linuxマシンのルータ化その2　pppoeでの接続 - ひよっこエンジニアの日記

前回でLinuxマシンにUSB経由でNICの増設を行いました。今回は、実際にPPPOE経由でインターネットに接続できることを確認します。

Step1　rp-pppoeのインストール

rp-pppoeパッケージにて、PPPOEの接続を行います。そのため、rp-pppoeのインストールを行います。

# yum install rp-pppoe

無事にインストールされました。

[root@new-host ~]# yum list |grep pppoe
rp-pppoe.i686                              3.10-8.el6                  @base

Step2　rp-pppoeの設定

　CentOSの5系ならばpppoe-setupコマンドで対話的に設定を行うようですが、CentOSの6系ではファイルの編集で設定します。まず設定ファイルをコピーします。

# cp /usr/share/doc/rp-pppoe-3.10/configs/pppoe.conf /etc/ppp/

　UNIと接続するNICがeth3で、PPPOEの接続に用いるユーザIDはhoge@plala.or.jpです。
それらを設定ファイルである/etc/ppp/pppoe.confのETHとUSERの行に追加します。それ以外は帰る必要はないようです。

#***********************************************************************
#
# pppoe.conf
#
# Configuration file for rp-pppoe.  Edit as appropriate and install in
# /etc/ppp/pppoe.conf
#
# NOTE: This file is used by the pppoe-start, pppoe-stop, pppoe-connect and
#       pppoe-status shell scripts.  It is *not* used in any way by the
#       "pppoe" executable.
#
# Copyright (C) 2000 Roaring Penguin Software Inc.
#
# This file may be distributed under the terms of the GNU General
# Public License.
#
# LIC: GPL
# $Id$
#***********************************************************************

# When you configure a variable, DO NOT leave spaces around the "=" sign.

# Ethernet card connected to DSL modem
ETH=eth3

# PPPoE user name.  You may have to supply "@provider.com"  Sympatico
# users in Canada do need to include "@sympatico.ca"
# Sympatico uses PAP authentication.  Make sure /etc/ppp/pap-secrets
# contains the right username/password combination.
# For Magma, use xxyyzz@magma.ca
USER=hoge@plala.or.jp

# Bring link up on demand?  Default is to leave link up all the time.
# If you want the link to come up on demand, set DEMAND to a number indicating
# the idle time after which the link is brought down.
DEMAND=no
#DEMAND=300

# DNS type: SERVER=obtain from server; SPECIFY=use DNS1 and DNS2;
# NOCHANGE=do not adjust.
DNSTYPE=server

# Obtain DNS server addresses from the peer (recent versions of pppd only)
# In old config files, this used to be called USEPEERDNS.  Changed to
# PEERDNS for better Red Hat compatibility
PEERDNS=yes

DNS1=
DNS2=

# Make the PPPoE connection your default route.  Set to
# DEFAULTROUTE=no if you don't want this.
DEFAULTROUTE=yes

### ONLY TOUCH THE FOLLOWING SETTINGS IF YOU'RE AN EXPERT

# How long pppoe-start waits for a new PPP interface to appear before
# concluding something went wrong.  If you use 0, then pppoe-start
# exits immediately with a successful status and does not wait for the
# link to come up.  Time is in seconds.
#
# WARNING WARNING WARNING:
#
# If you are using rp-pppoe on a physically-inaccessible host, set
# CONNECT_TIMEOUT to 0.  This makes SURE that the machine keeps trying
# to connect forever after pppoe-start is called.  Otherwise, it will
# give out after CONNECT_TIMEOUT seconds and will not attempt to
# connect again, making it impossible to reach.
CONNECT_TIMEOUT=30

# How often in seconds pppoe-start polls to check if link is up
CONNECT_POLL=2

# Specific desired AC Name
ACNAME=

# Specific desired service name
SERVICENAME=

# Character to echo at each poll.  Use PING="" if you don't want
# anything echoed
PING="."

# File where the pppoe-connect script writes its process-ID.
# Three files are actually used:
#   $PIDFILE       contains PID of pppoe-connect script
#   $PIDFILE.pppoe contains PID of pppoe process
#   $PIDFILE.pppd  contains PID of pppd process
CF_BASE=`basename $CONFIG`
PIDFILE="/var/run/$CF_BASE-pppoe.pid"

