[windows2000] Re: Blocking Internet Access On A Schedule THE SOLUTION - formerly Re: Re: Blocking Internet Browsing from Explorer.exe
- From: "Sullivan, Glenn" <GSullivan@xxxxxxxxxxxxxx>
- To: "'windows2000@xxxxxxxxxxxxx'" <windows2000@xxxxxxxxxxxxx>
- Date: Mon, 1 Dec 2003 09:38:45 -0500
What if someone gets smart and modifies the hosts file themselves?
Or changes the proxy settings to an IP address instead of a host-name?
Or makes a web site (the entire thing) available offline, for browsing while
the hosts file is screwed?
I'm with Ray on this one... secure the "data" (the internet connection) and
not the program accessing the data...
But it IS fun to f' with students sometimes... ;-)
Glenn Sullivan, MCSE+I MCDBA
David Clark Company Inc.
-----Original Message-----
From: Mark Lee [mailto:marklee15@xxxxxxxxx]
Sent: Friday, November 28, 2003 4:39 AM
To: windows2000@xxxxxxxxxxxxx
Subject: [windows2000] Blocking Internet Access On A Schedule THE SOLUTION -
formerly Re: Re: Blocking Internet Browsing from Explorer.exe
Ok Folks, as posted yesterday here's what we did.
1. Wrote a small EXE called BLOCKDNS.EXE which takes a few params but
basically adds and entry from command line to the windows hosts file
2. All IE browsers etc. are forced by policy to use a web proxy, but
bypassed for internal intranet
3. All PC's on internal IP so cannot directly surf anyways !
4. On schedule BLOCKDNS.EXE is called to add/remove 127.0.0.1 to hosts file
with our FQDN for the web proxy (might also want to call ipconfig /flushdns
to be 100% sure cached entries are gone)
This way, IE can still be used internally to access our Intranet etc. but
cannot see the proxy, therefore, cannot see the outside world ! This works
like a charm, students hate us even more now, staff think it's cool !
Mark.
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