said by TKJunkMail 
:said by vpoko :Well, they don't really have to maintain a list of IP addresses. The government supplies them a list of URL's and they can just block those URL's at the DNS level. If someone wants to access a porn site by typing in its IP address, that's technically different from the using the URL.
I meant customer IP's, not the list of porn IP's.
But you bring up a good point on how do you implement this so that some customers can block the porn sites and some can see the porn sites.
Do you force customers thru the DHCP procedure to use different DNS servers(1 for porn and 1 for no-porn). Which is easily overridden, even by non-geek children, in the routers setup and in the pc's browser config.
Or do you force all subscribers who want no-porn to go thru a proxy server, which would be the only IP address accessible thru a restrictive setup in the cable or DSL modem.
Or are their easier ways on how to differentiate between porn and no-porn customers.
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