing

I have successfully setup a Shrew VPN from Windows to a CISCO ASA router. (I dont have control of the CISCO ASA router. The tunnel comes up and works provided I only have one Remote Network Resource ...
11
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2answers
479 views

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. ...
0
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1answer
24 views

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 ...
2
votes
2answers
110 views

Potential traffic issues on one big(ger) subnet

Posts like this: Most traffic in a corporate LAN is client to server nowadays, and a router not very well setup rather becomes a bottleneck AND a SPOF. and 200+ clients on a subnet wasn't a ...
0
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1answer
26 views

Two-way routing for router and openvpn server subnets

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 ...
1
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1answer
1k 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 ...
2
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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] | ...
0
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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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2answers
101 views

IP on different subnet mask [closed]

I'm still learning the ropes of Windows Server (specifically 2012R2). My assigned task is to setup a static local IP address, I managed to get it set to 192.168.1.96 (with subnet mask 255.255.255.0) ...
0
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1answer
86 views

Is there any harm to use the broadcast IP for a host?

I'm managing a /27 network. Obviously I cannot assign the network address to any host, but I found assigning the broadcast IP to a host seems to be OK. The host with the broadcast IP of the network as ...
0
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1answer
66 views

What does 192.168.1.1 /4 mean? [duplicate]

What does 192.168.1.1 /4 mean? Is there a calculator that translates this kind of notation to a list of IP addresses? For that matter any type of notation so that it would be easy and quick in the ...
1
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1answer
66 views

Locating an AWS S3 physically in a private subnet (like RDS)

Similar to how an RDS instance requires you to pick the specific subnets (which can be in a VPC's private subnet), can AWS S3 stores also be physically located in a VPC's private subnet?
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4answers
28k views

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 ...
0
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2answers
52 views

Two of the same subnets on the same network. Possible?

I have a question for everyone that I am a little confused about. If you have a network. 192.168.1.254. I know you can put in a router as a gateway and get another network with 192.168.10.254. My ...
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3answers
12k views

subneting .. is 192.168.0.1/24 different than 192.168.0.1/25? [duplicate]

I am trying to understand subnetting. I understand that you can take the 192.168.0.0/24 domain and break it into 2 subnets: 192.168.0.0/25 and 192.168.0.128/25. What if I need to create 2 more subnets ...
0
votes
3answers
788 views

XenServer 6.2 - Hetzner host - Additional Subnet Configuration

I have a dedicated server on Hetzner, on which I have installed XenServer 6.2 . The server comes with one public IP address. I purchased an additional subnet containing 6 usable IP addresses, for use ...
2
votes
3answers
740 views

/32 subnets on Ethernet via DHCP

Is it possible to assign to an ethernet host via DHCP a subnet mask of only the host itself, e.g. 192.168.1.123/32? Do common operating systems support this kind of configuration? I'd like for the ...
0
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1answer
32 views

Increasing Network IP range/scope

We have windows 2012 AD environment with IIS & MS SQL running on it. Our current IP range is from 192.168.100.* with subnet mask 255.255.255.0. We are getting very close to .254 IP (Only 10-15 ...
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0answers
22 views

Routing and VPN Setup

The network setup is as follows: Router: eth0 1.1.1.1 (outside) eth1 192.168.54.4 (inside) eth1 10.54.4.4 (inside) Cisco ASA5505 192.168.54.1 (inside) 10.54.4.1 ...
3
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0answers
135 views

Pacemaker ocf:heartbeat:IPaddr on different subnets

I'm trying to add a Pacemaker virtual IP address; with it, the gateway, and the two VMs it serves on different subnets. I've only done this before with all IPs on the same subnet, and I need some ...
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1answer
43 views

Dividing IP range among subnets [closed]

A company has been allocated all the IP addresses in the range 134.7.1.XXX, and needs to create three (3) subnets. The first subnet needs to be twice the size of the other 2 Is the answer simply: ...
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1answer
32 views

Azure Virtual Network Custom DNS

I created a virtual network and put 2 VMs in one subnet. But they were not able to ping each other using their hostnames. I need a DNS Server implemented so that hostnames in the subnet can be ...
1
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1answer
58 views

Are two IPs with different subnet masks but same netword IDs on the same network? [duplicate]

I can't figure this out. I have two IPs, and two subnet masks: IP1: 10.150.1.4 SM: 255.255.255.248 IP2: 10.150.1.6 SM: 255.255.255.224 These two hosts both have the same Network ID (10.150.1.0) ...
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votes
1answer
41 views

Subnetting - Am I doing this right? [duplicate]

I'm planning my first network with 2 subnets and came up with the following schema: http://i.stack.imgur.com/bBZay.png I'd like to know... Would this work? Did I use the right amount of routers? ...
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4answers
2k views

Wake on LAN over different subnets

I have 3 IP blocks and 3 Cisco Switches. Each switch has its own IP block - 10.45.100.0/24, 10.45.101.0/24 and 10.45.102.0/24 I have got a PC on 10.45.100.0/24 block. I can wake up whole computers ...
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3answers
5k views

Running two subnets over the same physical LAN

One of our remote offices has given a security contract to a company that came in and set up IP security cameras and a server in our office. They clearly didn't know anything about integration of ...
0
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1answer
104 views

