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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2answers
448 views
One big subnet with all clients an issue?
Disclaimer: Network rookie, might have wrong assumptions.
Got a basic subnet question that im interested in hearing your thoughts about.
Subnet: 192.168.251.0/24
Address Range for servers: ...
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1answer
144 views
VTP Domain on 2 Subnets
Let's say you have 2 different subnets (10.100.0.0/22 and 10.100.8.0/22) in one subnet. You've set up your own VTP domain. If I want to add the 2nd subnet in that same VTP domain, would there be any ...
2
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4answers
707 views
Best way of isolating VM's to protect network?
On our network (1.0/24) we have a number of servers. One of those servers is running VMware ESX with three virtual machines which are hosting various websites and applications to the outside world.
...
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2answers
322 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 ...
1
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2answers
156 views
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 ...
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2answers
134 views
What is the best IP/Subnet set up strategy for a multi-server webhosting setup?
Sorry for the mixed-up title, but let me try to explain better:
We run a hosting solution, which until now has supported shared hosting and VPSes. Easy enough.
We are now getting larger clients ...
0
votes
1answer
115 views
VPN tunnel, different subnet for all users?
We have a VPN setup for each of our three branches. I understand that each router should be on a different subnet to the router that it's connecting to, but do the routers need to be on a different ...
2
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2answers
3k views
Routing between subnets with one router?
I have a Draytek Vigor 2820 which is connected to three gigabit Netgear Layer 2 switches. Currently the network is fairly simple, 192.168.1.0/24.
One the network I have 7 servers, around 50 ...
0
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1answer
190 views
How many assignable addresses are needed for a router-to-router connection?
I have an address zone (let's say 150.41.0.0/16) and I want to subnet it optimally using VLSM. I have a number of VLANs, each with a minimum number of needed addresses, and a couple of ...
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3answers
829 views
How can I find my subnet mask?
The popular answer to the question " How does 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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2answers
124 views
Where do I learn about IP blocks and subnets? Or is there just a calculator that does it all for me? [duplicate]
Possible Duplicate:
How does Subnetting Work?
Amazon's elastic compute tool (among others) requires the ip block format for their command:
ec2-authorize websrv -P tcp -p 80 -s ...
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3answers
793 views
Are same IP address with different submask unique? [duplicate]
Possible Duplicate:
How does Subnetting Work?
In a same block of IPv4 addresses, can there be same IPs with different submasks?
For example, can I have this:
180.70.65.140/26
...
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3answers
373 views
5 IP Addresses on a multi-homed NIC, 4 ping-able, what's wrong with the 5th?
Dell Server, broadcom NIC, 5 IP addresses all on the same subnet. Let's say 100.100.63.67-71. Windows Server 2003.
From another system on the 100.100.63.* subnet, I can ping all IP addresses no ...
2
votes
1answer
89 views
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 ...
0
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1answer
106 views
How does this picture get broadcast address and the usable host addresses? [duplicate]
Possible Duplicate:
How does Subnetting Work?
I am not really sure how did this figure example get the broadcast address and the usable host addresses.
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3answers
2k views
Finding the first and last address of a block of IP addresses with subnet mask
I am not sure if this is the right place to make this question but I thought this is one of the most appropriate SE's site to make a question on networking. Please move it to other more appropriate ...
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4answers
271 views
How do I enable an interface to hand out IPs on a certain subnet on a Cisco switch?
I have telnet access to a Cisco switch, only I need to enable an interface so it can start handing out IPs on a certain subnet. What commands do I need to use to get to the interface config file or ...
2
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1answer
57 views
Recommissioning subnet, accommodating device with static IP address and unknown hostname in Windows network
My company recently bought an asset management appliance (a Dell Kace M300). The setup is supposed to be pretty painless; you essentially just attach an ethernet cable, power it on, and resolve a ...
3
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3answers
203 views
Subnetting Challenges
I am trying to plan out a network with the following requirements and am having problems trying to complete a subnet plan for my network.
The network consists of 3 routers that connect 3 different ...
0
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2answers
655 views
Enabling Samba Shares Across Subnets
I was curious how I could go about setting up SAMBA so that shares could be seen and used across different subnets. We have some Linux devices that are bound to Active Directory and we would like to ...
1
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1answer
630 views
Linux route to different subnet
Bit confused over how to handle a likely simple routing issue.
I VPN into my Cisco ASA on 10.1.x.x subnet. Now, I would like to not only interact with private 10.1.x.x, but also with dmz on ...
0
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2answers
2k views
VMware vSphere 5.0 - can't configure host on multiple subnets
Is there an easy way to allow a single vSphere 5.0 host communicate on multiple subnets and allow VMs hosted there to communicate on those subnets?
I've got a small farm of vSphere 5.0 that are ...
2
votes
1answer
218 views
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 ...
2
votes
1answer
642 views
How can I get connected to a network printer in a different subnet with Windows 7 Professional?
So we have a mixed node set on our network with Win XP Pro, Win 7 Pro, Ubuntu 11.04, Win 2k3 Server Std, etc all within in an Active Directory Environment. We also have network printers that are ...
0
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1answer
258 views
RRAS VPN Issues - Windows Server 2008 R2
I'm trying to setup a VPN on a new Windows Server 2008 R2 box that is running Hyper-V.
I have setup the VPN using the RRAS and can connect to this VPN from my PC - however I can't access any ...
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1answer
169 views
Openvpn: iroute for all theoretically reachable [public] IPs
I am testing the creation of an enforced default route of only public IPv4 space via OpenVPN. OpenVPN does not support 'iroute 0.0.0.0 0.0.0.0' out of the box, because it contains code that rejects ...
