You have already seen how you can specify network or specific IP addresses in the ACLs in the configuration file. You can also restrict access to particular MAC addresses:
acl bible arp 00:11:22:33:44:55 http_access allow bible
This pair of lines allows the host bible to access the proxy. This works only if bible is directly connected to the same physical Ethernet network as the server. You can add multiple pairs of lines such as the previous lines for each permitted client machine on the network.
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