With NAT VPN tunnels

I have read on several posts on the topic and still think I'm missing something, I'm looking for help.

Basically, I'm now implementing multiple VPN tunnels for external connections. We strive to keep the external "private addresses" our basic using NAT network.

I can get the Tunnel to work without problems using the ACL SHEEP; However, this technique requires that our internal network is aware of their external addresses "private." Our goal is to enter an address on the inside that is NAT to the external address 'private' and then shipped via the VPN tunnel. Basically to hide the external address 'private' of our internal systems that they would appear as thought the connection was one of our own networks.

The reverse is true coming from their external 'private' network. Any information of "their" private network external origin would result in our 'private' on arrival address space.

Is this possible? I am attaching a schema, which could help.

Hello

Yes, this should be possible. Lets say you allocate 10.112.2.250 as the address that you use to present the external server 192.168.10.10.

On your ASA device

public static 10.112.2.250 (exterior, Interior) 192.168.10.10 netmask 255.255.255.255

You will need to make sure that when the system tries to connect to 10.112.2.250 it is routed to the device of the SAA.

HTH

Jon

Tags: Cisco Security

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    First of all, I would like to remove these two lines because they do nothing productive

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    Then, I was running packet - trace to see what NAT rule actually hit you.
    packet-tracer input inside 10.1.12.232 12345 10.24.4.65 12345

  • IPSec Tunnel between Cisco 2801 and Netscren 50 with NAT and static

    Hello

    My problem isn't really the IPSec connection between two devices (it is already done...) But my problem is that I have a mail server on the site of Cisco, who have a static NAT from inside to outside. Due to the static NAT, I do not see the server in the VPN tunnel. I found a document that almost describes the problem:

    "Configuration of a router IPSEC Tunnel private-to-private network with NAT and static" (Document ID 14144)

    NAT takes place before the encryption verification!

    In this document, the solution is 'routing policy' using the loopback interface. But, how can I handle this with the Netscreen firewall. Someone has an idea?

    Thanks for any help

    Best regards

    Heiko

    Hello

    Try to change your static NAT with static NAT based policy.

    That is to say the static NAT should not be applicable for VPN traffic

    permissible static route map 1

    corresponds to the IP 104

    access-list 104 refuse host ip 10.1.110.10 10.1.0.0 255.255.0.0

    access-list 104 allow the host ip 10.1.110.10 all

    IP nat inside source static 10.1.110.10 81.222.33.90 map of static route

    HTH

    Kind regards

    GE.

  • VPN on ASA 5506 without internet access, help with NAT?

    Hello

    I have upgraded to a Cisco ASA 5505 to a 5506 X and as such have climbed to ASA 9.5

    For this reason, I'm a bit stuck on how to implement the VPN. I followed the wizard and I can now establish inbound connections, but when connected (all traffic is tunnel) there is no internet connectivity.

    Our offices internal (inside) network is 192.168.2.0/24

    Our VPN pool is 192.168.4.0/24

    I guess that I'm missing a NAT rule, but in all honesty, I'm a user ASDM and as everything is changed, I am struggling to recreate it?

    Here is my config:

    Result of the command: "sh run"

