DĂ©crireles concepts du routage et les Ă©lĂ©ments Ă  prendre en DĂ©crire quand utiliser NAT et PAT et comment les configurer sur les compte lors de la mise en Ɠuvre du routage sur le r Ă©seau
You are here Home / Cisco Routers / Configuring NAT on Cisco Routers Step-by-Step PAT, Static NAT, Port Redirection The depletion of the public IPv4 address space has forced the internet community to think about alternative ways of addressing networked hosts. Network Address Translation NAT therefore was introduced to overcome these addressing problems that occurred with the rapid expansion of the Internet. Even if NAT was suggested as a temporary solution, it has been adopted by all network hardware manufacturers, and it is considered a very useful technology, not only for IP address conservation, but also for many other purposes including security. Basically NAT allows a single network device a router, firewall etc to act as an agent between a private local area network and a public network such as the Internet. The purpose of this NAT device is to translate the source IP addresses of the internal network hosts into public routable IP addresses in order to communicate with the Internet. Some of the advantages of using NAT in IP networks are the following NAT helps to mitigate the depletion of the global public IP address space Networks can now use the RFC 1918 private address space internally and still have a way to access the Internet using NAT. NAT increases security by hiding the internal network topology and addressing scheme. Cisco IOS routers support different types of NAT as will be explained below. NAT has many forms and can work in several ways, but in this post I will explain the most important types of NAT. For the next 2 scenarios we will be using the following simple network 1. Overloading or Port Address Translation PAT This is the most frequently used form of NAT in IP networks. It uses the concept of “many-to-one” translation where multiple connections from different internal hosts are “multiplexed” into a single registered public IP address using different source port numbers. This type of NAT allows a maximum of 65,536 internal connections to be translated into a single public IP. This type of NAT is very useful in situations where our ISP has assigned us only a single public IP address, as shown on the diagram below. All IP addresses of the LAN network will be translated using the public IP of the router interface FastEthernet0/0 ip address ip nat outside ! interface FastEthernet0/1 ip address ip nat inside ! access-list 1 permit ip nat inside source list 1 interface FastEthernet0/0 overload 2. Static Port Address Translation Port Redirection Assume now that we have only one public IP address which is the one configured on the outside interface of our border router. We want traffic hitting our router’s public IP on port 80 to be redirected to our internal Web Server at IP interface FastEthernet0/0 ip address ip nat outside ! interface FastEthernet0/1 ip address ip nat inside ! ip nat inside source static tcp 80 80 3. Configuring Static NAT NAT can be performed both statically and dynamically. Static NAT simply maps one private IP address to a single public IP address, and this is the flavor of NAT we are discussing in this section. A Cisco router performing NAT divides its universe into the inside and the outside. Typically the inside is a private enterprise, and the outside is the public Internet. In addition to the notion of inside and outside, a Cisco NAT router classifies addresses as either local or global. A local address is an address that is seen by devices on the inside, and a global address is an address that is seen by devices on the outside. Given these four terms, an address may be one of four types Inside local addresses are assigned to inside devices. These addresses are not advertised to the outside. Inside global are addresses by which inside devices are known to the outside. Outside local are addresses by which outside devices are known to the inside. Outside global addresses are assigned to outside devices. These addresses are not advertised to the inside. Let’s jump right into static NAT configuration on a Cisco router as shown in the Figure below R1 is the router performing Network Address Translation NAT and has two interfaces Fa0/0 on the inside and Fa0/1 on the outside. The specific IP addresses involved are NAT Address Type IP Address Inside local Inside global Outside local Outside global Table 1 NAT Addresses for Figure Above You probably know very well how to configure IP addresses on router