Seen this with Checpoint secure remote VPN cleint and 3Com wireless card.
It is due to the fact that (as long as you use DHCP from the wireless gateway) the VPN client bloock the allocation of a DHCP adrdess to the card. I fould that using a diff brand of card got rid of the problem. I found that the Cisco Aironet 350 card worked fine in all setups. By the way I do not work for Cisco, so my recommendation of that card is based on me struggling to get it working with the 3Com card. It could be that the DLink suffers with the same issue. Being WiFi the Cisco card should work with your DLink gateway. The cisco 350 worled with my 3com wirless gateway perfectly.
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...
[toc:faq]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 and UDP are I...