First you need to open a hole through the PIX. Create a static mapping for a global IP address to the inside TFTP server. Then use a conduit to allow TFTP (UDP port 69) traffic only from the routers IP address. Once that is complete you should be able to TFTP the routers config to the global IP address.
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...