I am having problems configuring a site to site vpn on my Cisco 8xx series router. I have established the vpn using the config provided but can't talk to any computers at the other end.

Cisco 1900 router series including CISCO1941/K9, C1941-SEC-SRE/K9, CISCO1941-SEC/K9, CISCO1941W-A/K9, CISCO1941W-E/K9, etc. are designed for small office and small enterprise branch offices, delivering high-performance, highly secure connectivity with multiservice integration that can transform the workplace with a broad set of services, rich-media support, and operational excellence.

Key features of Cisco 1900 series in detials:High Perfomance: Cisco 1900 series routers offer significant performance improvements over previous-generation ISRs such as 1800 series.

Investment Protection: Cisco router 1900 Series reduces deployment costs and increases flexibility. The platform also offers investment protection with support for a majority of existing WICs and HWICs.
Services On-Demand: The Cisco 1900 Series Integrated Services Routers reduce total cost of ownership by decoupling the delivery of software from hardware on optional service modules. In addition, you receive a Universal IOS image capable of enabling all of Cisco's rich IOS features and allowing you to quickly deploy new services.

Energy Efficiency: The Cisco 1900 Series architecture incorporates higher-efficiency power supplies with intelligent power management.
Specifiction of Cisco Router 1900 series:* Embedded hardware-accelerated VPN encryption.* Secure collaborative communications with Group Encrypted Transport VPN, Dynamic Multipoint VPN, or Enhanced Easy VPN.* Integrated threat control using Cisco IOS Firewall, Cisco IOS Zone-Based Firewall, Cisco IOS IPS, and Cisco IOS Content Filtering.* Identity management that uses authentication, authorization, and accounting (AAA), and public key infrastructure.* 2 Integrated 10/100/1000 Ethernet ports.* 2 enhanced High-Speed WAN Interface Card slots that can host 2 single wide or 1 double wide and 1 single wide (e)HWIC.* Fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE.

Overall, Cisco 1900 Series Routers offer unparalleled total cost of ownership savings and network agility through the intelligent integration of security, wireless, and application services.

After knowing more information about Cisco router 1900 series, it's nice choice for you to select one of Cisco 1900 series that meet yor need in net to net.Why not choose? More tips about Cisco products and other Cisco network equipments you can visit here: http://www.router-switch.com/Price-cisco-routers-cisco-router-1900-series_c16