HP-UX Reference (11i v3 07/02) - 1M System Administration Commands N-Z (vol 4)

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ypserv(1M) ypserv(1M)

-l log_file Log diagnostic and error messages to the ﬁle, log_ﬁle. See the description above.

-s Secure. When speciﬁed, only NIS servers bound to a reserved port are used.

This allows for a slight increase in security in completely controlled environ-

ments, where there are no computers operated by untrusted individuals. It

offers no real increase in security.

-ypset Allow ypset to be used to change the binding (see ypset(1M)). For maximum

security, this option should be used only when debugging the network from a

remote machine.

-ypsetme Allow ypset to be issued from this machine (see ypset(1M)). Security is based

on IP address checking, which can be defeated on networks where untrusted

individuals may inject packets. This option is not recommended.

-broadcast When ypbind is invoked with this option,

ypbind will try to establish a bind-

ing by broadcast even though the ﬁle

/var/yp/binding/

domain_name/ypservers exists. That is, the option

-broadcast overrides the existence of this ﬁle.

If -broadcast is used in conjunction with -ypset or -ypsetme, then the

-broadcast option is ignored. If ypbind is invoked with option -ypset or

-ypsetme the NIS servers list in the ﬁle

/var/yp/binding/domain_name

/ypservers is ignored.

WARNINGS

NIS uses ndbm ﬁles to store maps. Therefore, it is subject to the 1024 byte limitations described in the

WARNINGS section of the ndbm(3X) man page.

The NIS Version 1 protocol will not be available in a future HP-UX release. HP recommends that you use

the next version of this protocol.

AUTHOR

ypserv, ypbind, and ypxfrd were developed by Sun Microsystems, Inc.

FILES

/var/yp/binding/

domainname.version

These ﬁles cache the last successful binding created for the given

domain, in order to to speed up the binding process. When a binding

is requested, these ﬁles are checked for validity and then used.

/var/yp/securenets

This ﬁle is read by both ypserv and ypxfrd at startup time. It

deﬁnes the hosts and networks which are granted access to informa-

tion in the served domain.

/var/yp/secureservers

This ﬁle is read by ypbind. It contains a list of IP addresses that

ypbind will receive a binding from.

/var/yp/binding/

domain_name/ypservers

This ﬁle is read by ypbind. It contains the list of NIS servers that

ypbind will attempt to bind to, if ypbind is not invoked with a

-broadcast option.