How to backup ADSL connection over Ethernet interface
Using a Cisco 877 router with ADSL connectivity, a backup connection is needed. A 3G (cellular) device is available, capable of setting up an IPsec VPN, and offering an ethernet port for connecting the (backup) port of the 877 router.
Neither the ADSL (on the 877 router) nor the cellular (on the 3G device) have fixed IP addresses assigned to them by the ADSL/3G service providers.
The main site has a fixed IP address, both on the connection with the internet as for a (dedicated) connection to the 3G provider.
The purpose is
- create an IPsec VPN on the ADSL interface (over the internet) to the main site
- route all traffic over the IPsec VPN on the ADSL interface
- route all traffic over the ethernet port to the 3G (cellular) device if the main site is not acceaccessible via the ADSL interface.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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