Routing Basics

Routing:

The procedure of connecting two or more different networks

(Or)

The procedure of define routes, protocols and to find best path in them by using algorithms and provide security.

Routing protocol:

It is used to determine the best path for the packets are data to travel from source to destination

Routed protocol:

Which carries the data in the established path is called Routed Protocol. Routed protocols are always assigned to an interface and determine the method of packet delivery.

Ex of routed protocols is TCP, UDP, IP, IPX, SPX, Apple talk.

Different Modes in a router & Booting Sequence

Different Types of Modes in a router:

1. User Mode à Router>
2. Privilege Mode à Router#
3. Global configuration Mode à Router(Config)#
4. Interface Global configuration Mode/ Interface Mode à Router(config-if)#
5. Line Mode à #Line Vty

   Line Modes:

   à Auxiliary mode

   à Console mode Vty - Used for Telnet & SSH

Setup for ISP Failover

  

Scenario: We want to create a network in which if one ISP fails the traffic should go through the   second ISP without our network going down.

VIP (Dynamic IP Pool)

Scenario: Configure the DIP Pool on firewall so that all users behind the firewall will be accessing internet using any IP address in the DIP pool.

VIP (Mapped IP) Configuration

Our aim is to access the server remotely using Static IP mapped to local machine.

VIP (Virtual IP – Port Forwarding)

Scenario: We have hosted a machine in the network with http (Port 80) and https (Port 443) running on it. When a remote machine will access the port 8080 it will be forwarded to port 80 to the hosted machine and port 1443 would be forwarded to 443 to the hosted machine

Service Based Access (Port Blocking)

Scenario: We have to configure firewall such that computers can access only limited number of service to the internet.