2 AIX 4.1 support is ported from the SunOS code for ppp 2.2. It requires
3 a streams-based tty and will not work on AIX 3.2. This is the first
4 release of this package for AIX. It is provided free and without warranty
9 PPP implements TCP/IP through serial connections. In ppp 2.2, an
10 interface is established by running the program 'pppd'. pppd opens
11 a serial connection, negotiates link attributes with the peer and
12 configures a TCP/IP interface. The interface remains up as long as
13 the peer stays up and 'pppd' remains running. There are no SMIT menus
14 and ppp interfaces can not be defined through ifconfig. An interface
15 can be brought down by killing pppd.
17 The program 'chat' processes send-expect sequences similar to UUCP
18 Dialers commands or a Systems chat string. It can be used to dial
21 'pppstats' prints interface statistics similar to netstat. Some of the
22 statistics are the same as netstat but pppstat also provides additional
23 info specific to ppp interfaces.
27 First execute the following commands in the ppp-2.2 directory:
30 make install (you need to be root for this)
32 By default, pppd, chat and pppstats are placed in /usr/sbin and the
33 streams modules in /usr/lib/drivers. The modules are loaded by the following
36 strload -m /usr/lib/drivers/ppp_if
37 strload -m /usr/lib/drivers/ppp_comp
38 strload -m /usr/lib/drivers/ppp_async
40 'make install' appends the strloads to /etc/rc.tcpip so the modules
41 will be loaded at boot. A 'pppd' command can be added to start
44 'make install' will also create /etc/ppp/options containing the option
45 'lock' only (lock tty device when in use). Any other options which will
46 always be used should be added by hand.
48 Man pages for pppd and pppstats are installed.
52 To answer a modem and accept connections, use something like
54 pppd tty1 myhostname:remotehostname persist
56 This will wait for calls on tty1 and establish a connection with any
57 ppp caller. The server will use myhostname and tell the caller
58 to use remotehostname. The persist option tells pppd to remain
59 active and accept another connection after the call terminates.
60 You can use the 'auth' option to force callers to authenticate
61 themselves. See pppd man page for details of authentication protocols.
63 To dial in to a user account and start PPP, use something like
65 pppd tty1 myhostname: connect 'chat -f /etc/ppp/chat-script'
67 where the file /etc/ppp/chat-script should contain something like
69 "" ATDT5551212 CONNECT "" ogin: myname sword: mypassword $ pppd
71 This command uses the chat program to dial the modem, log in and
72 start pppd on the server. No ttyname is needed when starting pppd on the
73 server side because pppd will attach to the current terminal (the tty line),
74 if no device is specified. Any pppd options needed can be set in ~/.ppprc
77 The chat -v option may be helpful in debugging connection failures. The
78 chat output and other debug messages are sent to syslog. You may need
79 to edit /etc/syslog.conf and "refresh -s syslogd" to see the debug messages.
81 The simplest way to allow a remote dial-in host to use your network is
82 to use the 'proxyarp' option on the server. This will cause the
83 server to publish an arp entry with the remote's IP address and the
84 server's hardware address. The remote will then appear to be part of
85 local network to other hosts. The address/netmask used by the remote
86 must be suitable for the subnet you wish to connect to. If the remote
87 is a standalone system, or has no other default route, use the
88 'defaultroute' option when dialing in. This will create a default route
89 on the remote system through the server. If the remote is on another
90 local network, you might not want this because it could conflict with
91 an existing default route.
93 These are just a few examples to help the new user get started. The
94 man page for pppd describes all the options in detail.