Which would be a better termination point for an IPSEC (site to site) VPN for an extranet (Internet) connection to a business partner? I have a 7206VXR Internet screening router (I can get a VAM and proper 3DES IOS) or a PIX525 firewall (I can get a VAC and I already have a 3DES lic.) just inside the 7206?
An integrated network design is one in which the WAN, VPN, and IOS firewall functions are run on the same device, for example, on a remote site gateway. Integrated network designs are common in remote offices because of their simplicity and manageability.
An overlay design is one in which any single function, or all functions, are separated, as in headend designs. Firewall functionality is usually separate, the WAN and VPN functions are often integrated (meaning that the functions run on the same device), and VPN functionality is frequently separate from the WAN and firewall functions.
The primary advantage of an overlay design in the headend configuration is that the separation of tasks optimizes network performance. Each device may be dedicated to one or two tasks, rather than all three, in a heavy traffic environment. For example, ACLs (Access Control Lists) require a fair amount of CPU utilization. Therefore, performing ACL tasks on a device other than the gateway allows the gateway more power to support network traffic.
Basically everything boils down to your network traffic and the load placed on the router and pix.
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...