Apache auth
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To get apache allowing a subnet through without a password,
but require a password for anywhere else, do the following
in httpd.conf:

        AllowOverride None
        order deny,allow
        deny from all
        allow from 192.168.1
        AuthType Basic
        AuthName "Password protected"
        AuthUserFile /path/to/.htpasswd
        require valid-user
        Satisfy any