>>> NAT (I believe AOL did/does something like this) so requests from
>>> the same user behind the NAT can appear to be coming from
>>> different public IP addresses.
>>
>> AOL certainly does this.  Either that or my own little web site has an
>> astonishingly high number of different AOL users hitting it.
> 
> I wonder - what percentage of net users do use AOL as their ISP?

A disappointingly large number...I think my grandparents still 
use it for dial-up despite efforts to get them moved to something 
less wallet-emptying.

> So, I think I won't bother with the IP address checking. 

A fairly good idea...the only time I've found that IP address 
checking was worthwhile was on an intranet rather than the public 
internet, so there were known IP-address allocations.  An 
intranet app doesn't necessarily predicate IP checking, as you 
might still have address hand-offs as a user unplugs from the 
wired LAN and moves to a WiFi subnet.  So it should be the known 
network architecture combined with a legitimate business-rule 
need (that accommodates the architecture) that predicates any 
sort of IP address checking.  This is sufficiently rare that you 
most likely don't want/need to invest the time in doing so.

-tim




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