NAT CISCO PACKET Tracer Settings. List of commands for configuring NAT:

For converting private addresses into global (routes on the Internet), NAT is used.

In addition to the possibility of access to the external network (Internet), NAT has several more positive aspects. So, for example, the broadcast of network addresses allows you to hide the internal structure of the network and limit access to it, which increases safety. And this technology allows you to save global IP addresses, since many hosts can be released under one global address on the Internet.

Overloading. allows you to convert several internal addresses into one external. For such a broadcast, ports are used,

Therefore, sometimes such NAT is called Port (Port Address Translation). FROM

by using Pat, you can convert the internal addresses into the external address, set through the pool or through the address on the external intese.

Dynamic Nat Configuration with Packet Tracer

Before This Article, We have Talked ABOUT STATIC NAT Configuration. HERE, We Will Talk ABOUT ANOTER TYPES OF NAT, Dynamic Nat Configuration On Packet Tracer. As in Static Nat, in the Dynamic Nat Configuration, the Interface Must Be iDentified as Inside and Outside Again. The We Will Define A Dynamic Address Pool On the Nat Router. The IP Address Will Be Choosen in this Pool to Assign as Source IP Address.

We Will Use Dynamic Nat Topology Below for Oour Dynamic Nat Configuration Example. And We Will Use Cisco Packet Tracer as Network Simulation Program.

You can download the Cisco Packet Tracket Tracer Example with Pkt Format at the End of this Lesson.

YOU CAN ALSO Download All the Packet Tracer Examples with Pkt Format in Packet Tracer Labs Section.

Dynamic NAT (Network Address Translation) Configuration Topology in Our Dynamic Nat Configuration on Packet Tracer, We Will Have Networks Again, One Local and One OUTSIDE NETWORK. In Local Network, We have Three PCS and We Will Provide Internet Access to these PCS. OUR Dynamic Nat Configuration Topology on Packet Tracer Will Be a Small Simulation of Real World Office Internet Accesses.

Interface IP Configurations

FIRSTLY, BeFore Dynamic NAT Configuration, We Will Prepare OUR NETWORK WIR IP Configurations on PCS and Routers. We Will Provide Full Connectivity end to end before starting OUR NAT Config.

OUR PCS on Packet Tracer Will Be Configured with Below IP Addresses.

PC0: 10.0.0.2 255.255.255.0 GW: 10.0.0.1 PC1: 10.0.0.3 255.255.255.0 GW: 10.0.0.1 PC2: 10.0.0.4 255.255.255.0 GW: 10.0.0.one

FIRSTLY Let’s Check The Ping Packet’s Source Address how We are Pinging From PC 1 to Router2. A2 YOU Can Seelowe B, The Source Address Will Be The PC 0 ‘S IP Address. To see the packet you mustble nat debug mode on router2 by “Debug IP Nat” Command.Check The Below Screenshots.

Pat Configuration with Packet Tracer

In some Cases there be Hundreds of Inside Local Addresses and At the Same Time Your Global IP Addresses Can Be Limited. At this time you can use instaid of static and Dynamic Nat Translation. Here, We Will Learn Pat Configuration with Cisco Packet Tracer.

Here, with Pat (Port Address Translation), We Translate Each PC to A Unique Port Number of A Single Public Address.

You can download Packet Tracer Example with Pkt Format Geere.

YOU CAN ALSO Download All the Packet Tracer Examples with Pkt Format in Packet Tracer Labs Section.

FIRSTLY WE IDentify the InterFaces AS Inside and Outside as Before Static and Dynamic Nat Configurations. Here, We Will Use The Same Topology Like Dynamic Nat Configuration Article. BecAuse, For Pat Configuration, We Need a Small Change on the Configuration.

Pat (Port Address Translation) Configuration Topology Here, We Will Start with The IP Address Configurations First.

OUR PCS on Packet Tracer Will Be Configured with Below IP Addresses.

PC0: 10.0.0.2 255.255.255.0 GW: 10.0.0.1 PC1: 10.0.0.3 255.255.255.0 GW: 10.0.0.1 PC2: 10.0.0.4 255.255.255.0 GW: 10.0.0.one

Now, Let’s do the Classical Nat Configuration and Plus Pat Configuration (Overload).

