Typically, there should be no NAT performed on the VPN traffic. Figure7-1 Site-to-Site VPN Using an IPSec Tunnel and GRE, Branch office containing multiple LANs and VLANs, Fast Ethernet LAN interfaceWith address 192.168.0.0/16 (also the inside interface for NAT), VPN clientCisco 850 or Cisco 870 series access router, Fast Ethernet or ATM interfaceWith address 200.1.1.1 (also the outside interface for NAT), LAN interfaceConnects to the Internet; with outside interface address of 210.110.101.1, VPN clientAnother router, which controls access to the corporate network, LAN interfaceConnects to the corporate network, with inside interface address of 10.1.1.1. So, the summary of the requirements are: First, we will configure all the configurations on Router1. Ensure that an IKE exchange using RSA signatures has already occurred between the peers. The policy-map default class is the class to which traffic is directed if that traffic does not satisfy the match criteria of other classes whose policy is defined in the policy map. . Specifies the hash algorithm used in the IKE policy. You could also use a RADIUS server for this. For example, you can create access lists to protect all IP traffic between the headquarters router and business partner router. Perform these steps to configure the group policy, beginning in global configuration mode: crypto isakmp client configuration group {group-name | default}. Note Using the clear crypto sa command without parameters clears out the full SA database, which clears out active security sessions. WFQ can also manage duplex data streams such as those between pairs of applications, and simplex data streams such as voice or video. To configure pre-shared keys, perform these steps at each peer that uses pre-shared keys in an IKE policy: Step1 Set each peer ISAKMP identity. Cisco Easy VPN is a convenient method to allow remote users to connect to your network using IPsec VPN tunnels. Learn more about how Cisco is using Inclusive Language. Specify the inside interface. Note Throughout this chapter, there are numerous configuration examples and sample configuration outputs that include unusable IP addresses. Specifies the IP precedence of packets within a traffic class. username name {nopassword | password password | password encryption-type encrypted-password}. set transform-set transform-set-name [transform-set-name2transform-set-name6]. For details, see the Cisco IOS Security Configuration Guide and Cisco IOS Security Command Reference. Be sure to use your own IP addresses when configuring your Cisco 7200 series router. Cisco routers and other broadband devices provide high-performance connections to the Internet, but many applications also require the security of VPN connections which perform a high level of authentication and which encrypt the data between two particular endpoints. 3/ Perform initial router configuration. This is rarely configured in dynamic crypto map entries. As we have finished the configuration of the IPSec Tunnel between the Cisco ASA and Cisco Router. Note The following procedure is based on the "Site-to-Site Scenario" section. This section includes the following topics: Configuring Static Inside Source Address Translation, Verifying Static Inside Source Address Translation, Configuring Network-Based Application Recognition, Configuring Class-Based Weighted Fair Queuing, Verifying Class-Based Weighted Fair Queuing, Creating Extended Access Lists Using Access List Numbers, Verifying Extended Access Lists Are Applied Correctly. When you apply an access list that has not yet been defined to an interface, the software acts as if the access list has not been applied to the interface and will accept all packets. Now, we need to apply this crypto Map to the Outgoing Interface. Note The procedures in this chapter assume that you have already configured basic router features as well as PPPoE or PPPoA with NAT, DCHP and VLANs. In order to configure a preshared authentication key, enter the crypto isakmp key command in global configuration mode: Use the extended or named access list in order to specify the traffic that should be protected by encryption. For IKEv1, the remote peer policy must also specify a lifetime less than or equal to the lifetime in the policy that the initiator sends. Packets with the same source IP address, destination IP address, source Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) port, or destination TCP or UDP port belong to the same flow. The crypto map entries must each identify the other peer (unless the responding peer is using dynamic crypto maps). Mark as New; Bookmark; Subscribe; Mute; Subscribe to RSS Feed; Permalink; Print; Report Inappropriate Content 10-09-2017 08:46 AM - edited 03-12-2019 04:36 AM. Not necessarily a legitimate address, it was allocated from address space routable on the inside. Access lists can be applied on either outbound or inbound interfaces. Network redundancy (resiliency) is an important consideration in the decision to use GRE tunnels, IPSec tunnels, or tunnels which utilize IPSec over GRE. Care must be taken if the any keyword is used in the access list, because the access list is used for packet filtering as well as for negotiation. (Optional) Specifies how many times the router will continue to send unsuccessful certificate requests before giving up. For example, you might specify bandwidth for one class and both bandwidth and queue limit for another class. Specifies the IKE pre-shared key for the group policy. Additionally, each peer must be enrolled with a CA. Perform these steps to apply a crypto map to an interface, beginning in global configuration mode: Enters interface configuration mode for the interface to which you want to apply the crypto map. Basically, the router will request as many keys as the configuration will support. Specify the hash algorithmMessage Digest 5 (MD5 [md5]) or Secure Hash Algorithm (SHA [sha]). Note With manually established security associations, there is no negotiation with the peer, and both sides must specify the same transform set. (RSA signatures require that each peer has the remote peer's public signature key.) Beginner Options. Specifies the hash algorithm used in the IKE policy. All trademarks are the property of their respective owners. encryption {des | 3des | aes | aes 192 | aes 256}. Your interface to NBAR is through the modular QoS command-line interface (MQC). There are two categories of WFQ sessions: high bandwidth and low bandwidth. Exit back to global configuration mode and configure traffic from the remote office network through the tunnel. If the access list permits the address, the software continues to process the packet. The advantage of Easy VPN is that you don't have to worry about all the IPSEC security details on the client side. Use the no match-all and nomatch-any commands to disable these commands within the class map. This protocol allows most VPN parameters, such as internal IP addresses, internal subnet masks, DHCP server addresses, WINS server addresses, and split-tunneling flags, to be defined at a VPN server, such as a Cisco VPN 3000 series concentrator that is acting as an IPSec server. