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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track 10 rtr 100 accessibility
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: end
When you say that "the external interface is downwards using failover techniques" you mean this failover occurred because the ASA is no longer able to reach the 31.13.72.1? Not that the actual interface is broken?
If this is the case, then the NATing is your problem. Since you're using the same VPN pool for VPN connections the ASA cannot distinguish between the two streams of traffic if the external interface is still in place. The SLA tracking only removes a route in the routing table, but does not affect what happens in the NAT process.
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.
--
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The VPN Clients cannot access any internal address
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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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