DW is still posting from IP 64.228.30.29. I don't know if he has others
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I agree that the prevalence of dynamically allocated IP addresses makes
banning by IP address undesirable (though in principle it should often be
possible to determine whether an IP address is statically or dynamically
allocated.
If this turns out a be a serious problem, one idea would be to only allow
logged-in users to make changes (except in the Sandbox).
M Carling