interfaces, so we skip those configuration steps and move straight to the interesting stuff. First, we have to assign Fa0/0 as NAT inside interface and Fa0/1 as NAT outside interface on R1. This would tell the router that interesting traffic entering or exiting these two interfaces will be subject to address translation. R1conf term Enter configuration commands, one per line. End with CNTL/Z. R1configinterface Fa0/0 R1config-ifip nat inside R1config-ifinterface Fa0/1 R1config-ifip nat outside R1config-ifend Now we would tell the router how to perform address translation and mention which IP addresses source or destination to re-write in packets moving between the inside and outside interfaces. Here we go R1configip nat inside source static Here, we are telling the router to perform NAT on packets coming into the router on the inside interface Fa0/0. More specifically the router would identify which of these packets have a source IP address of and would change it to before forwarding the packet out the outside interface Fa0/1. Similarly, return packets coming in at outside interface Fa0/1 would undergo translation of destination IP address. Let’s now verify if NAT is actually working as it is supposed to work. There are a couple of very useful Cisco IOS commands that can be used to do just that. Command show ip nat statistics displays the number of static and dynamic NAT translations, inside and outside interfaces, and the number of hits and misses. R1show ip nat statistics Total active translations 1 1 static, 0 dynamic; 0 extended Outside interfaces FastEthernet0/1 Inside interfaces FastEthernet0/0 Hits 0 Misses 0 CEF Translated packets 0, CEF Punted packets 0 Expired translations 0 Dynamic mappings Appl doors 0 Normal doors 0 Queued Packets 0 Command show ip nat translations displays the IP addresses for NAT translations. R1show ip nat translations Pro Inside global Inside local Outside local Outside global — — — As you see in the above output, we have one NAT entry configured with Inside global address and Inside local address specified. Outside local and Outside global addresses are blank because our NAT configuration does not change those addresses. Let’s now go to the PC and ping the Server before running the command show ip nat translations again to see if it makes any difference. R1show ip nat statistics Total active translations 2 1 static, 1 dynamic; 1 extended Outside interfaces FastEthernet0/1 Inside interfaces FastEthernet0/0 Hits 10 Misses 0 CEF Translated packets 10, CEF Punted packets 0 Expired translations 0 Dynamic mappings Appl doors 0 Normal doors 0 Queued Packets 0 R1show ip nat translations Pro Inside global Inside local Outside local Outside global icmp — — — As you can see in the above output, NAT is active as manifested by the appearance of an additional dynamic entry for ICMP protocol and some additional hits, corresponding to our ping attempt from PC to Server. We just configured and verified a simple NAT scenario translating only the source or destination not both at the same time IP addresses of packets moving between inside and outside interfaces. This sort of NAT configuration is called static NAT as a single inside local IP address is statically mapped to a single outside local IP address. Another important feature of NAT is static Port Address Translation PAT. Static PAT is designed to allow one-to-one mapping between local and global addresses. A common use of static PAT is to allow Internet users from the public network to access a Web server located in the private network. Let’s assume we intend to host a Web server on the inside on the same PC, that has an IP address The following configuration line would allow us to do just that R1configip nat inside source static tcp 80 80 This configuration line performs the static address translation for the Web server. With this configuration line, users that try to reach port 80 www are automatically redirected to port 80 www. In our case, is the IP address of the PC which is also the Web server. This configuration can be verified using the same two NAT verification commands show ip nat translations and show ip nat statistics. Notice that the address with port number 80 HTTP translates to port 80, and vice versa. Therefore, Internet users can browse the Web server even though the Web server is on a private network with a private IP address. Related Posts Comparison of Static vs Dynamic Routing in TCP/IP Networks Cisco OSPF DR-BDR Election in Broadcast Networks – Configuration Example How to Configure Port Forwarding on Cisco Router With Examples Adjusting MSS and MTU on Cisco 800 routers for PPPoE over DSL The Most Important Cisco Show Commands You Must Know Cheat Sheet
