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Preventing Internet Access

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Preventing Internet Access - 5.Jun.2001 3:51:00 PM   
jstefani

 

Posts: 8
Joined: 2.Feb.2001
From: Temecula, CA, USA
Status: offline
Here's my scenerio. Internal IP Subnet 192.168.2.x /24 with 2.254 as ISA Server internal interface. NT 4.0 Domain with ISA Server as a member server joined to the domain. DHCP running with a scope of 192.168.2.10 ~ 100. Firewall clients installed on Windows 98 OS. I know I can create client access groups (by IP address)to prevent user access to the Internet, but this can be quite a pain with DHCP running. I don't want to assign statics to users, yet I don't want that user to remove the firewall client and plug in the default gateway of 192.168.2.254 and have immediate access to the Internet. Any ideas?

------------------
John J. Stefani
MCSE-2K / MCT / CNE

Post #: 1
RE: Preventing Internet Access - 5.Jun.2001 6:42:00 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi John,

Win9x are low security environments, so you have to use workarounds.

Try this: Configure the HTTP redirector filter to drop requests from SecureNAT and Firewall clients. Then configure the web browsers as web proxy clients. Now, if the user tries to configure a gateway address, their web requests will be dropped.

You can then configure site and content rules to control access to web content.

HTH,
Tom

------------------
Tom Shinder
http://www.isaserver.org/shinder/

Get It Here


(in reply to jstefani)
Post #: 2
RE: Preventing Internet Access - 19.Jun.2001 6:50:00 PM   
Bronco3006

 

Posts: 3
Joined: 17.May2001
From: Wichita Falls, TX, USA
Status: offline
quote:
Originally posted by jstefani:
Here's my scenerio. Internal IP Subnet 192.168.2.x /24 with 2.254 as ISA Server internal interface. NT 4.0 Domain with ISA Server as a member server joined to the domain. DHCP running with a scope of 192.168.2.10 ~ 100. Firewall clients installed on Windows 98 OS. I know I can create client access groups (by IP address)to prevent user access to the Internet, but this can be quite a pain with DHCP running. I don't want to assign statics to users, yet I don't want that user to remove the firewall client and plug in the default gateway of 192.168.2.254 and have immediate access to the Internet. Any ideas?


What I did was set my DHCP router options to be the Internal IP address of my ISA server.

I installed my ISA server in its own domain and established a trust relationship between it an my NT 4.0 domains.

In each NT 4.0 domain, I created user groups for Internet Access, and added members to those groups.

On the ISA Server, I configured Internet access for the groups from the NT 4.0 domains. Both proxy clients and firewall clients must be authenticated in order to access the Internet.

Hope this helps.

George


(in reply to jstefani)
Post #: 3
RE: Preventing Internet Access - 21.Jun.2001 6:26:00 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi George,

Thanks for the setup tip! Looks good.

Tom

------------------
Tom Shinder
http://www.isaserver.org/shinder/

Get It Here


(in reply to jstefani)
Post #: 4

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