After that Will Use The Below Commands for Pat Configuration:

Here, Any Match Interface with Access-List 10, Will Be Translate with Overload to the Serial Interface IP Address. The Secret Key Word of Pat Configuration is “Overload”.

YOU CAN ALSO Download All the Packet Tracer Examples with Pkt Format in Packet Tracer Labs Section.

Static Nat Configuration in Packet Tracer

This Tutorial Gives a Simple Step by Step Explanation of Configuring Static Nat in Packet Tracer.With Static Nat a Router or A Firewall Maps One Private IP Address to One Public IP Address.

Now let’s configure this in Packet Tracer.

The Configure Basic IP Addressing on the Router, PC and Server.

Router

PC: IP Add 192.168.one.10 Subnet Mask 255.255.255.0 Default Gateway 192.168.one.one

Server: IP Add 200.0.0.10 Subnet Mask 255.255.255.0 Default Gateway 200.0.0.one

Now, to configure static nat on the router, these are the stps:

one.Configure Private/Public IP Address Mapping USING IP NAT Inside Source Static Private_id Public_id Command.

2.Configure The Router’s Inside Interface IP Nat Intercide Command.

3.Configure The Router’s outside Interface IP NAT Outside Command.

Now Ping the Server from the PC to Test Connectivity and Start Off Address Translations.

The PC Uses Its Private IP Address When Sending a Request to the Router. R1, Which Serves AS a Default Gateway, Receives The Request, Changes The Private IP Address of the Public One, The Fornest To the Internet Server.The Server Responds to the Router with A Packet Destined to the PC.The Router Looks Up in Its Nat Table and Changes The Destination IP Address to the Private IP Address of the PC.

To Verify Nat, We’ll Use The Show IP Nat Translations Command:

From the Picture Abo, You can object the private IP Address (Inside Local) of the PC Has Been Translate IP (Inside Global). Outside Local Represents The Server (An Outside Host).

Static Nat Configuration with Packet Tracer

In this Example We Will Configure One of Nat Types, Static Nat (Network Address Translation) On Packet Tracer. For OUR Static Nat Configuration, We Will Use the Topology Below.

You can download the Cisco Packet Tracket Tracer Example with Pkt Format at the End of this Lesson.

YOU CAN ALSO Download All the Packet Tracer Examples with Pkt Format in Packet Tracer Labs Section.

In this nat topology, We Will Configure Static Nat on Router1. We WWILL USE Router and Router2 AS Host Devices (For Example Like PCS).

Interface Configuctions

Static NAT (Network Address Translation) Configuration Topology Herastly We Will Configure IP Addresses on Three Routers. And the We Will Write Static Route from Both Ends to Others. For IP Connectivity, Lastly We Will Ping from One End to Other End. Inter this Verification, OUR Static Nat Configuration Topology Isa Ready for Our Nat Configuration.

In Router0 Wil Use Private Block IP Address, BecAuse We Will Think that thisa isa OUR Local Network. In Router2, We Will Use Public Block IP Addresses. Router2 Will Be Like Any Place on Internet.

Inside Local: 10.0.0.1 Inside Global: 212.100.100.ten

Outside Local: 212.100.100.1 Outside Global: 212.100.100.one

We Will Also Set “No IP Routing” on Host Devices (Router0 and Router2) and Configure the Default Gateway Address of Host Devices.

AFTER IP Connectivity, Let’s Check The Packets Sitation by Openning Debug with “Debug IP ICMP” Command. Till Now, We DID Not Configure Any Nat on Packet Tracer. We Will only See The Packets Source and Destination Before Static Nat.

YOU CAN ALSO Download All the Packet Tracer Examples with Pkt Format in Packet Tracer Labs Section.

Communication lines

Using the communication lines, the connections of the network nodes are created into a single topology and at the same time each type of cable can be connected only with certain types of devices intenses (rice. one.7).

Automatic type. with this type of connection, Packet Tracer automatically selects the most preferred type of connection for selected devices.

Console. console compound. The console connection can be made between PC and routers or switches.

Direct copper. a copper cable of type twisted steam. Both ends of the cable are squeezed in the same layout.

Copper Crossover. Copper Cabel connection of type twisted steam. The ends of the cable are squeezed like a crossover.

Optics. connection using an optical cable, it is necessary to connect devices with optical intenses.

