Questions tagged [subnet]

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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Inter-VLAN routing: multiple VLANs, only one should be accessible to all. Makes sense?

I am trying to segment our company's network. My main goal is to have many small broadcast domains instead of a gigantic one, so I thought of assigning one VLAN per department. However, we have many ...
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What are the security issues in creating a firewall between two subnets?

As I understand it, the hosts on different subnets cannot communicate with each other unless there is a router somewhere on both subnets that forwards traffic between them. I have have two subnets ...
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Use a dedicated subnet to connect all routers/firewalls?

I have a couple router/firewall boxes (pfSense, TMG 2010, ISA 2006) on my network that are stateful. Right now they all have an interface on the same subnet as most end user devices and servers. I ...
Oliver's user avatar
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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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How do I divide a network into smaller subnets using a single Layer 3 switch?

I have had trouble searching for help on this one, as most searches for VLSM, CIDR and layer 3 switching bring back very basic questions posted by students just starting their CCNA. I have a batch of ...
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IBM Proventia Firewall Possibly dropping packets between subnets?

I have a network that has 3 subnets, 10.1.4.0/24, 10.1.5.0/24, 10.1.9.0/24. They are all routed using an IBM Proventia Firewall. The firewall is fairly straight forward and everything seems to be ...
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setting up 2 subnets, Windows Clients (30 nodes), Linux Server, Samba, FOG

Its my first post on serverfault and my first time to setup this kind of network, so my apologies in advance if it is not well formed. I'm planning a small (education center) network that has about ...
neildaemond's user avatar
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ARP discovery on multiple subnets

I have an unmanaged switch which serves traffic belonging to different subnets. Lets say these are the subnets: 192.168.0.0/24 192.168.1.0/24 192.168.2.0/24 And few more subnets which I am not aware ...
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OpenVPN network sharing

For some hours I'm already trying to setup a virtual private network between two physical locations (Location A, 192.168.1.0/24), and (Location B, 192.168.2.0/24). I am forced to use a tunnel instead ...
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2 servers cannot see each other in internal subnet (192.168.1.10)

I have a few servers in one rack. They all have 2 network interfaces eth0 and eth1. On all, eth0 has a public IP address assigned which works well. I'm setting up a private subnet on the second eth1 ...
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What's required to enable communication between two IP ranges located behind one switch?

Within our co-located networking closet, we have control over two ranges of 254 addresses, e.g. 64.123.45.0/24 and 65.234.56.0/24. The problem is, if a host has only one IP address, or a block of ...
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Cisco, How to do a subnetting scheme using VLSM and RIP-2?

I'm studying for my CCNA exam and I have to create a VLSM scheme using RIP-2 for the following requirements: (this is an exercise) Use the class C network 192.168.1.0 network for your point-to-point ...
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ssh via static route on different subnet hangs after approx. 30-40 s

Before I had this setup: LAN: 192.168.1.0/24 (GW/router: 192.168.1.1) -> router 192.168.1.111 -> LAN2: 192.168.88.0/24 First router/GW pfSense box, second router Mikrotik (with firewall etc.). ...
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Subnet to subnet forwarding traffic

I'am wondering how to forwarding traffic from a gateway to subnet. network setup I have this working setup, Host A behind tunnel can ping HOST B 10.151.0.1 but not HOST C 10.151.0.2. If I TCPDUMP ...
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nfs mounts over wrong subnet when another mount happens first

I have a weird issue with an NFS server and clients that are connected over two separate private subnets. The private subnets are 10.1.0.0/255.255.0.0 and 10.2.0.0/255.255.0.0 addressed as .local and ...
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OpenVPN: Addressing remote LANs

I've been trying to solve this problem for a while now, but to no avail. We basically have an OpenVPN server to which our end devices need to connect. Some of those devices can directly connect to the ...
Kumi's user avatar
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Why would I get ping replies from a private IP outside of my subnet?

