OK folks, chiming in again with my more or less educated opinion.
DNS was built exactly to distribute fast and reliably small chunks of information (most or the time address related information to start with). Is an MX record now exactly an address related information, one would guess yes. Was DNS based blacklisting thought about when the BIND system was developed? I doubt it, still I believe most of you admins around use it in some form. The DNS system will survive much heavier load then we could possibly ever burden it with.
I believe a pull method is preferred over a push method, because it is easier to manage regionally. A system administrator could even decide to use a specific group of servers. I doubt that any sensible sysadmin will allow a push to be implemented anyway .... seee security risk.
To build smaller update chunks I beg you to reconsider the patch method, even though the files are binary. They could easily be converted to a textual multi line representation, then diffed with enough redundant information to assert the patch is inserted at the right place, possibly compressed for transport and applied to a text converted file, which of course would need to be converted back, checksummed, compared, you name it. All the necessary tools to do this are standard on *nix systems and there is always cygwin for the Redmond addicts.
cheers Erich
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