Static NAT by ASA
I configured a static NAT through my ASA, which for some
reason does not work - I think that the problem is with the NAT or
der rather than the rule itself, but I would be very grateful if someone
could you help me diagnose the problem.
command line, the rule is: -.
static (UKSCMGMT, management) 10.20.20.20 192.168.1.2 255.255.255.255 subnet mask
My theory is that anything with a destination address of 10.20.20.20 would be considered to be 192.168.1.2 on the UKSCMGMT interface.
in looking at ASDM rule looks like this
Type the address of the Source Destination interface trans
Static empty management 192.168.1.2 10.20.20.20
There are a few rules exemption related to 192.168.1.2 - but they are host-to-host and should not affect the static translation.
Yes, quite correct. You can configure NAT exemption by network instead of by each host. If you have guests that can be grouped in a subnet, configure as network instructions instead.
Tags: Cisco Security
Similar Questions
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Hi all
I have the following situation
The following rules of the static nat
static (inside, outside) tcp 200.200.200.200 80 10.0.0.200 80 netmask 255.255.255.255
static (inside, outside) 200.200.200.200 tcp 8080 10.0.0.200 80 netmask 255.255.255.255
I would redirect all packets destined for port 8080 and 80 IP address 200.200.200.200,
to the private IP address on port 80 10.0.0.200.
I tried to do that the ASA said there is already a rule, there is a way it be done?
Kind regards.
I don't think you can use port forwarding using the same local destination IP on port 80 in this way, fw will give you duplicate static entries.
You can however get around and give 10.0.0.200 NIC a secondary IP address i.e. 10.0.0.201 and make electricity as follows.
static (inside, outside) tcp 200.200.200.200 www 8080 10.0.0.201 netmask 255.255.255.255
static (inside, outside) tcp 200.200.200.200 80 10.0.0.200 80 netmask 255.255.255.255
See examples of port forwarding
http://www.Cisco.com/en/us/products/HW/vpndevc/ps2030/products_tech_note09186a00804708b4.shtml
concerning
-
ASA 5500 and static NAT 1-to-1
We currently have a pair of s ASA 5500 failover providing firewall & nat with inside, outside and the dmz interfaces. We do PAT interface for most of the internal to the external and static connections 1-to-1 NAT for specific hosts that need to accept connections from the outside inside. The space of the static nat is a 27 which includes the address of the external interface. It's that everything is working properly.
However, we are out of space for the static NAT to this/27. I would like to be able to add a different network, probably another 27, for the more static NAT but I'm a hard time to find the best way to do it. Is this possible with a network that does not include the external interface on the ASA?
Here are some of our current NAT config:
Global interface 10 (external)
NAT (inside) 10 0.0.0.0 0.0.0.0
(dmz1, outside) static dmz1-net-net dmz1 netmask 255.255.255.224
static (inside, dmz1) 192.168.0.0 192.168.0.0 netmask 255.255.0.0
static (inside, dmz1) 10.0.0.0 10.0.0.0 netmask 255.0.0.0
static (inside, outside) xx.yy.164.15 192.168.98.46 netmask 255.255.255.255
static (inside, outside) xx.yy.164.8 192.168.98.47 netmask 255.255.255.255
static (inside, outside) xx.yy.164.14 192.168.98.48 netmask 255.255.255.255
static (inside, outside) xx.yy.164.13 192.168.101.50 netmask 255.255.255.255
Thank you very much...
Hello
The correct syntax for the proxyarp activation will be
No outside sysopt noproxyarp
-
Static nat problem on ASA (v8.2)?
Tring to add a new rules static nat, but it seems that I have a not able to do
Public IP 10.10.10.10
20.20.20.20 inside the LAN IP address
try adding:
FW (config) # static (inside, outside) tcp 10.10.10.10 https 20.20.20.20 https netmask 255.255.255.255
ERROR: mapped address conflict with existing static
inside: 20.20.20.20 outside: 10.10.10.10 netmask 255.255.255.255
The rule with the same public IP already existing, but pointing to the different internal LAN IP address:
static (inside, outside) 10.10.10.10 20.20.20.21 netmask 255.255.255.255
Please advice how to solve this problem.
