Can I restrict use of the proxy to a set of nominated IP addresses?
We don’t provide a way of doing this. It would be easy to add, but before you do please consider why you want to do it. If the reason is security, it probably means you need a firewall. The -h option provides a way of binding the proxy to a single IP address/port. This can be used in some network configurations to give some selectivity on who can access your Internet Junkbuster, but it doesn’t provide a general mechanism. The Internet Junkbuster is not a firewall proxy; it should not be expected to solve security problems. For background information on firewalls, see an FAQ or these well-known books: Firewalls and Internet Security: Repelling the Wily Hacker by William R. Cheswick and Steven M. Bellovin or Building Internet Firewalls by D. Brent Chapman Elizabeth D. Zwicky. There’s free Linux software available, and a large number of commercial products and services. For an excellent security overview, primer, and compendium reference, see Practical Unix and Internet Security by Simson
