We have a typical scenario, 2610 router connected to internet, the ethernet of 2610 directly connected to pix 515 through cross cable. on one dmz of pix 515 we have a concentrator, on the external interface of concentrator there is one SMTP gateway, the problem is this smtp gateway has to send mails and receive mails from internet, due to some client requirement it has to be behind the Concentrator, as this SMTP gateway is also used to send mails through VPN's to couple of clients.
Can you please suggest me how to do configuration for this kind of scenario.
Thanks a lot for giving me the configuration. i have done accordingly, but the problem which i am facing now is that i am able to ping to vpn concentrator from my smtp server on the external interface of concentrator, i am also able to ping to the dmz interface of the firewall. but i am not able to ping or browse or send mails to internet as well as not able to ping ethernet interface of the router. do i need to add some thing else to do this.
let me remind again that the dmz interface of firewall is connected to outside interface of concentrator and smtp server is connected to external interface of vpn concentrator, is it because of this that the packets are getting dropped. i am not sure how a concentrator will behave in this scenario.
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...