Download LAN Connectivity

Mini Project
Seminar
Subnet Calculator
based on vlsm
Team Members –
Shrey Berry (200711100)
Vineet Kumar (200711128)
Under the Guidance of –
Mr. Kiran Gautam
Assistant Professor
Dept. of CSE
Given the IP Address and the Subnet Mask of the
Master Network, we need to divide the entire
network into a group of Sub – Networks.
The Network Administrator is required know the
entire Network Structure, which includes the
number of Routers, number of LANs, inter
connectivity between the network elements and so
on.
We need to use the Classless Inter Domain Routing
(CIDR) mechanism, which implements the concept
of Variable Length Subnet Mask.
We prefer this strategy for subnetting as it enables
us to conserve address space, making it possible to
define subnets of varying sizes,
VLSM is, in concept, a simple extension of standard
subnet masking. With VLSM, a number of subnet
masks are defined for a single network and used as
needed to create different-size subnets.
We develop an interface wherein, the Network
Administrator is able to describe the structure of the
Network.
The interface allows for taking as input the number of
Routers and LAN Segments, the Inter Connectivity
among them.
Having entered the appropriate inputs to the Interface,
the Software calculates the IP values for each
connection.
System Requirements:
Minimum:
1.6 GHz CPU
512 MB RAM
1024x768 display
5400 RPM hard disk
Recommended: 2.2 GHz or higher CPU
1 GB or more RAM
1280x1024 display
7200 RPM or higher hard disk
3.0 GB of available disk space for the full installation
Software Requirements:
Operating System :
Microsoft Windows XP
Windows Vista/Windows 7
IDE :
Microsoft Visual Studio 2008
Programming Language : C#
Platform :
ASP.NET
Other Applications :
Microsoft Office Word
Different Phases of
Development
Activity A : Feasible study of the problem and formulation of formal problem definition – 10 Days
Activity B : Requirement analysis and specification – 7 Days
Activity C : Literature study – 28 Days
Activity D : Coding and unit testing – 27 Days
Activity E : Integration and system testing – 26 Days
Activity F : Documentation – 9 Days
A
Duration of different activities
B
Activity
C
D
E
F
20
Sept
30
Sept
7
Oct
4
Nov
1
Dec
27
Dec
Activity A : Feasible study of the problem and formulation of formal problem definition – 10
Activity B : Requirement analysis and specification – 7
Activity C : Literature study – 28
Days
Activity D : Coding and unit testing – 27
Days
Activity E : Integration and system testing – 26
Activity F : Documentation – 9
Days
Days
Days
Days
5
Jan
Level 0 DFD / Context Diagram :-
Result
Subnet
Calculator
0
USER
Input
Level 1 DFD :-
Subnet
Mask
Input
Verify
Feasibilit
y
0.1
Feasible
Router
Subnets
0.2
Total IPs
Number of Valid IPs
Router IP and
Subnet Calculated
Detailed
Report
0.4
Report
LAN
Subnets
0.3
LAN IP and Subnet
Calculated
Master Subnet Mask
Number of Hosts
Master Subnet
Number of Valid IPs
Valid
Hosts
0.1.1
No. of Hosts
Assign
Block Size
0.1.3
Total Valid
IPs
Level 2 DFD :-
Variable Length Subnet Mask Table
Valid
Block Size
Router
IP
0.1.2
Number of Links
LAN IPs
Router IPs
Validate
0.1.5
Validation Result
Total IPs
0.1.4
Required
IPs
Number of Hosts
Level 3 DFD :No. of Hosts
Adjust to
Upper
Limit
0.1.3.1
Block Size
Adjusted
Update
number
of Hosts
0.1.3.2
VLSM Table
Updated
Generate
Result
0.1.3.4
Total LAN IPs
Sum up
Hosts
0.1.3.3
No. of Hosts
Feasibility Module –
/*
This module calculates the maximum number of IPs that are available from the Master Subnet
Mask. The total number of IPs required is calculated from the Router connectivity and the number
of hosts in each LAN segment. These two values are compared, and subnetting is performed if
and only if the available IPs is more than the total number of IPs required after subnetting.
Data Structure :
Rn – Total no. of Routers in the Network.
Rcn –Total number of Router Connections.
Ln – Total no. of LANs in the Network.
Li – Number of Hosts in LANi.
Aip – Total Number IPs available.
Rip – Total number of IPs needed for Router Connectivity.
Lip – Total number of IPs needed for LAN Connectivity.
Nip – Total number of IPs required for the Network.
t[8] – An Integer Array that stores permissible values of Lip.
Lip  0.
T[ ] = {2, 4, 8, 16, 32, 64, 128, 256, 0}
*/
Steps :1. Begin
2. Rip  Rcn * 4
3. Lip  Lip + func (Li)
4. Nip  Rip + Lip
5. if, Aip < Nip, then
6. Generate Error
7. else, proceed for Subnetting
8. End
Func (int Li) –
/*
This module takes the number of hosts in LAN segment (i) as its input. The total
number of IPs for the LAN segment is determined after comparing the number of
Hosts with the Standard Block Size of Subnet Masks.