Fichier: TD13 Cisco Packet tracert Le : moyen + 1ere Page:1/4 CRÉATION ET SIMULATION D’UN RÉSEAU INFORMATIQUE METTANT EN OEUVRE LE NAT Objectifs de
Published On August 6á”—Ê°, 2019 0207 IP Addressing NAT Configuration Guide, Cisco IOS XE Gibraltar The Network Address Translation 46 NAT 46 feature solves IPv4 to IPv6 connectivity by providing a mechanism for connectivity of IPv4 hosts to IPv6 internet when dual stack and IPv6 tunneling solutions cannot be used. Note NAT 46 is supported only on Cisco ISR 4000 platforms. Feature Information for Connectivity Between IPv4 and IPv6 Hosts Using Stateless NAT 46 Restrictions for NAT 46 Information About NAT 46 Configuring Network Address Translation 46 Verifying the NAT 46 Configuration Feature Information for Connectivity Between IPv4 and IPv6 Hosts Using Stateless NAT 46 The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to An account on is not required. Table 1. Feature Information for Connectivity Between IPv4 and IPv6 Hosts Using Stateless NAT 46 Feature Name Releases Feature Information Connectivity Between IPv4 and IPv6 Hosts Using Stateless NAT 46 Cisco IOS XE Gibraltar Release The Network Address Translation 46 NAT 46 feature solves IPv4 to IPv6 connectivity by providing a mechanism for connectivity of IPv4 hosts to IPv6 internet when dual stack and IPv6 tunneling solutions cannot be used. Note NAT 46 is supported only on Cisco ISR 4000 platforms. Restrictions for NAT 46 Only Domain Name System DNS application layer gateway ALG is supported. Fragmented packet is not supported. Maximum Transmission Unit MTU discovery after converting to IPv6 packets is not supported. Virtual Routing and Forwarding-aware NAT 46 is not supported. Both NAT44 static, dynamic, and PAT configuration and stateful NAT46 configurations are not supported on the same interface. High-speed Logging HSL is not supported. Several IPv4 stateful features PBR, ZBFW, WAAS, WCCP, NBAR, and so on do not work after converting to IPv6 packets, and are not supported. High availability is not supported. Information About NAT 46 Overview of NAT 46 Scalability on NAT 46 NAT 46 Prefix Overview of NAT 46 The NAT46 solution solves IPv4 host to IPv6 internet connectivity. IPv4 hosts trying to reach a server, first initiate a DNS type A query packet. The NAT 46 router changes this to type AAAA query. When the query response is received, NAT 46 retrieves the IPv6 address from the response packet. An IPv4 address is allocated from the configured NAT 46 pool and an address binding is done for the retrieved IPv6 address and the allocated IPv4 address. An IPv4 address DNS response is sent to the IPv4 host. The source address of packets originating from IPv4 hosts is converted using a configured NAT 46 IPv6 prefix. The destination IPv4 address is translated to IPv6 address using pool address binding created during DNS packet flow. Example Configured Prefix IPv4 Address IPv4-Embedded IPv6 Address 20020DB8/96 20020DB8C000221 Scalability on NAT 46 There is no limitation to the number of private IPv4 addresses that can be supported because no sessions are maintained. The number of IPv6 hosts that can be represented by the IPv4 pool address should be scalable up to 40,000. NAT 46 Prefix The NAT 46 prefix cannot be same as the interface prefix. Neighbor Discovery Neighbor/Router Solicitation messages for the addresses in the NAT 46 prefix are not answered by the NAT 46 router. Hence, NAT 46 prefix cannot be same as the interface prefix. If a larger network smaller prefix that is less than 96 is obtained from the service provider, the network can be subdivided into multiple smaller networks and NAT 46 prefix can be configured with a smaller network prefix 96 bits. In addition, the NAT 46 router needs to be configured as a gateway or next hop router for the IPv6 hosts on an adjacent router of the service provider network. Configuring Network Address Translation 46 Procedure Step 1 enable Example Device> enable Enables privileged EXEC mode. Enter your password if prompted. Step 2 configure terminal Example Device configure terminal Enters global configuration mode. Step 3 interface type number Example Deviceconfig interface gigabitethernet 1/2/0 Configures an interface and enters interface configuration mode. Step 4 ip address ip-address mask Example Deviceconfig-if ip address Configures an IPv4 address for an interface. Step 5 nat64 enable Example Deviceconfig-if nat64 enable Enables NAT46 translation on an IPv4 interface. Step 