Telephone cable. cable for connecting telephones. Connection via a telephone line for a trimmer can be carried out between devices with modem ports. Example. PC calling for a network cloud.

Coaxial cable. connection of devices using a coaxial cable. Used to connect between cable modem and cloud.

Serial DCE and serial DTE. Connections via sequential ports for the Internet relations. To configure such compounds, it is necessary to install synchronization on the DCE side.devices. The side of DCE can be determined by a small “watch” icon next to the port.

Graphic menu

In Fig. one.8 shows the graphic menu of the program.

SELECT tool (select) can be activated by ESC key. It is used to identify one or more objects for further movement, copy or delete them.

Move Layout tool (to move the layer, hot key m) is used to scroll large networks.

PLACE NOTE tool (make a note, key n) adds text in the working area of ​​the project.

Delete tool (Delete, DEL key) deleys a dedicated object or group of objects.

The Inspect tool (check, key I) allows, depending on the type of device, view the contents of the tables (ARP. NAT. Tables of routing and dr.).

DRAWAPOLYGON tool (draw a polygon) allows you to draw rectangles, ellipses, lines and paint them in color.

Resize shape tool (change the size of the form, the ALTR key combination) is designed to change the sizes of drawn objects (quadrangles and circles).

NAT CISCO PACKET Tracer Settings

NAT (Network Address Translation). This is the process of broadcasting local (private) IP addresses into external (global), allows nodes with private addresses, exchange data on the Internet.

When configuring NAT, one integration should be defined as internal (connects to the internal private network), and the other as external (used to enter the Internet).

3 types of address broadcasts are used

Static (Static Network Address Translation)

Dynamic (Dynamic Address Translation)

Settings of the Static NAT (Static Network Address Translation)

Static NAT. compares a single internal local (private) IP address with a single global (public) IP address.

one.Creating a static route on the ISP side.

3.Setting up an internal integration in relation to NAT.

four.Setting up an external integration in relation to NAT.

As a result of IP address 200.ten.21.5 will always correspond to the internal IP-address 10.ten.ten.2, t.e. If we contact the address 200.ten.21.5 will answer Computer 1

Setting a dynamic NAT (Dynamic Address Translation)

Dynamic NAT. uses a pool of available global (public) IP addresses and appoints them an internal local (private) addresses.

one.Setting up the access list corresponding to internal private addresses, note that the return mask is used.

four.Setting up an internal integration in relation to NAT.

5.Setting up an external integration in relation to NAT.

Section 7. NAT service.

NAT (Network Address Translation). broadcasting network addresses, technology that allows you to convert (change) IP addresses and ports in network packages.

NAT is most often used to access devices from the network of the enterprise (at home) on the Internet, or vice versa for access from the Internet on any resource inside the network.

The network of the enterprise is usually built on private IP addresses. According to RFC 1918, three blocks were allocated to private addresses:

172.16.0.0. 172.31.255.255 (172.16.0.0/255.240.0.0 (/12))

192.168.0.0. 192.168.255.255 (192.168.0.0/255.255.0.0 (/16))

These addresses are not routed on the Internet, and providers should discard packages with such IP addresses of senders or recipients.

For converting private addresses into global (routes on the Internet), NAT is used.

In addition to the possibility of access to the external network (Internet), NAT has several more positive aspects. So, for example, the broadcast of network addresses allows you to hide the internal structure of the network and limit access to it, which increases safety. And this technology allows you to save global IP addresses, since many hosts can be released under one global address on the Internet.

NAT setting up on cisco routers under the control of iOS includes the following steps

Prescribe internal (inside) and external (outside) intenses

The internal integse is usually the one to which the local network is connected. External. to which an external network is connected, for example, the Internet provider.

Determine for whom (what IP addresses) should be broadcast.

Choose which type of broadcast to use

There are three types of broadcasts Static NAT, Dynamic NAT, Overloading.

Static NAT. Static NAT, converting IP addresses one to one, that is, one address is compared from the internal network with one address from the external network.

Dynamic NAT. dynamic NAT, transformation of the internal address/OV into one of the group of external addresses. Before using a dynamic broadcast, you need to set the NAT-Pool of external addresses

Overloading. allows you to convert several internal addresses into one external. For such a broadcast, ports are used, so sometimes such NAT is called PAT (Port Address Translation). Using Pat, you can convert internal addresses to the external address, set through the pool or via the address on the external intese.

