Exolab: Découverte NAT-RIP via Packet Tracer. Intitulé long. Activité Packet-Tracer de découverte et de mise en pratique : - Du NAT dynamique et statique - Du routage dynamique avec le protocole RIP, en version 2. Maquette à compléter par étape (au départ, équipements paramétrés au niveau des interfaces uniquement)
Network Address Translation or NAT is a mechanism of mapping local address on the inside interface of a router with global address on the outside interface. For outgoing packets, router will translate the source local address to a global address. Reversely, router will forward incoming packets for a global address to its local address. This is usually the scenario to enable hosts on LAN to communicate with the internet. In Cisco device, there are several methods to configure NAT. One of the methods will be explained in this article is to configure static NAT in Cisco IOS router. Static NAT is a manual mapping of local and global address as defined by the network administrator. The way to configure static NAT in Cisco IOS router consists of two steps that will be explained using example scenario with given topology as below 1. Define the inside and outside interface Defining the inside and outside interface correctly is the key to make NAT mapping works. Simply go to the interface configuration mode and then use command ip nat inside to make the interface as an inside interface. In a similar way, use command ip nat outside to make the interface as an outside interface. For the above scenario, the way to make f0/0 on R1 as the inside interface and f0/1 as the outside interface is shown below assuming the IP address for each interface and default route to internet has been configured before R1configinterface f0/0 R1config-ifip nat inside R1config-ifexit R1configinterface f0/1 R1config-ifip nat outside R1config-ifexit 2. Configure the static NAT mapping The command to configure static NAT mapping is ip nat inside source static [local address] [global address]. The command can be repeated many times as required but note that in Cisco IOS router one local address can only be mapped to one global address and vice-versa. Additionally, note that the global address must be in range of the subnet on the outside interface. In real practice, the global address usually provided by the internet service provider. For the above scenario, the command to map Server1 IP address to one of the available global IP address R1configip nat inside source static Verifying the NAT sessions To see if static NAT works as expected, try to do a ping from Server1 to address on the internet. Before static NAT is applied, ping from Server1 to will not work because R1 will forward the packet with source address of and it is not known on the internet in this case. Server> ping icmp_seq=1 timeout After NAT is applied, the source address of is masked by and it is an address that is known on the internet in this case. Therefore, ping from Server1 is success. Server> ping 84 bytes from icmp_seq=1 ttl=252 time= ms Use command show ip nat translations on the router to see the NAT session. See this example output for the above scenario R1sh ip nat trans Pro Inside global Inside local Outside local Outside global icmp - - - The output above shows the active sessions between local address and global address on the inside and outside interface complete with the protocol and port information. The inside global and outside global shows the IP address and ports as result of translation while the inside local and outside local shows the address and ports before the translation. From the output above we can see that static NAT mapping between local address of and global address on the inside interface has working successfully. One cool thing about static NAT is that it also works for incoming packets. To confirm this, do ping from the internet to Server1 global address. Internet>ping 84 bytes from icmp_seq=1 ttl=252 time= ms On R1, run command show ip nat translations again to see the session R1sh ip nat trans Pro Inside global Inside local Outside local Outside global icmp - - - And that’s how you configure static NAT in Cisco IOS Router. The following two tabs change content Posts I am IT practitioner in real life with specialization in network and server infrastructure. I have years of experience in design, analysis, operation, and optimization of infrastructure solutions for enterprise-scaled network. You can send me a message on LinkedIn or email to for further inquiry regarding stuffs that I wrote or opportunity to collaborate in a project.
