Because supported tunnels are point-to-point links, you must configure a The following example configures a GRE CTunnel running both IS-IS and IPv6 traffic between RouterA and RouterB in a CLNS network. Perform this task to configure a GRE tunnel. On Cisco IOS routers however we can use IPSEC to encrypt the entire GRE.Configure the 192.168.13. For more details on GTS, see the "Regulating Packet Flow Using Traffic Shaping" chapter of the Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.4. For more details about UDLR tunneling, see Cisco IOS IP Multicast Configuration Guide, Release 12.4. This document is intended as an introduction to certain aspects of IKE and IPsec, it WILL contain certain simplifications and colloquialisms. GRE keepalive packets may be sent from both sides of a tunnel or from just one side. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Note: The IP addressing schemes used in this configuration are not legally routable on the Internet. Note The receive keyword is no longer used. hZ+pU- ,d"2@J|LwL`-ra7dz:vaf0I\FaB^~"*jQ`?G?Cs/7Z$Q9y]sHki(?Xm4#?v,pI.$ABfQ|Va0O=XPy.\Kj%@_rl Y?xeuzeXq,')/4{N]pYA5#U9D We will do the same configuration on Router 2, only IP addresses will change. The tunnel endpoints, tunnel source, and tunnel destination must be defined, and the type of tunnel must be selected. Reference: Generic Routing Encapsulation (GRE) Routing Protocols configuration gre_tunnel k20720223 1 2 3 Configuring a CTunnel allows you to telnet to a remote router that has only CLNS connectivity. The implementation of this feature does not include support for GRE services defined in header fields, such as those used to specify checksums, keys, or sequencing. Specifies the destination IPv6 address for the tunnel interface. Subinterfaces can be physical or virtual, Interface and Hardware Component Configuration Guide for Cisco CRS Routers, IOS XR Release 6.7.x, View with Adobe Reader on a variety of devices. Satellite links have several characteristics that affect the performance of IP protocols over the link. The tunnels are not tied to a specific passenger or transport protocol, but in this case IPv6 is the passenger protocol, GRE is the carrier protocol, and IPv4 is the transport protocol. When a device on the Internet, called a correspondent node (CN), sends a packet to the MN, the packet is routed to the home network of the MN, the HA redirects the packet by tunneling to the care-of address (current location) of the MN on the foreign network, as shown in Figure4. A round-trip time (RTT) of 550 milliseconds is a very long delay for TCP. The ISATAP router provides standard router advertisement network configuration support for the ISATAP site. Reporting dropped packets to SCTP provides better bandwidth use because RBSCP tells the SCTP implementation at the end hosts to retransmit the dropped packets and this prevents the end hosts from assuming that the network is congested. RBSCP has some performance limitations because traffic through the tunnel is process-switched. Tunneling provides a way to encapsulate arbitrary packets inside a transport protocol. On your router, configure network address translation from the Incapsula Protected IP to your current server IP. For additional information, refer to these documents: GRE over IPSEC Cisco CRS The host or router at each end of a configured tunnel must support both the IPv4 and IPv6 protocol stacks. Step 4. RP secure transport. As the packet ascends the protocol stack on the receiving side of the network, each encapsulation header is removed in the reverse order. Router(config-if)# ip vrf forwarding green, Router(config-if)# ip address 10.7.7.7 255.255.255.255. Configure the tunnel destinationtunnel destination {ip-address | Perform this task to configure an IP over CLNS tunnel (CTunnel). The following section provides information about this feature: The following command was introduced by this feature: keepalive (tunnel interfaces). Examples of this numerical ID are Loopback 0, If your network is live, ensure that you understand the potential impact of any command. CLNS can also be used as a transport protocol with GRE as a carrier protocol (GRE/CLNS), carrying both IPv4 and IPv6 packets. When you have recursive routing to the tunnel destination, the following error appears: To configure tunnels, you should understand the following concepts: Definition of Tunneling Types by OSI Layer, GRE Tunnel IP Source and Destination VRF Membership, GRE/CLNS Tunnel Support for IPv4 and IPv6 Packets, GRE/IPv4 Tunnel Support for IPv6 Traffic, Rate-Based Satellite Control Protocol Tunnels. All counters display totals accumulated since the last clear rbscp command was issued. All rights reserved. Displays forwarding information for the PPTP supports on-demand, multiprotocol, virtual private networking over public networks such as the Internet. To understand how tunnels work, it is important to distinguish between the concepts of encapsulation and tunneling. and, in the event of a We do not now recommend using this tunnel type. The default bandwidth setting on a tunnel interface is 9.6 kbps. your AAA administrator for assistance. Associations. Use the mpls keyword to specify that MPLS will be used for configuring Traffic Engineering (TE) tunnels. To locate and download MIBs for selected platforms, CiscoIOS releases, and feature sets, use CiscoMIB Locator found at the following URL: Multiprotocol Encapsulation over