Subnetting and VLANs for Multiple Buildings Strategy

Curious for a little feedback on how others do this. A site I'm looking at has multiple buildings connected by fiber and each is on their own subnet. 192.168.0.0 - Building 1 - VLAN10 192.168.1.0 - ...
4
votes
2answers
6k views

Routing between two routers with static routes

I have a Draytek 3200 router and a pfsense rackmount router that I am trying to get to route to each other. I have a subnet on each router and a subnet for the link between, as shown here: As it ...
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0answers
23 views

Routing is disabled for LAN users while choosing all-net for IPSec tunnel

I have VPN with L2TP/IPSec server and tunnel configured. When I choose all-nets 0.0.0.0/0 to allow connection from any computer in the world, all LAN users with subnet 10.0.0.0/8 are disconnected from ...
0
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2answers
124 views

Combining two subnets with same default gateway

This is the current situation: Subnet 1: 192.168.1.x (255.255.255.0) with default gateway on 192.168.1.1 Subnet 2: 192.168.90.x (255.255.255.0) without any gateway (no internet access) -> all ...
1
vote
1answer
269 views

RRAS 2012R2 NAT with isolated subnets

I'm trying to find a solution for this problem for many weeks I hope someone can help me. I have a rather simple network: Windows Server 2012R2 with multiple NICs A few subnets (VLANs) with DHCP's ...
3
votes
3answers
1k views

How to access devices with static IPs on different subnet than router?

I have a SonicWall TZ100, firmware SonicOS Enhanced 5.8.1.13, with a static subnet of 10.0.6.0/24 on X0. Ports X2-X4 are port shielded to X0. On ports X3 and X4 I have two devices that were moved from ...
0
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2answers
50 views

Is a “bridging device” required to join two networks?

We're considering two NBN fibre connections to the Internet (NBN is a fibre connection for those of you not living in Australia), with each connection having it's own subnet. The first connection's ...
0
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2answers
200 views

Interesting network design with advanced sub-netting issues

Two clients share a town house together; Each has "X" number of floors. One has the top few the other the bottom. The issue is there are a number of IP security cameras, some private to each network ...
0
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0answers
45 views

Can foreman handle nested subnets?

In Foreman 1.8 one can manage subnets through the web-interface at Infrastructure > Subnets. However, when I add a /24 (e.g. 10.10.0.0 with a subnetmask of 255.255.255.0), I cannot add anything less ...
0
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1answer
143 views

Make Asterisk to serve another subnet

I have server with Linux Ubuntu 12.04. It has two subnets - 192.168.0.1(eth0) and 192.168.1.1 (eth1). There is an Asterisk server (IP PBX) connected to first subnet, lets say it has IP address ...
2
votes
4answers
6k views

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 ...
0
votes
2answers
344 views

First and last IP address of the network 192.168.176.0/23 (subnet 23) [duplicate]

Let's have the following address of the network: 192.168.176.0/23. What are the first and last IP addresses of this network? Following this answer http://serverfault.com/a/327782/288201 I assume ...
18
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12answers
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Is it better to use the 192.168.x.x or 10.x.x.x address range for a small business network?

For best performance and ease of management, is it better to use 192.168.x.x or 10.x.x.x range of addresses for a small (<50 PCs) business network? This would correspond to a subnet of 255.255.0.0 ...
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vote
2answers
70 views

Iptables doesn't forward ssh access to instance under a public subnet

I have the following scenario: 1 - A bastion (NAT) instance which I use as a gateway to forward ssh access to all my private instances (using iptables) [Private IP: 10.10.1.10 Public IP: ...
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0answers
32 views

Security implications of wide WAN subnet

I have a server at OVH and say my public IP adress is xx.xx.xx.81 and the gateway is at xx.xx.xx.254. To reach the gateway, I need pfSense to be configured static WAN IP with xx.xx.xx.81/24, i.e. the ...
0
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2answers
439 views

pfSense: How to add a second WAN subnet for dummies

Can anyone point me to info on what to change on a pfSense device for a 2nd subnet on a single interface? My colo provider has allocated a /29 subnet to me of which I can use 3 IP addresses (for some ...
0
votes
1answer
34 views

Linux kernel behavior when dealing with colliding subnets

I'm using openconnect to connect to my office VPN. They push some pretty crappy/aggressive routing rules allocating ALL of the private IP address spaces >.< After I connect to my office VPN, my ...
0
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1answer
190 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 ...
0
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1answer
290 views

AH00526 - apache 2.4 require ip range

I'm using FreeBSD 9.2-RELEASE-p5 w/ apache24-2.4.12 package: [root@j ~]# uname -a FreeBSD X 9.2-RELEASE-p5 FreeBSD 9.2-RELEASE-p5 #0 r265974: Wed May 14 07:57:04 PDT 2014 ...
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2answers
99 views

setting up default-gateway on a router

So I've got this weird assignment, where each branch office has to be able to access the main office (and Internet) through a serial connection. Since switches don't have a serial connections ...
17
votes
3answers
1k views

Is it possible to SSH access a server with a misconfigured subnet?

We have a server where one of our engineers misconfigured the subnet and now we are locked out of this server and the only access that I know of would work is a serial console from IDC (it means ...