hello, i have a domain name zzz.com, an a record a.zzz.com and 2 cname recods b.zzz.com and c.zzz.com. the dns server is configure good. i have also a ubuntu dapper installed on my pc and i want to configure apache 2 to respond only if a client access b.zzz.com. if a client access a.zzz.com or c.zzz.com the server must not responding. thank you.