HP-UX Internet Services Administrator's Guide (August 2003)

TCP Wrappers
IPv6 Support
Chapter 3 53
IPv6 Support
To enable access control mechanism to IPv6 connections of a service, you
must enable IPv6 support to that service in the /etc/inetd.conf file.
You must specify the protocol in the /etc/inetd.conf file as tcp6 or
upd6, to enable IPv6 support for a particular service.
For example, to support IPv6 functionality for the ftpd service, you must
modify the /etc/inetd.conf file as follows:
ftp stream tcp6 nowait root /usr/bin/ftpd ftpd -l
However, if you specify tcp instead of tcp6, ftp operates in the IPv4
mode.