Thank you!
Hi Vuèko,
Please change your existing static nat to a particular port instead of letting it as ip to ip nat.
"static (inside, outside) 10.10.10.10 20.20.20.21 netmask 255.255.255.255".
And then you can add second static nat to a different IP address (i.e. within the intellectual property) and it will take it and it should work.
Thank you
Rizwan Muhammed.
-
Static NAT to 10.140.2.0 to 10.240.2.0 via VPN
I need help to set up a static nat device between oursite and seller
oursite has a subnet 10.140.2.0/24 the provider uses for something else. They asked that we nat 10.140.2.0/24 to 10.240.2.0/24 via the VPN, so they will see the 10.140 10.240? any help is appreciated. I think that map crypo acl must be standing as well, we run version 8.2
LOCAL SITE - ASA - TUNEL VPN - ASA - SITE PROVIDER
Thanks in advance
Hello Bbftijari,
In this case, according to the ASA version, but you will need to configure, this way:
Pre - 8.3
1. create groups of objects for use in the ACL,
the LOCAL_SITE object-group network
object-network 10.140.2.0 255.255.255.0the Vendor_SITE object-group network
network-object XXXXXX XXXXXX2. create ACLs, as a condition,
access-list VPN_NAT permitted object-group LOCAL_SITE object group ip Vendor_SITE
3 create the static NAT, call the ACL, so he says "when I come inside outside of LOCAL_SITE to Vendor_SITE, I will result in 10.240.2.0/24.
public static 10.240.2.0 (inside, outside) access-list VPN_NAT netmask 255.255.255.0
--------------------------------------------------------------------------------------------------------------------------------
Post 8.3
1 create the network objects and create a static entry:
the LOCAL_SITE object-group network
object-network 10.140.2.0 255.255.255.0the NAT_SITE object-group network
object-network 10.240.2.0 255.255.255.0the Vendor_SITE object-group network
network-object XXXXXX XXXXXX2. static NAT creation,
NAT (inside, outside) 1 static source LOCAL_SITE NAT_SITE Vendor_SITE Vendor_SITE non-proxy-arp-search of route static destination
Test and keep me posted.
Please note and mark it as the correct answer if it helped you.
David Castro,
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Static Nat issue unable to resolve everything tried.
Hello
I have a cisco asa 5515 with asa worm 9.4.1 and asdm 7.4
I have problem with configuring static nat, I have a server inside which ip is 172.16.1.85 and
my external interface is configured with a static ip address.
Internet works fine but cannot configure static nat...
Here's my config running if please check and let me know what Miss me...
Thank you
ASA release 9.4 (1)
!
ciscoasa hostnamenames of
!
interface GigabitEthernet0/0
nameif outside
security-level 0
IP 151.253.97.182 255.255.255.248
!
interface GigabitEthernet0/1
nameif inside
security-level 100
IP 172.16.1.1 255.255.255.0
!
interface GigabitEthernet0/2
Shutdown
No nameif
no level of security
no ip address
!
interface GigabitEthernet0/3
Shutdown
No nameif
no level of security
no ip address
!
interface GigabitEthernet0/4
Shutdown
No nameif
no level of security
no ip address
!
interface GigabitEthernet0/5
Shutdown
No nameif
no level of security
no ip address
!
interface Management0/0
management only
nameif management
security-level 100
IP 192.168.1.1 255.255.255.0
!
boot system Disk0: / asa941-smp - k8.bin
passive FTP mode
object remote desktop service
source eq 3389 destination eq 3389 tcp service
Description remote desktop
network of the RDP_SERVER object
Home 172.16.1.85
outside_access_in list extended access allow desktop remotely any4 object RDP_SERVER
pager lines 24
asdm of logging of information
Outside 1500 MTU
Within 1500 MTU
management of MTU 1500
no failover
no monitor-service-interface module of
ICMP unreachable rate-limit 1 burst-size 1
ASDM image disk0: / asdm - 743.bin
don't allow no asdm history
ARP timeout 14400
no permit-nonconnected arp
!
network of the RDP_SERVER object
NAT (inside, outside) interface static service tcp 3389 3389
!
