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Cisco LAN-to-LAN IPsec Tunnel Between Two Routers with a NAT device in the middle

Posted on 2014-11-14
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Last Modified: 2014-11-22
Hi

Topology is

Cisco 881 (Outside on the Internet) wanting to create a number of tunnels to Cisco 881's inside a MPLS network. The MPLS provider has provided a Gateway with a Public IP address and they  have created a different IKE and IPSEC port for each inside host that we want to create a tunnel too.

I.e IKE 4510 / IPSEC 45010 redirect inside to inside Host 10.10.1.100 IKE 500 / IPSEC 4500

Can I on my Cisco 881 on the Internet specify the destination ports that happen in Phase 1 and Phase 2?

Running a very basic L2L Config atm between hosts within the MPLS as per Cisco - http://www.cisco.com/c/en/us/support/docs/routers/1700-series-modular-access-routers/71462-rtr-l2l-ipsec-split.html

 Kind Regards

Steve
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Question by:netprimates
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by:Matt V
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I'm not sure why you want to use different ports for the tunnels.  You can have multiple tunnels connected over the same ports.
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by:netprimates
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Different EP's behind the traversal device in the middle
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by:netprimates
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Traversal device isn't terminating the tunnels
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Matt V earned 500 total points
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In that case you may need to have enough outward facing IPs for each EP to connect.

No way that I am aware of to specify which ports the tunnel will use.
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by:netprimates
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I thought as much, the tunnels are created from the public internet through to the internal EP so they will need a dedicated public IP per private EP. One would assume.
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by:Matt V
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That would be my understanding as well.  No way you could combine those end points into one larger one and route the tunnels out from there?
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by:netprimates
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I am afraid not, I wish. I pushed to have a connection into the site that was on the MPLS but some bright spark thought it best to put it behind a NAT traversal box.

I didn't think there was an option to specify the ports on a Cisco config but they insisted you can.
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by:Matt V
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Looks like you can use encapsulation on an ASA, but if you are using IOS devices you are out of luck.

https://supportforums.cisco.com/discussion/11085486/how-change-port-number-isakmp
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