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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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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51 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 (172.18.186.0/...
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91 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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26 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
75 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
49 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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2answers
51 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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2answers
95 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
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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1answer
27 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
62 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
408 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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46 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 source/...
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2answers
340 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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2answers
141 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 network(...
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2answers
96 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
50 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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1answer
43 views

How to supernet a group of subnets together? [duplicate]

For example, I have these hosts from different subnets: 192.168.0.1/27 192.168.0.33/27 192.168.0.65/27 192.168.0.97/27 How can I supernet them together and find the network address and mask? (...
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1answer
68 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 ...
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1answer
226 views

Allow communication between two networks

+--------------------------+ +--------------------------+ | Office A | | Office B | | Technicolor TG784n v3 | | ...
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1answer
43 views

Routing inernal network

I know this is not the ideal or close to ideal network setup, but I have just setup a SBS 2008 server on a KVM/VPS and have encountered a networking issue. I know that the i will lose server feature ...
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24 views

Why do I have to specify the subnet broadcast address?

When configuring the management IP address of managed Cisco switches, I have to specify the broadcast address of the management network next to their address AND their netmask. Of course this is ...
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3answers
6k views

When to use routable vs non-routable IP addresses [closed]

As I understand it, there are several "non-routable" IP ranges: class A reserved space 10.0.0.0/8 class B reserved space 172.16.0.0/12 class C reserved space 192.168.0.0/16 class E reserved for ...
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33 views

IPtables on DD-WRT - Bridge communication

I have a Broadcom based Linksys WRT160n router running DD-WRT build 14896. The LAN and wireless clients get a 192.168.1.xxx IP address. They are on br0. I have a guest network in the 192.168.2.xxx ...
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1answer
161 views

Can I set up a VoIP phone to connect to it's gateway over VPN with different subnets?

A little background first: Currently, we have a main office and a remote office. They are connected via site-to-site VPN. Main office uses a Cisco router with DHCP at 10.10.10.0/24 while the remote ...
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2answers
82 views

Difference between connecting from inside and outside a subnet [closed]

Let's say provider granted me IP addresses 10.20.30.1 - 10.20.30.254, so the subnet address is 10.20.30.0 and mask 255.255.255.0. I set my router to 10.20.30.1 and computers to 10.20.30.2 and higher. ...
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1answer
452 views

Assign static IP by MAC address on openVPN

Our business is currently running a VPN using OpenVPN on a server we host ourselves. We have a need to lock down our internal network for client reasons - so the desired outcome is that only ...
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2answers
226 views

Set up 4 ip addresses with Subnet mask 255.255.255.252 (30)

i bought 4 ip addresses on OVH. Then they gave me this details: 84.84.184.176/30 Network IP: 84.84.184.176 Broadcast IP: 84.84.184.179 Gateway IP: 84.84.184.178 Netmask: 255.255.255.252 And they ...
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1answer
276 views

Ubuntu Server 15.04 as Router and DHCP Server with multiple subnets

at my company i got assigned to build a new network, where 1 ubuntu server manages DHCP for 3 subnets, allows communication of these subnets between each other and shares the connection to the public ...
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1answer
39 views

Notation used in Router configuration diagrams

I was listening to an MPLS tutorial on youtube.MPLS tutorial I came across this diagram. I am not that familiar with router configuration.My questions are as follows. 1) what does G1/0, G2/0, G3/0 ...
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23 views

Why can't my VPN Clients connect to addresses on a different subnet?

So, I've just transitioned our network from a class C to a class A. At the moment, I've got the router configured to hand out DHCP from 10.0.0.101 to 200. On our Windows 2008 domain server, I've ...
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3answers
149 views

Peer to peer communication in complicated multi-subnets LAN

We are developing a P2P application and stucked at the part of making communication between 2 peers which are in same local LAN but 2 different subnets. We know that there are a lot of cases that 2 ...
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1answer
102 views

AWS Private subnet not redirected to NAT Instance

AWS is not setting up properly default gw for instance in private subnet. NAT address: ec2din i-ef7f8a3a|grep PRIVATEIPADDRESS PRIVATEIPADDRESS 172.16.0.31 ROUTING TABLE configuration: ec2drtb ...
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1answer
83 views

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

I have OpenVPN Access Server running on AWS. 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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261 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
1k 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 ...
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2answers
1k 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. ...
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1answer
2k 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 ...
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2answers
158 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 ...
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1answer
270 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 ...
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2answers
1k 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) ...
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1answer
117 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 ...
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1answer
184 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 ...
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2answers
74 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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1answer
57 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 IP'...
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29 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 (...
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1answer
50 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: ...
3
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609 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 help....
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1answer
232 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 ...