AT&T U-verse Pace Plc 5268AC bridge mode (with caveat)

Steps to enable bridge mode on Pace Plc 5268AC (tested with software version 10.6.0.530094-att). Bridge mode is needed to use your own router (but it still needs to be plugged into the 5268AC). Here is the caveat: ipsec (site-to-site VPN) will not work. AT&T blocks it, so you have to upgrade to business class service to get it unblocked. This instruction is aimed for regular U-verse service w/o static IP/block. If you have a static block, you should use the Cascaded Router feature.
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