10-18-2012
Hi bakunin,
I used your method and found out the problem was with HostA, because it can connect to every hosts but none can connect to it. so I asked system admin to check on the netgroups that HostA belonged to and eventually we realized there was a particular netgroup hostA should be added to.
The connection is working now. A method or a thought to investigate a problem is more valuable than a direct answer, because that would help people to learn more stuff.
Thanks for your help.
Aaron
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LEARN ABOUT NETBSD
netgroup
NETGROUP(5) BSD File Formats Manual NETGROUP(5)
NAME
netgroup -- defines network groups
SYNOPSIS
netgroup
DESCRIPTION
The netgroup file specifies ``netgroups'', which are sets of (host, user, domain) tuples that are to be given similar network access.
Each line in the file consists of a netgroup name followed by a list of the members of the netgroup. Each member can be either the name of
another netgroup or a specification of a tuple as follows:
(host, user, domain)
where the host, user, and domain are character string names for the corresponding component. Any of the comma separated fields may be empty
to specify a ``wildcard'' value or may consist of the string ``-'' to specify ``no valid value''. The members of the list may be separated
by whitespace; the ``'' character may be used at the end of a line to specify line continuation. The functions specified in getnetgrent(3)
should normally be used to access the netgroup database.
If 'files' is specified for the 'netgroup' database in nsswitch.conf(5), (or no 'netgroup' entry is specified), then these functions operate
on the db(3) version of the netgroup (netgroup.db) file which can be generated using netgroup_mkdb(8). If 'nis' is specified then the NIS
maps 'netgroup', 'netgroup.byhost', and 'netgroup.byuser' are used.
Lines that begin with a # are treated as comments.
FILES
/etc/netgroup.db the netgroup database.
SEE ALSO
getnetgrent(3), exports(5), nsswitch.conf(5), netgroup_mkdb(8)
COMPATIBILITY
The file format is compatible with that of various vendors, however it appears that not all vendors use an identical format.
BUGS
The interpretation of access restrictions based on the member tuples of a netgroup is left up to the various network applications.
BSD
January 16, 1999 BSD