4
votes
4answers
1k views
Maximum Number of Hosts per Network
I recall reading this in some (I think) Cisco documentation years ago, but can't find it or any other reference to this recommendation.
Anyone know what I'm talking about? Anyone still follow these ...
2
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1answer
143 views
Issues changing netmask from /24 to /22 on local network
We currently have a network, 192.168.1.0/24. We are close to being out of numbers.
If we change the netmask on our servers to /22 (255.255.252.0) all equipment (hosts) with 192.168.1.xx/24 will still ...
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votes
3answers
2k views
Windows 2008 R2 DHCP for two scope on two interfaces
I'm setting up a brand new DHCP Server over Windows 2008 R2 Standard edition server, and I'm planning to serv two differents lan with this one.
Here is my configuration:
1 AD/DNS/DHCP Server with ...
0
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1answer
175 views
How to change my domain from 192.168.1.0/24 to 192.168.21.0/24
We are about to start using hosting service for the software we use and they've asked us to change it.
I'm sure I can figure out how to change the DHCP scope, but that's not what I'm worried about.
...
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5answers
3k views
Advice for configuring a SonicWALL NSA 2400 to use two subnets and L2 Bridge Mode
This post is not an exact duplicate of How to configure remote access to multiple subnets behind a SonicWALL NSA 2400 . However, I am having this problem, almost verbatim. Unfortunately, we even have ...
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2answers
2k views
How to join 2 different subnets in one domain
I have a DC win 2008 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 would like to know ...
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votes
1answer
97 views
Problem regarding sub-netting and sub-net mask [duplicate]
Possible Duplicate:
How does Subnetting Work?
An organization is allocated the IP block of 172.16.0.0/16. It has a head office and three branches each of which can have 500 to 4000 hosts. ...
2
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6answers
3k views
Find device with static IP on different subnet
I bought an used Lantronix Spider and I cant seem to see it on my network (from my routers dhcp table). So my idea is that the device is not configured to use DHCP and assigned a static IP instead ... ...
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2answers
150 views
How to find the subnet for a single IP?
I have always used the subnet tools on the web when our datacenters provide us with new ip blocks for our machines. However, I recently ordered more IPs from our European DC and they apparently just ...
9
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3answers
536 views
Creative IP/subnet/dns schemes
I've only administered rather small networks (<=25 nodes). Usually I put the gateway .1, dns/proxy as .10, mail at .20, printers at .30-39 and so on and so forth. I never directly use IP addresses ...
0
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1answer
75 views
Subnetting help and confusion [duplicate]
Possible Duplicate:
How does Subnetting Work?
I am a bit confused, I have been given an address 132.132.0.0/16 and i have to devise a scheme allowing for at least 396 subnets. I think i ...
0
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1answer
515 views
How to change Hyper-V VM network settings via WMI?
I am not sure where to post this question whether at programmers.stackoverflow.com or here. So please forgive this if i am at the wrong place.
My question is:
How to set Subnet Mask , DNS address ...
0
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3answers
922 views
Ubuntu 10.04: Two interfaces on a same subnet with a same gateway
My ISP has given me a 187.x.x.224/29 subnet. The gateway is 187.x.x.225 I have a Ubuntu server with 6 ethernet ports. The server does NAT routing and also acts as a webserver. My plan is to have eth1 ...
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3answers
2k views
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 ...
0
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1answer
199 views
PIX 506E with multiple external /24 subnets
I've got two internet accessible /24 subnets, lets say 11.22.33.0/24 and 44.55.66.0/24 which I want to pass to servers using a private 10.0.0.0/24 subnet behind a PIX 506E
e.g. requests to ...
1
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2answers
318 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 ...
0
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1answer
149 views
Difference between intervlan routing and policy based routing
i try to use a Cisco C3550 24 EMI to split a single Hostaddress from a 26er subnet. My idea is, on one port i connect the cable to the 26er subnet (vlanWAN for example), on the second port i connect ...
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2answers
316 views
Hazards of increasing network size by changing the netmask
We are running a small network with address range 192.168.0.0/24. So we only have 254 IPs available. We want to increase this range slightly, to allow more hosts in the network. So if I change the ...
1
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1answer
183 views
Can't connect to server, others can
I've set up a Webserver(port 80) and a Minecraft server. Me and my friends play on this server regularly and haven't had any problems connecting before this.
Now, one friend complains about not being ...
1
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3answers
1k views
Am I supposed to assign the broadcast IP somewhere?
This is a very basic question from a newbie point of view.
I have a dedicated server at Hetzner running Windows 2008 R2.
I bought a subnet of IP addresses to use in this server. They provided me a ...
0
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3answers
470 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 ...
0
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2answers
1k views
Connecting to Domain from different subnet
I am trying to connect to a domain controller that is on a different subnet..
The active directory domain controller/dns server (same box) is on the 192.168.0.0 subnet. Any computer on this same ...
2
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2answers
295 views
Bind Zones split by octet
Why are the reverse Zone files in Bind split by octets instead of subnets?
This is what I would expect to see:
subnets:
172.0.208/22
10.0.2.0/25
10.0.2.128/25
host# ls /path/to/zone/files
...
3
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5answers
621 views
Basic IP address structure
We currently have a few servers, around 30-40 workstations and 16 phones. Each device has a static IP address.
As an example the standard settings for a new workstation is;
IP: 192.168.1.XXX
...
