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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Trying to create a subnetwork with dd-wrt [closed]
I have a very dumb router issued to me by my ISP. It won't allow much control over anything. No static routing. Won't recognise devices on its network that it didn't assign the address to. No wifi.
...
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2answers
40 views
Communication between different subnets with different masks [closed]
I was wondering if there is any way to communicate between two networks with different mask. For example:
Network 1: 192.168.0.0 / 29
Network 2: 192.168.0.8 / 28 (which takes from the last possible ...
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0answers
49 views
Identify Subnet class from ip address [closed]
This is my lecture question and I am just checking with the experts here, please help and not down vote as these are basics and I am just seeking help. Tks in advance
This is the question
Internet ...
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votes
0answers
28 views
rhel one server with two ip addresses with different subnet [closed]
I have a RHEL 6 Server. I have 2 ip's, one on the DMZ and another one on another segment. I need to have them communicate thru the IP's (meaning it needs to pass the firewall for the DMZ) but to no ...
0
votes
1answer
34 views
VMWare ESXi 4 not manageble from LOCAL subnet
I have an ESXi 4.1.0u3 standalone (clean install). Only vmnic0 is connected to management/clients. vmnic1 is temporarily connected to another network for transfering data. vmnic2 and 3 are teamed to ...
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1answer
42 views
Subnetting 2 subnets, 127 hosts on /24 class b network [duplicate]
I have an upcoming exam in networks communication. One of the available tasks for training on subnetting is the following:
Suppose you are an ISP with a 132.1.32.0/24 address block. If 2
...
0
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1answer
24 views
Limit Cisco IP phone to only one subnet ranges DHCP
We run stretched layer 2 and we have the e911 service setup to correspond for each location. We run different sub-nets for each location as well. I'm wondering if there is a way to limit a users ...
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votes
1answer
30 views
a special case about subnet mask calculation [duplicate]
I have an IP addresses 192.168.2.0 and a subnet 192.168.1.0/10
And I have two questions. (1) Is 192.168.1.0/10 legal? As the 9th least significant bit is not 0.
And if (1) is true, does 192.168.2.0 ...
0
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3answers
41 views
iptables for a /16 subnet with a /24 exception
simply put, i want to use these rules:
iptables -I FORWARD -i br0.105 -d 192.168.0.0/16 -j DROP
iptables -I FORWARD -s 192.168.0.0/16 -i br0.105 -j DROP
but with the exception of the ...
0
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0answers
19 views
Port forwarding from modem to a subnet [migrated]
I have a webcam server that requires port forwarding to be able to access it from Internet, but the webcam server is located in a subnet and I couldn't make it work.
Description of my setup:
1. There ...
0
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1answer
59 views
Using a CIDR range as a Routed Subnet?
I have a /29 subnet assigned by my ISP, with an SonicWALL office router and a Cisco voice router hooked up to a 'net-rail' of sorts with untagged VLAN switch ports connecting my ISP router's output ...
0
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2answers
54 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
51 views
Number of subnets in this network [duplicate]
Is it correct to say that there are 2 subnets in the network in the image below?
0
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0answers
32 views
“Destination port unreachable” when pinging computer in another subnet [migrated]
In my home network, I connect to the Internet through a router (192.168.1.1). I also have another router (192.168.1.15, 192.168.2.1), this one using OpenWRT, configured as a wireless client. One of my ...
4
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1answer
96 views
How does broadcasting work on a server with multiple IPs?
Say you have two dhcp servers, A and B.
Server A has two IP addresses, 10.0.0.1 and 10.0.0.2.
Server B has one IP address, 10.0.0.3.
Server A has two instances of isc-dhcp running, one specifying a ...
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0answers
31 views
Setup website with public load balancer and private application servers [closed]
I currently have a website which i have configured like the following
Public IPAddress1 - Runs apache load balancer, multiple instances of tomcat app server, database.
I would like to split this ...