I have a computer with 2 network adapters, each on its own subnet. One is our private LAN, 192.168.1.0/24, the other is for the internet. The internet subnet is 10.251.85.161/27. When I ping-...
HypnoToad's user avatar
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Application receiving boradcast from different subnet

I've 2 Linux boxes with following description Box A: Kernel: Linux 2.6 IP: 172.19.1.99/24 Box B: Kernel: Linux 3.14 IP: 192.168.200.100/24 Connected with Layer 2 switch Both boxes run a UDP ...
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401.1 errors when access IIS web application from new subnet

I am currently reorganising subnets in my organisation. New subnet is 10.65.0.0/24 and old subnet is 172.16.0.0/21. Clients in new subnet are not able to access a web application in 172.16.9.0/24 - ...
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Does changing the openvpn server config affect already issued certificates?

We've got an OpenVPN server running that is in use, with a number of static clients defined and certificates issued. However, over time it's become apparent the the IP pool currently available isn't ...
Liam Wiltshire's user avatar
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Non-local IP for next hop in routing

I'm working with an MPLS network and I am slightly confused about some route entries. Interfaces are (these are fake IPs): eth0 10.10.10.1/24 (LAN) eth1 10.9.9.1/24 (MPLS) eht2 2.2.2.2/24 ...
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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 ...
Ilya Rakhlin's user avatar
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How do I prevent directed broadcast packets in Hyper-V using virtual network adapter

When I connect two physical subnets by using a Cisco Router, I can configure the router to disable directed broadcasts (that could be used for example to send Magic packets for waking up Computers ...
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Route public subnet to client location

Due to the fact that my ISP introduced CGN/DSLite and I still need public IPv4 addresses, I was thinking about tunneling an unused /29 that I own from my server to my local Linux box. After doing ...
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Openvpn different subnet with dynamic ip using client-config-dir (cdd)

Good Morning, I need some help for a specific configuration in a server. Let's say I have two kind of people that will connect to my VPN. Pepole from Group A and people from Group B. I need them to ...
LinChan's user avatar
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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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How to use 2 subnets on one network

I have some servers at a colocation. They've given us an IP range, subnet and gateway. Now we have run out of IP addresses and they've given us a new range of IPs but with a different subnet and ...
BGuy2010's user avatar
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OpenVPN subnet routing on openSuSE

First off: I have looked all over for a solution to this, but couldn't find anything. How can I make OpenVPN's subnet accessible to my LAN? BACKGROUND INFORMATION: I have an openSUSE 12.1 box that ...
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Howto maximize utilization of assigned subnet block for DMZ

I'm part time sysadmin for a small hosting company with currently 20 different public servers. We have a 27 subnet block that gives us a maximum of 30 usable IP addresses. That much I know, but how do ...
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Connectivity issues with dual NIC machine in EC2

I'm trying to get some servers set up in EC2 in a Virtual Private Cloud. To do this, I have two subnets: 10.0.42.0/24 - Public subnet 10.0.83.0/24 - Private subnet To bridge these two, I have a ...
Matt Sieker's user avatar
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SharePoint 2003 Site Can't be Seen Across Subnets

I apologize if this is a basic question. I've inherited a SharePoint 2003 server that has, apparently, always had this issue and I'm not all that familiar with the inner-workings of SharePoint. Some ...
kelleystar's user avatar
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linux, networking, setting up subnet

I have a group of servers (debian linux boxes) and each gets a public IP off eth0. Lots of data is processed and passed between the servers. I'd like to create a subnet between the servers off each ...
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How can I add more than 255 machines to a single Class C network? [duplicate]

Possible Duplicate: How does Subnetting Work? I'm mainly a programmer. I have no idea beyond some basic theory when it comes to Networking/Administrating. My university feels that we should ...
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How can I find my subnet mask?

