Does anyone have any real world experience of backing up a broadband connection with ISDN?
I propose to connect two sites via an ADSL service.
The VPN will be implemented on Cisco1720 with VPN software and hardware. The Telco will provide static IP's and ADSL to ethernet router. My router will therefore have dual ethernet. I would like to use ISDN to provide a backup to this link, and envisage one router dialing the other directly in the event of either site loosing its ADSL. The ISDN backup could be on another router if this makes it easier (HSRP).
Backup ISDN for serial links is easy since you loose the clock to the other site and can switch in the backup link. Later, the clock returns, the interface comes up and the backup is switched out.
With ADSL this is not possible, since the router just sees a permanent connection to the Telco's router.
I think maybe I need floating static routes, or OSPF hello's.
Along these same lines I need to do dial backup as well. My problem is I have a Primary VPN connection using ADSL and want to create a secondary VPN connection with a US Robotics modem hanging off my AUX port. When the tunnel goes down on the Primary, I need it to initiate dial backup on the AUX port, create a VPN tunnel and Terminate to the same VPN head end that the primary tunnel was terminated to.
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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...