I'm attempting to port an existing xinetd service from CentOS 6 to 
something equivalent with systemd for CentOS 7

The existing xinetd config uses the attributes 'only_from' to limit 
connections from a limited set of remote hosts and 'banner_fail' to 
print a suitable error message when access is denied

However, I can't find suitable 'equivalents' with systemd socket/service 
files on CentOS 7

It appears later versions of systemd supports the option IPAddressAllow= 
(which is what I think I need ?)

Does anyone know how to limit the remote hosts that can connect to a 
port with CentOS 7's systemd ?

Also, how to implement the equivalent of 'banner_fail' ? (not absolutely 
required, but nice to have)

Thanks

James Pearson
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