The popular answer to the question " How does IPv4 Subnetting Work? " does a nice job in explaining subnets. I remember learning about the network classes back in CCNA class but that answer mentions ...
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How many subnets can I create (max) inside of the network 192.168.123.X/26? And why? [duplicate]

We discuss that topic but we have too different interpretations. That is why I'd like to know how to resolve this issue. What is the truth? Can I define max 64 subnets or max 4? Writing down an ...
erikbstack's user avatar
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Subnet calculator for MS Excel

I quite often use the handy subnet calculator here: http://www.subnet-calculator.com/ Which I find very useful. However, does anyone have details/a link for a version of this that offers similar ...
Martin's user avatar
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Am I meant to allocate a /64 to every host?

I have been reading conflicting sources and seeing different behaviours about how a CPE router should be assigning IPv6 addresses. RFC3633 seems to imply that each host should get /64, while RFC6204 ...
小太郎's user avatar
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Bypassing VLAN with known MAC address

I am evaluating subneting our network with a Layer 2 switch and VLAN. From what I know, VLAN only works on broadcast domain, and if I know the MAC address of a remote computer on the same switch, I ...
jackbean's user avatar
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3 answers
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In IPv4 Subnets - a /23 - How do we know which range to use? [duplicate]

Let's assume I don't know what my IP range is, or my default gateway, but I know my IP address is 192.168.5.38 and my CIDR Range is /23. How do I know what my IP range is? Is my range 192.168.4.0-...
Chris S's user avatar
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Can I use the CLI to reset an IP address from a different subnet?

I'm working with a small office network which has fifteen devices on 192.168.2.x. They want to add a print server to the network. Simple enough, except that the print server seems to think it's 192....
dwwilson66's user avatar
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multiple subnets on the same cisco switch port

We have several servers on colocation and now trying to re-organize the network by utilizing Cisco ASA 5505 as a router and Cisco 3750x series switch. Network topology is looking like that: ...
Eugene M's user avatar
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3 answers
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How can I create a VLAN on my extreme switch for a separate subnet/domain?

I'm putting together a small active directory implementation for a buddy of mine. I currently have 2 servers (one is the primary domain controller) and a couple clients. I need to test and run ...
ItsPronounced's user avatar
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2 answers
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Clients on Local Network — simple test?

I am developing a web system for my school (it's in PHP, but that's not important). The system needs to have different behaviors depending on whether or not the user is on the school network (...
baum's user avatar
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IP Address shortage/Subnetting

Facing a problem where we are running out of available network addreses, we are currently on bog standard 192.168.1.x range. Reading about making more ips available and subnets and think i have just ...
Ben Gillam's user avatar
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3 answers
739 views

IP Address Subnet [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? We currently have a: 192.168.3.0/24 Subnet. We are looking to make this subnet larger as we need about 500 IP addresses in the above range. ...
Adam Chetnik's user avatar
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1 answer
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Reach pc in the same network but a different subnet

PC 1 in subnet - 192.168.1.x PC 2 in subnet - 192.168.2.x Is it possible to access one pc from the other by its IP address without special router config? related: How to reach a device on a ...
Gobliins's user avatar
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Subnetting IPv6 addresses/routes

I would like to subnet the default IPv6 route into 2 network routes. The original default route was: default via fe80::218:74ff:fe27:9640 dev eth0 proto kernel metric 1024 I tried adding the ...
zer0stimulus's user avatar
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2 answers
823 views

Is subnetting worthwhile\possible to seperate out VOIP in my situation?

I'm ballparking the numbers here, but I have 50+ machines and around 30 hard VoIP devices. Unfortunately, 10 or so PCs use the 100Mb pass-through port from the VoIP phones and 2 PCs use softphones (+...
Desvio's user avatar
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4 answers
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DHCP helper with a single subnet and multiple scopes

First, a little bit about what we're trying to do. We are migrating from being multiple LANs (multiple subnets) connected over slow VPN links to a single MAN (single subnet) connected with gigabit ...
EightQuarterBit's user avatar
1 vote
5 answers
13k views

How do I separate my network into different subnets?

I appolgize in advance for any elementry questions, as it has been a LONG time since college and I had hoped to never subnet again... :) I want to subnet a 192.168.1.x with 8 segments. Each will not ...
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