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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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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4 views

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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2answers
27 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
21 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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27 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: ...
0
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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, ...
0
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0answers
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 - ...
0
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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 ...
0
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0answers
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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0answers
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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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 ...
1
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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 -- ...
0
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2answers
47 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) ...
0
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1answer
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 ...
1
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2answers
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 ...
0
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0answers
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 ...
3
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41 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 ...
0
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1answer
28 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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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 ...
0
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1answer
34 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 ...
0
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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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2answers
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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 ...
0
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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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1answer
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"> ...
1
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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 ...
1
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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
173 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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34 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
120 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 ...
0
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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 ...
0
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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: ...
0
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1answer
31 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? ...
2
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1answer
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 ...
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1answer
63 views

Allow communication between two networks

+--------------------------+ +--------------------------+ | Office A | | Office B | | Technicolor TG784n v3 | | ...
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1answer
42 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 ...
0
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0answers
18 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 ...
0
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3answers
2k 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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0answers
28 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 ...
1
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1answer
73 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
70 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. ...
2
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1answer
207 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 ...
0
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2answers
108 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 ...
0
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1answer
182 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
33 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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21 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 ...
2
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3answers
106 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 ...