address translaion 12

PRESENTED

BYMANISH KUMAR SINGHPAWAN KUMAR SINGH

ANURAG SINGHVISHAL GUPTA

CONTENTS

DEFINITION PROCESS TYPES ADVANTAGE DISADVANTAGE

DEFINITION

Address translation is defined as the translation of one type of address (logical address) to another type of address (physical address).

In other word address translation was originally developed to solve two problems :

1-To handle storage of IPv4 address

2- Hide network addressing schemes.

PROCESS OF ADDRESS TRANSLATION The address translation process can be

described as follows ---

1-Break the logical address down into page number and offset.

2-Use the page number as an index into a page table to find the corresponding page frame.

3-Using the frame number found there generate a physical address by concatenating the frame number and offset from the original address.

Translation tables are implemented in HW,

controlled by SW.

Virtual addresses

Physicaladdresses

Translation table

Data reads or writes(untranslated)

Types of address translation

Address translation comes in a variety of types which are given below-

1- NAT (network address translation)

2-PAT (Port address translation)

3- Dynamic address translation

4- Static address translation

. Network Address Translation (NAT) is a method of connecting multiple computers to the Internet (or any other IP network) using one IP address. This allows home users and small businesses to connect their network to the Internet cheaply and efficiently.

NETWORK ADDRESS TRANSLATION

Static Address Translations

Static address translation establishes a one-to-one mapping between a local and global address or local and global address/port pair. When specifying a static address translation or address/port pair translation, you issue commands to indicate how the translation is applied, along with more specific variables that further define the type of translation

Dynamic address translation, or DAT is the process of translating a virtual address during a storage reference into the corresponding real address.

DYNAMIC ADDRESS TRANSLATION

With Port Address Translation (PAT), also known as “overload” and [[Network Address Port Translation (NAPT), the customer may map several internal addresses to one public address. When using PAT, traffic attempts to engage the original source port. If the source port is fully utilized, PAT causes the traffic to find the first available port.

PORT ADDRESS TRANSLATION

ADVANTAGE OF ADDRESS TRANSLATION -

The advantage of address translation include-

1.Conservation of public addresses.

2.Protection of resources with private addresses from external devices.

3.No need for readdressing of devices when switching from one ISP to another.

DISADVANTAGES OF ADDESS TRASLATION

1.Each connection has an added delay.

2.Troubleshooting is more difficult.

3.Not all applications work with address translation.

THANK YOU