| 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. |
| |
