1. This can have several reasons. But I guess that the image you are trying to install got damaged. Try downloading a new copy from the cisco website. If it is still not working, then try another tftp server.
2. To upgrade the PDM: download it from the cisco website (smartnet contract needed) and use the following command to install it:
"copy tftp flash:pdm"
I think the PDM for 6.3 is still in beta.
3 You can download al the images from the cisco website (smartnet contract needed). Downgrading should not be a problem if all the commands in the config are 6.1 compatible (= supported in 6.1). I am using the 6.31 at home and I seems pretty stable. But it is still an ED (early Deployment) version.
Not related to the problems posed in the original post, but: I'm running 6.3(1) and the beta version of PDM that's associated with it on the 535 platform and both software versions are sweet! 6.3(1) supports creation of logical interfaces (vlans) and the Home page for the PDM release has some nice monitoring features on it. I'm having some problems with failover, but not sure if it's code-related.
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...