6 exit Example Deviceconfig-if exit Exits interface configuration mode and enters global configuration mode. Step 7 interface type number Example Deviceconfig interface gigabitethernet 0/0/0 Configures an interface and enters interface configuration mode. Step 8 ipv6 enable Example Deviceconfig-if ipv6 enable Enables IPv6 processing on an interface. Step 9 ipv6 address {ipv6-address/prefix-length prefix-name sub-bits/ prefix-lenth Example Deviceconfig-if ipv6 address 2001DB811/96 Configures an IPv6 address based on an IPv6 general prefix and enables IPv6 processing on an interface. Step 10 nat64 enable Example Deviceconfig-if nat64 enable Enables NAT46 translation on an IPv6 interface. Step 11 exit Example Deviceconfig-if exit Exits interface configuration mode and enters global configuration mode. Step 12 nat64 settings nat46 enable Example Deviceconfig nat64 settings nat46 enable Enables NAT46 in the NAT64 settings. Step 13 nat46 v6 prefix ipv6 prefix/prefix-length Example Deviceconfig nat46 v6 prefix 2001/96 Configures the NAT46 IPv6 prefix. Step 14 nat46 v4 pool pool-name pool-address-range Example Deviceconfig nat46 v4 nat46_pool Configures the NAT46 pool address range. Step 15 end Example Deviceconfig end Exits global configuration mode and returns to privileged EXEC mode. Verifying the NAT 46 Configuration Use the show nat64 statistics command to view the NAT 46 statistics. The following is sample output of the command. SUMMARY STEPS show nat64 statistics DETAILED STEPS show nat64 statistics Example Router show nat64 statistics NAT64 Statistics Total active translations 0 0 static, 0 dynamic; 0 extended Sessions found 0 Sessions created 0 Expired translations 0 Global Stats Packets translated IPv4 -> IPv6 Stateless 0 Stateful 0 MAP-T 0 NAT46 30 Packets translated IPv6 -> IPv4 Stateless 0 Stateful 0 MAP-T 0 NAT46 30
RESEAUXIP ET ADMINISTRATION RESEAUX SOUS IOS CISCO RĂ©seaux Internes/Adressage privĂ©/NAT-PAT 802.1Q, Stick Routing, Switch L3 DURÉE 3 HEURES Au cours de ce TP vous allez configurer les fonctions NAT/PAT sur les routeurs d’accĂšs Ă  l’Internet (l’Internet est simulĂ© par les trois routeurs ISP). Vous allez aussi dĂ©finir des VLAN dans les rĂ©seaux internes de
You are here Home / Cisco Routers / Cisco Router Configuration Commands – CLI Cheat Sheet In a previous post, I have published a Cisco Switch Commands Cheat Sheet tutorial. Since these kinds of posts are useful as a reference for many people, I have decided to create also a Cisco Router Commands Cheat Sheet with the most useful and the most frequently used Command Line Interface CLI configuration commands for Cisco Routers. Cisco IOS routers are probably the most complete, versatile and feature-rich networking devices. There are whole books written about Cisco router configurations and commands. Therefore it’s not possible to create a cheat sheet with all of the CLI commands of Cisco routers in one blog post. However, the list below I believe summarizes the most important ones so its a good starting point for a networking professional. Although there is a wide range of Cisco router models, the commands below will work on most devices running IOS with no problems. Make sure to download the cheat sheet in PDF format for future reference by subscribing above. Show/Verification Commands Routershow version [Displays information about running IOS version, hardware model etc] Routershow flash [Displays information about Flash memory] Routershow ip interface brief [Displays interface status and IP addresses for all interfaces] Routershow ip protocols [Displays configured routing protocols such as RIP,EIGRP, OSPF etc] Routershow ip route [Displays the routing table] Routershow cdp neighbors [Displays information about directly connected devices] Routershow cdp neighbors detail [Displays Detailed information about neighboring connected devices] Routershow running-config [Displays currently running configuration] Routershow startup-config [Displays configuration in NVRAM which will be loaded after reboot] Routershow history [Displays all commands in the history buffer] Routershow tech-support [Send the output of this command to Cisco tech support when you open a support ticket in TAC] Saving and Deleting Configurations Routercopy running-config startup-config [Save the running config to NVRAM to be used at next reboot ] Routercopy running-config tftp [Copy the running config to a TFTPserver for backup] Routercopy tftp running-config [Load the saved configuration from TFTP server to DRAM] Routererase startup-config [Delete the startup config from NVRAM Device Name