CommandesCisco CCNA Exploration Introduction Cette documentation regroupe toutes les commandes utilisées sur les routeurs et commutateurs CISCO et vues dans les cours du CCNA Exploration. En introduction seront présentées les commandes permettant de configurer les bases du routeur et du commutateur tels que nom de l'équipement, mots de passe, banniÚre,
It is important to secure your Cisco devices by configuring and implementing username and password protection and assigning different Cisco privilege levels to control and restrict access to the CLI. Hence, protecting the devices from unauthorized access. In this article, we will discuss how to configure user accounts and how to associate them to the different Cisco privilege levels. Then, we’ll take a deep dive into their purposes and functions, as well as their importance in network security Level SecurityCisco IOS devices use privilege levels for more granular security and Role-Based Access Control RBAC in addition to usernames and passwords. There are 16 privilege levels of admins access, 0-15, on the Cisco router or switch that you can configure to provide customized access control. With 0 being the least privileged and 15 being the most privileged. These are three privilege levels the Cisco IOS uses by defaultLevel 0 – Zero-level access only allows five commands- logout, enable, disable, help and 1 – User-level access allows you to enter in User Exec mode that provides very limited read-only access to the 15 – Privilege level access allows you to enter in Privileged Exec mode and provides complete control over the By default, Line level security has a privilege level of 1 con, aux, and vty lines .To assign the specific privilege levels, we include the privilege number when indicating the username and password of the admin1 privilege 0 secret Study-CCNA1 Routerconfigusername admin2 privilege 15 secret Study-CCNA2 Routerconfigusername admin3 secret Study-CCNA3In this example, we assign user admin1 a privilege level of 0. Then, we assign user admin2 to privilege level 15, which is the highest level. For admin3, we did not specify any privilege level, but it will have a privilege level of 1 by try to verify the output of our configuration by logging in to each user. Enter the username and the corresponding password, starting with Access Verification Username admin1 Password Router>? Exec commands disable Turn off privileged commands enable Turn on privileged commands exit Exit from the EXEC help Description of the interactive help system logout Exit from the EXEC Router>Notice in the output above that the user admin1 is under User Exec mode and has only five commands- logout, enable, disable, help, and exit. Now, let’s log in as Access Verification Username admin2 Password Routershow privilege current privilege level is 15 RouterThe output above shows that user admin2 is currently in level 15, and we verified that by typing the show privilege’ command on the CLI. Notice also that we are in Privileged Exec mode. Lastly, let’s log in as Access Verification Username admin3 Password Router>show privilege current privilege level is 1 Router>When we logged in as admin3, we verified that it was in level 1 by typing the show privilege’ command on the CLI. Notice that we are in User Exec Levels 2-14You can increase the security of your network by configuring additional privileges from 2 to 14 and associating them to usernames to provide customized access control. This is suitable when you are designing role-based access control for different users and allowing only certain commands for them to execute. Hence, giving them restrictions to unnecessary commands and increasing the layers of security on the now assign privilege level 5 to a user. After that, we will configure privilege level 5 users to be in User Exec mode and allow them to use the show running-config’ admin4 privilege 5 secret Study-CCNA4 Routerconfigprivilege exec level 5 show running-configAll level 5 users now will be automatically accessing the User Exec mode and can now use the User Exec commands such as show running-config’ on the CLI. Let’s log in as user admin4 to verify Access Verification Username admin4 Password Routershow running-config Building configuration... Current configuration 57 bytes ! boot-start-marker boot-end-marker ! ! ! end RouterEnable Secret Command PrivilegeWe can also configure different privilege levels to passwords. Here, we will allow the enable secret’ command to access the Privileged Exec level. Use the enable secret level {level} {password}’ syntax as shown below. The command sets the enable secret password for privilege level secret level 5 Study-CCNA5We can verify our configuration as shown belowUser Access Verification Username admin5 