domain ip

How do I perform dns lookup under Linux or UNIX or OS X operating systems without using 3rd party web sites for troubleshooting DNS usage?

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I’ve proxy (mod_proxy) enabled for Apache under Debian Linux 4.0 server. I’d like to use this to improve performance, but I don’t want an open proxy that can be used by anyone on the Internet? How do I secure my proxy as limiting access is essential as I’m using a forward proxy?

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