ridogi's questions

I have one mail server, one SonicWall firewall, two Internet providers, and an internal DNS server. I have WAN failover set up on the SonicWall so in the event that the primary connection is down users will get out on the secondary connection. The mail server is accessible from outside via either ISP.

mail.mydomain.com uses the primary Internet connection, and is the primary MX record.

mail2.mydomain.com uses the secondary Internet connection, and is the secondary MX record.

Webmail, mail clients and smartphones can use either address to connect when outside the LAN (only mail.mydomain.com works internally because of the internal DNS server), but when the primary ISP is down users need to know to use mail2.mydomain.com and smartphones don't connect as they are configured for mail.mydomain.com

I'd like to automatically detect when the primary Internet connection is down so mail.mydomain.com connects over either WAN connection.

I think BGP and DNS failover are my options, and I'm wondering if a load balancer is a possible solution and how that would fit into the setup. BGP is not an option with the internet providers I have. DNS failover with dyn.com or dnsmadeeasy.com is an option, but I'm concerned that the user's ISPs won't respect the short TTL and this won't be effective for short outages.

I have 10.8 Server with Filemaker Server 12 running two pages in Instant Web Publishing.

The pages are accessible locally:

http://192.168.168.42/fmi/iwp/cgi?-db=exampleONE&-loadframes
http://192.168.168.42/fmi/iwp/cgi?-db=exampleTWO&-loadframes

If I access the server at exampleONE.mydomain.com I can have the Web Services redirect index.html to http://exampleONE.mydomain.com/fmi/iwp/cgi?-db=exampleONE&-loadframes

If i access exampleTWO.mydomain.com it of course loads the same index.html file and redirects to the exampleONE page. I would like to have the server differentiate between exampleONE.mydomain.com/index.html and exampleTWO.mydomain.com/index.html

I am using the Redirects feature built into OS X Server GUI app. Is this possible in that, or with .htaccess?

My DNS provider does not allow redirects, but I can set A records and CNAMES.

I would like to host a CalDAV and CardDAV server for devices that will roam between being on the LAN to outside my network (such as my iPhone and laptops). A static IP is prohibitively expensive.

I have a my own domain, a Mac Mini with Lion Server, a SonicWall TZ 200 and a dyn.com dynamic address (the SonicWall keeps the dynamic account updated). I would normally set up a static IP and use split horizon DNS so those roaming devices can point to server.mydomain.com and function on and off my LAN.

Is a similar setup possible with the dynamic address? I am happy to set up the clients with either server.mydomain.com or myaccount.dyndns.org but I would prefer to use my domain.

Would either hairpin NAT on the SonicWall or split horizon DNS using the Lion Server allow this to work?