Password Router>show running-config ^ % Invalid input detected at ^’ marker. Router>enable 5 Password R4show privilege Current privilege level is 5 Routershow running-config Building configuration... Current configuration 57 bytes ! boot-start-marker boot-end-marker ! ! ! end RouterIn our first attempt, notice in the example above that we do not have access to the show running-configuration’ command. That is because we are currently under privilege level 0. However, we can log in as a privilege level 5 user with the enable {privilege level}’ command, and from there, we can now access the show running-configuration’ our Free CCNA Study Guide PDF for complete notes on all the CCNA 200-301 exam topics in one recommend the Cisco CCNA Gold Bootcamp as your main CCNA training course. It’s the highest rated Cisco course online with an average rating of from over 30,000 public reviews and is the gold standard in CCNA training
1TP NAT/PAT NAT statique Étape 1 : ReprĂ©sentation de la topologie rĂ©seau sur le simulateur Packet Tracer. Étape 2 : Configuration des interfaces de deux routeurs. Étape 3 :
Last updated Save as PDF 11 NAT Translation on the MX Security Appliance maps specific public IP address to an internal IP address. This is useful when internal servers need to be accessed by external clients using multiple public IP addresses. This article briefly describes example configurations, considerations, and best practices for 11 NAT translation. Note Though similar, 11 NAT is different from port forwarding. For more information, refer to our documentation on 11 NAT vs. Port forwarding. Basic Configuration A basic but insecure 11 NAT configuration can be set up to forward all traffic to the internal client. This should be configured when a 11 NAT needs to be made on a quick notice, but is not recommended due to security reasons. When all ports are forwarded to a client, attackers using a port scanner can target vulnerable services or gain access to the internal server. Figure 1. Example of insecure 11 NAT configuration Figure 2. Illustrating an insecure 11 NAT configuration Detailed Configuration A more advanced configuration should include multiple rules and utilize a secondary uplink to provide redundancy for the web server. If one of the uplinks goes down, the secondary uplink is still in place to provide remote connectivity to the internal server. 11 NAT rules should also be configured to restrict specific remote IP addresses access to specific services such as RDP. Figure 3. Example of a secure 11 NAT configuration Figure 4. Illustrating an example secure 11 NAT configuration Additional Considerations When a 11 NAT rule is configured for a given LAN IP, that device's outbound traffic will be mapped to the public IP configured in the 11 NAT rule, rather than the primary WAN IP of the MX. Exceptions may occur when the MX is running some content filtering features that involve its web proxy. In this circumstance, outbound web traffic initiated by the 11 NAT LAN device will use the primary uplink as normal. Hairpin Routing Traffic sourced from the LAN of the MX that is destined for the public IP configured in the 11 NAT section will be routed to the private IP address associated with the configured mapping. In this process the MX will accept the packet on the LAN and re-write the IPv4 header. The rewritten header will be sourced from the MX's IP/MAC, or layer 3 interface, in which the destination client resides while also being destined for the private IP/MAC of the client mapped to the 11 NAT. This practice does add complexities and may also be achieved with more ease via static DNS records where applicable. In some cases, 11 NAT translation will not work properly immediately after installing a new MX or when using Link aggregation. Special considerations should be taken when configuring 11 NAT rules with Uplink preferences and multiple public IP addresses.
Dansune configuration PAT NAT64 avec état, le flux de paquets doit provenir du domaine IPv6 et avoir créé les informations d'état dans les tables d'état NAT64. Les paquets du cÎté IPv4 qui