ATM Adaptation Layer 5, Generic Packet Tunneling in IPv6 Specification, Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers, A Method for Transmitting PPP over Ethernet (PPPoE), IANA Allocation Guidelines for Values in the Internet Protocol and Related Headers, Key and Sequence Number Extensions to GRE, Transition Mechanisms for IPv6 Hosts and Routers, Connection of IPv6 Domains via IPv4 Clouds, Generic Routing Encapsulation over CLNS Networks. A tunnel is as robust and fast, or as unreliable and slow, as the links that it actually traverses. . The Cisco 10000 series router does not support the fragmentation of multicast packets passing through a multicast tunnel. With an IPv4-compatible tunnel, the tunnel destination is automatically determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses. 2022 Cisco and/or its affiliates. Table3 Overlay Tunnel Configuration Parameters by Tunneling Type. This configuration example is a basic VPN setup between a FortiGate unit and a Cisco router, using a Virtual Tunnel Interface (VTI) on the Cisco router. like bandwidth shaping and QoS have a global scope and do not have an associated location. When configuring the IPSec transform set, no other configuration commands are required to enable tunnel mode: R1 (config)# crypto ipsec transform-set TS esp-3des esp-md5-hmac Calculating GRE IPSec Tunnel Mode Overhead The following example shows a simple configuration of GRE tunneling. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Step1: ASA Access. The tunnel destination is automatically determined by the IPv4 address in the low-order 32 bits of IPv4-compatible IPv6 addresses. Prerequisites Requirements There are no specific requirements for this document. Encapsulation is the process of adding headers to data at each layer of a particular protocol stack. applied to the tunnel for IPSec processing. Configuring GRE over IPSec Between a Cisco IOS Router and a VPN 5000 Concentrator Using Static Routing, Configuring the Cisco VPN 5000 and a Router to Open a GRE Tunnel, WCCP on ASA: Concepts, Limitations, and Configuration, Configuring CiscoSecure ACS for Windows Router PPTP Authentication, Configuring the PIX Firewall and VPN Clients Using PPTP, MPPE and IPSec, Configuring the VPN 3000 Concentrator PPTP With Cisco Secure ACS for Windows RADIUS Authentication, How to Configure the VPN 3000 Concentrator PPTP with Local Authentication, PIX 6.x: PPTP with Radius Authentication Configuration Example, Configuring Dynamic Multipoint VPN Using GRE Over IPSec With EIGRP, NAT, and CBAC, Configuring Dynamic Multipoint VPN Using GRE Over IPsec With OSPF, NAT, and Cisco IOS Firewall, Configuring GRE and IPSec with IPX Routing, Configuring IPSec with EIGRP and IPX Using GRE Tunneling, Configuring Router-to-Router IPsec (Pre-shared Keys) on GRE Tunnel with IOS Firewall and NAT, Configuring a GRE Tunnel over IPsec with OSPF, Enable LAT Over a GRE Tunnel with Protocol Translation Configuration Example, IPSec/GRE with NAT on IOS Router Configuration Example, Next Generation Multicast Default MDT: Profile 0, Client-Initiated L2TPv2 Tunnel with ISR4000 That Acts as a Server Configuration Example, Configuring Cisco IOS and Windows 2000 Clients for L2TP Using Microsoft IAS, Configuring Layer 2 Tunnel Protocol Authentication with RADIUS, Configuring a PC as a PPPoA Client Using L3 SSG/SSD, Configuring the PPPoE Client on a Cisco Secure PIX Firewall, How to Configure Layer 2 Tunnel Protocol Authentication with TACACS+, L2 Bridging Across an L3 Network Configuration Example, Set Up L2TP Tunnel Between a Windows Machine and a Cisco Router, Configuring PPTP Through PAT to a Microsoft PPTP Server, Configuring the Cisco Router and VPN Clients Using PPTP and MPPE, Configuring BSTUN Point-to-Point with Local Acknowledgement over Frame Relay, Configuring STUN with Mixed Encapsulation, Configuring STUN with Modem-Sharing Devices, STUN Direct Encapsulation Configuration Example, Serial Tunneling (STUN) Complex Multipoint, Tunneling Async Protocols in BSTUN Configuration Example, Configuring a Router as a PAD for XOT to an Asynchronous Host, All Support Documentation for this Series. Generic routing encapsulation (GRE) is defined in RFC 2784. RFC 2474 and RFC 2780 obsolete the use of the ToS byte as defined in RFC 791. Cisco IOS XR Software Below the table, each carrier protocol is defined, and if the tunnel configuration is not covered within this module, a link to the appropriate module is included. The PEP generates a local TCP ACK (TCP spoofing) for all data. Hub and Spoke routers are using mGRE tunnels; Hub router(s) act as route-reflector server(s) Spoke routers are route-reflector clients; Hub router can send summary route to Spoke routers; eBGP can also be used by configuring Hub and >Spokes</b> in different ASNs. QoS options for tunnels include support for applying generic traffic shaping (GTS) directly on the tunnel interface and support for class-based shaping using the modular QoS command-line interface (MQC). Sets the current bandwidth value for an interface and communicates it to higher-level protocols. interface-id}. GRE tunnel keepalive is not supported in cases where virtual route forwarding (VRF) is applied to a GRE tunnel. Configurable MTU is not supported on Single-pass GRE interface, but supported on 2-pass GRE interface. The default CTunnel mode continues to use the standard Cisco encapsulation, which will tunnel only IPv4 packets. We