----- Original Message -----
From: "Alex Satrapa" <alex@lintelsys.com.au>
> As long as you don't use RFC1918 addresses, the IPv4 address(es) of the
> host should be unique for the Internet. Append/prepend a 32 bit
> timestamp and you have a 64bit unique identifier that is "universally"
> unique (to one second).
Aarrgh... So if you have 2 inserts in the same second, you have key
collision? Why not append a sequence to that so you have: Unique address
|| timestamp || sequence value. In a case such as this I can see why you
might want to use md5() to hash that value.
Best Wishes,
Chris Travers