/etc/sysconfig/network-scripts/ifcfg-ppp0 is a shell script which contains configuration
information for Roaring Penguin's ADSL scripts. Note that pppoe.conf
is used only by the various adsl-* shell scripts, not by pppoe
itself.
ifcfg-ppp0 consists of a sequence of shell variable assignments.
The variables and their meanings are:
ETH
The Ethernet interface connected to the ADSL modem (for example, eth0).
If this is not blank, then it is passed with the -S option to
pppoe. It specifies a service name to ask for. Usually, you
should leave it blank.
ACNAME
If this is not blank, then it is passed with the -C option to
pppoe. It specifies the name of the access concentrator to connect
to. Usually, you should leave it blank.
DEMAND
If set to a number, the link is activated on demand and brought down
after after DEMAND seconds. If set to no, the link is kept
up all the time rather than being activated on demand.
DNSTYPE
One of NOCHANGE, SPECIFY or SERVER. If
set to NOCHANGE, adsl-connect will not adjust the DNS setup in
any way. If set to SPECIFY, it will re-write /etc/resolv.conf with
the values of DNS1 and DNS2. If set to SERVER, it will
supply the usepeerdns option to pppd, and make a symlink
from /etc/resolv.conf to /etc/ppp/resolv.conf.
DNS1, DNS2
IP addresses of DNS servers if you use DNSTYPE=SPECIFY.
USERCTL
If the line USERCTL=yes (exactly like that; no whitespace or comments)
appears in the configuration file, then /sbin/ifup will allow
non-root users to bring the conneciton up or down.
PEERDNS
If set to "yes", then adsl-connect will supply the usepeerdns
option to pppd, which causes it to obtain DNS server addresses
from the peer and create a new /etc/resolv.conf file. Otherwise,
adsl-connect will not supply this option, and pppd will not
modify /etc/resolv.conf.
CONNECT_POLL
How often (in seconds) adsl-start should check to see if a new PPP
interface has come up. If this is set to 0, the adsl-start simply
initiates the PPP session, but does not wait to see if it comes up
successfully.
CONNECT_TIMEOUT
How long (in seconds) adsl-start should wait for a new PPP interface
to come up before concluding that adsl-connect has failed and killing
the session.
PING
A character which is echoed every CONNECT_POLL seconds while
adsl-start is waiting for the PPP interface to come up.
FORCEPING
A character which is echoed every CONNECT_POLL seconds while
adsl-start is waiting for the PPP interface to come up. Similar
to PING, but the character is echoed even if adsl-start's
standard output is not a tty.
PIDFILE
A file in which to write the process-ID of the adsl-connect process
(for example, /var/run/pppoe.pid). Two additional files
($PIDFILE.pppd and $PIDFILE.pppoe) hold the process-ID's of the
pppd and pppoe processes, respectively.
SYNCHRONOUS
An indication of whether or not to use synchronous PPP (yes or
no). Synchronous PPP is safe on Linux machines with the n_hdlc
line discipline. (If you have a file called "n_hdlc.o" in your
modules directory, you have the line discipline.) It is not
recommended on other machines or on Linux machines without the
n_hdlc line discipline due to some known and unsolveable race
conditions in a user-mode client.
CLAMPMSS
The value at which to "clamp" the advertised MSS for TCP sessions. The
default of 1412 should be fine.
LCP_INTERVAL
How often (in seconds) pppd sends out LCP echo-request packets.
LCP_FAILURE
How many unanswered LCP echo-requests must occur before pppd
concludes the link is dead.
PPPOE_TIMEOUT
If this many seconds elapse without any activity seen by pppoe,
then pppoe exits.
FIREWALL
One of NONE, STANDALONE or MASQUERADE. If NONE, then adsl-connect does
not add any firewall rules. If STANDALONE, then it clears existing firewall
rules and sets up basic rules for a standalone machine. If MASQUERADE, then
it clears existing firewall rules and sets up basic rules for an Internet
gateway. If you run services on your machine, these simple firewall scripts
are inadequate; you'll have to make your own firewall rules and set FIREWALL
to NONE.
PPPOE_EXTRA
Any extra arguments to pass to pppoe
PPPD_EXTRA
Any extra arguments to pass to pppd
LINUX_PLUGIN
If non-blank, the full path of the Linux kernel-mode PPPoE plugin
(typically /etc/ppp/plugins/rp-pppoe.so.) This forces
adsl-connect to use kernel-mode PPPoE on Linux 2.4.x systems.
This code is experimental and unsupported. Use of the plugin causes
adsl-connect to ignore CLAMPMSS, PPPOE_EXTRA, SYNCHRONOUS and
PPPOE_TIMEOUT.
By using different configuration files with different PIDFILE
settings, you can manage multiple PPPoE connections. Just specify the
configuration file as an argument to adsl-start and adsl-stop.