NAT source auto after (indoor, outdoor) dynamic one interface
Access-group outside_access_in in interface outside
Route outside 0.0.0.0 0.0.0.0 151.253.97.177 1
Timeout xlate 03:00
Pat-xlate timeout 0:00:30
Timeout conn 01:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
Sunrpc timeout 0:10:00 h323 0:05:00 h225 mgcp from 01:00 0:05:00 mgcp-pat 0:05:00
Sip timeout 0:30:00 sip_media 0:02:00 prompt Protocol sip-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
Floating conn timeout 0:00:00
identity of the user by default-domain LOCAL
Enable http server
http server idle-timeout 50
http 192.168.1.0 255.255.255.0 managementTelnet 192.168.1.0 255.255.255.0 management
Telnet timeout 5
SSH stricthostkeycheck
SSH 192.168.1.0 255.255.255.0 management
SSH timeout 5
SSH group dh-Group1-sha1 key exchange
Console timeout 0
VPDN username bricks12 password * local store
management of 192.168.1.2 - dhcpd address 192.168.1.254
enable dhcpd management
!
a basic threat threat detection
Statistics-list of access threat detection
no statistical threat detection tcp-interception
dynamic-access-policy-registration DfltAccessPolicy
username, password imran guVrfhrJftPA/rQZ encrypted privilege 15
!
class-map inspection_default
match default-inspection-traffic
!
!
type of policy-card inspect dns preset_dns_map
parameters
maximum message length automatic of customer
message-length maximum 512
Policy-map global_policy
class inspection_default
inspect the preset_dns_map dns
inspect the ftp
inspect h323 h225
inspect the h323 ras
inspect the rsh
inspect the rtsp
inspect esmtp
inspect sqlnet
inspect the skinny
inspect sunrpc
inspect xdmcp
inspect the sip
inspect the netbios
inspect the tftp
Review the ip options
!
global service-policy global_policy
context of prompt hostname
anonymous reporting remote callciscoasa #.
Hello
Change this ACL: -.
outside_access_in list extended access allow desktop remotely any4 object RDP_SERVER
TO
outside_access_in list extended access allowed object RDP_SERVER eq any4 tcp 3389
Thank you and best regards,
Maryse Amrodia
-
All,
I have nat 0 ACL indicating that an ip address should not be natted, while a static nat statement saying we need natted. I just want to know that we will have precedence.
Thank you
It is of the order of operations PIX nat / ASA.
the NAT 0 acl_name (nameif) has priority.
1 nat 0-list of access (free from nat)
2. match the existing xlates
3. match the static controls
a. static NAT with no access list
b. static PAT with no access list
4. match orders nat
a. nat [id] access-list (first match)
b. nat [id] [address] [mask] (best match)
i. If the ID is 0, create an xlate identity
II. use global pool for dynamic NAT
III. use global dynamic pool for PAT
-
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
HTH,
Lei Tian
-
Hi Experts,
Please help me on this. I enclose my diagram network with this post.
My firewall is cisco ASA 5510 running with version 8.4 of software. I set up static NAT for all three servers (in the diagram, server 1,2 and 3). The question is, the static NAT works only with the first server. No trades do go to other two server (2 and 3). All servers are in the DMZ.When I remove the static NAT for Server 2 and 3, all traffic going to the server with the IP WAN address of the firewall, which means that the dynamic NAT works. I am also attaching the configuration file.
(NOTE: NAT works for the 72.16.34.1 Server)
Kind regards
MartinHI San,
Would you be able to try this workaround: -.
https://supportforums.Cisco.com/blog/149276/asapix-proxy-ARP-vs-gratuito...
I think the problem is with the IP addresses provided by the ISP.
Thank you and best regards,
Maryse Amrodia
-
Public static political static NAT in conflict with NAT VPN
I have a situation where I need to create a VPN site-to site between an ASA 5505 using IOS 7.2 and a Sonicwall NSA4500. The problem arises where the LAN behind the Cisco ASA has the same subnet an existing VPN currently created on the Sonicwall. Since the Sonicwall cannot have two VPN both run on the same subnet, the solution is to use policy NAT on the SAA as well as for the Sonicwall, the new VPN seems to have a different subnet.
