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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?
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?
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?
ASKER
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
@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
try it:
crypto ipsec nat-transparency udp-encapsulation
But in this case you need to enable it on the central SITE!
Best regards,
Istvan
crypto ipsec nat-transparency udp-encapsulation
But in this case you need to enable it on the central SITE!
Best regards,
Istvan
ASKER
What do you mean with "need to enable it on the central site"?
ahh the central sit is the 881?
ASKER
Yes, the central site is the 881, and we try to buildup a vpn-connection over vodafone 3g with Cisco VPN-Client 5.x.
ok...
in this case you need to enable nat-t:
crypto ipsec nat-transparency udp-encapsulation
in this case you need to enable nat-t:
crypto ipsec nat-transparency udp-encapsulation
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
what shows the log on the router?
did you tried to debug?
deb cry isa
deb cry ips
ASKER
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.
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.
I think vodafone blocking ESP?
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ASKER
Solution created in cooperation with Vodafone Business Support Germany
In this case you need to enable NAT-T on vpn concentrator!
Best regards,
Istvan