Bonjour wiilg Effectivement dans les livebox il faut que l'IP Lan apparaisse dans les Baux DHCP Valides pour pouvoir la fixer avant de fixer une rĂšgle NAT. Dans la notice on peut lire non pas "en gĂ©nĂ©ral l'IP attribuĂ©e au boitier est mais "Adresse IP de destination. GĂ©nĂ©ralement, elle coĂŻncide avec l'adresse du routeur exceptĂ© le dernier numĂ©ro, qui doit ĂȘtre remplacĂ©e par 246." D'abord avec les LB on ne peut forcer l'IP dans les rĂšgles NAT tant qu'elle n'a pas Ă©tĂ© fixĂ©e au prĂ©alable dans Baux DHCP Statiques Ensuite "doit" ĂȘtre remplacĂ©e par 246, ce qui suppose que le constructeur l'a forcĂ©e Ă  cette valeur.!!! drĂŽle d'idĂ©e ou Alors, - comme tu dis qu'en local ça fonctionne, regarde si dans le menu de gestion de ton Nexho tu n'as pas accĂšs au menu de gestion rĂ©seau de ton terminal. SI oui Passe l'attribution IP Lan en auto. C'est la box qui doit attribuer l'IP, pas l'inverse.! Si tu y arrives OK. Passe via le DHCP de la LB, vĂ©rifie que cette fois tu vois ton terminal, fixe l'IP via Baux DHCP statiques et Ă©tablis la rĂšgle NAT avec le port externe indiquĂ© 6653. - si pas accĂšs Ă  la gestion rĂ©seau. Essaie de passer l'adresse IP de fin de la plage d'adressage DHCP de la LB Ă  255 si c'est possible ou une valeur supĂ©rieure Ă  246 . Et regarde si tu vois ton terminal cette fois. Si OK tu dĂ©roules fixe l'IP dans la LB avec l'IP en espĂ©rant que le fait que l'IP soit forcĂ©e Ă  la fois dans la LB + terminal ne va pas faire des Ă©tincelles.? puis rĂšgle NAT. Ensuite ton terminal doit ĂȘtre accessible de l'extĂ©rieur via l'adresse IP_Wan6653 Tu trouves l'IP Wan dans les paramĂštres Infos systĂšme onglet FFTH ou DSL de ta LB. Comme elle n'est pas fixe chez Orange, il te faudra mettre en place un DNS dynamique via No-Ip par exemple. Et ton terminal sera accessible Ă  tous les coups via l'URL http//mon_host6653 et bien http et non pas https Inspire-toi de ce tuto de Phidur pour le DNS dynamique. Il traite de l'accĂšs Ă  distance de la LB, mais le principe est le mĂȘme pour l'accĂšs Ă  un terminal derriĂšre la LB. CordialementDaniel35. Une erreur peut devenir exacte selon que celui qui l'a commise s'est trompĂ© ou non» Pierre Dac
Part1: Build the Network and Verify Connectivity. In Part 1 , you will set up the network topology and configure basic settings, such as the interface IP addresses, static routing, device access, and passwords. Step 1: Cable the network as shown in the topology. Step 2: Configure PC hosts. Step 3: Initialize and reload the routers and switches

Configuring NAT for multiple Vlans on a Cisco router is a challenge that many inexperienced Cisco network engineers have had to contend with at one stage of their careers or the other. While NAT implementation is really not a big deal, its successful implementation on a Cisco router configured for multiple vlans can give you a grief, if you do not know what you are doing. In my previous post, I shared with us on how to configure dhcp on a Cisco router with multiple vlans. You can find it here. In this post, using a slightly modified version of the previous network topology, I will share with us on how to configure NAT for multiple vlans on a Cisco router. Network topology Objective Our objective in this lab is to configure NAT for the three vlans represented in the network topology. We can NAT all three vlans to one public IP or to separate public IPs. For this demonstration, each vlan will be NATed to the public IP on the WAN interface of the router. Public IPs to be used in the NAT for multiple vlans Vlan 10 private subnet= Public IP= Vlan 20 private subnet= Public IP= Vlan 30 private subnet= Public IP= You may also like How to redistribute static routes into eigrp using Cisco Packet Tracer Configuring NAT for multiple vlans First, we create three access-lists to match the private subnets. Routerconfigaccess-list 10 permit Routerconfigaccess-list 20 permit Routerconfigaccess-list 30 permit Next, we create pools for the vlans. Routerconfigip nat pool timigate netmask Configure the NAT statement. Each statement will reference corresponding access-list and NAT pool for that vlan. See below. Routerconfigip nat inside source list 10 pool timigate overload Routerconfigip nat inside source list 20 pool timigate overload Routerconfigip nat inside source list 30 pool timigate overload The final step is to define the inside and outside interfaces. This is where most people run into trouble. They use the physical interface instead of the sub-interfaces. Where sub-interfaces are used for vlans, these sub-interfaces must be defined and used as the NAT inside interfaces. See below. Routerconfigint f0/1 Routerconfig-ifip nat outside Routerconfigint f0/ Routerconfig-subifip nat inside Routerconfig-subifint f0/ Routerconfig-subifip nat inside Routerconfig-subifint f0/ Routerconfig-subifip nat inside Routerconfig-subif Verification To verify that NAT is working as it should, we turn on debug on the router, using the debug ip nat command. After that, we run a ping from the computers on the LAN to the ISP router. The output below will be displayed on the core router. From the output above, we can see the source address being translated to as it heads out to destination and on the second link we see the reverse process of going to destination before it gets directed to

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configuration nat et pat cisco pdf