Clark connect does appear to be able to use MAC filtering
http://www.clarkconnect.co
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Blocking access to internet VIA mac address
I have Clark Connect 5.0, I have 59 users that access the internet through the SQUID Proxy server, this works well for users that have a password, but anyone on the network can use SKYPE or SMTP without haveing to authenticate. Is there a way that i can just allow access to the internet VIA MAC address? Thanks
John Carlson
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Answers
You need a firewall at the edge of your network that only allow the proxy out, so anyone not using it is blocked.
Internet--Firewall--Proxy-
|--------------Bad users
A simple (hardware, iptables on linux, ISA on Microsoft) firewall at the edge of your network will do this, even some DSL routers can be configured to do this or if you've something like a Cisco router at your edge you can configure it with acls
I'm a little confused as to your set up, the ideal setup is all users go through the Clark server. How do users connect to the internet and bypass it? Do they just select no proxy? If so it sounds like your actual edge device (modem / router) is open. What type of connection do you have to the internet (DSL modem?, router? internet pipe?)
Draw me a picture if it helps....
------------ ---------- ---------
| Internet |-----| ???? |------| Clark |---- Good Users
------------ ---------- ---------
|-------------------------
I need to know how you connect to your ISP
The Clark Connect box is the only connection to the internet. It connects to a Sattelite Router. So all users do go through the Clark Box. The setup is just that if they have the username/password they are allowed to use HTTP, HTTPS and FTP. If not they can't but they can still use SMTP, SKYPE or any other protocol to get to the internet. If they select no proxy, they get an error telling them to setup the proxy in their web browser.
------------ ----------------- - ---------
| Internet |-----| SAT MODEM |------| Clark |---- Good Users
------------ ------------------- --------- \ -------------------------B
don't think so the squid bit (forwarding http, https and ftp) is working OK.
Looks like you need to configure the firewall bit
http://www.clarkconnect.co
specifically the outbound connectios
http://www.clarkconnect.co
After talking with Clark Conenct tech support, they don't think it can be done. SO i'm left with a network that is pretty much open, anyone can find an open ip address, and gateway out as long as they don't use http, https, or ftp. Does anyone know of another software firewall that i can simply alllow or not allow based on MAC, IP, or useraname? Thanks Much
JOhn
iptables should be part of the Operating system on the machine, this link may help as a starter:
http://wiki.vpslink.com/HO
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by: liddlerPosted on 2009-08-17 at 03:28:47ID: 25112905
How are they connecting to the internet? Do they go through a proxy of some sort?
Assuming you have a firewall between the users and the internet you can block smtp (port 25) for all machines, except your email server, also only allow outbound port 80 and 443 from the squid proxy and block 5599 (skype). I don't know Clark Connect, but by the look of there website, one you block all users from reaching the internet except via that and the proxy, it should be able to block on a protocol basis.