-4
votes
2answers
154 views

Exercise regarding public IP address and its “class C” [closed]

An exercise I am doing asks the following:- Identify what your public IP address is. Using public information sources, see what you can learn about your IP. If you don'ʹt find anything on your ...
0
votes
1answer
139 views

XenServer - VMs to access Internet, but should not be visible from the Internet

I have installed XenServer on my server at the Hetzner datacenter. I have bought an additional /29 subnet containing 6 usable IP addresses from them. I want to install more than 10 VMs on this ...
-1
votes
1answer
119 views

Several logical IP subnets within single physical Ethernet broadcast domain? [closed]

I'm using Xubuntu 12.04 and Wireshark to analyse network traffic in my ISP subnet I'm wired to. My system has the following IP configuration: IP Address: 10.10.103.28 /24 Subnet Mask: 255.255.255.0 ...
0
votes
1answer
48 views

Can a router connect an IP network on one interface, and use one of the network's IP on the interface to the internet?

This is part of a question from a networking class. A router has IP 202.55.0.5 on the local network 202.55.0.0/21(through eth0), and uses IP address 202.55.0.6 to communicate with the internet ...
-1
votes
1answer
80 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 ...
-1
votes
1answer
75 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 ...
3
votes
3answers
187 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 ...
-1
votes
1answer
124 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 ...
20
votes
4answers
1k views

Customer site is out of IP addresses, they want to go from /24 to /12 netmask… Bad idea?

One of my client sites called to ask me to change the subnet masks of the Linux servers I manage there while they re-IP/change the netmask of their network based on a 10.0.0.x scheme. "Can you change ...
0
votes
1answer
412 views

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 ...
1
vote
1answer
96 views

Adding Static IP's to the NIC

We are currently working on migrating a lot of new machines to our network, and my job this morning was to setup all of the IP Addresses. I worked on this all morning, and when I got back tonight I ...
2
votes
1answer
397 views

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 ...
0
votes
2answers
848 views

Restrict access to website in IIS to a range of IP addresses

I'm configuring a website in IIS6 to restrict access to a customer's IP address range. I've been given their IP address (81.145.41.114) and an IP range (172.17) which I am meant to allow access to. I ...
0
votes
1answer
249 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 ...
1
vote
3answers
2k 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 ...
2
votes
3answers
2k 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 ...
0
votes
3answers
4k 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 ...
3
votes
3answers
217 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 ...
4
votes
5answers
861 views

Tips and Suggestions IP Address Re-Addressing?

My ever evolving and expanding local area network is currently using a class-C address. My network consists of multiple subnets depending on site/location. 192.168.1.x is site HQ 192.168.5.x is ...
1
vote
3answers
726 views

Subnet Calculator [closed]

I need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test. The calculator ...