0
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2answers
56 views
OpenVPN Allow Servers to talk to VPN Clients
I have setup a VPC in Amazon with 2 subnets. The public subnet has a ip range of 10.0.0.XXX and a private subnet with a ip range of 10.0.1.XXX my OpenVPN sits on 10.0.0.100 and hands out ip from the ...
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1answer
76 views
Why does Windoes not allow the subnet to be the same as the subnet mask? [duplicate]
In Windows, I can configure a network adapter like this:
Ip Address: 192.0.0.1
Subnet Mask: 224.0.0.0
but not like this:
Ip Address: 192.0.0.1
Subnet Mask: 192.0.0.0
Why?
Why can't the ...
0
votes
3answers
84 views
textbook CIDR subnet problems, the real world, and Cisco ip route [duplicate]
Assuming CIDR and classless addressing, the CCNA books I'm reading say
Pearson 640-822 official cert guide 2012, pgs 403-404: According to their method
S = P - N (subnet, prefix, host bits ...
1
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1answer
52 views
Can I split my colo WAN subnet? /27
I recently started colocating at a datacenter, and they provided me with a /27 subnet, let's say
192.0.2.112/27 , this translates to usable IP's .96 to .127.
Because of a requirement in my network, ...
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1answer
178 views
Do I need to have multiple MX records that point to different IPs that are in different subnets even if I only have one dedicated server?
I own and operate a single dedicated server that offers shared web hosting space to my clients including email services. Is it possible to have multiple MX records for each client domain, and have ...
2
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1answer
107 views
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 ...
1
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3answers
140 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 ...
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2answers
61 views
determine IP for device [duplicate]
I am configuring an eth1 interface on in Red Hat, but I don't understand exactly what the IP address should be.
I'm given an IP of 10.237.128.0/25.
This means that the NETMASK would be ...
0
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0answers
49 views
I have a very strange symptom in my network
I have a very strange symptom in my network, some times a ping to the remote computer doesn't work in the same subnet (same VLAN), for example:
[Local Computer (IP:10.10.10.2/16)] --- ping ---> ...
0
votes
1answer
44 views
Small remote network fileserver access
I need to connect 4 separate offices to the same file server remotely. To achieve this the offices will be connected over the internet with BT ADSL using LAN to LAN VPN routers with the following IP
...
0
votes
3answers
87 views
Wireshark Promiscuous Mode and multiple Subnets
Is it possible to Sniff traffic with Wireshark where the source IP and Destination IP are on different subnets (of the same network) and neither of them are your IP? NIC is Intel 82579LM.
1
vote
1answer
84 views
Configuring a firewall appliance with 2 VLANs - how are the outbound links on the firewall configured?
We just ordered a sonicwall NSA 4500 firewall and I am preparing a network diagram for its arrival.
We have 12 servers in a newly setup rack, a 48-port switch, and a Sonicwall NSA 4500 firewall
I ...
3
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1answer
86 views
Using Microsoft DNS to respond based on requesting subnet
In our enterprise Windows Active Directory environment, we have some 50+ subnets scattered across a large geographical area. We have a system at each site that supports the site by providing a ...
1
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1answer
75 views
VPNs and subnets
I have built my own router on a machine with 2 NICs, running Debian. The machine sees my public IP address on one side, and the internal network (192.168.42.0/24) on the other. I am trying to set up ...
2
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2answers
231 views
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 ...
3
votes
3answers
127 views
What's the formal definition of the magic number of a network? [closed]
I know what the magic number of a network is. I know how to compute it - 2 ^ ((32 - n) % 8). I know what it's used for and how to use it.
I don't how how to define it formally. In a recent interview ...
0
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1answer
48 views
redirecting router connections to different subnet
I'm pretty new at networking and I'm not sure how to make all router connections go to a different subnet.
For example my subnet mask is 255.255.255.0 and I have three scopes: 10.0.1.1-255 / ...
0
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0answers
34 views
Subnetting Examples [duplicate]
I dont really understand answer to this following question. Can anyone break it down into simpler way? I hope someone can help me understand this. Thank you.
assuming you have a 192.168.0/24. what ...
