Solved

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

Posted on 2014-11-14
8
624 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
Forrester Webinar: xMatters Delivers 261% ROI

Guest speaker Dean Davison, Forrester Principal Consultant, explains how a Fortune 500 communication company using xMatters found these results: Achieved a 261% ROI, Experienced $753,280 in net present value benefits over 3 years and Reduced MTTR by 91% for tier 1 incidents.

 
LVL 22

Accepted Solution

by:
Matt V earned 500 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

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
URGENT- Can't login to Bizportal over VPN 2 43
Public DNS  Vs BGP 20 58
SSL VPN to Fortigate 100D 2 19
Simple Fibre Question 6 37
Getting hacked is no longer a matter or "if you get hacked" — the 2016 cyber threat landscape is now titled "when you get hacked." When it happens — will you be proactive, or reactive?
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
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…

726 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