Internal address NAT before moving on to the VPN

Hi all

I was instructed to retire a VPN concentrator 3000 and its replacement by an ASA 5520.  I'm trying get a handle on how to implement the NATs and ACL, since most of my experience is remote access VPN, not from site to site.  In addition, I have not configured a VPN 3000 in about 6 years so I'll have to re - learn a lot from the interface.

The VPN 3000 has a feature called NAT LAN-to-LAN rules that basically allow NAT address on your internal network to an address on the 'local' network for LAN-to-LAN connection, so it can then walk through the tunnel to the remote side.  The configuration looks something like this in the VPN 3000:

Network source translated network remote network

172.16.3.151 192.168.200.151 10.3.136.0

That seems to me like a "political static NAT" in ASDM.  If I have one of those implemented, who should translate 172.16.3.151 to the inside interface for 192.168.200.151 inside (Yes, the same interface) interface which (logically) then should be picked up as "interesting traffic" by the crypto-plan and sent through the VPN tunnel.  However, appears not to be the case - the two 'followed package' in the ASDM and traceroute of the source workstation show packages inside the interface and then sent right on the external interface to the internet router (which then removes the packages because they have a private IP address).

I don't know I missed something fundamental... what else do I need to do the pick-up card crypto traffic NATted?

Hi Greg Dickinson,.

This is the scenario. You can have several object groups in your scenario is possible.

Original of your LAN IP on the Site b LAN IP Allow acl must be used for the NAT/PAT.

!

NAT_ACLpermit 172.16.3.0 ip access list 255.255.255.0 10.3.136.0 255.255.255.0

public static 192.168.200.0 (indoor, outdoor) 255.255.255.0 access-list NAT_ACL

!

CryptoACL 192.168.200.0 ip access list allow 255.255.255.0 10.3.136.0 255.255.255.0

!

crypto map outside_map 1 corresponds to the address CryptoACL

Your IP NAT/PAT to the @ Site of subnet IP LAN/IP B will be the Cryptoacl for the VPN.

So, whenever you hit traffic for a site of LAN you will hit it NAT/PAT and translates.

Then your crypto acl will be with your PAT IP and it should synchronize with Site B.

Please rate for useful messages.

By

Knockaert

Tags: Cisco Security

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    try to change the NAT statement follows him and the test (don't forget to remove the other statements to exempt of NAT for this traffic during the test):

    NAT (inside,any) static static source NETWORK_OBJ_192.168.30.0_25 destination DM_INLINE_NETWORK_1 DM_INLINE_NETWORK_1 NETWORK_OBJ_192.168.30.0_25

    If this does not work, I would either turn off the external interface when a failover occurs, or create a second connection profile that contains a separate mass of IP for the VPN connection and ask users to connect using this profile when a failover takes place.  Don't forget to create Nat exempt instructions for this traffic also.

    --

    Please note all useful posts

  • The VPN Clients cannot access any internal address

    Without a doubt need help from an expert on this one...

    Attempting to define a client access on an ASA 5520 VPN that was used only as a

    Firewall so far. The ASA has been recently updated to Version 7.2 (4).

    Problem: Once connected, VPN client cannot access anything whatsoever. Client VPN cannot

    ping any address on internal networks, or even the inside interface of the ASA.

    (I hope) Relevant details:

    (1) the tunnel seems to be upward. Customers are the authenticated by the SAA and

    are able to connect.

    (2) by many other related posts, I ran a ' sh crypto ipsec her "to see the output: it

    appears that the packets are décapsulés and decrypted, but NOT encapsulated or

    encrypted (see the output of "sh crypto ipsec his ' home).

    (3) by the other related posts, we've added commands associated with inversion of NAT (crypto

    ISAKMP nat-traversal 20

    crypto ISAKMP ipsec-over-port tcp 10000). These were in fact absent from our

    Configuration.

    (4) we tried encapsulation TCP and UDP encapsulation with experimental client

    profiles: same result in both cases.

    (5) if I (attempt) ping to an internal IP address of the connected customer, the

    real-time log entries ASA show the installation and dismantling of the ICMP requests to the

    the inner target customer.

    (6) the capture of packets to the internal address (one that we try to do a ping of the)

    VPN client) shows that the ICMP request has been received and answered. (See attachment

    shooting).

    (7) our goal is to create about 10 VPN client of different profiles, each with

    different combinations of access to the internal VLAN or DMZ VLAN. We do not have

    preferences for the type of encryption or method, as long as it is safe and it works: that

    said, do not hesitate to recommend a different approach altogether.

    We have tried everything we can think of, so any help or advice would be greatly

    Sanitized the ASA configuration is also attached.

    appreciated!

    Thank you!

    It should be the last step :)

    on 6509

    IP route 172.16.100.0 255.255.255.0 172.16.20.2

    and ASA

    no road inside 172.16.40.0 255.255.255.0 172.16.20.2

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