Nousallons voir ici comment mettre en place la surcharge de NAT à l’aide d’un routeur Cisco, et avec à notre disposition un pool d’adresses IP Publiques. Dans une configuration où nous NAT(Network Address Translation) is a process of changing the source and destination IP addresses and ports. Address translation reduces the need for IPv4 public addresses and hides private network address ranges. This process is usually done by routers or firewalls. Host A request a web page from an Internet server. Page1 – NAT et PAT Page 2 Sommaire 1)Introduction 2)Terminologie 3)NAT statique 4)NAT dynamique 5)Le PAT 6)Configuration 7)Vérification Page 3 1) Introduction Le NAT Scaling IP Addresses - · PDF file Scaling IP Addresses NAT/PAT CCNA 4 . ReseauInformatique configuration des réseaux routeur et switch cisco , routage commutation,frame relay, nat,pat,ppp,vpn,pap,chap cours reseau informatique pdf icloud unlock Home Protocole de couche réseau IPv4/IPv6-Notion de routage-Routeur et configuration de base Chapitre 7 : Chapitre 9 : NAT pour IPv4-Nat et PAT statique et dynamique-Redirection de port Chapitre 10 : Découverte, gestion et maintenance des périphériques-Détection de périphérique avec le protocole CDP-Détection de périphérique avec le protocole LLDP-Protocole NTP reseauinformatique:configuration des réseaux routeur et switch cisco , routage commutation,frame relay, nat,pat,ppp,vpn,pap,chap PXNma. OK nawal....213On va tenter d'autres choses Essaye de réinitialiser Firefox et essaye avec la configuration non modifiée et sans plugins, personas, ...Essaye une réinitialisation usine de ta attention, avant la réinit usine assure toi de disposer de ton identifiant de connexion et du mot de passe associénote tous tes paramétrages spécifiques déjà enregistrés pages WIFI, DHCP, NAT PAT, ...Si la réinitialisation usine ne résoud rien, il te faudra appeler la hotline 3900 ou 3970 si contrat open.Ils te referont probablement refaire tous les tests que tu as déjà faits, il se pourrait qu'ils te proposent un échange de Faites confiance aux produits libres Firefox, Thunderbird, LibreOffice, Irfanview, VLC, 7-zip, FileZillaVotre machine vous en remerciera First of all, assuming that K router is ISP router, we need to remove nat configs from K router and add static routes on edge routers. there is also a duplicate IP address on serial interfaces. To make this NAT lab to work, we need NAT static entry on BB-S similarly what you have on DC router. Since you have same Private range on left and right sides, we need to hide those behind Nat. you can add on S router following entry ip nat inside source static you can test it using BB-K, an ISP router by pining Public IPs like or or newly added entry You cannot reach Private range from Internet, so you cannot ping any Normally and technically, to reach private web server from the Internet, routers will have static TCP NAT entries translating port 80 of Private IP to Public IP port 80. Example on BB-S has ip nat inside source static tcp 80 80 Regards, ML**Please Rate All Helpful Responses ** 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 Service, Instance, Communication – un ensemble de fonctions mis à disposition d’utilisateurs – une exécution unitaire d’un service pour des participants particuliers q Dans les télécoms un service permet à des partenaires distants d’échanger des médias qUne instance d’un service télécom est une communication’ 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.

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