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       lg_intro - introduction to the looking glass


       The  looking  glass  offers  a  web based interface to routers to users
       without their needing permission to login to the router.  This may be a
       perfect  interface  for  customer support or less savvy folks, and many
       ISPs have given public access to such an interface as a "route server."


       The looking glass consists of  two  CGI  perl(1)  scripts,  lg.cgi  and
       lgform.cgi, and the lg.conf(5) configuration file.

       Both  of  these  scripts begin with reading the configuration file.  If
       there is an error in the file's syntax or if the file can not be found,
       error  messages  will  be displayed on standard-error.  The Apache http
       server redirects standard-error to its error log file by default.

       lgform.cgi displays a html form consisting of a list of possible router
       commands  that  can  be  run and a scrolling list of routers that these
       commands may be run on.  When the form is submitted, lg.cgi is run.

       lg.cgi begins by performing some basic checks on the  arguments  passed
       to it.  If these checks pass, lg.cgi either displays cached data from a
       previous invocation, if that  data  exists  and  is  within  the  cache
       interval,  or  uses  clogin(1)  to  login to the device and execute the
       command.  The results of the  command  are  cached  if  applicable  and
       displayed for the user.


       Besides  lg.conf(5), additional instructions for setting up the looking
       glass can be found in the README file under /var/lib/rancid/README.lg.

       Note that the looking glass scripts require  a  few  perl  modules  not
       included  with  rancid.   Rancid's configure process does not check for
       these.  See the README file.


       cloginrc(5), clogin(1), lg.conf(5)


       Rancid's looking glass is based on Ed Kern's (included  by  permission,
       thanks Ed!), which could once be found on but
       has apparently been removed.  Support for Juniper and Foundry  devices,
       use  of  rancid's  device  login  scripts,  and additional commands and
       checks have been added to the original.

                                  24 Jan 2001                      lg_intro(1)

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