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets . At the remote peer: Specify the shared key to be used with the local peer. Specifies the name of the output interface used as a match criterion against which packets are checked to determine if they belong to the class. Then, future IKE negotiations will be able to use RSA-encrypted nonces because the public keys will have been exchanged. The bandwidth assigned to a class is the minimum bandwidth delivered to the class during congestion. Unfortunately, by passing the IP header in the clear, transport mode allows an attacker to perform some traffic analysis. This header, when added to an IP datagram, protects the confidentiality, integrity, and authenticity of the data. Here, I access the CLI of the Cisco ASA Firewall and initiate some traffic towards the Cisco Router LAN Subnet, i.e. This example combines AH1 transform ah-sha-hmac, ESP2 encryption transform esp-des, and ESP authentication transform esp-sha-hmac in the transform set proposal4. (Optional) Shows that the private key is protected and locked. IKE does not have to be enabled for individual interfaces, but is enabled globally for all interfaces in the router. Tip If you have trouble, use the show version command to ensure your Cisco 7200 series router is running a CiscoIOS software image that supports crypto. In this scenario, you only need to complete this task at the business partner router. NAT is also described in RFC 1631. This example specifies Fast Ethernet interface0/1 on the headquarters router. Note The CiscoSecure PIXFirewall can be used as an alternative to Cisco IOS firewall features. For ISAKMP Phase1, we will use the following parameters: Now, we need to define a pre-shared key. Employees in the remote office are able to access internal, private web pages and perform various IP-based network tasks. Enter your email address to subscribe to this blog and receive notifications of new posts by email. "PFS N" indicates that IPSec will not negotiate perfect forward secrecy when establishing new SAs for this crypto map. Figure3-4 shows the physical elements of the scenario. To create a class map containing match criteria against which a packet is checked to determine if it belongs to a class, and to effectively create the class whose policy can be specified in one or more policy maps, use the first command in global configuration mode to specify the class-map name. This example uses a local authentication database. Enter the show interfaces tunnel0 EXEC command to view the tunnel interface status, configured IP addresses, and encapsulation type. authorization list rtr-remote, crypto map dynmap client
Log into the router's setup pages. Packets that arrive at the output interface are classified according to the match criteria filters you define, then each one is assigned the appropriate weight. You could also use a RADIUS server for this. In order to specify an extended access list for a crypto map entry, enter the. List multiple transform sets in order of priority (highest priority first). Use the noclass-map command to disable the class map. This example configures SHA, which is the default. Router# show crypto key mypubkey rsa. The Cisco Easy VPN client feature can be configured in one of two modesclient mode or network extension mode. For both of these protocols, IPSec does not define the specific security algorithms to use, but rather, provides an open framework for implementing industry-standard algorithms. To define a transform set and configure IPSec . ) sa 0 5 0 . NAT also allows a more graceful renumbering strategy for organizations that are changing service providers or voluntarily renumbering into classless interdomain routing (CIDR) blocks. Specifies global lifetime values used when IPSec security associations are negotiated. You must verify the connectivity between R1 and R2. 1 AH = authentication header. Cisco IOS firewall features are designed to prevent unauthorized, external individuals from gaining access to your internal network, and to block attacks on your network, while at the same time allowing authorized users to access network resources. Specifies the maximum number of packets that can be enqueued for the specified default class. Enter the show access-lists 111 EXEC command to see the access list attributes. Also enters Internet Security Association and Key Management Protocol (ISAKMP) policy configuration mode. Traffic like data, voice, video, etc. Again, this example specifies the address keyword, which uses IP address 172.24.2.5 (serial interface 1/0 of the remote office router) as the identity for the remote office router. Comment * document.getElementById("comment").setAttribute( "id", "a00898de2d4aa9fe3f17648e2dfc9c79" );document.getElementById("d8ef399e04").setAttribute( "id", "comment" ); Notify me of follow-up comments by email. Refer to the Integrated Service Adapter and Integrated Service Module Installation and Configuration publication for detailed configuration information on the ISM. Packets satisfying the match criteria for a class constitute the traffic for that class. Cisco recommends using 3DES. Note IPSec tunnel mode configuration instructions are described in detail in the "Configuring IPSec and IPSec Tunnel Mode" section. Figure3-1 Site-to-Site VPN Business Scenario. This is the peer to which IPSec protected traffic can be forwarded. Note The examples shown in this chapter refer only to the endpoint configuration on the Cisco870 series router. All of the devices used in this document started with a cleared (default) configuration. (Optional) Specifies a remote IPSec peer. In order to configure the Internet Security Association and Key Management Protocol (ISAKMP) policies for the IKEv1 connections, enter the crypto ikev1 policy
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