[squid-users] One Squid and 2 DG Connection Restriction Howto ??

Hi,
I have 2 computers, let say
A :192.168.0.10
and
B : 192.168.0.11

For A,
Squid 2.6 Stable1, DG 2.9.7.1 are installed.

For B,
Only DG 2.9.7.5 is installed.

My purpose is;
Squid must listen only 127.0.0.1:3128(for comp. A) and 192.168.0.28
for requests from Computer B's IP. Other connection requests should be
discarded. All requests should be forwarded to squid from DG installed
on A and B.

To do this;
I changed http_port to 3128 from 127.0.0.1:3128. In this case, any
client who can change his/her proxy settings is able to connect proxy
directly.(As expected) This works, but not suitable for my purpose.

What will be the correct conf?

A simple diagram for struc.
-----------------------------------------------

Client Group 1 ----------------> B
                                           |
 Client Group 2 ----------------> A ----- Internet

-- 
Birol AKBAY
birolakbay@gmail.com