In this case, you need to give the route command on the pix to tell it to route all the traffic through the outgoin interface, with the next hop ip address (which is the ip address of the Internet router facing the PIX).
This is what you have the command
route outside 0.0.0.0. 0.0.0.0 172.16.10.2
On the internet router, you dont have to give the ip route command, if your 10.0.0.0 network is translated to 172.16.0.0 network. coz, you will be translating to 172.16.0.0 network. If you have explicity allowed the 10.0.0.0 network , to pass through pix, then you need to give ip route command on the internet router.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...