About netgroups

The /etc/netgroup file defines network-wide groups used for permission checking when fielding requests for remote mounts, remote logins, and remote shells. For remote mounts, the information in netgroup is used to classify machines; for remote logins and remote shells, it is used to classify users. NIS clients can use netgroups to include the map entries for the members of a netgroup in the password file, /etc/passwd. See ``Using NIS maps in the password file'' for more details.

Each line of the netgroup file defines a group and has the format

groupname member_1 member_2

where member is either another group name or a triple (in the following format, parenthesis included):

(hostname,username,domainname)

Any of these three fields can be empty, in which case it signifies a wildcard. Thus the entry

   universal (,,)

The domainname field must either be the local domain name or empty for the netgroup entry to be used. This field does not limit the netgroup or provide security. The domainname field refers to the domain in which the triple is valid, not the domain containing the trusted host.

A gateway machine should be listed under all possible host names by which it may be recognized:

   wan (volga,,) (volga-cities,,)

   justmachines   (amazon,-,sun)
   justpeople(-,babbage,sun)

   (,,domain)

   (,,)

Network groups are contained in the Network Information Service and are accessed through these files:

/etc/yp/domainname/netgroup.dir
/etc/yp/domainname/netgroup.pag
/etc/yp/domainname/netgrp.usr.dir
/etc/yp/domainname/netgrp.usr.pag
/etc/yp/domainname/netgrp.hst.dir
/etc/yp/domainname/netgrp.hst.pag

These files can be created from /etc/netgroup using makedbm(NADM).

See also:

• ``Creating netgroups''

• ``Setting export access permissions''

• netgroup(NF)

Home Notes   Home   MCSE   MCSE + Security   CCNA   CCNP   Schedule   Register   Frequently Asked Questions   Course Fees   Contact US   Boot Camp Location   Compare us to our competitors   Testimonials   Sitemap

Testimonials

Join MCSE Boot Camp & CCNA Boot Camp Back to Back Certification Today. links  270    290    291  293    294  298  299  Security  640-801  routing 811  821   831  Resources MCSE + CCNA  Training  Card pay  Papal  MCSE Notes  CCNA Notes    index main  root link  resources home    Ref1 Ref2

Vibrant offers MCSE certification training boot camp for $5400 all inclusive, instructor led at California and Baltimore.

Vibrant Bootcamp Participants come from All Around the World. Vibrant has trained students from more than 15 countries like USA, UK, (Scotland, Ireland, Wales), Switzerland, Germany, Australia, Canada, France, Holland, Japan, Belgium, Bahrain, New Zealand, Tanzania, Turkey, Kenya and more.