Hi,

First of all, I would like to wish all an awesome Thanksgiving. Now to the problem. In the downstairs 1/2 bathroom of my 12-year old house, the toilet drain is cracked about two inches below the flange; I have a cast iron flange. The drain is in a slab and is not a straight drain. I wanted to use a non-wax solution like http://www.fluidmaster.com/connect_products_7500.html, but because the drain is not straight down, I will use a wax (or two) ring. How do I fix the crack in the drain? Because of its odd shape what solutions are available? Do I need to weld the crack together? Pics are attached. Thanks in advance for any advice.

If I just wanted to patch the pipe I would wire brush the crack and take JB Weld or a similar product and repair the crack. Force the compound into the crack, smooth it out so no rough spots are there and let it set up. I would then clean the old wax seal off and set the toilet using a single wax seal.
Now go and enjoy the day, Tom

I didn't expect such a quick response, especially during the holiday. Thank you so much for your answer. I will re-post on how things turn out. Thanks again!

Things did not turn out well. I applied JB Weld and when putting the toilet back on... snap... the flange pulled up, ripping the new weld. The "experts" at Home Depot and Lowe's tell me that I need a plumber to tunnel under my house, a solution costing between $5-10k. From the pics you can see the extent of cracks; all of which are within two inches of the flange. What recourse(s) do I have?

This is a "Hail Mary" repair. It will either work or you're out of gas. First secure the flange to the floor using Tap-Cons. After you get the flange to where you can't pull it up go back in and smooth out another repair with JB Weld. Let it cure and set up before you reset the toilet and, hey! Not so much muscle this time. Good luck, Tom