Determining remote hostname from remote connections

[Roberto Togneri]

Is there a way under Unix (esp. SunOS 4.1.1.) to check from which host a
user is logging in from and limit logins to a particular set of hosts or
domains. This would be handy for setting up secure nopassword logins. With
irises a REMOTEHOST variable is set which can be used. No such variable is
defined with our Suns.

If anybody can help I'd appreciate it.

Dr. Roberto Togneri                         Phone: +61-9-380-2535
Dept. of Electrical & Electronic Engineering
The University of Western Australia         Fax:   +61-9-380-1065
NEDLANDS WA 6009 Australia                  Email: robert at swanee.ee.uwa.oz.au