I have been trying to setup a redundant connection between sites at a client with two locations. Site 1 is using cable and DSL while Site 2 is using cable and an EVDO router (DSL not available, T1 is unreliable at this site). This client has been plagued by lousy connections for the last several years over fractional T1 lines that frequently drop. The current project is to setup a site-to-site VPN that will automatically switch to the live connection on either side in case of an outage. There are also 30 plus notebooks and handheld devices that need SSH, FTP and web interface access to servers at the main site. I have been waiting for 7.4 as it seemed this would be the answer to several setup issues.
I have site 1 setup with uplink balancing. I have a domain name tied to the two public IPs at site 1 (both static) through our DNS hosting service. SSH and web interface access both seem to work, but FTP will not work using the domain name. I only have the cable connection setup so far at site 2. Site 1 has a single VPN connection setup using the uplink interfaces option. Site 2 has two VPN connections, one to the each of the two IPs at site 1. So far, only one of these VPN's connects at a time and they need to be manually switched over if an interface in the uplink setup goes down at site 1 to reestablish connectivity. I am not sure what I need to do at this point to setup site 2 with uplink balancing and a single VPN that will automatically fail over.
I have also considered using SFTP in place of FTP at site 1 but this will require a significant amount of time and hands-on setup of each notebook and handheld device. This is a setup that has grown in pieces over the last 10 or 15 years and has been a real challenge to change. Any ideas or thoughts would be welcome. I can provide additional details as needed.
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