Creating a list of IP, which has access to NAT:

IP Nat Inside Source List Nat Interface Fastethernet0/0 Overload

You can see the existing broadcasts with the “Show IP NAT TRANSLATIONS” command.

Debugging is launched by the “Debug IP NAT” command

Router (Config) #ip Nat Inside Source Static

Router (Config) #ip Nat Pool Name Start-Ip End-IP

Router (Config)#Access-List Permit [Source-WildCard]

Router (Config) #ip Nat Inside Source List Pool

Router (Config)#Access-List ACL-Number Permit Source-Ip Source-WildCard

Router (Config) #ip Nat Inside Source List ACL-Number Interface Overload

Laboratory work converting NAT network addresses.

In this work, it is necessary to solve the problem of displaying computers of the local network of the organization on the Internet. Local network is configured in private addressing. on the network 10.0.0.0, whose addresses do not have access to the Internet. To solve this problem, you need to configure the NAT service. The network diagram is presented in rice.7.one.

Create a network presented in the rice.one. Set the names of the devices and addressing, as shown in rice.one.

At the moment, NAT on the router is not configured, we can see this using the simulation mode.

Go to this mode and look at the composition of the package when passing through both routers (rice. 7.2).

When passing the package through the second router IP, the sender address has not changed (10.0.0.eleven).

Configure NAT on the router Router1.

To configure NAT on the router, we will need to perform the following steps:

Go to the Router1 settings, to the CLI tab

To enter the administrator mode, enter the Enable command (EN)

To enter the settings mode, enter the config t command

FASTETHERNET 0/0 integration integration, to which the workstations are connected. To configure NAT on a router, this must be indicated in the settings. This can be done using the following commands:

We declare the Inte Weener Inte Weeis:

Similarly, we set up the FASTETHERNET 0/1 integration, which is connected to the provider’s network, only with the difference that it will be the external NAT integration:

We declare the integration by an external NAT integration:

We set a pool of external addresses into which internal addresses will be broadcast. To set a pool containing only one address. the address of the external router integration. You need to enter the command:

Router (Config) #ip Nat Pool Natpool 11.0.0.0 11.0.0.1 Netmask 255.0.0.0

When setting the address pool, it is necessary to indicate the first and last addresses from the address of the address of the address. If in the pool 1 address (as in our case) it is necessary to drive it 2 times.

Router (Config)#Access-List 34 Permit Any

Important: 34. the number from 1 to 99 denotes the number of access list and set by the administrator. Any. a keyword means that the access list will allow packages with any address of the sender.

Finally, we enter the last team, which, in fact, includes NAT on Router0. The team undoubtedly is the main one, but without a task of all previous parameters, it will not work.

Router (Config) #ip Nat Inside Source List 34 Pool Natpool Overload

This command tells the router that all packages received on the internal integration and allowed by the access list number 34, the sender address will be broadcast to the NAT Pool “Natpool”. The Overload key indicates that the broadcasts will be overloaded, allowing several internal nodes to be broadcast to one IP address.

Now NAT is configured. We can make sure that by sending a package from any working station to the subnet to the Yandex server.ru (package will pass). If we consider the passage of the package in more detail by going into the simulation mode, we will see that when the package is passing through the Router1, the sender address has changed (NAT is configured).

Section 7. NAT service.

NAT (Network Address Translation). broadcasting network addresses, technology that allows you to convert (change) IP addresses and ports in network packages.

NAT is most often used to access devices from the network of the enterprise (at home) on the Internet, or vice versa for access from the Internet on any resource inside the network.

The network of the enterprise is usually built on private IP addresses. According to RFC 1918, three blocks were allocated to private addresses:

172.16.0.0. 172.31.255.255 (172.16.0.0/255.240.0.0 (/12))

192.168.0.0. 192.168.255.255 (192.168.0.0/255.255.0.0 (/16))

These addresses are not routed on the Internet, and providers should discard packages with such IP addresses of senders or recipients.

For converting private addresses into global (routes on the Internet), NAT is used.

In addition to the possibility of access to the external network (Internet), NAT has several more positive aspects. So, for example, the broadcast of network addresses allows you to hide the internal structure of the network and limit access to it, which increases safety. And this technology allows you to save global IP addresses, since many hosts can be released under one global address on the Internet.

