PPP: Difference between revisions

Latest revision as of 21:53, 10 May 2023

Installation

PPP (Point-to-Point Protocol) allows multiple transports, eg. PPPoE is PPP over Ethernet.

PPPoE

apk add ppp-pppoe

Configure PPP

PPP peer file

Such file is usually located as /etc/ppp/peers/<isp>. See pppd(8) for all possible options.

PPPoE

This example peer file is based on Debian's peers-pppoe extra file. See that pppoe.so plugin as eth0 as device defined.

user "myusername@realm"
plugin pppoe.so eth0
noipdefault
usepeerdns
defaultroute
persist
noauth

Note that if you have a version of ppp older than 2.4.9, the pppoe.so plugin is named rp-pppoe.so.

Authentication

CHAP authentication is most used one but there are other ones, see pppd(8).

/etc/ppp/chap-secrets

# Secrets for authentication using CHAP
# client	server	secret			IP addresses
"myusername@realm"	        *	"<your password>"

Kernel modules

PPPoE

pppoe must be present in /etc/modules when using PPPoE.

ifupdown-ng intergration

To use /etc/network/interfaces with a ppp defintion automatically, ifupdown-ng-ppp package must be installed.

apk add ifupdown-ng-ppp

Example for PPP configuration in /etc/network/interfaces, see interfaces-ppp(5) for more info.

auto eth0
iface eth0 up

auto ppp0
iface ppp0
	ppp-provider isp

Tips

pppoeconf

Debian created pppoeconf tool which helps configuring PPPoE. First some utils have to be installed.

apk add ppp-pppoe newt gettext sed

wget https://sources.debian.org/data/main/p/pppoeconf/1.21%2Bnmu2/pppoeconf

chmod +x ./pppoeconf && ./pppoeconf

@@ Line 1: / Line 1: @@
-= Configuring PPP =
+{{TOC right}}
-Next up we need to configure our router to be able to dial a PPP connection with our modem.
+== Installation ==
+PPP (Point-to-Point Protocol) allows multiple transports, eg. PPPoE is PPP over Ethernet.
+=== PPPoE ===
 {{cmd|apk add ppp-pppoe}}
-Check that the interface between your router and modem is eth1, or change it. Enter your credentials at the bottom of the file or use /etc/ppp/chap-secrets
+== Configure PPP ==
-== /etc/ppp/peers/yourISP ==
+=== PPP peer file ===
-<pre>#
-# PPP Configuration file
-#
-nolog
+Such file is usually located as ''/etc/ppp/peers/<isp>''. See [https://ppp.samba.org/pppd.html pppd(8)] for all possible options.
-# Try to get the IP address from the ISP
+==== PPPoE ====
+This example peer file is based on Debian's [https://salsa.debian.org/debian/ppp/-/raw/master/debian/extra/peers-pppoe peers-pppoe] extra file. See that ''pppoe.so'' plugin as ''eth0'' as device defined.
+<pre>
+user "myusername@realm"
+plugin pppoe.so eth0
 noipdefault
+usepeerdns
+defaultroute
+persist
+noauth
+</pre>
-# Try to get the name server addresses from the ISP
+Note that if you have a version of ppp older than 2.4.9, the <code>pppoe.so</code> plugin is named <code>rp-pppoe.so</code>.
-usepeerdns
-# Use this connection as the default route.
+=== Authentication ===
-defaultroute
-defaultroute-metric 300
-# detatch after ppp0 interface is created
+CHAP authentication is most used one but there are other ones, see [https://ppp.samba.org/pppd.html pppd(8)].
-updetach
-# Replace previous default route
+==== ''/etc/ppp/chap-secrets'' ====
-# This requires a special patch to ppp
-# https://sources.debian.net/src/ppp/2.4.7-1%2B1~exp1/debian/patches/cifdefroute.dif/
-# replacedefaultroute
-# rp-pppoe plug-in makes PPPoE connection so rp-pppoe package is not needed
+<pre>
-# Possibly, you may need to change interface according your configuration
+# Secrets for authentication using CHAP
-plugin rp-pppoe.so eth1
+# client	server	secret			IP addresses
+"myusername@realm"	        *	"<your password>"
+</pre>
-# Uncomment if you need on-demand connection
+== Kernel modules ==
-#demand
-# Disconnect after 300 seconds (5 minutes) of idle time.
+=== PPPoE ===
-#idle 300
-# Hide password from log entries
+''pppoe'' must be present in ''/etc/modules'' when using PPPoE.
-hide-password
-# Send echo requests
+== ''ifupdown-ng'' intergration ==
-lcp-echo-interval 20
-lcp-echo-failure 3
-# Do not authenticate ISP peer
+To use ''/etc/network/interfaces'' with a ppp defintion automatically, ''ifupdown-ng-ppp'' package must be installed.
-noauth
-# Control connection consistency
+{{cmd|apk add ifupdown-ng-ppp}}
-persist
-maxfail 0
-# Control MTU size if your ISP does not force it
+Example for PPP configuration in ''/etc/network/interfaces'', see [https://github.com/ifupdown-ng/ifupdown-ng/blob/master/doc/interfaces-ppp.scd interfaces-ppp(5)] for more info.
-#mtu 1492
-user "username@yourISP.tld"
+<pre>
+auto eth0
+iface eth0 up
-# Compression
+auto ppp0
-bsdcomp 15
+iface ppp0
-deflate 15</pre>
+	ppp-provider isp
+</pre>
-== /etc/ppp/chap-secrets ==
+== Tips ==
-Enter in your login credentials
-<pre># Secrets for authentication using CHAP
+=== pppoeconf ===
-# client			server	secret			IP addresses
-"username@yourISP.tld"	        *	"<your password>"</pre>
-== /etc/modules ==
+Debian created ''[https://sources.debian.org/data/main/p/pppoeconf/1.21%2Bnmu2/pppoeconf pppoeconf]'' tool which helps configuring PPPoE. First some utils have to be installed.
-Update modules to include pppoe:
-<pre>pppoe</pre>
-===  IPv6 ===
+{{cmd|apk add ppp-pppoe newt gettext sed}}
-Add this to your ppp configuration. This tells PPP to get an ipv6 address. Note the comma is needed.
+{{cmd|wget https://sources.debian.org/data/main/p/pppoeconf/1.21%2Bnmu2/pppoeconf}}
+{{cmd|chmod +x ./pppoeconf && ./pppoeconf}}
-<pre># Enable IPV6
+[[Category:Networking]]
-+ipv6 ipv6cp-use-ipaddr
-ipv6 ,</pre>