Allied Telesis Rapier Series Manuale di installazione e d'uso

C613-16074-00 REV B www.alliedtelesis.com

Introduction

This document describes how to set up PPPoE between a Linux client and an Allied Telesis

device.

What information you will find in this document

This document is divided into the following sections:

•Configuring your Allied Telesis Device‚ page 2

•Configuring Your Linux Device‚ page 3

•Starting the Link‚ page 4

•Debugging and Verifying‚ page 5

•Other Hints‚ page 6

Which products and software versions does this information apply to?

•Products:

Rapier, AT-8800, AT-8900, AT-9900, AT-9800 and SwitchBlade series switches

AR400 and AR700 series routers

•Software versions: 2.7.1 and later

Set Up PPPoE Between a Linux Client and an Allied Telesis

Access Concentrator

How To |

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 2

Configuring your Allied Telesis Device

Before starting, ensure that your PC has a version of rp-pppoe.

If rp-pppoe isn’t on your PC, do one of the following;

•Download it from http://www.roaringpenguin.com/penguin/open_source_rp-pppoe.php , then

compile and install it.

•Use the prepackaged installer, for example RPM or deb.

Network diagram

!Configure your Allied Telesis device as follows:

add user=linux_client pass=password

set user=linux_client telnet=no ipaddr=192.168.0.1

netmask=255.255.255.255

# PPP templates configuration

create ppp template=1

set ppp template=1 bap=off authentication=chap

# PPP configuration

add ppp acservice=test template=1 vlan=1

ena ppp accessconcentrator

# IP configuration

enable ip

add ip int=vlan1 ip=192.168.0.254

eth 1 port 1

Linux PC (client) Allied Telesis switch

(Access Concentrator)

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 3

Configuring Your Linux Device

1. Set a host name. The host name must be a user on the Allied Telesis device. To set a default

hostname on your linux device, use “hostname <newname>”:

2. Check the ppp options file. The options file is not used when this particular pppd link is started.

However, if it is used, it should look like this:

3. Check the CHAP secrets file. In this configuration there are a number of lines that are

commented out but only the last line is used. The last line of your CHAP secrets file should look

like this (as underlined in output below):

!Configure your Linux device as follows:

[root@linux_client michael]# hostname

linux_client

[root@linux_client michael]# cat /etc/ppp/options

lock

#debug

#novj

#require-pap

[root@linux_client michael]# cat /etc/ppp/chap-secrets

# Secrets for authentication using CHAP

# client server secret IP addresses

#* test password *

#tester * 12345678 1.1.1.1

#* * eightbit *

#eightbit * eightbit 1.1.1.2

#manager pptpd friend *

linux_client * password *

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 4

Starting the Link

pppoe is actually another PPP daemon and we tell it to start pppoe discovery out eth1. The “pty”

part makes pppd converse via a pseudo terminal, otherwise all the PPP output goes to the screen

and hence the link will not come up.

!To configure your linux device, start the pppd (PPP daemon) process and tell it to start

pppoe:

[root@linux_client michael]# pppd pty 'pppoe -I eth1'

Loading PPP modules for linux kernel 2.4: [ OK ]

[root@linux_client michael]# ping 192.168.0.254

PING 192.168.0.254 (192.168.0.254) from 192.168.0.1 : 56(84) bytes of

data.

64 bytes from 192.168.0.254: icmp_seq=0 ttl=64 time=357 usec

64 bytes from 192.168.0.254: icmp_seq=1 ttl=64 time=266 usec

64 bytes from 192.168.0.254: icmp_seq=2 ttl=64 time=256 usec

--- 192.168.0.254 ping statistics ---

3 packets transmitted, 3 packets received, 0% packet loss

round-trip min/avg/max/mdev = 0.256/0.293/0.357/0.045 ms

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 5

Debugging and Verifying

Apart from PING, you can also check the following on your linux PC:

On your Allied Telesis device, you can check the following:

[root@linux_client michael]# ifconfig

ppp0 Link encap:Point-to-Point Protocol

inet addr:192.168.0.1 P-t-P:192.168.0.254 Mask:255.255.255.255

UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1

RX packets:7 errors:0 dropped:0 overruns:0 frame:0

TX packets:8 errors:0 dropped:0 overruns:0 carrier:0

collisions:0

[root@linux_client michael]# ps ax | grep ppp

4747 ? S 0:00 /usr/sbin/pppd pty pppoe -I eth1

4748 ? S 0:00 pppoe -I eth1

4769 pts/0 R 0:00 grep ppp

[root@linux_client michael]# pppstats

IN PACK VJCOMP VJUNC VJERR | OUT PACK VJCOMP VJUNC NON-VJ

310 7 0 0 0 | 322 8 0 0 8

ena ppp templ=1 debug=decode

ena ppp templ=1 debug=all

show ppp

show ppp pppoe

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 6

Other Hints

Here are some extra bits and pieces worthy of note.

