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Solstice PPP 3.0.1 Administration Guide

Generic Internet Server Configuration

Figure 5-5 shows a large number of clients connected to a server using asynchronous links. Clients initiate calls to the server, and request an IP address for the connection. The server has a pool of IP addresses, and a pool of modems, which it allocates to clients as required. In this example, the server requires authentication using the Password Authentication Protocol (PAP).

This configuration is typical of connections between clients and a generic Internet server.

Figure 5-5 Dynamic IP Address Allocation

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The server has a pool of IP addresses equal to the number of modems it has connected to it. It assigns these addresses to remote clients on request, for as long as there are modems available. Clients use pppconn(1M) to establish a PPP link to the server, and to recover an IP address for the IP connection. 


prompt# /usr/bin/pppconn server

In the following example, a total of n clients can make connections to a server with a pool of eight modems; therefore, eight clients can be connected simultaneously.

PPP Configuration File (ppp.conf) for client_0:


ifconfig ipdptp0 plumb
ifconfig ipdptp0 netmask 255.255.255.0 down

dialup_path
    ip_interface         ipdptp0
    request_ip_addr      on
	remote_host   server
    send_authentication  pap
    send_pap_id          pap_id0
    send_pap_passwd      pap_passwd0

Link Configuration File (link.conf) for client_0:


dialup_device pppdev0
    unix_device          ttya
    line_speed           38400
    modem                BocaModem V.34 DataFax
    call_setup           dial

remote_host  server
    phone                1234561000
    chat_script          server.script

CHAT script (server.script) used by client_0 to call server:


# Set the line regarding the remote site configuration
# Due to UUCP limitations some systems only accept cs7
#
# setline	cs7 parodd

send	   RETURN
expect	 "ogin:"  10  onerror send BREAK repeat 3

send	   "clnt_0"
expect	 "word: " 40
#
# Set the ppp password of the remote host here
#
send	  "clnt_0-pass"

PPP Configuration File (ppp.conf) for server:


ifconfig ipdptp0 plumb
ifconfig ipdptp0 local remote0 netmask 255.255.255.0 down

ifconfig ipdptp1 plumb
ifconfig ipdptp1 local remote1 netmask 255.255.255.0 down

ifconfig ipdptp2 plumb
ifconfig ipdptp2 local remote2 netmask 255.255.255.0 down
	.
	.
ifconfig ipdptp8 plumb
ifconfig ipdptp8 local remote8 netmask 255.255.255.0 down

dialup_path
    ip_interface             ipdptp*
    expect_login_id          clnt_0
    expect_authentication    pap
    expect_pap_id            pap-id0
    expect_pap_passwd        pap_passwd0

dialup_path
    ip_interface             ipdptp*
    expect_login_id          clnt_1
    expect_authentication    pap
    expect_pap_id            pap-id1
    expect_pap_passwd        pap_passwd1

dialup_path
    ip_interface             ipdptp*
    expect_login_id          clnt_2
    expect_authentication    pap
    expect_pap_id            pap-id2
    expect_pap_passwd        pap_passwd2
	.
	.
dialup_path
    ip_interface            ipdptp*
    expect_login_id         clnt_n
    expect_authentication   pap
    expect_pap_id           pap-idn
    expect_pap_passwd       pap_passwdn

Link Configuration File (link.conf) for server:


dialup_device pppdev0
    unix_device            tty0
    line_speed             38400
    modem                  Cardinal V.34/V.FC 28.8 data/fax
    call_setup             answer

dialup_device pppdev1
    unix_device            tty1
    line_speed             38400
    modem                  Cardinal V.34/V.FC 28.8 data/fax
	call_setup                 answer

dialup_device pppdev2
    unix_device            tty2
    line_speed             38400
    modem                  Cardinal V.34/V.FC 28.8 data/fax
    call_setup             answer
	.
	.
	.
	.
dialup_device pppdev10
    unix_device            tty8
    line_speed             38400
    modem                  Cardinal V.34/V.FC 28.8 data/fax
    call_setup             answer

User account on server used to accept calls from client_0:

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