how to stop reverse DNS lookup for the vsftpd in linux

Dear Sir/Madam:

Have redhat enterprise linux working as ftp server (vsftpd) please tell me how to disable reverse dns lookups for the ftp login , how to do this in vsftpd.conf

thanks in advance
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This should do it:

# Do not perform ident nor DNS lookups
IdentLookups off
UseReverseDNS off
My bad- information claimed vsftpd, but was for proftp.  

vsftpd does not have this in a config file-   I did find a more relevant discussion here, which leads to PAM and the vsftpd source code.....


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