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LAN Network with Redundancy
Efforts By:-
Santanu Mukhopadhyay-A1607111013
Aditya Sharma-A1607111022
What is a LAN Network????
A local area network (LAN) is a computer network which extends in a small coverage of
geographical area (ex-home, school, computer laboratory, office building or group of buildings)
A LAN is composed of internally connected functional workstations and pc’, each capable of
accessing and sharing data and devices inside the network (ex- printers, scanners and data
storage devices, anywhere on the LAN).
The sole concept of network redundancy is to provide alternate and efficient paths for data to travel along
without any interruption.
Importance In our 21st century all networks are high-tech build and high speed. A simple example would be if you
have a single network connection from your core site to each remote office you connect with. What will
happen if the link went down?? In this section we will find the solution of this scenario to help designing
and plan for a backup solution that you can count on and one that is cost effective and will not break the
bank.
Network redundancy is very simple concept. If there is a single point of failure and it fails the network,
then there is nothing to rely on.
What is Network Redundancy?
Important steps to build redundancy
A risk analysis assessment must take place.
The core sites must be taken into
consideration if that is where the bulk of
network resources are located.
Routing and routing protocols need to be
considered.
Solutions exist only when specific routing
and switching (ex-HSRP,VRRP,GLBP)
protocols are applied the designing of the
network to achieve redundancy.
Procedure Creating VPN (Virtual Private Network)
Redundancy Protocols(HSRP,VRRP,GLBP)
Basic Routing
MPLS Routing
Applying Access List
Network Address Translation( Static & Dynamic) & Port Address
Translation (NAT Overload)
Redundancy Protocols HSRP
Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for
establishing a fault-tolerant default gateway. The protocol establishes a framework between
network routers in order to achieve default gateway failover if the primary gateway becomes
inaccessible, in close association with a rapid-converging routing protocol like EIGRP or OSPF.
By multicasting packets, HSRP sends its hello messages to the multicast address 224.0.0.2 (all
routers) for version 1.
VRRP
Virtual Router Redundancy Protocol (VRRP) is a networking protocol that provides for
automatic assignment of available Internet Protocol (IP) routers to participate as a host. This
increases the availability and reliability of routing paths via automatic default gateway selections
on an IP sub-network.
Commands for Configuring HSRPR3#config tR3(conf)#vlan databaseR3(vlan)#vlan 50 name ssalesR3(conf)#int ra fa 1/0 – 1R3(config-if-ra)#no shR3(config-if-ra)#switchport mode accessR3(config-if-ra)#switchport access vlan 50R3(config-if-ra)#exitR3(conf)#int vlan 50R3(config-if)#ip address 192.168.1.2 255.255.255.0R3(conf)#standby 8 ip 192.168.1.1R3(conf)#sh standby
VPN(Virtual Private Network)
A VPN is a type of a secured network that allows the provisioning of private
network services for an organization over the unsecured network using
tunneling protocols.
By the unsecured network, we mean a public or shared infrastructure such as
the internet or service provider backbone network. The shared service provider
backbone network is also known as the VPN Backbone.
VPN is provisioned using technologies such as Frame Relay and Asynchronous
Transfer Mode virtual circuits for long time. However over the past few years
IP and MPLS based VPN’s have been a part of innovations.
CISCO Packet Tracer Model
Basic Routing Router> Enable Router# Configure terminal Router(config) # int fa (0/0, 1/0) Route (config-if)# ip address (ip address) (subnet mask) Router(config-if)# no shutdown Router(config-if)#exit Router(config)#int serial 2/0 Router(config-if)# ip address (ip address) (subnet mask) Router(config-if)# no shutdown Router(config-if)# exit Router(config)#int serial 3/0 Router(config-if)# ip address (ip address) (subnet mask) Router(config-if)# no shutdown Router(config-if)# exit
No Shutdown command is used to change the state of Interface from UP to DOWN or from DOWN to UP.
RIP Routing( RIP V1,RIP V2)RIP V1
Router(configure)# router rip
Router(configure-router)#
(Connected Network1
address)
Router(configure-router)#
(connected Network2
address)
RIP V2
Router(configure)# router rip
Router(configure)# Version 2
Router(configure-router)#
(Connected Network1
address)
Router(configure-router)#
(connected Network2 address)
MPLS Routing It is a mechanism in high-
performance telecommunications
networks that directs data from one
network node to the next based on short
path labels rather than long network
addresses, avoiding complex lookups in
a routing table.
The labels identify virtual links (paths)
between distant nodes rather than
endpoints. MPLS can encapsulate packets
of various network protocols. MPLS
supports a range of access technologies,
including ATM, Frame Relay, and DSL.
A Label Switched Path is a path
via Label Switched Routers
(LSR) in a MPLS enabled
network. Packets are switched
based on labels applied to the
packet. LSP’s may be signaled
using the Tag Distribution
Protocol (TDP), the Label
Distribution Protocol (LDP) and
the Resource Reservation
Protocol (RSVP).
Access List Router # configure
Router(configure) #access-list udp 150 permit any ip address netmask port number
Router(configure)# access-list tcp 150 permit any ip address netmask port number
Router(configure)# access-list tcp 150 deny ip address netmask ip address netmask
Router(configure)# access-list tcp permit any any
Router(configure)# int s1
Router(configure-if)# ip access-group 150 in
Router(configure-if)# exit
Router(configure)# exit
NAT &PAT
Static NAT Router (config )# int e 0/0
Router (config-if)# ipnat inside
Router (config)# int s0/0
Router(config-if)# ipnat outside
Router(Config)# ipnat inside source static
(ip address)(ip address)
Dynamic NAT Router (config )# int e 0/0 Router (config-if)# ipnat inside Router (config)# int s0/0 Router(config-if)# ipnat outside Router(Config)# ipnat pool Amity ip
address ip address netmask
PAT
Router(config)# interface fastethernet
0/0
Router(config-if)# ip nat inside
Router(config)#interface serial 0/0/0
Router(config-if)# ip nat outside
Router(config)# ip nat inside source
list 10 interface serial 0/0/0 overload
Router(config)# access-list 10 permit
ip add. Subnetmask
Redundant LAN Connection
To handle a system communication failure that use to occur within or outside of
a server's local subnet. The server's
1. NIC Card
2. Default gateway
Steps
Go to Control Panel, Network and Dial-up Connections- Local Area Connection-
Properties.
Select Internet Protocol and click Properties.
On the General tab, click Advanced.
Clear the Automatic Metric check box at the bottom of resulting dialog box.
Enter the metric you want to assign to this NIC.
Conclusion(s)
We had done a practical project under the supervision of an
University for the first time in our life.
Minor Project has taught us all the networking operations which
are done in an organization.
Running Network programs in a stipulated time period makes any
student perfect and updated.
Going through the working of minor project, we had our broader
view about discipline and integrity of networking operations in an
organization.
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