*/
Steps :1. Li  Li + 2
2. t[8]  Li
3. for i  0 to 9, do
4.
for j  0 to 9, do
5.
if, t[i] <= t[j], then
6.
temp  t[i]
7.
t[i]  t[j]
Steps (contd.) :-
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
t[j]  temp
end if
end for
end for
for I  0 to 9, do
if, t[i] = Li, then
ki+1
end if
end for
Return t[k]
Procedure RouterSubnetting( ) –
/*
This procedure calculates the IP range for each Router Connection. Since, each inter router
connectivity requires just 4 IP values, so we can use the same Subnet Mask for all the Router
connections and hence, determine the IP Address values.
Data Structure :
Rn – Total no. of Routers in the Network.
Rcn – Total number of Router Connections.
Ip – IP Address of Master Network.
SMi – Subnet Mask for Router Connection Rij.
Ip  <Ip1.Ip2.Ip3.Ip4>
*/
Steps :1. Begin
2. for i  0 to Rcn, do
3.
for j  0 to 4, do
4.
if, Ip1 <= 255, then
5.
if, Ip2 <= 255, then
Steps (contd.) :6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
if, Ip3 <= 255, then
if, Ip4 <= 255, then
if, Ip4 == 255, then
Ip4  0
Ip3  Ip3 + 1
else
Ip4  Ip4 + 1
end if
if, Ip3 == 255, then
Ip3  0
Ip2  Ip2 + 1
else
Ip3  Ip3 + 1
end if
if, Ip2 == 255, then
Ip2  0
Ip1  Ip1 + 1
end if
end for
SMi  255.255.255.252
end for
Ip_L  Ip
end Procedure
Procedure LANSubnetting( ) –
/*
This procedure calculates the IP range for each LAN Connection. Since, the Subnet Mask of the
LAN segments depend on the number of hosts, we need to compute the IP Address range for
each LAN segment individually, keeping in mind the Block Size that the LAN connection belongs
to.
Data Structure:
Ln – Total no. of LANs in the Network.
Li – Number of Hosts in LANi.
Ip  Ip_L
*/
Steps :1. Begin
2. for i  0 to Ln, do
3.
for j  0 to Li, do
4.
if, Ip1 <= 255, then
5.
if, Ip2 <= 255, then
Steps (contd.) :6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
end for
25. end for
26. end Procedure
if, Ip3 <= 255, then
if, Ip4 <= 255, then
if, Ip4 == 255, then
Ip4  0
Ip3  Ip3 + 1
else
Ip4  Ip4 + 1
end if
if, Ip3 == 255, then
Ip3  0
Ip2  Ip2 + 1
else
Ip3  Ip3 + 1
end if
if, Ip2 == 255, then
Ip2  0
Ip1  Ip1 + 1
end if
Master Network :
Router Connectivity :
LAN Segments :
LAN Connectivity :
Report Generation :
The GUI provides nice and easy approach for the
user and system interaction.
Warning messages have been provided to indicate
errors during inputs provided by the users.
This software provides the facility to divide a large
network into smaller sub network.
This software is very user friendly, and provides a very
convenient method to subnet a large network.
Its use is restricted only to Classless networks and it cannot
be implemented in cases where the Network implements
Classful IP Addressing.
The maximum permissible limit to the number of routers
and LAN segments is 10. A further increment in the numbers is
possible by adding few lines of code to the existing project.
The report format generated by the system is fixed and any
changes to the report format could be done with the help of the
developers.
The system does not deal with other elements of the
network, such as Gateways, bridges, etc.
The system can have scope for incremental change.
We can increase the count of routers and LAN segments to realize
an enhanced implementation of the system.
The same could be setup on a college LAN and we can assign IP
addresses to each of the sub networks existing without wasting the
address space allocated to the college.
Reference / Bibliography –
Todd Lammle, “CISCO Certified Network Associate Study Guide”, Fifth
Edition, PBP Publications.
Richard Deal, “CISCO Certified Network Associate Study Guide”,
Fourteenth Edition, Tata McGraw Hill, 2006.
John Sharp, “Microsoft Visual C# 2005 Step by Step”, Prentice Hall of India,
2007.
Rajib Mall, “Fundamentals of Software Engineering”, Second Edition,
Prentice-Hall of India, 2008.
Stephen C. Perry, “Core C# and .NET”, Prentice Hall PTR, 2005.
Variable Length Subnet Mask:
http://www.tcpipguide.com/free/i_IPVariableLenghtSubnetmaskingVLSM.htm
Classless Inter Domain Routing:
http://www.tcpipguide.com/free/t_IPVariableLenghtSubnetMaskingVLSM.htm