: Saved

:
: Serial Number: JAD194306H5
: Hardware:   ASA5506, 4096 MB RAM, CPU Atom C2000 series 1250 MHz, 1 CPU (4 cores)
:
ASA Version 9.5(1)
!
hostname ciscoasanew
domain-name work.internal
enable password ... encrypted
names
ip local pool RemoteVPNPool 192.168.4.1-192.168.4.254 mask 255.255.255.0
!
interface GigabitEthernet1/1
 nameif outside
 security-level 0
 ip address 192.168.3.4 255.255.255.0
!
interface GigabitEthernet1/2
 nameif inside
 security-level 100
 ip address 192.168.2.197 255.255.255.0
!
interface GigabitEthernet1/3
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet1/4
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet1/5
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet1/6
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet1/7
 shutdown
 no nameif
 no security-level
 no ip address
!
interface GigabitEthernet1/8
 shutdown
 no nameif
 no security-level
 no ip address
!
interface Management1/1
 management-only
 nameif management
 security-level 100
 ip address 192.168.1.1 255.255.255.0
!
ftp mode passive
clock timezone GMT 0
dns domain-lookup inside
dns domain-lookup management
dns server-group DefaultDNS
 name-server 192.168.2.199
 domain-name work.internal
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
object network obj_any
 subnet 0.0.0.0 0.0.0.0
object network 173.0.82.0
 host 173.0.82.0
object network 173.0.82.1
 subnet 66.211.0.0 255.255.255.0
object network 216.113.0.0
 subnet 216.113.0.0 255.255.255.0
object network 64.4.0.0
 subnet 64.4.0.0 255.255.255.0
object network 66.135.0.0
 subnet 66.135.0.0 255.255.255.0
object network a
 host 192.168.7.7
object network devweb
 host 192.168.2.205
object network DevwebSSH
 host 192.168.2.205
object network DEV-WEB-SSH
 host 192.168.2.205
object network DEVWEB-SSH
 host 192.168.2.205
object network vpn-network
 subnet 192.168.4.0 255.255.255.0
object network NETWORK_OBJ_192.168.4.0_24
 subnet 192.168.4.0 255.255.255.0
object network NETWORK_OBJ_192.168.2.0_24
 subnet 192.168.2.0 255.255.255.0
object-group network EC2ExternalIPs
 network-object host 52.18.73.220
 network-object host 54.154.134.173
 network-object host 54.194.224.47
 network-object host 54.194.224.48
 network-object host 54.76.189.66
 network-object host 54.76.5.79
object-group network PayPal
 network-object object 173.0.82.0
 network-object object 173.0.82.1
 network-object object 216.113.0.0
 network-object object 64.4.0.0
 network-object object 66.135.0.0
object-group service DM_INLINE_SERVICE_1
 service-object icmp
 service-object icmp6
 service-object icmp alternate-address
 service-object icmp conversion-error
 service-object icmp echo
 service-object icmp information-reply
 service-object icmp information-request
access-list outside_access_in extended permit tcp object-group EC2ExternalIPs object DEVWEB-SSH eq ssh
access-list outside_access_in remark AWS Servers
access-list outside_access_in extended permit tcp object-group EC2ExternalIPs object devweb eq ssh log debugging inactive
access-list outside_access_in extended permit ip any any inactive
access-list outside_access_in remark Ping reply
access-list outside_access_in extended permit object-group DM_INLINE_SERVICE_1 any interface outside
access-list outside_access_in remark Alarm
access-list outside_access_in extended permit tcp any interface outside eq 10001
access-list outside_access_in remark CCTV
access-list outside_access_in extended permit tcp any interface outside eq 7443
access-list outside_access_in extended deny ip any any
access-list workvpn_splitTunnelAcl_1 standard permit 192.168.2.0 255.255.255.0
access-list workvpn_splitTunnelAcl_1 standard permit 162.13.130.12 255.255.255.252
access-list workvpn_splitTunnelAcl_1 standard permit 162.13.133.72 255.255.255.252
access-list workvpn_splitTunnelAcl_1 standard permit 164.177.128.200 255.255.255.252
access-list workvpn_splitTunnelAcl_1 standard permit 164.177.132.16 255.255.255.252
access-list workvpn_splitTunnelAcl_1 standard permit 164.177.132.72 255.255.255.252
access-list workvpn_splitTunnelAcl_1 standard permit 212.64.147.184 255.255.255.248
access-list workvpn_splitTunnelAcl_1 standard permit 95.138.147.116 255.255.255.254
access-list workvpn_splitTunnelAcl_1 standard permit 95.138.147.118 255.255.255.254
access-list workvpn_splitTunnelAcl_1 standard permit host 95.138.147.118
access-list workvpn_splitTunnelAcl_1 standard permit 95.138.147.120 255.255.255.254
access-list inside_nat0_outbound extended permit ip 192.168.2.0 255.255.255.0 192.168.4.0 255.255.255.0
access-list workvpn2_splitTunnelAcl standard permit 192.168.2.0 255.255.255.0
access-list workVPN2016_splitTunnelAcl standard permit 192.168.2.0 255.255.255.0
pager lines 24
logging enable
logging buffer-size 16000
logging asdm-buffer-size 512
logging asdm warnings
logging flash-bufferwrap
mtu outside 1500
mtu inside 1500
mtu management 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 7200
no arp permit-nonconnected
nat (inside,outside) source static NETWORK_OBJ_192.168.2.0_24 NETWORK_OBJ_192.168.2.0_24 destination static NETWORK_OBJ_192.168.4.0_24 NETWORK_OBJ_192.168.4.0_24 no-proxy-arp route-lookup
!
object network obj_any
 nat (any,outside) dynamic interface
object network DEVWEB-SSH
 nat (inside,outside) static interface service tcp ssh ssh
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 192.168.3.3 1
timeout xlate 3:00:00
timeout pat-xlate 0:00:30
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 inside
http 192.168.2.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
service sw-reset-button
crypto ipsec ikev1 transform-set ESP-AES-256-MD5 esp-aes-256 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-SHA esp-des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-3DES-SHA esp-3des esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-DES-MD5 esp-des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-MD5 esp-aes-192 esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-AES-256-SHA esp-aes-256 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-SHA esp-aes esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-192-SHA esp-aes-192 esp-sha-hmac
crypto ipsec ikev1 transform-set ESP-AES-128-MD5 esp-aes esp-md5-hmac
crypto ipsec security-association pmtu-aging infinite
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set pfs group1
crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set ikev1 transform-set ESP-AES-128-SHA ESP-AES-128-MD5 ESP-AES-192-SHA ESP-AES-192-MD5 ESP-AES-256-SHA ESP-AES-256-MD5 ESP-3DES-SHA ESP-3DES-MD5 ESP-DES-SHA ESP-DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
crypto map outside_map interface outside
crypto ca trustpoint _SmartCallHome_ServerCA
 no validation-usage
 crl configure
crypto ca trustpoint ASDM_Launcher_Access_TrustPoint_0
 enrollment self
 fqdn none
 subject-name CN=192.168.2.197,CN=ciscoasanew
 keypair ASDM_LAUNCHER
 crl configure

