[Tips] Ubuntu下PPPoE安裝設定

速記一下Ubuntu的PPPoE設定...

查詢有關PPPoE的package

$ sudo apt-cache search pppoe

pppoeconf - configures PPPoE/ADSL connections
pppoe - PPP over Ethernet driver
pppstatus - console-based PPP status monitor

安裝

$ sudo apt-get install pppoeconf pppoe pppstatus

設定

$ sudo pppoeconf

根據問題回答yes/no,並且設定帳號密碼,設定完成後將自動連線

中斷

$ sudo poff

若超過一個連線

$ sudo poff -a

重新建立連線

$ sudo pon dsl-provider

查詢log

$ sudo plog

預設撥接設定儲存位置,會override /etc/ppp/options

$ sudo vim /etc/ppp/peers/dsl-provider

lcp-echo-interval 30      # interval of sending request to adsl server
lcp-echo-failure 10       # times of retry if sending request fail
# Override any connect script that may have been set in /etc/ppp/options.
persist                   # auto dial-up if lost connection 
user "user@isp.net"       # dial-up user account

若是使用PAP驗證,則帳號密碼會儲存於

$ sudo vim /etc/ppp/pap-secrets

"user@isp.net" * "passowrd"

PPPoE斷線問題檢測先從查詢plog開始,若出現以下訊息表示超出嘗試次數還未能連接上

pppd[1624]: Timeout waiting for PADO packets

解決方法就是定時檢查連線狀態,若沒有連線則持續撥號,常用的檢查方法有ifconfig或是running process,簡單寫一下重新撥號的script

#!/bin/bash
# auto dial-up 

# check ifconfig or check running process
RETRY=5
PPP=`ifconfig|grep -in ppp`
until [ $RETRY -le 0 ] || [ -n "$PPP" ] || [ -e /var/run/ppp0.pid ]
do pon dsl-provider
  sleep 30
  PPP=`ifconfig|grep -in ppp`
  ((RETRY=RETRY-1))
done

reference:
* 使用 PPPoEConf 連接 Internet
* Linux PPP HOWTO