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- Microsoft Call Back Configuration Protocol.
- by Pedro Roque Marques
- (updated by Paul Mackerras)
- The CBCP is a method by which the Microsoft Windows NT Server may
- implement additional security. It is possible to configure the server
- in such a manner so as to require that the client systems which
- connect with it are required that following a valid authentication to
- leave a method by which the number may be returned call.
- It is a requirement of servers to be so configured that the protocol be
- exchanged.
- So, this set of patches may be applied to the pppd process to enable
- the cbcp client *only* portion of the specification. It is primarily
- meant to permit connection with Windows NT Servers.
- The ietf-working specification may be obtained from ftp.microsoft.com
- in the developr/rfc directory.
- The ietf task group has decided to recommend that the LCP sequence be
- extended to permit the callback operation. For this reason, these
- patches are not 'part' of pppd but are an adjunct to the code.
- To enable CBCP support, all that is required is to uncomment the line
- in Makefile.linux that sets CBCP=y and recompile pppd.
- I use such script to make a callback:
- pppd debug nodetach /dev/modem 115200 crtscts modem \
- callback 222222 name NAME remotename SERVER \
- connect 'chat -v "" atz OK atdt111111 CONNECT ""'
- sleep 1
- pppd debug /dev/modem 115200 crtscts modem \
- name NAME remotename SERVER defaultroute \
- connect 'chat -v RING ATA CONNECT "\c"'
- First we invoke pppd with 'nodetach' option in order to not detach from
- the controlling terminal and 'callback NUMBER' option, then wait for
- 1 second and invoke pppd again which waits for a callback (RING) and
- then answers (ATA). Number 222222 is a callback number, i.e. server will
- call us back at this number, while number 111111 is the number we are
- calling to.
- You have to put in /etc/ppp/chap-secrets the following two lines:
- NAME SERVER PASSWORD
- SERVER NAME PASSWORD
- You have to use your real login name, remote server name and password.
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