The linux PPPoE Daemon

You can get PPPoE to display all the Access Concentrators who answer the PPPoE Active Discovery

Initiation:

If you get more than one PPPoE Active Discovery Offer, you can take that information and manually

select which Access Concentrator you want to respond to. For example:

You can always see other PPPoE options by consulting the manual:

[root@linux_client michael]# pppoe -I eth1 -A

--------------------------------------------------

Service-Name: test

Got a cookie: 00 00 33 2f

Access-Concentrator: -58245394

AC-Ethernet-Address: 00:00:cd:05:01:ff

--------------------------------------------------

[root@linux_client michael]# pppd pty 'pppoe -I eth1 -C -58245394'

[root@linux_client michael]# man pppoe

Set Up PPPoE Between a Linux Client and an Allied Telesis Access Concentrator 7

Multiple calls

1. Alter the configuration of the Allied Telesis device:

2. Configure the linux device:

The “idle 30” means that after 30 seconds, if no traffic goes over a ppp interface, that interface

is brought down.

3. Initiate the connection:

If you want to initiate more than one connection, simply repeat the above command, but

change the call name (as underlined).

!To make multiple calls to the Access Concentrator:

add user=tester1 password=password

set user=tester1 ipaddress=192.168.0.2 netmask=255.255.255.255

add user=tester2 password=password

set user=tester2 ipaddress=192.168.0.3 netmask=255.255.255.255

add user=tester3 password=password

set user=tester3 ipaddress=192.168.0.4 netmask=255.255.255.255

set ppp acservice=test maxsessions=3

[root@linux_client michael]# ls -l /etc/ppp/peers/

total 12

-rw-r--r-- 1 root root 21 Aug 10 08:48 tester1

-rw-r--r-- 1 root root 21 Aug 10 08:51 tester2

-rw-r--r-- 1 root root 21 Aug 10 08:51 tester3

[root@linux_client michael]# cat /etc/ppp/peers/tester1

name tester1

idle 30

[root@linux_client michael]# cat /etc/ppp/peers/tester2

name tester2

idle 30

[root@linux_client michael]# cat /etc/ppp/peers/tester3

name tester3

idle 30

[root@linux_client michael]# pppd pty 'pppoe -I eth1 -U' call tester1

USA Headquarters |19800 North Creek Parkway |Suite 200 |Bothell |WA 98011 |USA |T: +1 800 424 4284 |F: +1 425 481 3895

Asia-Pacific Headquarters |11 Tai Seng Link |Singapore |534182 |T: +65 6383 3832 |F: +65 6383 3830

www.alliedtelesis.com

© 2006 Allied Telesyn Inc. All rights reserved. Information in this document is subject to change without notice. All company names, logos, and product designs that are trademarks or registered trademarks are the property of their respective owners.

C613-16074-00 REV B

More about idle times

In the previous section we set an idle timeout on PPP, on the Linux device This means that after

30 seconds of idle time PPP will send a Link Control Protocol (LCP) message with a Termination

Request. The Allied Telesis device responds with a Termination Ack. PPPoE then takes over and

both devices finish the connection with a PADT frame.

In Linux, you can set a PPPoE idle timeout. This means that PPPoE will go straight to sending a

PADT and PPP itself will not get the opportunity to send an LCP Termination Request. Allied

Telesis devices will ignore a PADT frame if it is not preempted by an LCP Termination Request,

so nothing will happen on the Allied Telesis device when pppoe takes down the connection on

the Linux device.

To set a PPPoE idle timeout (30 seconds in this example):

Compression

The Van Jacobson style TCP/IP header (VJ) compression is now standard on PPP links . It is

supported in both Allied Telesis and Linux PPP.

To turn on VJ compression on the Allied Telesis device:

VJ compression should be on your linux device by default. However, check the PPP options file

to ensure that the VJ compression has not been disabled.

[root@linux_client michael]# pppd pty 'pppoe -I eth1 –U –T 30'

set ppp template=1 vjc=on

[root@linux_client michael]# cat /etc/ppp/options

lock

noauth

noipdefault

usepeerdns

# Comment out or delete the following line if it exists

#novj

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