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	Enable Asynchronous Transfer Mode protocol support
gtk	Installs GTK+ password prompting program that can be used by passprompt.so PPP plugin for reading the password from a X11 input terminal
pam	Add support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip
selinux	!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
systemd	Enable use of systemd-specific libraries and features like socket activation or session tracking

Data provided by the Gentoo Package Database · Last update: 2024-10-19 16:26 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

See also

• Gentoo handbook PPPoE configuration