I have been working with TCP/IP networking for 19 years and I have been with Cisco for 14 years where I am currently a Distiguished Support Engineer (DSE) in Customer Advocacy. My technical expertise is in the areas of TCP/IP, IPsec VPNs, Routing Protocols, NAT and HSRP. I am also the principle architect of the Dynamic Multipoint VPN (DMVPN) solution, where I work on DMVPN network designs, troubleshooting and the design of new DMVPN features. In all of these areas my focus is to understand how network and application protocols work at the packet level and then relate that to the design and functioning of the network as a whole.