Is it possible to put behind a NAT DMVPN hub? (Speaks has a public IP address)

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• Static NAT & DMVPN Hub

  Hello

  I don't think that will be a problem DMVPN supports the rays behind NAT devices, but I anticipate change my network for reasons of security and redudancy autour and putting a pair of ASA firewalls on my Internet collocation.  Right now I have a DMVPN race 3845, NAT & ZBFW.  I'm going to remove the ZBFW and move the NAT to the ASA, leaving only the DMVPN hub and routing.  If I create a static NAT mapping on my ASA to point to the DMVPN hub that will work?

  I think it will be, but I just wanted to be 110% sure.

  Thank you!

  Hi Brantley,

  DMVPN with static NAT on the hub is supported in the installer. Just be awear it there are limits.

  1, all DMVPN router, hub and spokes must be running at least 12.3(9a) and 12.3 (11) T code.

  2, must use ipsec transport mode.

  3, so need dynamic tunnel talk to rays, hub should work at least 12.3 (13), 12.3 (14) T and 12.3 (11) T3 code.

  See the configuration guide

  http://www.Cisco.com/en/us/docs/iOS/sec_secure_connectivity/configuration/guide/sec_DMVPN_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1122466

  HTH,

  Lei Tian

• Site to Site VPN Possible behind routers NAT on both ends?

  Nice day

  After extensive research I have not found an answer so I turn to the community.

  I'm trying to help a friend facility a VPN but it's a scenario that I have not dealt and hope that someone has.

  Here's the basic scheme;

  Site 1 - 172.16.23.0/24

  Site 2 - 172.16.24.0/24

  (Site of ASA 1 - router 172.16.23.5) - Linksys w / static public IP - Internet - Linksys router w / static public IP-(ASA Site 2 - 172.16.24.5)

  Is this possible scenario with port forwarding?  The warnings, I need to watch out for?

  I read that I'll need a route to my ASA, say Site 1 ASA, who said... Route 172.16.24.0 255.255.255.0 1.1.1.1 (point to ASA local public IP).

  I also read I'll need one additional lane in my (site 1) linksys router that says... Route 172.16.24.0 255.255.255.0 172.16.23.5 (point to the local interface of the ASA)

  Thanks for all comments and suggestions.

  A

  Hi Adam,.

  You are right with a port forwarding, you can create an IPSEC tunnel, even if NAT is present on both ends.

  Also, NAT - T is a feature enabled by default on the ASA that automatically detects if the camera is behind a NAT and pass the IPSEC UDP 4500 port. Here is the syntax of the command:

  ASA (config) # crypto isakmp nat-traversal 20

  How NAT - T works

  So, here is a document for your reference build the VPN tunnel:

  http://www.Cisco.com/c/en/us/support/docs/security/ASA-5500-x-series-next-generation-firewalls/119141-configure-ASA-00.html

  About routing, all traffic will go out of the ASA using intellectual property where the card encryption is applied, routing on linkysys devices just take care that this IP is routed Internet and that there is connection between the 2 ASAs.

  It may be useful

  -Randy-

• multiple clients behind a NAT IPSec

  In our head office, I have a Pix 515e which acts as our VPN server.

  Several clients at a remote office are requiring VPN access to the corporate network, but can only connect at once. If a second connects the premiera is abandoned.

  I suspect that this is because they are sitting behind a Natted router and all share the same public address.

  When I was installing all first the VPNGroups I read an article that has discussed this problem and offered a solution, but I can't seem to locate it. Is this possible on a 6.3 (4) Version FOS Pix

  Denny,

  Sounds to me that you must enable (on your PIX, config mode):

  > isakmp nat-traversal

  Let me know if this helps and if she please post rates as if you need an explanation on the NAT - T then let me know.

  Jay

• Is it possible to put a server on the DMZ SQL

  Hi all

  He would ask about the deployment of PIX. Is it possible to put a server on DMZ SQL (or one of 5 exclusion inside the interface interfaces) and simply define a NAT to allow inside the user access to the DMZ? Also without allowing the outside user access to SQL server. We intend to set a SQL on a DMZ server, such that unathourized internal users will not be able to know the actual address of the SQL Server.

