Config of Cisco 2611 acting as ''Gateway'' to remote network device

We currently have a Cisco 2611 router running IOS Version 12.2(27). The Cisco router acts as the "Gateway" to a rmeotely located linux network device. See the attached zip file for a white paper showing the set-up. There are two connections from the Cisco 2611 router acting as the "Gateway" to the remote linux network device: - The primary connection consists of a GRE over IPSec tunnel via an Ethernet Interface. - A Secondary backup Connection that is a GRE over IPSec tunnel via Async interface (utilizes PSTN capabilities). In the case that the primary connection fails, the secondary backup will automatically be dialed by the Linux Network Device to the Cisco Router or by the Cisco router to the Linux Network Device depending on the situation. The problem we are having is that the Cisco router is not recognizing the Primary connection (GRE Tunnel) as down, and therefore, when the Linux Network device dials the Cisco router, the route is not being switched. We need to be able to track the state of the GRE tunnels using the current Cisco IOS and without using GRE keepalives. Changes to the Linux Network Device are not possible. ***** See attached file for the current Cisco configuration file, and a document that describes the Secure Remote Appliance that the Cisco Router is being configured to support.** ## Deliverables A configuration file that can be loaded on the Cisco 2611 Router described above and achieve the desired routing capabilities between the Primary In-Band link and the Secondary Out-of-Band Link. 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform **Platform Information** Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-IK9S-M), Version 12.2(27), RELEASE SOFTWARE (fc3) cisco 2611 (MPC860) processor (revision 0x203) with 45056K/4096K bytes of memory Processor board ID JAD03500ADH (3846467952) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0. Basic Rate ISDN software, Version 1.1. 2 Ethernet/IEEE 802.3 interface(s) 1 Serial network interface(s) 1 ISDN Basic Rate interface(s) 32K bytes of non-volatile configuration memory. 16384K bytes of processor board System flash (Read/Write)