Bring pppd up after reboot

Step 1: Fill in the password and username

Change *-secrets file in/etc/ppp,usually you need to modify 2 files:

$ cd /etc/ppp/
$ sudo vi chap-secrets 
$ sudo vi pap-secrets

Replace the USERNAME and PASSWORD in *-secrets assigned by your ISP.

# Secrets for authentication using CHAP/PAP
# client        server  secret      IP addresses
"USERNAME"   *       "PASSWORD"        *

Step 2: Create a peer file

Create a Peer file that contains the settings for connecting to your ISP.

$ cd /etc/ppp/peers

# This file can be named whatever you want.We name it test_a for example 
$ sudo vi test_a

Then edit/save /etc/ppp/peers/test_a to look like this:

user "USERNAME"
noipdefault
usepeerdns
defaultroute
replacedefaultrout
persist
noauth
plugin rp-pppoe.so eth0
hide-password

Step 3: Modify /etc/network/interfaces

If you want pppd to start automatically after reboot, you can just simply change interfaces to look like this:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet ppp
       pre-up /sbin/ip link set dev eth0 up
       provider test_a
       post-down /sbin/ip link set dev eth0 down

Step 4: Reboot

$ sudo reboot

Verification

1. Get the IP.

   open the terminal with Ctrl+Alt+T and tap the command below:

   $ ifconfig
   

   you will see a interface named ppp0.
   

2. Check ip route

   $ ip route
   default dev ppp0 scope link
   

3. Resolve domain

   $ nslookup DOMAIN
   

4. Visit website

   $ curl DOMAIN