  Are there problems which should be considered on this deployment?

  Thanks in advance,

  udimpas

  Hi Udimpas,

  Yes, your scenario is possible. You can put SQL Server on the DMZ network and allow access to inside users. at the same time, you can also block the access from the outside.

  Let's say, your sql IP address is 192.168.1.10 & your home LAN is 10.1.1.0/24. You can do the following:

  NAT (inside) 0 access-list sheep

  access-list allowed sheep ip 10.1.1.0 255.255.255.0 host 192.168.1.10

  by doing this, you have not nat all traffic from your inside sql server. In case you have defined everything inside your network access lists, you must open port 1433.

  list of access within permit udp 10.1.1.0 255.255.255.0 host 192.168.1.10 eq 1433

  You should not add the ACL above, if you have no restrictions from the inside, from now.

  I hope this helps... all the best...

  REDA

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• Sourcefire - module behind a nat

  How to configure the module and how it the module is located behind a nat device? That means be id nat?

  Let's say the remote SFR module is 192.168.1.1 and the public ip address is 1.1.1.1. The management center of SFR is 10.10.10.10 and appears as 2.2.2.2 on the internet.

  The nat id is just a value randomly selected and used on both sides?

  What is the configuration for the sourcefire module, configure the Manager add 2.2.2.2 Council nat - id 50000?

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  The manual of 5.4 in Chapter 4 article 8 (page 128) icover this topic, but I don't think that does it pretty well.

  Thank you

  Rich

  Hello

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  Let me know if you get a specific error?

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• Using Cisco Client to site VPN on a behind a NAT ASA 5520

  I apologize if this has been asked and we answered in the forums.  I looked, and while I found a large number of entries that were dancing all around this question, I never found nothing which addressed this specific issue.   We currently use an ASA 5520 as the head end of a relatively large customer to site IPSEC VPN (approximately 240 users, not consecutively).   This ASA is currently sitting behind a Checkpoint firewall with a real publicly addressable IP address on its public interface.  All of our customers use the legacy Cisco VPN (not the one anyconnect) client.  We plan to a few controllers F5 link set up between ISPS and firewalls.   For VPN connectivity F5 recommends that we NAT IP address (called a broad IP) to point back to a private IP address on the ASA and F5.  My question is, will this work?   I've always heard say that the head of line needed to have a public IP address on this subject because this is what will be placed in packages for the client to respond to.

  For further information, here's what we have now and what we are invited to attend.

  Current

  ISP - router - firewall-fire - ASA (public IP address as endpoint)

  Proposed

  ISP - router - F5 (public IP address as endpoint using a NAT to ASA) - Firewall - ASA (10.X.X.X as its external interface)

  Proposed alternative

  ISP - router - F5 (public IP address as endpoint using a NAT to ASA) - ASA (10.X.X.X as its external interface)

  All thoughts at this moment would be greatly appreciated.   Thank you!

  Hello

  If there is a static NAT one by one on F5 to the external interface of the ASA, then I don't think they would be any problems.
  Because when the client will attempt to connect to IKE to the translated public IP, F5 will redirect the request to ASA outside interface that is configured for the VPN.

  In addition, to ensure the udp500, 4500 and esp is allowed and then you should be good to go.

  HTH

  Concerning
  Mohit

• DMVPN behind a NAT

  Hello

  is there a way to configure a router as a router spoke, where it doesn't have a PUBLIC IP address?

  It's like this:

  Spoke router-> private-> NAT-> Internet-> DMVPN Hub router router IP

  I tried on 12.3 (14) T7.

  There is no problem to have talks DMVPN behind NAT.

  Empty:

  http://www.Cisco.com/en/us/docs/iOS/sec_secure_connectivity/configuration/guide/dmvpn_dt_spokes_b_nat_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1060395

  Usually on a device with State there is no need to allow all ports for inbound traffic.

  However, UDP/500 and UDP/4500 will be required if you use the DMVPN or GRE tunnel protection if you don't protect it with IPsec.

  I suggest trying on a device with a more recent software. 12.4 (15) Tx or 12.4 (24) Tx?

  Marcin

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