snip

dhcpd auto_config outside
!
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
no threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
threat-detection statistics access-list
threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside vpnlb-ip
group-policy DfltGrpPolicy attributes
 vpn-tunnel-protocol ssl-client
group-policy workVPN2016 internal
group-policy workVPN2016 attributes
 dns-server value 192.168.2.199
 vpn-tunnel-protocol ikev1
 split-tunnel-policy tunnelall
 ipv6-split-tunnel-policy tunnelall
 default-domain value work.internal
 split-dns value work.internal
 split-tunnel-all-dns enable
dynamic-access-policy-record DfltAccessPolicy

!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum client auto
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
  inspect ip-options
!
service-policy global_policy global
prompt hostname context
call-home reporting anonymous
hpm topN enable
Cryptochecksum:
: end

    Hi Ben-

    What you are trying to accomplish is called VPN crossed.  Depending on your initial configuration, you have 2 NAT problems.  The first has to do with the NAT you place your order.  In the code later that we are dealing with two NAT ASA 8.3 times and who are ranked 2 sections going on before and after the device NAT. object

    My general rule for control of NAT is like this:

    1. Twice NAT (front) - use this section for exemptions from NAT or unusual configurations that have to go first
    2. Purpose of NAT - Use this section to the static NAT instructions for servers
    3. Twice NAT (after) - use this section to your global declarations of NAT, basically a catch-all

    Then, never use 'all' as an interface for all training of NAT.  This may seem like a good idea, but it will bite you.  Remember, it is more the notion of control NAT, then 'all' interface is bit VPN configurations and similar DMZ.  Always be specific about your interface for NAT pairs.

    To this end, here is what I suggest that your NAT configuration should resemble:

    nat (inside,outside) source static NETWORK_OBJ_192.168.2.0_24 NETWORK_OBJ_192.168.2.0_24 destination static NETWORK_OBJ_192.168.4.0_24 NETWORK_OBJ_192.168.4.0_24 no-proxy-arp route-lookup!object network DEVWEB-SSH nat (inside,outside) static interface service tcp ssh ssh !nat (inside,outside) after-auto source dynamic any interfacenat (outside,outside) after-auto source dynamic any interface
    The key is that you need a NAT device explicitly reflecting the VPN traffic. PSC

  • NAT, ASA, 2 neworks and a VPN tunnel

    Hello. I have a following question. I am trying to establish a VPN tunnel to a remote network used to be connected to our via a VPN tunnel. The problem is that the previous tunnel their share has been created for the x.x.x.x our coast network which will serve no more time a month, but is currently still active and used. As I'm trying to get this VPN tunnel as soon as possible without going through all the paperwork on the other side (political, don't ask) is it possible to make NAT of the new network in the network x.x.x.x for traffic through the VPN tunnel.

    Something like this:

    new network-> policy NAT in old x.x.x.x fork on ASA-> VPN tunnel to the remote network using x.x.x.x addresses

    It is possible to add the new policy, but sometimes it can conflict with the former.

  • I need VPN gateway to gateway with NAT for several subnets, RV082

    I have a pair of RV082 routers and I would like to configure a gateway to gateway VPN tunnel, as described in a book, "How to configure a VPN tunnel that routes all traffic to the remote gateway," (name of file Small_business_router_tunnel_Branch_to_Main.doc).  I followed this recipe book and found that my while the main office has internet connectivity, the branch subnet is not an internet connection.