Routerconfighostname MyRouter [Set hostname for the router] Device Security Commands MyRouterconfigenable secret test1 [Sets encrypted secret password for Privilege exec mode “enable” mode] MyRouterconfig line con 0 MyRouterconfig password strongconsolepass MyRouterconfig login [Secure the console with a password] MyRouterconfig line vty 0 4 MyRouterconfig password strongtelnetpass MyRouterconfig login [Secure the telnet terminal lines with a password] MyRouterconfig service password-encryption [Encrypt all passwords on the device] Configuring Router Interfaces Serial interfaces MyRouterconfiginterface s0/0/0 [Entering into serial interface s0/0/0 configuration mode] MyRouterconfig-ifip address [Set ip address and subnet mask on the interface] MyRouterconfig-ifclock rate 64000 [Assign a clock rate] MyRouterconfig-ifno shut [Turns the interface on] Ethernet Ports MyRouterconfigint f0/1 [Entering into ethernet interface fastethernet0/1 configuration mode] MyRouterconfig-ifip address [Set ip address and subnet mask on the interface]] MyRouterconfig-ifno shut [Turns the interface on] Configure Routing Static Routing 1st method MyRouterconfigip route [ Network , = subnet mask of destination network , = next-hop address] 2nd method MyRouterconfigip route serial 0/0/0 [Same as above but instead of gateway you specify the exit interface] MyRouterconfigip route 150 [Set administrative distance of 150 if needed. For static route, default is 1] Default routing MyRouterconfigip route [Send all packets destined for a network not in the routing table to hop] OR MyRouterconfigip route serial 0/0/0 [Send all packets destined for network not in the routing table out serial 0/0/0 interface] Dynamic Routing RIP version 1 MyRouterconfigrouter rip [Enable RIP as routing Protocol] MyRouterconfig-routernetwork [ is the directly connected network we want to advertise] RIP version 2 MyRouterconfigrouter rip [Enable RIP as routing Protocol] MyRouterconfig-routerversion 2 [Enable RIP version 2. Version 1 is default] MyRouterconfig-routernetwork [ is the directly connected network we want to advertise] MyRouterconfig-routerno auto-summary [Turns off auto-summarization- optional] MyRouterconfig-routerauto-summary [Turns on auto summarization – optional] RIP Verification Commands MyRoutersh ip route MyRoutersh ip rip database MyRoutersh ip route rip EIGRP MyRouterconfigrouter eigrp 10 [Enable EIGRP process. 10 is autonomous system AS number, AS can be any number b/w 1 and 65535. All routers should be in the same AS to build a neighbor relationship.] MyRouterconfig-routernetwork [ is the network to advertise] MyRouterconfig-routerno auto-summary [Turns off the auto-summarization – Optional] EIGRP verification commands MyRoutershow ip eigrp neighbors [Displays neighbor table] MyRoutershow ip eigrp interfaces [Displays information for each interface running EIGRP] MyRoutershow ip eigrp topology [Displays the topology table. Shows feasible successors] OSPF MyRouterconfigrouter ospf 10 [Enables OSPF process number 10. Process ID is any number b/w 1-65535. It doesn’t need to be matched with neighbor routers] MyRouterconfig-routernetwork area 0 [Any interface with an address of is to be put into AREA 0 and will advertise and receive OSPF routes] OSPF Authentication Simple MyRouterconfigrouter ospf 10 MyRouterconfig-routerarea 0 authentication [Enables simple authentication. Password will be sent in clear text] MyRouterconfig-routerexit MyRouterconfigint s0/0/0 MyRouterconfig-ifip ospf authentication-key 1234 [Sets password to 1234 for AREA 0 authentication] MD5 Encryption MyRouterconfigrouter ospf 10 MyRouterconfig-routerarea 0 authentication message-digest [Enables MD5 password encryption] MyRouterconfig-routerexit MyRouterconfigint s0/0/0 MyRouterconfig-ifip ospf message-digest-key 10 md5 1234 [10 is the key id. This value must be the same on neighboring routers. Md5 indicates that MD5 algorithm is used and 1234 is the password and must be same on the neighboring routers] OSPF Verification Commands MyRoutershow ip ospf [Displays basic configured ospf information] MyRoutershow ip ospf interfaces [Displays OSPF interfaces information] MyRoutershow ip ospf neighbor [Displays all ospf neighbors and their states] MyRoutershow ip route ospf [Show routes learned by ospf] Configure Access Control Lists MyRouterconfig access-list 101 deny tcp any eq 80 MyRouterconfig access-list 101 permit ip any any [Configure an extended ACL to deny access to port 80 for network and allow everything else] MyRouterconfig interface fastEthernet 1/0 MyRouterconfig-if ip access-group 101 in [Apply ACL 101 in the inbound direction on interface fe1/0] Configure Network Address Translation NAT Dynamic NAT overload PAT MyRouterconfig interface fastEthernet 1/0 MyRouterconfig-if ip nat inside [Specify which interface will be the inside for NAT, the source IPs of packets coming to this interface will be translated] MyRouterconfig interface fastEthernet 1/1 MyRouterconfig-if ip nat outside [Specify which interface will be the outside for NAT, packets going out from this interface will be translated] MyRouterconfig access-list 1 permit MyRouterconfig ip nat inside source list 1 interface fastEthernet 1/1 overload [Access list 1 specifies that inside source network will be translated to the IP address of fastEthernet1/1. Very useful for providing internet access to internal private addresses] Static NAT MyRouterconfig interface fastEthernet 1/0 MyRouterconfig-if ip nat inside MyRouterconfig interface fastEthernet 1/1 MyRouterconfig-if ip nat outside [Define again the inside and outside NAT interfaces] MyRouterconfig ip nat inside source static [Private IP will be translated statically to Public IP one-to-one mapping] DOWNLOAD THE CHEAT SHEET AS PDF FILE Related Posts Comparison of Static vs Dynamic Routing in TCP/IP Networks Cisco OSPF DR-BDR Election in Broadcast Networks – Configuration Example How to Configure Port Forwarding on Cisco Router With Examples Adjusting MSS and MTU on Cisco 800 routers for PPPoE over DSL The Most Important Cisco Show Commands You Must Know Cheat Sheet
OutboundInbound. To configure Static PAT on a Cisco IOS router to match the translation depicted above, first designate the Inside and Outside interfaces, then apply the following commands: ip nat inside source static tcp 8080 73.8.2.44 80 extendable ip nat inside source static tcp 10.4.4.42 443 73.8.2.44 443 extendable.
With static NAT, routers or firewalls translate one private IP address to a single public IP address. Each private IP address is mapped to a single public IP address. Static NAT is not often used because it requires one public IP address for each private IP configure static NAT, three steps are required1. configure private/public IP address mapping by using the ip nat inside source static PRIVATE_IP PUBLIC_IP command 2. configure the router’s inside interface using the ip nat inside command 3. configure the router’s outside interface using the ip nat outside commandHere is an A requests a web resource from S1. Computer A uses its private IP address when sending the request to router R1. Router R1 receives the request, changes the private IP address to the public one, and sends the request to S1. S1 responds to R1. R1 receives the response, looks it up in its NAT table, and changes the destination IP address to the private IP address of Computer the example above, we need to configure static NAT. To do that, the following commands are required on R1R1configip nat inside source static R1configinterface fastEthernet 0/0 R1config-ifip nat inside R1config-ifinterface fastEthernet 0/1 R1config-ifip nat outsideUsing the commands above, we have configured a static mapping between Computer A’s private IP address of and the router’s R1 public IP address of To check NAT, you can use the show ip nat translations commandR1show ip nat translations Pro Inside global Inside local Outside local Outside global icmp - - -Download 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
Configurationde base de Cisco ASA et configuration NAT Configuration de base de Cisco Expressway-e et d'Expressway-C Composants utilisés Les informations contenues dans ce document sont basées sur les versions de matériel et de logiciel suivantes : Cisco ASA 5500 et appliances de gamme 5500-X qui exécutent la version de logiciel 8.0 et
OK nawal....213On va tenter d'autres choses Essaye de rĂ©initialiser Firefox et essaye avec la configuration non modifiĂ©e et sans plugins, personas, ...Essaye une rĂ©initialisation usine de ta attention, avant la rĂ©init usine assure toi de disposer de ton identifiant de connexion et du mot de passe associĂ©note tous tes paramĂ©trages spĂ©cifiques dĂ©jĂ  enregistrĂ©s pages WIFI, DHCP, NAT PAT, ...Si la rĂ©initialisation usine ne rĂ©soud rien, il te faudra appeler la hotline 3900 ou 3970 si contrat open.Ils te referont probablement refaire tous les tests que tu as dĂ©jĂ  faits, il se pourrait qu'ils te proposent un Ă©change de Faites confiance aux produits libres Firefox, Thunderbird, LibreOffice, Irfanview, VLC, 7-zip, FileZillaVotre machine vous en remerciera Étapespour configurer PAT pour l'image rĂ©seau ci-dessus Ă  l'aide de CLI. Connectez-vous Ă  l'appareil Ă  l'aide de SSH / TELNET et passez en mode activation. Passez en mode config. The hardest thing about NAT in Cisco routers and ASA firewalls is understanding how to use the technology in real life. Tons of guide papers have been written, the Internet is full of gigabytes of information on the topic, yet the subject remains relevant. Truth is, 95% of absolute majority of people will only need to use just one of the two types of connections. 