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Problem setting users for my PPP server

Hi,
I am facing two options (when it comes to create ppp users/group) and it's
not clear to me whether I should use the first one or the second.
And why should I use one but not the other..or what is the implication of
both of them. And can I use both at the same time?

1st OPTION: :  Add a group called modem:
        # groupadd -g 800 modem
- Add each user with a false shell, a member of the group "modem":

        # /usr/sbin/adduser -s /bin/false -g modem -n <user_name> 
  For ie, you wanna adduser the new user ericks with last policy:
  Instead of a simple "adduser ericks" command, you can do:
  /usr/sbin/adduser -s /bin/false -g modemuser -n ericks  (-s: shell; -g:
group; -n: no_autogroup)

 
  or simply..adduser -s /bin/false -g modemuser -n ericks

  And dont forget :
        # passwd ericks
 Each user will have a blank passwd, copy the encrypted passwd from
        that users bioserve account to the /etc/passwd file.


2nd OPTION: You can create a user, and in /etc/passwd, replace it's shell
(/bin/bash)
                   by /usr/sbin/pppd ( or a script file). Make sure
/usr/sbin/pppd (or that script file)
                   appears in /etc/shells