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Cisco 2821 PPPoE

При настройке PPPoE на 2821 выплыла проблема.
vpdn enable
request-dial in
protocol рррое
вот на этой строчке проблемы. Протокол  L2TP есть, а pppoe(как в примере выше) нет.
Что нужно, сменить прошивку, чтобы поддерживался pppoe?

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Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 15.1(3)T2
, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Wed 10-Aug-11 05:17 by prod_rel_team

ROM: System Bootstrap, Version 12.4(13r)T11, RELEASE SOFTWARE (fc1)

Alians uptime is 22 hours, 0 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-advipservicesk9-mz.151-3.T2.bin"
Last reload type: Normal Reload

 

Cisco 2821 (revision 53.51) with 512000K/12288K bytes of memory.
Processor board ID FTX1349AH5F
2 Gigabit Ethernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
253008K bytes of ATA CompactFlash (Read/Write)


License Info:

License UDI:

-------------------------------------------------
Device#   PID                   SN
-------------------------------------------------
*0        CISCO2821             FTX1349AH5F

 

Configuration register is 0x2102

 

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Кто-нибудь может объяснить почему такое происходит?

 Event[OPEN] State[Initial to Starting]
*Nov 30 08:52:09.888: Vi2 LCP: O CONFREQ [Starting] id 1 len 14
*Nov 30 08:52:09.888: Vi2 LCP:    AuthProto PAP (0x0304C023)
*Nov 30 08:52:09.888: Vi2 LCP:    MagicNumber 0x30A91E91 (0x050630A91E91)
*Nov 30 08:52:09.892: Vi2 LCP: Event[UP] State[Starting to REQsent]
*Nov 30 08:52:09.892: Vi2 LCP: I CONFREQ [REQsent] id 34 len 18
*Nov 30 08:52:09.892: Vi2 LCP:    MRU 1492 (0x010405D4)
*Nov 30 08:52:09.892: Vi2 LCP:    AuthProto PAP (0x0304C023)
*Nov 30 08:52:09.892: Vi2 LCP:    MagicNumber 0x573AF724 (0x0506573AF724)
*Nov 30 08:52:09.892: Vi2 LCP: O CONFNAK [REQsent] id 34 len 8
*Nov 30 08:52:09.892: Vi2 LCP:    MRU 1500 (0x010405DC)
*Nov 30 08:52:09.892: Vi2 LCP: Event[Receive ConfReq-] State[REQsent to REQsent]
*Nov 30 08:52:09.892: Vi2 LCP: I CONFREJ [REQsent] id 1 len 8
*Nov 30 08:52:09.892: Vi2 LCP:    AuthProto PAP (0x0304C023)

 

Сервер-клиент договариваются:

клиент - начинаю работать по PAP

сервер - работаю по PAP MTU 1492

клиент - я не могу работать по MTU 1500

сервер - я не могу работать по PAP

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пограничный роутер с провайдером. Клиент. Провайдер делает авторизацию только по PAP, еще и с инициативой со своей стороны (callin).

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