[isp-bgp] OT slightly... Cisco 871 issues with VPN's and PPTP

[KingBloom <lists@...>]

Please excuse this OT post, but there are many technical people on  
this list that seem to have more of a clue than something like ISP- 
tech and may have an idea of what is going on here.

We've got a Cisco 871 router in use behind a Cisco 2800 which is  
providing a managed connect from ATT for a customer of ours.  The 871  
is in use, because ATT "managed" service means, we do nothing without  
$500 a pop payments..

That said, we needed to be able to NAT the customers VLAN/network  
both public and private IP's.    After setting this up, users  
complained that VPN's (cisco based VPN clients) ceased to function.   
Well, actually they would connect, but could only hold a connection  
for around 30-40 seconds.

After a long trouble shooting phase we found that Cisco Express  
Forwarding was the culprit.  Turning it off fixed the VPN issues, and  
we were able to maintain stable VPN connections using the Cisco VPN  
Client.

However, we have issues that still exist with users using the Windows  
VPN client, ie., those using PPTP, instead of a an IPSEC tunnel,  
which does work after turning off CEF.

Is anyone aware of any issues with a Cisco 871 doing NAT having  
problems with VPN/PPTP connections?  Is there a bug in the IOS we are  
not aware of?  I am completely lost.

Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version  
12.4(4)T7, RELEASE SOFTWARE (fc1)

I have a sh run of the current config if someone has any ideas and or  
would like to see it.

Thank you for any help you can provide me.

Regards,
Bob Costas
PR Director KingBloom.Com
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