squid

[Barry Brimer]

>                   i am trying to configure squid.
> i wanna block my some clients with mac address.
> i have enable ollowing ACL bt it`s not working so please help me.
>
> acl mac arp my_mac_address
> http_access allow mac
>
> i  m using squid 2.6 stable.

Have you read 
<http://www.cyberciti.biz/faq/howto-linux-unix-squid-mac-address-filtering/>

Most importantly, is your squid compiled with the --enable-arp-acl flag?

Barry