Cisco Router 881 VPN with Vodafone 3G Card

Hi experts,
we have setup an Cisco 881 an it works fine. Our problem is, if you try to build up a vpn-connection with a vodafone 3g card, the vpn-connection is established but you cannot ping our local network. I think it must be a problem with ipsec over UDP because Vodafone is doing IPSec over an adress translation. Has anyone solved the problem?
it-solutionsAsked:
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it-solutionsConnect With a Mentor Author Commented:
Hello @All:

The problem is fixed!!!

It is caused by NDIS6.2 interface for WWAN, in this case Windows 7 32-bit  OS and Cisco VPN-Client 5.0. You will find the fix at: http://www.citrix.com/lang/English/lp/lp_1680845.asp

Thank you for quick and kindly support.

Best Regards

it-solutions
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Istvan KalmarHead of IT Security Division Commented:
Hi,

In this case you need to enable NAT-T on vpn concentrator!

Best regards,
Istvan
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Rick_at_ptscintiCommented:
just to be clear....you are trying to connect to the 881 remotely via the Cisco VPN client using a cellular connection on the host PC?
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it-solutionsAuthor Commented:
Hi, Thank you for your quick answers..

@Rick_at_ptscinti:
Yes, thats´s the case. If we connect whithout using the 3G-network it works fine.

@ikalmar:

Do you have a workaround to enable NAT-T on Cisco 881?
Isakmp nat-traversal 20 isn´t a valid command for this router.

Best regards,

it-solutions
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Istvan KalmarHead of IT Security Division Commented:
try it:

crypto ipsec nat-transparency udp-encapsulation

But in this case you need to enable it on the central SITE!

Best regards,
Istvan
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it-solutionsAuthor Commented:
What do you mean with "need to enable it on the central site"?
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Istvan KalmarHead of IT Security Division Commented:
ahh the central sit is the 881?
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it-solutionsAuthor Commented:
Yes, the central site is the 881, and we try to buildup a vpn-connection over vodafone 3g with Cisco VPN-Client 5.x.
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Istvan KalmarHead of IT Security Division Commented:
ok...

in this case you need to enable nat-t:
crypto ipsec nat-transparency udp-encapsulation
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Istvan KalmarHead of IT Security Division Commented:
but some ios it is defaultly enabled...

what shows the log on the router?
did you tried to debug?
deb cry isa
deb cry ips
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it-solutionsAuthor Commented:
Hello,

i debug, but there are no error messages. The connection is established, the VPN Client has got the IP-address 16.16.16.4, mask 255.255.255.0 and default gateway 16.16.16.1, but the local network 192.168.20.0 is not responding by ping.
The VPN works fine whithout using Vodafone as ISP.
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Istvan KalmarHead of IT Security Division Commented:
I think vodafone blocking ESP?
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it-solutionsAuthor Commented:
Solution created in cooperation with Vodafone Business Support Germany
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