blocking telnet to selected IPs?

[Peter Murray]

--On Tue, Jul 7, 1998 12:34 PM -0700 "Dave Vose"
<dvose at library.lib.binghamton.edu> wrote: 

> We may be forced to discontinue email access in the library but we'd like
to
> retain telnet capability for access to other OPACs, etc. Is there a way 
> to block telnet access to selected IP addresses in Netscape 3.x and 
> 4.x?

If you have access to the machines providing the e-mail access and if they
are UNIX machines, you can install the TCP Wrappers package on the e-mail
machines to deny access from your OPAC stations.  Here is some info about
the TCP Wrappers package:

  With this package you can monitor and filter incoming requests for the
  SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other
  network services.

  The package provides tiny daemon wrapper programs that can be installed
  without any changes to existing software or to existing configuration
  files.  The wrappers report the name of the client host and of the
  requested service; the wrappers do not exchange information with the
  client or server applications, and impose no overhead on the actual
  conversation between the client and server applications.

This package is maintained by Wietse Venema (wietse at wzv.win.tue.nl), and a
mirror in the USA can be found at: 

   ftp://coast.cs.purdue.edu/pub/tools/unix/tcp_wrappers/


Peter
--
Peter Murray, Library Systems Manager                    pem at po.cwru.edu
Digital Media Services                 http://www.cwru.edu/home/pem.html
Case Western Reserve University, Cleveland, Ohio          W:216-368-5888