I have a new customer that I installed an ASA 5505 to replace a Linksys VPN router. They have a main office with a static IP address, 3 branch offices with static IP addresses and 2 branches that are doing DHCP from the ISP for their router address. I have no problem getting the static VPNs up and running. My problem is with the VPN connections that are doing DHCP. I can go in and determine what IP they are currently using and setup a connection and it works fine. The problem is of course when their IP address from the ISP changes, which seems to happen at least daily. What is the proper way to setup a connection that is using DHCP? Also, can you setup multiple connections this way? Currently the 2 locations have different passwords setup in their routers.
I need help ASAP as this customer is getting frustrated quickly. I do not want to lose a customer that I just got over this.
Go to this link and scroll down to Site to Site VPN (L2L) with IOS and Site to Site VPN (L2L) with ASA, you can use the links example depicting your scenario requirements, where one end is dynamic and other static for Ipsec L2L IOS-to-ASA or ASA-to-IOS.
The best solution obiosly is having static IP addressing, make that clear with your client , but these exmaples are very good solution for your problem.
Keep in mind that the DHCP dynamic side will always be the initiator to bring up the tunnel , not the static side.
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...