    Routing behaves as advertised, where all traffic goes to the seat.  However, the 192.168.1.0 subnet in the branch receives no internet connectivity.  I read in other posts that the main router will provide only NAT for the local subnet, not the Management Office subnet.  Is it possible to configure the RV082 router to provide NAT for all subnets?

    If this is not the case, what product Cisco will provide connectivity VPN Tunnel as well as the NAT for all subnets?  The RV082 can be used as part of the final solution or are my RV082s a wasted expense?

    Here is the configuration that I had put in place, (real IP and IKE keys are false).

    Bridge to bridge

    Remote Head Office

    Add a new Tunnel

    No de tunnel                  1                                               2

    Name of the tunnel:, n1 n1-2122012_n2-1282012-2122012_n2-1282012

    Interface: WAN1 WAN1

    Enable :                   yes                                             yes

    --------------------------------------------------------------------------------

    Configuration of local groups

    Type of local security gateway: IP only IP only

    IP address: 10.10.10.123 10.10.10.50

    Local security group type: subnet subnet

    IP address: 192.168.1.0 0.0.0.0

    Subnet mask: 255.255.255.0 0.0.0.0

    --------------------------------------------------------------------------------

    Configuration of the remote control groups

    Remote security gateway type: IP only IP only

    IP address: 65.182.226.50 67.22.242.123

    Security remote control unit Type: subnet subnet

    IP address: 0.0.0.0 192.168.1.0

    Subnet mask: 0.0.0.0 255.255.255.0

    --------------------------------------------------------------------------------

    IPSec configuration

    Input mode: IKE with preshared key IKE with preshared key

    Group of the phase 1 of DH: Group 5 - 1536 bit group 5 - 1536 bit

    Encryption of the phase 1: of THE

    The phase 1 authentication: MD5 MD5

    Step 1 time in HIS life: 2800 2800 seconds

    Perfect Forward Secrecy: Yes Yes

    Group of the phase 2 DH: Group 5 - 1536 bit group 5 - 1536 bit

    Encryption of the phase 2: of THE

    Phase 2 of authentication: MD5 MD5

    Time of the phase 2 of HIS life: 3600 seconds 3600 seconds

    Preshared key: MyKey MYKey

    Minimum complexity of pre-shared key: Enable Yes Enable

    --------------------------------------------------------------------------------

    If you are running 4.x firmware on your RV082, you must add an additional Allow access rule for the Branch Office subnet (considered one of the multiple subnets in the main office) may have access to the internet. Note the firmware version has more details about it.

    http://www.Cisco.com/en/us/docs/routers/CSBR/rv0xx/release/rv0xx_rn_v4-1-1-01.PDF

  • IOS IPSEC VPN with NAT - translation problem

    I'm having a problem with IOS IPSEC VPN configuration.

    /*

    crypto ISAKMP policy 10

    BA 3des

    preshared authentication

    Group 2

    ISAKMP crypto keys TEST123 address 205.xx.1.4

    !

    !

    Crypto ipsec transform-set esp-3des esp-sha-hmac CHAIN

    !

    !

    Map 10 CRYPTO map ipsec-isakmp crypto

    the value of 205.xx.1.4 peer

    transformation-CHAIN game

    match address 115

    !

    interface FastEthernet0/0

    Description FOR the EDGE ROUTER

    IP address 208.xx.xx.33 255.255.255.252

    NAT outside IP

    card crypto CRYPTO-map

    !

    interface FastEthernet0/1

    INTERNAL NETWORK description

    IP 10.15.2.4 255.255.255.0

    IP nat inside

    access-list 115 permit 192.xx.xx.128 0.0.0.3 ip 172.xx.1.0 0.0.0.3

    */

    (This configuration is incomplete / NAT configuration needed)

    Here is the solution that I'm looking for:

    When a session is initiated from the "internal network" to the "distance IPSEC - 172.xx.1.0/30 ' network I want the address scheme '10.15.0.0/16' NAT translation deals with '192.xx.xx.128/30' before forwarding via the IPSEC VPN Tunnel.

    For more information, see "SCHEMA ATTACHED".

    Any help is greatly appreciated!

    Thank you

    Clint Simmons

    Network engineer

    You can try the following NAT + route map approach (method 2 in this link)

    http://www.Cisco.com/en/us/Tech/tk648/tk361/technologies_tech_note09186a0080093fca.shtml

    Thank you

    Raja K

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