I just found why my lookups take so long. My ISP has changed their DNS servers to a dynamic config so my servers are no longer valid and I don't know how to configure my asa5505 to do dhcp to automatically get the dns ip's.
You can configure DHCP on your ASA to use the DNS, WINS, and Domain name it obtains from the outside interface using DHCP or PPPOE by using the dhcpd auto_config command.
For example, your outside interface is setup for PPPOE. Use the following for your ASA to hand out dhcp addresses in the 192.168.1.0-192.168.1.100 and the DNS, WINS, and domain name that it receives from the ISP.
The problem is that it's not able to get dns servers at all. However, any firewall i put behind the ASA is able to get DNS servers so that when I browse from the 2nd firewall, it works fine. But if I browse from the ASA, it takes a while to resolve url's.
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...