NAT setting up on cisco routers under the control of iOS includes the following steps

Prescribe internal (inside) and external (outside) intenses

The internal integse is usually the one to which the local network is connected. External. to which an external network is connected, for example, the Internet provider.

Determine for whom (what IP addresses) should be broadcast.

Choose which type of broadcast to use

There are three types of broadcasts Static NAT, Dynamic NAT, Overloading.

Static NAT. Static NAT, converting IP addresses one to one, that is, one address is compared from the internal network with one address from the external network.

Dynamic NAT. dynamic NAT, transformation of the internal address/OV into one of the group of external addresses. Before using a dynamic broadcast, you need to set the NAT-Pool of external addresses

Overloading. allows you to convert several internal addresses into one external. For such a broadcast, ports are used, so sometimes such NAT is called PAT (Port Address Translation). Using Pat, you can convert internal addresses to the external address, set through the pool or via the address on the external intese.

Creating a list of IP, which has access to NAT:

IP Nat Inside Source List Nat Interface Fastethernet0/0 Overload

You can see the existing broadcasts with the “Show IP NAT TRANSLATIONS” command.

Debugging is launched by the “Debug IP NAT” command

Router (Config) #ip Nat Inside Source Static

Router (Config) #ip Nat Pool Name Start-Ip End-IP

Router (Config)#Access-List Permit [Source-WildCard]

Router (Config) #ip Nat Inside Source List Pool

Router (Config)#Access-List ACL-Number Permit Source-Ip Source-WildCard

Router (Config) #ip Nat Inside Source List ACL-Number Interface Overload

Laboratory work converting NAT network addresses.

In this work, it is necessary to solve the problem of displaying computers of the local network of the organization on the Internet. Local network is configured in private addressing. on the network 10.0.0.0, whose addresses do not have access to the Internet. To solve this problem, you need to configure the NAT service. The network diagram is presented in rice.7.one.

Create a network presented in the rice.one. Set the names of the devices and addressing, as shown in rice.one.

At the moment, NAT on the router is not configured, we can see this using the simulation mode.

Go to this mode and look at the composition of the package when passing through both routers (rice. 7.2).

When passing the package through the second router IP, the sender address has not changed (10.0.0.eleven).

Configure NAT on the router Router1.

To configure NAT on the router, we will need to perform the following steps:

Go to the Router1 settings, to the CLI tab

To enter the administrator mode, enter the Enable command (EN)

To enter the settings mode, enter the config t command

FASTETHERNET 0/0 integration integration, to which the workstations are connected. To configure NAT on a router, this must be indicated in the settings. This can be done using the following commands:

We declare the Inte Weener Inte Weeis:

Similarly, we set up the FASTETHERNET 0/1 integration, which is connected to the provider’s network, only with the difference that it will be the external NAT integration:

We declare the integration by an external NAT integration:

We set a pool of external addresses into which internal addresses will be broadcast. To set a pool containing only one address. the address of the external router integration. You need to enter the command:

Router (Config) #ip Nat Pool Natpool 11.0.0.0 11.0.0.1 Netmask 255.0.0.0

When setting the address pool, it is necessary to indicate the first and last addresses from the address of the address of the address. If in the pool 1 address (as in our case) it is necessary to drive it 2 times.

Router (Config)#Access-List 34 Permit Any

Important: 34. the number from 1 to 99 denotes the number of access list and set by the administrator. Any. a keyword means that the access list will allow packages with any address of the sender.

Finally, we enter the last team, which, in fact, includes NAT on Router0. The team undoubtedly is the main one, but without a task of all previous parameters, it will not work.

Router (Config) #ip Nat Inside Source List 34 Pool Natpool Overload

This command tells the router that all packages received on the internal integration and allowed by the access list number 34, the sender address will be broadcast to the NAT Pool “Natpool”. The Overload key indicates that the broadcasts will be overloaded, allowing several internal nodes to be broadcast to one IP address.

Now NAT is configured. We can make sure that by sending a package from any working station to the subnet to the Yandex server.ru (package will pass). If we consider the passage of the package in more detail by going into the simulation mode, we will see that when the package is passing through the Router1, the sender address has changed (NAT is configured).