1 PAT Port Address Translation A bunch of internal IP addresses are translated into a single external IP address when connecting to the outside world. While each packet destined to outside networks is being processed by a router or a Cisco ASA, the correlation of the actual internal IP address and port number of the source of the TCP connection is being remembered, which allows to correctly perform the reverse translation and transfer return packets. This kind of NAT is used when you need to allow access FROM an internal network to external resources such as the Internet. 2 Static NAT This is translating addresses one-to-one. A specific public IP address is put together with an internal IP address. This kind of NAT translation is used when you need access FROM the outside world to a server or resource within the internal network or a DMZ. Summary If you need access from the internal LAN to the outside world, it is most likely that you will have to configure PAT. If you need access from the outside world to a certain internal resource, then you will have to configure static NAT. NAT configuration examples for the above cases Cisco ASA IOS below PAT global outside 1 interface nat inside 1 Static NAT static dmz,outside interface netmask Important! The keyword interface in this code specifies the devices own IP address that is assigned to the external interface If the translation is being made into another IP address from the pool of IP addresses belonging to the external interface, then that address is specifically mentioned. Cisco ASA IOS above PAT object-group network NET_LAN network-object nat inside,outside source dynamic NET_LAN interface Static NAT object network host nat dmz,outside static interface Cisco IOS Router PAT interface Ethernet X ip address ip nat inside interface Ethernet Y ip address ip nat outside ip nat pool POOL_PAT //No mistakes here. An external address is mentioned twice. ip access-list standard ACL_PAT permit ip ip nat inside source list ACL_PAT pool POOL_PAT overload Static NAT interface Ethernet Z ip address ip nat inside interface Ethernet Y ip address ip nat outside ip nat inside source static interface Ethernet Y Important! This article includes only the simplest configuration examples for NAT translations, on purpose. More complex examples are covered in articles about basic Cisco router and Cisco ASA configurations. Also there is a full explanation of port forwarding static NAT on Cisco ASA with configuration examples in this article. This article was written by Alexey Yurchenko Back to Table of contents

Note Make sure that the routers and switch have been erased and have no startup configurations. If you are unsure, contact your instructor. Required Resources ‱ 2 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable) ‱ 1 Switch (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable)

\n\n\n \n configuration nat et pat cisco pdf
Viewcommandes cisco du CSC MISC at HEC MAROC. Commandes Cisco CCNA Exploration Introduction Cette documentation regroupe toutes les commandes utilisées sur les routeurs et
FormulaireIOS Cisco – Patrick GIRARD / IP Training – Formation ISMIN 1 Configuration NAT/PAT – Mode configuration Configurer NAT (dĂ©but de commande) ip nat inside source PAT dynamique list NatList int s0/1/0 overload NAT statique static 92.126.97.164 PAT statique (redirection de port) static tcp 192.168.1.1 80 81.1.0.1 80 Liste de contrĂŽle pour le
Lune de ces solutions, largement mise en oeuvre, est la traduction d’adresses rĂ©seau (NAT). NAT est un mĂ©canisme permettant de conserver les adresses IP enregistrĂ©es dans des rĂ©seaux de grande taille et de simplifier la gestion de l’adressage IP. Lorsqu’un paquet est routĂ© par un Ă©quipement de rĂ©seau, gĂ©nĂ©ralement un pare-feu
Beforewe understand NAT in details let’s get familiar with four basic terms used in NAT. Term. Description. Inside Local IP Address. Before translation source IP address located inside the local network. Inside Global IP Address. After translation source IP address located outside the local network. LQNUBwr.
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