do not recommend relying on this key for security purposes. Using an IPv4-compatible IPv6 address for the BGP neighbor allows the IPv6 BGP session to be automatically transported over an IPv4-compatible tunnel. Figure12 illustrates the creation of a CTunnel between Router A and Router B, as accomplished in the configuration examples that follow. The normal case for GRE tunnels is to have a static remote end ip address for each tunnel. If you want to implement security features for your IPv6 network, see the "Implementing Security for IPv6" module. The primary use of GRE tunnels is for stable connections that require regular secure communication between two edge routers or between an edge router and an end system. To configure an RBSCP tunnel to carry IP data packets over a satellite or other long-distance delay link with high error rates, proceed to the "Configuring the RBSCP Tunnel" section. The relatively high bandwidth consumed by the broadcasting of Routing Table Maintenance Protocol (RTMP) data packets can severely hamper the backbone's network performance. Configuring the IPSec Tunnel on Cisco Router 2 Now, we already described all the parameters used in the IPSec tunnel. Tunnel interfaces also support class-based policing, but they do not support committed access rate (CAR). Multiprotocol Label Switching (MPLS) is a high-performance packet forwarding technology that integrates the performance and traffic management capabilities of data-link-layer (Layer 2) switching with the scalability, flexibility, and performance of network-layer (Layer 3) routing. This message indicates that fragmentation was required (but not permitted) and provides the MTU of the link that caused the packet to be dropped. In 12.2(31)SB5, support was added for the Cisco 10000 series router for the PRE2 and PRE3. The following sample configuration applies generic traffic shaping (GTS) directly on the tunnel interface. tunnel. <>stream IP traffic is sent across the satellite link with appropriate modifications and enhancements that are determined by the router configuration. The following example shows what an actual ISATAP address would look like if the prefix is 2001:0DB8:1234:5678::/64 and the embedded IPv4 address is 10.173.129.8. The default tunneling mode is GRE. Figure10 Connecting AppleTalk Networks Across an IP-Only Backbone. Hub-and-spoke topology In a hub and spoke network configuration, the main office has configuration for a tunnel to each remote office, and each remote office has a single tunnel connecting detailed information about user groups and task IDs, see the New transport protocols such as SCTP require special handling or additional code to function with disruptive TCP PEP. Other Layer 3 tunneling protocols may not be supported for use with IPSec. Cisco 1800 Series Integrated Services Routers, Technical Support & Documentation - Cisco Systems, Name of the crypto map and sequence number, Name of the ACL applied along with the local and remote proxy identities, Interface on which the crypto map is binded. An IPv6 address is manually configured on a tunnel interface, and manually configured IPv4 addresses are assigned to the tunnel source and the tunnel destination. The tunnel source command used in the configuration of an ISATAP tunnel must point to an interface that is configured with an IPv4 address. configuration file, exits the configuration session, and returns the router to To control the type of traffic that uses the RBSCP tunnel, you must configure the appropriate routing. The tunnel interface is not tied to specific "passenger" or "transport" protocols, but, rather, it is an architecture that is designed to provide the services necessary to implement any standard point-to-point encapsulation scheme. In the following example, Router 1 and Router 2 are configured to send traffic through an RBSCP tunnel over a satellite link. Instead, you need to apply a hierarchical policy. Table1 shows the different carrier protocols grouped by OSI layer. 2. configure {terminal | memory | network}, 6. tunnel source (ip-address | type number), 7. tunnel destination ip-address {hostname | ip-address}. Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure (a core network or the Internet). Virtual interfaces have their control plane In order to configure the IKEv1 preshared key, enter the tunnel-group ipsec-attributes configuration mode: tunnel-group 172.17.1.1 type ipsec-l2l tunnel-group 172.17.1.1 ipsec-attributes ikev1 pre-shared-key cisco123 displays what was advertised and shows the routes for static and autoroute. Cisco CRS Router(config-if)# ctunnel destination 49.0001.2222.2222.2222.00. Fast Ethernet interface 0/1 is the tunnel source for Router B and the tunnel destination for Router A. For two crypto profile entries to be compatible, they must at least meet Cisco IOS software supports IPv4 and IPv6 as passenger protocols with GRE/IPv6. Enables higher privilege levels, such as privileged EXEC mode. Uses the ::/96 prefix. They can be written as 0:0:0:0:0:0:A.B.C.D or ::A.B.C.D, where "A.B.C.D" represents the embedded IPv4 address. QoS provides a way to ensure that mission-critical traffic has an acceptable level of performance. tunnel-ipsec, tunnel Ensure that the physical interface to be used as the tunnel source in this task is already configured. PMTUD currently works only on GRE and IP-in-IP tunnel interfaces.

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