PPP

Resources
Wikipedia

PPP (Point-to-Point Protocol) is commonly used in establishing a direct connection between two networking nodes. It can provide connection authentication, transmission encryption, and compression.

Installation

USE flags for net-dialup/ppp Point-to-Point Protocol (PPP)

activefilter Enables active filter support
atm Enables ATM (Asynchronous Transfer Mode) protocol support
dhcp Installs PPP DHCP client plugin for IP address allocation by a DHCP server (see http://www.netservers.co.uk/gpl/)
eap-tls Enables support for Extensible Authentication Protocol and Transport Level Security (see http://www.nikhef.nl/~janjust/ppp/index.html)
gtk Installs GTK+ password prompting program that can be used by passprompt.so PPP plugin for reading the password from a X11 input terminal
ipv6 Enables support for IP version 6
libressl Use dev-libs/libressl instead of dev-libs/openssl when applicable (see also the ssl useflag)
pam Add support for PAM (Pluggable Authentication Modules)DANGEROUS to arbitrarily flip
radius Enables RADIUS support
Data provided by the Gentoo Package Database ยท Last update: 2021-02-26 16:53 More information about USE flags

Portage has a USE flag ppp for enabling support for PPP for other packages.

Note
Enabling ppp USE flag will pull in net-dialup/ppp automatically
FILE /etc/portage/make.conf
USE="... ppp ..."

After setting global USE flags update your system to the changes take effect:

root #emerge --ask --changed-use --deep @world

Or emerge net-dialup/ppp package manually:

root #emerge --ask net-dialup/ppp

Kernel

Following kernel options need to be enabled, to support PPPoE, which is used in most cases.

Note
Using PPP compression is not suggested.
KERNEL 
Device Drivers  --->
    [*] Network device support  --->
      <*>   PPP (point-to-point protocol) support
      < >     PPP BSD-Compress compression (NEW)
      < >     PPP Deflate compression (NEW)
      [ ]     PPP filtering (NEW)
      < >     PPP MPPE compression (encryption) (EXPERIMENTAL) (NEW)
      [ ]     PPP multilink support (EXPERIMENTAL) (NEW)
      <*>     PPP over Ethernet (EXPERIMENTAL)
      < >     PPP support for async serial ports (NEW)
      < >     PPP support for sync tty ports (NEW)
Optional PPP options
Option Driver Description
PPP BSD-Compress compression ppp_bsdcomp (Not recommended) Support for data compression. "PPP Deflate compression" is preferable.
PPP filtering - Support for packet filtering.
PPP MPPE compression (encryption) ppp_mppe Driver for Microsoft Point-to-Point Encryption.
PPP multilink support - Support for PPP multilink to combine serveral lines.
PPP over Ethernet pppoe Driver for PPPoE.
PPP support for sync tty ports ppp_sync_tty Support for synchronous devices.

Finally you need to rebuild linux, install and boot new kernel with PPP support.

Configuration

Provided eth0 following lines should be added for PPPoE connection:

FILE /etc/conf.d/netAdd:
...
config_ppp0="ppp"
link_ppp0="eth0" (Specify your ethernet interface)
plugins_ppp0="pppoe"
username_ppp0='user'
password_ppp0='password'
pppd_ppp0="
noauth
defaultroute
usepeerdns
mtu 9120 (Get the correct MTU (Jumbo frame) value from your eth0 Gigabit Ethernet card interface)
holdoff 3
child-timeout 60
lcp-echo-interval 15
lcp-echo-failure 3
noaccomp noccp nobsdcomp nodeflate nopcomp novj novjccomp"
...
rc_net_ppp0_need="net.eth0"

Create an init script for the PPP device by symlinking to net.lo:

root #ln -s /etc/init.d/net.lo /etc/init.d/net.ppp0
root #/etc/init.d/net.ppp0 start

Example setup with systemd and automatic connection

First, create the configuration file:

FILE /etc/ppp/peers/provider
<syntaxhighlight lang="cfg">plugin pppoe.so
# network interface
enp41s0
# login name
name "you_login_to_ISP"
usepeerdns
persist
# Uncomment this to enable dial on demand
#demand
#idle 180
defaultroute
defaultroute-metric 1023
hide-password
noauth
#linkname eth0
ifname eth0</syntaxhighlight>

enp41s0 is the network interface card to use. It can be found with ip link command.

Note
When using ppp of version less than 2.4.9, the first line should be (rp- prefix):
plugin rp-pppoe.so

Next, create the password secrets file:

FILE /etc/ppp/chap-secrets
<syntaxhighlight lang="cfg"># Secrets for authentication using CHAP
# client        server  secret                  IP addresses
your_login_to_ISP   *       your_secret_password</syntaxhighlight>

For this to work at system startup, add the following unit in /etc/systemd/system/pppoe.service:

FILE /etc/systemd/system/pppoe.service
<syntaxhighlight lang="ini">[Unit]
Description=PPPoE connection
BindsTo=sys-subsystem-net-devices-enp41s0.device
After=sys-subsystem-net-devices-enp41s0.device
 
[Service]
Type=forking
PIDFile=/var/run/eth0.pid
#RemainAfterExit=true
ExecStart=/usr/sbin/pon
ExecStop=/usr/sbin/poff provider
 
[Install]
WantedBy=multi-user.target</syntaxhighlight>


sys-subsystem-net-devices-enp41s0.device is the network device via which pppoe will connect on. To find out the exact name you can use the following bash command

root #systemctl list-units | grep device | grep net

Optionally, create a service unit to handle wake up after sleep:

FILE /etc/systemd/system/pppoe-after-wakeup.service
<syntaxhighlight lang="ini">[Install]
WantedBy=sleep.target
 
[Unit]
After=systemd-suspend.service systemd-hybrid-sleep.service systemd-hibernate.service
 
[Service]
Type=simple
ExecStart=/bin/systemctl restart pppoe</syntaxhighlight>


Finally, test it with:

root #systemctl start pppoe
root #systemctl start pppoe-after-wakeup

If it works as expected, enable them on a permanent basis:

root #systemctl enable pppoe
root #systemctl enable pppoe-after-wakeup

See also

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