Cisco 2600 - What IOS for VPDN and PPPoE?

I am trying to connect to my new ISP using a Cisco 2600 series router and PPPoE.  I am following these instructions:

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_configuration_example09186a0080126dc0.shtml

The tutorial begins:

vpdn enable
no vpdn logging
!
vpdn-group 1
request-dialin
protocol pppoe

I have tried several IOS versions and none of them will let me use the commands "vpdn enable" AND "protocol PPPoE".  To be honest, I don't know if I am doing something wrong or if I need a different IOS.  Only one of the IOS versions I have tried allowed "vpdn enable" command.

The router is currently configured to route from my main work network (outside) to a test network (inside) and it works just fine.
ctarbetAsked:
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donmanrobbConnect With a Mentor Commented:
You can use the Cisco IOS Selector tool to find what features are in what IOS:
http://tools.cisco.com/ITDIT/ISTMAIN/servlet/index

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ctarbetAuthor Commented:
I can't believe I didn't find that selector in all my surfing around. ::rolleyes::  Thanks.

I am confused about why these features appear and disappear seemingly at random.  What are the chances that the 6 or so IOS versions I tried would just happen to be the versions that don't support the features I need?

Sounds like another case of Cisco doing whatever they want because they are the HNIC.  Bah.
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