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Cisco Router 881 VPN with Vodafone 3G Card

Posted on 2011-02-20
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Last Modified: 2012-05-11
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?
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Question by:it-solutions
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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34938743
Hi,

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

Best regards,
Istvan
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Expert Comment

by:Rick_at_ptscinti
ID: 34938762
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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Author Comment

by:it-solutions
ID: 34940282
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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Netscaler Common Configuration How To guides

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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34940818
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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Author Comment

by:it-solutions
ID: 34940887
What do you mean with "need to enable it on the central site"?
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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34940969
ahh the central sit is the 881?
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Author Comment

by:it-solutions
ID: 34941005
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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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34941022
ok...

in this case you need to enable nat-t:
crypto ipsec nat-transparency udp-encapsulation
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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34941038
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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Author Comment

by:it-solutions
ID: 34941114
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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LVL 34

Expert Comment

by:Istvan Kalmar
ID: 34941761
I think vodafone blocking ESP?
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Accepted Solution

by:
it-solutions earned 0 total points
ID: 34941805
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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Author Closing Comment

by:it-solutions
ID: 34986384
Solution created in cooperation with Vodafone Business Support Germany
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If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

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