I was on the phone with the FSC in TX for quite a while as they were working on my system Monday. They started with a truck roll for a new ONT, new router too while they were here. That didn't fix my 640 MTU issue (which I told them it wouldn't...duh), so the FSC decided to start really looking into the MTU issue from the CO onward.
Long story short, about 8 hours later (and quite a few calls), they spent an hour+ tracing my endless PING to the FSC to find out my PVC was wrong, so they rebuilt my PVC. That fixed the MTU issues and also increased the reliability (no screaming ONT so far). (Side note: the only way it got done was my ISP guy still had a friend in Verizon from the "old school" days when you could call someone direct to help, and he did.)
I never heard exactly where or on what device the MTU restriction was, but I have a funny feeling the path of the old PVC was for DSL rather than Fiber, so that may have been an issue. Don't know, but will ask later when I cal my ISP guy back.
As for DHCP, the FSC tech was telling me that it looks like a fer-sure thing, as it will be a better way for VZ to go than PPOE. The Firmware upgrade for the DI-604 (and wireless router) is available at:
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www2.verizon.net/micro/dlink/The VZ techs in TX are still working on a firmware/software patch for the ONT itself.
Interesting day, it was.