![]() The routers ISP_IR1 and ISP_IR2 have global IPv6 address and does not have knowledge about private subnets present on CE1 and CE2. In following example IPSec-protected tunnel is set up between CE1 and CE2 to communicate over public network. With IPsec, data can be sent across a public network without observation, modification, or spoofing.ġ) Site-to-site VPN – protect all IPv6 traffic between two trusted networksĢ) Configured Secure Tunnel – protect IPv6 traffic being tunneled over an non trusted IPv4 network.ģ) IPSec can also be used to protect control plane functions, such as IPSec to protect OSPFv3. IPsec provides data authentication and anti-replay services in addition to data confidentiality services. This document discuss about IPv6 IPsec Site-to-Site VPN Using Virtual Tunnel Interface with configuration example.Ĭisco IOS IPsec functionality provides network data encryption at the IP packet level, offering a robust, standards-based security solution. Step 3: Configure an ISAKMP Profile in IPv6:.Step 2: Configuring an IPsec Transform Set and IPsec Profile:.Step 1: Configure IKE Policy and Pre-shared Key:.GRE tunnel uses a ‘tunnel’ interface – a logical interface configured on the router with an IP address where packets are encapsulated and decapsulated as they enter or exit the GRE tunnel. We explain all the necessary steps to create and verify the GRE tunnel (unprotected and protected) and configure routing between the two networks. These steps are: (1) Configure ISAKMP (ISAKMP Phase 1) (2) Configure IPSec (ISAKMP Phase 2, ACLs, Crypto MAP) Our example setup is between two branches of a small company, these are Site 1 and Site 2. This article will explain how to create simple (unprotected) and secure (IPSec encrypted) GRE tunnels between endpoints. To help make this an easy-to-follow exercise, we have split it into two steps that are required to get the Site-to-Site IPSec VPN Tunnel to work. For this reason, plus the fact that GRE tunnels are much easier to configure, engineers prefer to use GRE rather than IPSec VPN. ![]() ![]() In large networks where routing protocols such as OSPF, EIGRP are necessary, GRE tunnels are your best bet. A major difference is that GRE tunnels allow multicast packets to traverse the tunnel whereas IPSec VPN does not support multicast packets. While many might think a GRE IPSec tunnel between two routers is similar to a site to site IPSec VPN (crypto), it is not. The diagram below shows the encapsulation procedure of a simple - unprotected GRE packet as it traversers the router and enters the tunnel interface: Here is the IPSecuritas configuration General Remote IPSec Device: Local Side - Endpoint Mode: Host Local Side - IP Address: Leave this blank Remote Side - Endpoint Mode: Network Remote Side - Network Address: 192.168.2. ![]() If data protection is required, IPSec must be configured to provide data confidentiality – this is when a GRE tunnel is transformed into a secure VPN GRE tunnel. The RV042 configuration is in my original post. It is important to note that packets travelling inside a GRE tunnel are not encrypted as GRE does not encrypt the tunnel but encapsulates it with a GRE header. With GRE, a virtual tunnel is created between the two endpoints (Cisco routers) and packets are sent through the GRE tunnel. Generic Routing Encapsulation ( GRE) is a tunneling protocol developed by Cisco that allows the encapsulation of a wide variety of network layer protocols inside point-to-point links.Ī GRE tunnel is used when packets need to be sent from one network to another over the Internet or an insecure network. ![]()
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