1
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1answer
82 views
Different Logical Subnet on same Physical network cause Linux Connectivity Issues
We have two Linux CentOS hosts, A and B.
A = 19x.2xx.6.4 (/24)
B = 19x.2xx.7.4 (/24)
Both these hosts are on the same physical switch. The reason why they are on different logical networks is ...
1
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1answer
199 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 ...
0
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1answer
57 views
How to add statically-assigned subnet to Cisco 887VAW router?
As an IOS neophyte, I've been struggling to configure our office's new Cisco 887VAW ADSL router. After much head-scratching I've managed to sort the ADSL end out, and configured the router to provide ...
0
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1answer
40 views
Unable to connect to device across subnet
I have a network printer (Sharp copier) that I am unable to contact from a different subnet . I am on 192.168.100.x. The printer is on 192.168.200.x. I can ping (or remotely connect to) every other ...
0
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2answers
54 views
Rgd: Subnetting about 370 hosts on a /24 Network
Rgd: Subnetting about 370 hosts on a /24 Network
I am doing subnetting for the following.
There is a school, which got level 1 which is main lobby and 5 levels of classrooms ( level 2 to 6 )
I ...
1
vote
2answers
84 views
How to connect, through a wireless router, to a subnet, and have the clients join AD domain?
First I'd describe my subnet A:
a AD controller, say, adcontroller.mydomain with IP 192.168.1.3
a DHCP and DNS server, say, dhcpdns.mydomain with IP 192.168.1.10
Now I have a CISCO WRVS4400N ...
1
vote
1answer
235 views
Best way to calculate optimal subnet masks for a range of IP addresses? [closed]
I thought I saw a tool like this once upon a time, but can't find it anymore...
Anyone know a tool that would take a free range of IP addresses (as in start / end) and calculate a set of submasks ...
0
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2answers
45 views
Manage subnetting from simple router
I want to setup two different subnets in the same physical network with one router, these are my questions:
Let's assume I want the first subnet like 192.168.1.0-254 and the second subnet like ...
1
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1answer
167 views
Network discovery across VPN and local subnets
This question is about interaction between VPN clients and local machines.
I have a simple network on the subnet 10.0.200.0/24. The router supports VPN. The router forces the VPN IP pool to be on a ...
1
vote
3answers
68 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 ...
0
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0answers
89 views
SBS 2011 - Domain Computers Being Kicked into Working Offline Randomly and Frequently
Here is our current setup:
2 locations connected to each other via site to site vpn which is handled by a Zyxel USG50 on each end. Each location has 2 subnets in use. Each location has special ...
0
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0answers
162 views
How to allow an ip range on nginx…?
I want to allow IPs from
190.195.0.0
to
190.195.255.255
So, in my nginx config i put:
allow 190.195.0.0/16;
deny all;
But it's not working. Any ideas? What am I doing wrong?
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1answer
86 views
need to figure out this subnet mask please is it correct? [duplicate]
Possible Duplicate:
How does IPv4 Subnetting Work?
The largest subnet has 300 hosts so I am trying to workout the number of host_id bits I require for the mask but I am confused as each ...
0
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0answers
58 views
Cascade two firewall/routers to have one as proxy
In my small office I have a setup like this:
{internet}->[dslmodem]->[firewall]->{LAN}
Now I want to add a proxy into this. It is a Linux-PC that has also a small webserver. It has two interfaces ...
0
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1answer
49 views
Routing table connected entries different than interface assigned IP address
I have a HP ProCurve A7102DL router which has eth1 and eth2 interfaces. I currently have eth1 set as my WAN and eth2 as my LAN side. My eth2 has three IP address assigned to it which are A.A.A.1, ...
0
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0answers
156 views
Unable to ping gateway
Host: Windows Server 208 w/fixed IP plus 4 secondary IPs on diff subnet.
Version: VirtualBox 4.2.6
Guest: Linux with fixed IP from Host's secondary IP list.
Host has x.x.153.82 fixed IP, with ...