# Do you want to use synchronous PPP?  "yes" or "no".  "yes" is much
# easier on CPU usage, but may not work for you.  It is safer to use
# "no", but you may want to experiment with "yes".  "yes" is generally
# safe on Linux machines with the n_hdlc line discipline; unsafe on others.
SYNCHRONOUS=no

# Do you want to clamp the MSS?  Here's how to decide:
# - If you have only a SINGLE computer connected to the DSL modem, choose
#   "no".
# - If you have a computer acting as a gateway for a LAN, choose "1412".
#   The setting of 1412 is safe for either setup, but uses slightly more
#   CPU power.
CLAMPMSS=1412
#CLAMPMSS=no

# LCP echo interval and failure count.
LCP_INTERVAL=20
LCP_FAILURE=3

# PPPOE_TIMEOUT should be about 4*LCP_INTERVAL
PPPOE_TIMEOUT=80

# Firewalling: One of NONE, STANDALONE or MASQUERADE
FIREWALL=NONE

# Linux kernel-mode plugin for pppd.  If you want to try the kernel-mode
# plugin, use LINUX_PLUGIN=/etc/ppp/plugins/rp-pppoe.so
LINUX_PLUGIN=

# Any extra arguments to pass to pppoe.  Normally, use a blank string
# like this:
PPPOE_EXTRA=""

# Rumour has it that "Citizen's Communications" with a 3Com
# HomeConnect DSL Modem DualLink requires these extra options:
# PPPOE_EXTRA="-f 3c12:3c13 -S ISP"

# Any extra arguments to pass to pppd.  Normally, use a blank string
# like this:
PPPD_EXTRA=""


########## DON'T CHANGE BELOW UNLESS YOU KNOW WHAT YOU ARE DOING
# If you wish to COMPLETELY overrride the pppd invocation:
# Example:
# OVERRIDE_PPPD_COMMAND="pppd call dsl"

# If you want pppoe-connect to exit when connection drops:
# RETRY_ON_FAILURE=no

/etc/ppp/chap-secretsにユーザIDとパスワード(ここではhogehoge)を以下のように記載します。

# Secrets for authentication using CHAP
# client        server  secret                  IP addresses
#"root" *       "tuey2wzh7vkfr"
"hoge@plala.or.jp" *       "hogehoge"

/etc/resolv.confにISPから指定されたDNSサーバを書き込んだ状態で、以下のコマンドを実行します。

#pppoe-start

Step3 PPPOE接続完了

ifconfigコマンドでppp0というインタフェースが表示され無事にpppoeの接続完了です。

ppp0      Link encap:Point-to-Point Protocol
          inet addr:XXX.XXX.XXX.XXX  P-t-P:XXX.XXX.XXX.XXX  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1454  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:54 (54.0 b)  TX bytes:54 (54.0 b)

/var/log/messagesには以下のように出力されます。

Apr  1 23:42:35 new-host pppd[3363]: pppd 2.4.5 started by root, uid 0
Apr  1 23:42:35 new-host pppd[3363]: Using interface ppp0
Apr  1 23:42:35 new-host pppd[3363]: Connect: ppp0 <--> /dev/pts/1
Apr  1 23:42:35 new-host pppoe[3364]: PPP session is 6646 (0x19f6)
Apr  1 23:42:37 new-host pppd[3363]: CHAP authentication succeeded
Apr  1 23:42:37 new-host pppd[3363]: CHAP authentication succeeded
Apr  1 23:42:37 new-host pppd[3363]: local  IP address XXX.XXX.XXX.XXX
Apr  1 23:42:37 new-host pppd[3363]: remote IP address XXX.XXX.XXX.XXX
Apr  1 23:42:37 new-host pppd[3363]: primary   DNS address XXX.XXX.XXX.XXX
Apr  1 23:42:37 new-host pppd[3363]: secondary DNS address XXX.XXX.XXX.XXX

Step4 動作確認

DNSの設定をしていないので、このままではアドレス解決できません。そこでIPアドレスを用いてgoogleのDNSにpingを打ってインターネットとの接続確認を行います。無事に届いているので、正しく動作しています。

[root@localhost ~]# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=53 time=11.6 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=53 time=6.76 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=53 time=6.83 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=53 time=7.84 ms

Step1 rp-pppoeのインストール

Step2 rp-pppoeの設定

Step3 PPPOE接続完了

Step4 動作確認

Step1　rp-pppoeのインストール

Step2　rp-pppoeの設定