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Note that detailed firewall design and VPN design are dependent on each network's unique requirements. The examples shown here are simpified to focus on the mechanics of using a primary and backup connection. Also note that in these examples, the NetVanta is the remote site router. Since this link is entirely over a provider's Frame Relay network, no firewall or VPN is required to protect the customer's network. The NetVanta uses its stateful inspection firewall to protect the remote network while connected to the ISP.

When the Frame Relay connection is re-established, the dial backup connection is dropped and the IPSec connection ages out. The dial connection to the Internet is used solely as a backup link, and general Internet access is not provided. This connection is always on and is used for local Internet access if the corporate security policy allows such connectivity while providing an alternate path to the central site.

This link is protected by the NetVanta firewall. Internet sessions are limited to egress! Ip route 0. Internet traffic ip route Both are protected by the NetVanta firewall. This PPPoE connection is always on and is used for local Internet access if the corporate security policy allows such connectivity as well as being used as the primary path to the central site. If the remote router accesses the central VPN gateway on the same IP address no matter which remote router interface is active, it is important that both devices support IKE dead peer detection.

Dead peer detection expedites this process, allowing the alternate VPN connection to be established more quickly. Since the Internet traffic is using 'nat source' to the active interface IP address,! NAT is used.

The problems with a standard VPN tunnel are that 1 all traffic that needs to traverse it must be specified in the configuration, 2 discontinuous subnets require separate tunnels, 3 it does not count as a routable interface, and 4 routing protocols cannot operate across it. This kind of tunnel 1 by default has no limitations on the traffic that traverses it, 2 can route multiple subnets without multiple tunnels, 3 counts as a routable interface, and 4 can have routing protocols operate across it.

However, the problem with GRE tunnels is that they are not secure. This guide will not go into the overall configuration steps of a VPN tunnel since they are covered extensively in KB article This guide will instead center on the selector statement, which is the only difference from a traditional VPN. The selectors would have to reflect this GRE tunnel traffic.

Configure the access-list that references the VPN in question. To configure a GRE tunnel: 1 Create the tunnel interface. This IP address makes no difference to the subnet s behind the router, as they will usually be entirely unaware of its existence. These IP addresses should be determined by the network administrator, preferably in an organized and logical manner. This requires that the MTU of the GRE tunnel be small enough to account for the additional overhead so that the final packet that is created is not fragmented.

In the command line, the GRE tunnel can be configured in the following manner: interface tunnel 1 ip address Configure the tunnel to the specifications required and as outlined in the above section. A uniquely-named policy-class Security Zone is recommended so that the firewall is able to distinguish the difference between interfaces in the same manner that the routing engine can, and it also makes it easier for the firewall administrator to understand in most cases.

The firewall construction, as outlined in this document, will take advantage of a firewall function to specify the destination policy-class. This is designed to ease the administrative burden when traffic does not need to be filtered on the edge routers, only routed to another site where policing can be centrally enforced. For further firewall configuration and understanding, refer to KB articles and In the CLI, the firewall can be configured in the following manner: ip firewall!

Assign the Security Zones to the appropriate interfaces.

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Just to clarify on doing the "flip-flop" of the isakmp policy settings, ie: isakmp policy 10 group 1 isakmp policy 20 group 2 Note that "policy 10" isn't directly tied to your HQ VPN connection. The '10' in "policy 10" is just a priority number - the PIX simply tries to use the settings in policy 10 first lower means higher priority , before trying policy 20 when doing an IKE negotiation. The tunnel promptly fell over, and I have not been able to re-establish it.

Doing a "sh cry isa sa" on my end I can see that the router on the US end is trying to re-establish the tunnel, but something isn't quite right because it never establishes. I had a guy in Sweden get into the router and send the running config to me in an e-mail, and darned if it doesn't look okay, nothing of importance has changed!

The Pix has been power-cycled AND "reload"ed, and yet nothing works properly any more. Gigabit Access for Business Services Service Providers around the world are delivering higher bandwidth services to their customers everyday with the explosion of bandwidth hungry mobile devices as well as cloud based applications. These applications are increasingly becoming line of business, or business critical, increasing the importance of reliable and fast cloud connectivity.

Redundancy The NetVanta provides multiple levels of redundancy for carrier access services. Intelligent failover can be provided via applications with redundant Ethernet links failing over to the active link anytime a link down event occurs. In the event that a single EFM loop fails, the NetVanta will continue to operate on the remaining loop, providing additional resiliency.

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