Remote access ASA, VPN and NAT

Hello

I try to get access to remote VPN work using a Cisco VPN client and ASA with no split tunneling. The VPN works a little, I can access devices inside when I connect, but I can't access the Internet. I don't see any errors in the log ASA except these:

1 Jul 04:59:15 % ASA-3-305006 gatekeeper: failed to create translation portmap for udp src outside:192.168.47.200/137 dst outside:192.168.47.255/137
1 Jul 04:59:15 % ASA-3-305006 gatekeeper: failed to create translation portmap for udp src outside:192.168.47.200/54918 dst outsidexx.xxx.xxx.xxx/53

There is only one address public IP that is assigned to the external interface of DHCP. The Interior is 192.168.1.0/24 network which is PAT'ed to the external interface and the VPN network is 192.168.47.X.

I think my problem is that the net.47 is not NAT'ed out properly and I don't know how to put in place exactly. I can't understand how this is supposed to work since the net VPN technically provenance from the outside already.

Here are all the relevant config:

list of vpn access extended permits all ip 192.168.47.0 255.255.255.0
Within 1500 MTU
Outside 1500 MTU
IP local pool vpnpool 192.168.47.200 - 192.168.47.220 mask 255.255.255.0
IP verify reverse path to the outside interface
IP audit info alarm drop action
IP audit attack alarm drop action
ICMP unreachable rate-limit 1 burst-size 1
ICMP allow all outside
Global interface (2 inside)
Global 1 interface (outside)
NAT (inside) 0-list of access vpn
NAT (inside) 1 0.0.0.0 0.0.0.0
NAT (outside) 2 192.168.47.0 255.255.255.0 outside
static (inside, outside) tcp 3074 XBOX360 3074 netmask 255.255.255.255 interface
static (inside, outside) udp 3074 XBOX360 3074 netmask 255.255.255.255 interface
public static (inside, outside) udp interface 88 88 XBOX360 netmask 255.255.255.255
public static tcp (indoor, outdoor) https someids netmask 255.255.255.255 https interface

I can post more of the configuration if necessary.

Change ' nat (outside) 2 192.168.47.0 255.255.255.0 apart ' "NAT (2-list of vpn access outdoors outside)" gives these:

1 Jul 06:18:35 % gatekeeper ASA-3-305005: no group of translation not found for udp src outside:192.168.47.200/56003 dst outside:66.174.95.44/53

So, how I do right NAT VPN traffic so it can access the Internet?

A few things that needs to be changed:

(1) NAT exemption what ACL must be modified to be more specific while the traffic between the internal subnets and subnet pool vpn is not coordinated. NAT exemption takes precedence over all other statements of NAT, so your internet traffic from the vpn does not work.

This ACL:

list of vpn access extended permits all ip 192.168.47.0 255.255.255.0

Should be changed to:

extensive list of access vpn ip 192.168.47.0 255.255.255.0 allow

(2) you don't need statement "overall (inside) 2. Here's what to be configured:

no nat (outside) 2 192.168.47.0 255.255.255.0 outside

no global interface (2 inside)

NAT (outside) 1 192.168.47.0 255.255.255.0

(3) and finally, you must activate the following allow traffic back on the external interface:

permit same-security-traffic intra-interface

And don't forget to clear xlate after the changes described above and connect to your VPN.

Hope that helps.

Tags: Cisco Security

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    -Jouni

  • Problem with the VPN and NAT configuration

    Hi all

    I have a VPN tunnel and NATing participates at the remote site.

    I have the VPN tunnel from the absolutely perfect traffic from users, but I am struggling to manage the device via SNMP through the VPN tunnel.

    Remote subnet is 192.168.10.0/24

    That subnet gets PAT'd to 192.168.4.254/32

    The subnet to HQ is 10.0.16.0/24

    IP address of the ASA remote is 192.168.10.10

    Of course, as this subnet is NAT would have I created a static NAT so that the 192.168.4.253 translates 192.168.10.10.

    I can see that packets destined to the 192.168.4.253 device address comes to the end of the tunnel as long as the number of packets decrypted increases when you run a continuous ping to the device.

    However, the unit will not return these packages. The wristwatch that 0 packets encrypted.

    Please let me know if you need more information, or the output of the configuration complete.

    When I start a capture on the ASA remote, I don't see ICMP packets to reach the ASA REAL ip (192.168.10.10). Maybe I set my NAT evil?

    Also, there is no Interface inside, only an Interface outside. And the default route points to the next router ISP Hop on the external Interface.

    Hope that all of the senses.

    Thank you

    Mario Rosa

    No, unfortunately you can not NAT the ASA outside the IP of the interface itself.

  • Split of static traffic between the VPN and NAT

    Hi all

    We have a VPN from Site to Site that secures all traffic to and from 10.160.8.0/24 to/from 10.0.0.0/8.  It's for everything - including Internet traffic.  However, there is one exception (of course)...

