PPP
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/) |
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 |
Portage has a USE flag ppp
for enabling support for PPP for other packages.
/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.
Using PPP compression is not suggested.
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)
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:
/etc/conf.d/net
Add:... 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
file: /etc/ppp/peers/provider
plugin pppoe.so
# network interface
enp41s0
# login name
name "you_login_to_ISP"
usepeerdns
persist
# Uncomment this if you want to enable dial on demand
#demand
#idle 180
defaultroute
defaultroute-metric 1023
hide-password
noauth
#linkname eth0
ifname eth0
enp41s0 is a network interface card to use, it can be found with "ip link" oir "ip address" command
note: if you use ppp of version less than 2.4.9 first line should be (rp- prefix):
plugin rp-pppoe.so
file /etc/ppp/chap-secrets:
# Secrets for authentication using CHAP
# client server secret IP addresses
your_login_to_ISP * your_secret_password
now we want this at startup:
add the following scripts in /etc/systemd/system/pppoe.service
[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
here: sys-subsystem-net-devices-enp41s0.device is a network device via which practically pppoe will work. to find out the exact name you can use the following bash command
systemctl list-units | grep device | grep net
now we are almost here, but the interface will die if computer goes to sleep. On wake-up you should to reconnect. So create
/etc/systemd/system/pppoe-after-wakeup.service file:
[Install]
WantedBy=sleep.target
[Unit]
After=systemd-suspend.service systemd-hybrid-sleep.service systemd-hibernate.service
[Service]
Type=simple
ExecStart=/bin/systemctl restart pppoe
we are ready. Test it with
sudo systemctl start pppoe
sudo systemctl start pppoe-after-wakeup
commands and if it works as expected you can enable them on a permanent basis:
sudo systemctl enable pppoe
sudo systemctl enable pppoe-after-wakeup