?
Solved

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

Posted on 2014-11-14
8
Medium Priority
?
643 Views
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
0
Comment
Question by:netprimates
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
8 Comments
 
LVL 22

Expert Comment

by:Matt V
ID: 40448417
I'm not sure why you want to use different ports for the tunnels.  You can have multiple tunnels connected over the same ports.
0
 

Author Comment

by:netprimates
ID: 40448552
Different EP's behind the traversal device in the middle
0
 

Author Comment

by:netprimates
ID: 40448553
Traversal device isn't terminating the tunnels
0
Flexible connectivity for any environment

The KE6900 series can extend and deploy computers with high definition displays across multiple stations in a variety of applications that suit any environment. Expand computer use to stations across multiple rooms with dynamic access.

 
LVL 22

Accepted Solution

by:
Matt V earned 1500 total points
ID: 40448852
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.
0
 

Author Comment

by:netprimates
ID: 40449180
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.
0
 
LVL 22

Expert Comment

by:Matt V
ID: 40449544
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?
0
 

Author Comment

by:netprimates
ID: 40449549
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.
0
 
LVL 22

Expert Comment

by:Matt V
ID: 40449579
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
0

Featured Post

WatchGuard's M Series Appliances - Miecom Approved

WatchGuard's newest M series appliances were put to the test by Miercom.  We had great results and outperformed all of our competitors in both stateless and stateful traffic throghput scenarios! Ready to see how your UTM appliance stacked up? Download the Miercom Report!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For months I had no idea how to 'discover' the IP address of the other end of a link (without asking someone who knows), and it drove me batty. Think about it. You can't use Cisco Discovery Protocol (CDP) because it's not implemented on the ASAs.…
WARNING:   If you follow the instructions here, you will wipe out your VTP and VLAN configurations.  Make sure you have backed up your switch!!! I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TA…
As a trusted technology advisor to your customers you are likely getting the daily question of, ‘should I put this in the cloud?’ As customer demands for cloud services increases, companies will see a shift from traditional buying patterns to new…
Both in life and business – not all partnerships are created equal. Spend 30 short minutes with us to learn:   • Key questions to ask when considering a partnership to accelerate your business into the cloud • Pitfalls and mistakes other partners…
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question