Routing Basics

Routing is used for making a packet from a network appliance and sent through to the other tools disebuah different network.
If you do not have a network router, then clearly you do not do routing.
To be able to perform packet routing, there are things that must be known:
• Destination address
• neighbor routers from which a router can learn about a remote network
• Route all possible to network remote
• The best route for each remote network
Router stores routing table that describes how to find the network-network remotely.
The types of routing are:
• Static Routing
• Default Routing
• Dynamic Routing
IP Routing Process
IP routing process can be explained by using the following image:

Default gateway of the host 172.16.10.2 (Host_A) configured to 172.16.10.1.(Host_B) To be able to send this package to the default gateway, must be known hardware address of Ethernet 0 interface of the router (which is configured with the IP address 172.16.10.1). Why is that? In order for the package can be submitted to the Data Link layer, then encapsulated into the frame, and sent to a router interface that connects to the network 172.16.10.0. Host to communicate only with the hardware address on the local LAN. Important to understand that Host_A, in order to communicate with Host_B, should send the packet to the MAC address of the default gateway in the local network.

Static Routing
Static routing occurs if the admin to manually add the route-route in the routing table of each router.
Static routing has the clappers, the following advantages:
• No overhead (processing time) on the CPU router (router is cheaper than a dynamic routeng)
• No bandwidth used between the routers.
• Static Routing add security, because the administrator can choose to fill in the routing to access a particular network.
Static routing has the following disadvantages:
• Administration should really understand the internetwork and how each router is connected to be able to configure the router properly.
• If a network added to the internetwork, Administration must add a router-all these routes manually.
• Static routing is not suitable for large network-network because guard will become a full-time job itself.
Default Routing
The default routing is used for sending packets to manually add a network router to a remote destination that does not exist in the routing table, to the next hop router. Normally used on the network who have only one exit point.
Dynamic Routing
Dynamic routing is when the routing protocol used to find the network and update its routing table on the router. And this is easier than using static and default routing, but he will set you apart in terms of CPU processes on the router and bandwidth usage of network