I am having the same issue. It seems only the routers running 12.3, 12.4 support helper address for ipv6. Even the 6500 does not have suppoprt for this. Can Cisco comment on when ip helper for ipv6 will be added to the other platforms.
I have a Cisco 2651XM router and run 12.3 code. The IPv6 DHCPv3 forwarder is now called "RELAY AGENT".
I also noticed the 3750 series switches do not support the relay agent feature so anyone trying to consolidate devices - well hold on. The switch provides connectivity but you will still need a router that supports "RELAY AGENT" to forward DHCPv3 request if requestor is not on the same local lan as the provider (I.E. DHCPv3 server)
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...