View Source: LinuxPPPoENotes - Waikato Linux Users Group

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!!! Specific PPP Configurations
* If you are using a [3ComDualLink] or any similar [ADSL] modem that uses non-standard frame types, check out [3ComDualLinkPPPoE].
* If you used Wired Country (or any of their resellers) check out LinuxWiredCountryNotes

!!! User Mode [PPPoE]

If you install roaring penguin [PPPoE] on [Linux] from the tarball, you get a few scripts named adsl-start, adsl-connect etc.

[Debian]'s __pppconfig__, among others, uses a much tidier way using __pppd__'s "call" parameter and __/etc/ppp/peers__ entries.

Here is an example entry for a [PPPoE] connection.  In the following, you would replace ''ISP'' with the PPPoE service name on your modem/AccessConcentrator, ''eth0'' with the ethernet device connected to your AccessConcentrator, ''foo@myisp.com'' with your username, ''myisp'' with a label for your ISP and ''mypassword'' with your password.

__/etc/ppp/peers/myisp__:
<verbatim>
 pty '/usr/sbin/pppoe -p /var/run/pppoe.conf-adsl.pid.pppoe  -m 1412 -U -T 80 -I eth0 -S ISP'
 holdoff 5
 #debug
 persist
 ipcp-accept-remote
 ipcp-accept-local
 noauth
 defaultroute
 hide-password
 user foo@myisp.com
 lcp-echo-interval 5
 lcp-echo-failure 5
 remotename myisp
 maxfail 0
</verbatim>
__/etc/ppp/pap-secrets__:
<verbatim>
 "foo@myisp.com"    myisp      "mypassword"
</verbatim>

Now, typing __pppd call myisp__ should connect the the AccessConcentrator then establish the [PPP] connection with the RemoteAccessNode (in the case of [ADSL]).

!!! Kernel Mode [PPPoE]

The Linux kernel now has a built in [PPPoE] framer.  Using the kernel mode [PPPoE] driver seems to yield measurably (but not noticably) lower [CPU] load than the userland client.

The framer provides a pty __/dev/ppp__ for __pppd__ to talk to, but it still needs a [PPPoE] plugin. The ppp package includes one which is supplied by the good folk at [Roaring-Penguin | http://www.roaringpenguin.com]. Oddly enough, the best docs for kernel mode seem to be in the usermode package, see __doc/KERNEL-MODE-PPPOE__.

You need a sufficiently recent version of ppp -- 2.4.2 is the minimum --, and your [Kernel] must have support for the following (this is for 2.6):

<verbatim>
 CONFIG_PPP=m
 CONFIG_PPP_ASYNC=m
 CONFIG_PPP_DEFLATE=m
 CONFIG_PPP_BSDCOMP=m
 CONFIG_PPPOE=m
</verbatim>

You will also need the appropriate character device, in case it doesn't exist:

<verbatim>
 mknod --mode=664 /dev/ppp c 108 0
</verbatim>

Add the following entries to __/etc/modules.conf__ according to __KERNEL-MODE-PPPOE__ (under your LinuxDistribution the file may already contain some or all of these):

<verbatim>
 alias net-pf-24 pppoe
 alias char-major-108 ppp_generic
 alias tty-ldisc-3 ppp_async
 alias tty-ldisc-13 n_hdlc
 alias tty-ldisc-14 ppp_synctty
</verbatim>

In the following, you would replace ''ISP'' with the PPPoE service name on your modem/AccessConcentrator, ''eth0'' with the ethernet device connected to your AccessConcentrator, ''foo@myisp.com'' with your username, ''myisp'' with a label for your ISP and ''mypassword'' with your password.

__/etc/ppp/peers/myisp__:
<verbatim>
 plugin rp-pppoe.so
 rp_pppoe_service ISP eth0
 holdoff 5
 #debug
 persist
 ipcp-accept-remote
 ipcp-accept-local
 noauth
 defaultroute
 hide-password
 user foo@myisp.com
 lcp-echo-interval 5
 lcp-echo-failure 5
 remotename myisp
 maxfail 0
</verbatim>

__/etc/ppp/pap-secrets__:
<verbatim>
 "foo@myisp.com"    myisp      "mypassword"
</verbatim>

Now, typing __pppd call myisp__ should connect the the AccessConcentrator then establish the [PPP] connection with the RemoteAccessNode (in the case of [ADSL]).
3 pages link to LinuxPPPoENotes:
Last edited on Wednesday, October 24, 2007 4:07:48 pm by "ChrisBrowning"
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