    The part that I can't make it work is if traffic comes from the VPN (10.0.0.0/8) of 10.160.8.5 (on 80 or 443), then the return traffic must go back through the VPN.  BUT, if traffic 80 or 443 comes from anywhere else (Internet via X.X.X.X which translates to 10.160.8.5), so there need to be translated réécrirait Internet via Gig2.

    I have the following Setup (tried to have just the neccessarry lines)...

    interface GigabitEthernet2

    address IP Y.Y.Y.Y 255.255.255.0! the X.X.X.X and Y.Y.Y.Y are in the same subnet

    address IP X.X.X.X 255.255.255.0 secondary

    NAT outside IP

    card crypto ipsec-map-S2S

    interface GigabitEthernet4.2020

    Description 2020

    encapsulation dot1Q 2020

    IP 10.160.8.1 255.255.255.0

    IP nat inside

    IP virtual-reassembly

    IP nat inside source list interface NAT-output GigabitEthernet2 overload

    IP nat inside source static tcp 10.160.8.5 80 80 X.X.X.X map route No. - NAT extensible

    IP nat inside source static tcp 10.160.8.5 443 443 X.X.X.X map route No. - NAT extensible

    NAT-outgoing extended IP access list

    refuse 10.160.8.5 tcp host 10.0.0.0 0.0.0.255 eq www

    refuse 10.160.8.5 tcp host 10.0.0.0 0.0.0.255 eq 443

    permit tcp host 10.160.8.5 all eq www

    permit tcp host 10.160.8.5 any eq 443

    No. - NAT extended IP access list

    refuse 10.160.8.5 tcp host 10.0.0.0 0.0.0.255 eq www

    refuse 10.160.8.5 tcp host 10.0.0.0 0.0.0.255 eq 443

    allow an ip

    route No. - NAT allowed 10 map

    corresponds to the IP no. - NAT

    With the above configuration, we can get to the Internet 10.160.8.5, but cannot cross it over the VPN tunnel (from 10.200.0.0/16).  If I remove the two commands «ip nat inside source static...» ', then the opposite that happens - I can get then to 10.160.8.5 it VPN tunnel but I now can't get to it from the Internet.

    How can I get both?  It seems that when I hit the first NAT instruction (overload Gig2) that 'decline' in the list of ACL-NAT-outgoing punts me out of this statement of NAT.  It can process the following statement of NAT (one of the 'ip nat inside source static... ") but does not seem to"deny"it in the NON - NAT ACL me punt out of this statement of NAT.  That's my theory anyway (maybe something is happening?)

    If this work like that or I understand something correctly?  It's on a router Cisco's Cloud Services (CSR 1000v).

    Thank you!

    Your netmask is bad for your 10.0.0.0/8. I worry not about the port/protocol or since that can screw you up. A better way to do it would be to deny all IP vpn traffic.

    NAT-outgoing extended IP access list

    deny ip 10.160.8.0 0.0.0.0.255 10.0.0.0 0.255.255.255

    ...

    No. - NAT extended IP access list

    deny ip 10.160.8.0 0.0.0.0.255 10.0.0.0 0.255.255.255

    allow an ip

    Doc:

    Router to router IPSec with NAT and Cisco Secure VPN Client overload

    Thank you

    Brendan

  • Tunnel VPN and NAT

    Hello. I'm creating a tunnel VPN IPSec LAN - to - LAN of my ASA5510 to another network but met an obstacle bit. My counterpart on the other side has informed me that he already has a VPN tunnel to another company that has the same IP range as my network(10.100.16.0 /24) and can not create the tunnel.

    I was wondering is it possible to use NAT on the VPN tunnel so that traffic that goes from my network over the VPN tunnel gets translated and my counterpart on the other side sees this reflects the range of IP addresses?

    Thanks in advance for any help.

    Hello

    Yes, you can use the same address you already use for internet access.

    Just update your list of access crypto to reflect the new address and to ensure that the third party did the same.

    Jon

  • [LAN to LAN] Remote access ASA to DNS central

    Hello

    I set up a Lan to lan VPN between our headquarters (10.0.0.0/8) and a remote site (192.168.1.0/24)

    It works very well! Remote computer on the site can contact the servers in the main office.

    My only problem is when ASA2 would use the DNS server in the main office.

    It uses IP outside2 to contact the DNS server, so it does not pass through the VPN.

    What is the best way to force ASA2 contact DNS VPN server?

    Thanks for your help,

    Patrick

    No, unfortunately the ASA cannot decide what interface to use as a source for DNS queries.

    If you can put a permanent road to the ASA2 outside the IP address of the DNS server if you move the DNS to the ASA1 response

    Tariq

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