The current subnet behind the ASA is 192.168.10.0/24 (The Sonicwall already has a private network virtual created for another customer with the same subnet). I try to translate it to 192.168.24.0/24. The peer LAN (behind the Sonicwall) is 10.159.0.0/24. The ASA relevant configuration is:
interface Vlan1
IP 192.168.10.1 255.255.255.0
access extensive list ip 192.168.24.0 outside_1_cryptomap allow 255.255.255.0 10.159.0.0 255.255.255.0
list of access VPN extended permit ip 192.168.10.0 255.255.255.0 10.159.0.0 255.255.255.0
public static 192.168.24.0 (inside, outside) - list of VPN access
card crypto outside_map 1 match address outside_1_cryptomap
In addition, there are other static NAT instructions and their associated ACLs that allow certain traffic through the firewall on the server, for example:
public static tcp (indoor, outdoor) interface smtp SERVER smtp netmask 255.255.255.255
The problem is this: when I enter the static strategy statement NAT, I get the message ' WARNING: real-address conflict with existing static "and then it refers to each of the static NAT statements reflecting the external address to the server. I've thought about it, and it seemed to me that the problem was that policy NAT statement must be the first statement of NAT (it is the last one) so that it is run first and all traffic destined to the VPN to the Sonicwall (destination 10.159.0.0/24) tunnel would be properly treated. If I left him as the last statement, then the other static NAT statements would prevent a part of the 10.159.0.0/24 network-bound traffic to be correctly routed through the VPN.
So, I tried first to my stated policy NAT upward in the ASDM GUI interface. However, moving the declaration was not allowed. Then I tried to delete the five static NAT statements that point to the server (an example is above) and then recreate them, hoping that would then move up the policy statement NAT. This also failed.
What Miss me?
Hello
I assumed that we could have changed the order of the 'static' , the original orders, but as it did not work for some reason any then it seems to me that you suggested or change, that I proposed should work.
I guess that your purpose was to set up static political PAT for the VPN for some these services, then static PAT of public network access, then static NAT to policy for the rest of the network in-house.
I guess you could choose any way seems best for you.
Let me know if get you it working. I always find it strange that the original configuration did not work.
Remember to mark a reply as the answer if it answered your question.
Feel free to ask more if necessary
-Jouni
-
2 static NAT on the same Interface
I have an ASA 5510 (8.2 (5)) and I'm trying to set up a VPN site-to site of one of our suppliers. The problem I am running into is that they want me NAT one specific to one of our servers private IP, and this server already has a static NAT from the outside of a demilitarized zone. It's the current rule NAT:
static (DMZ1, external) 65.43.x.x 10.0.0.3 netmask 255.255.255.255
and they want card me 172.28.9.42 on the same server, so I tried to add:
(DMZ1, external) 172.28.9.42 static 10.0.0.3 netmask 255.255.255.255
but can not because it's a double translation.
Any help would be greatly appreciated.
Hello
It seems to me you must configure a static NAT to politics
Configurations would be as follows
DMZ-POLICY-NAT of ip 10.0.0.3 host allowed access list
(DMZ1, external) 172.28.9.42 static access-list DMZ-POLICY-NAT
Regarding configurations
- Name of the ACL can be naturally you want
- Destination network can be a single host if necessary IP address
- You should be able to configure multiple lines if necessary
Note that you need to have this NAT configuration before the real public IP address command static NAT. You need to remove the existing static NAT to configure the above and add the original.
This is because if you do not configure static NAT of politics first in the configuration, all traffic will keep hitting the normal rule of the static NAT for the public IP address.
-Jouni
-
Cannot access static nat address via vpn.
I have an asa5510 where I
a static nat from one interface to the other.
I also have a VPN connection to the asa...
On the other side of the vpn connection, I can not access this static NAT.
192.168.170.x is the vpn network.
Is it not possible to access the static NAT over vpn?
the DM_INLINE_NETWORK_16 object-group network
object-network 192.168.0.0 255.255.255.0
object-network vxtron 255.255.255.0
object-network dmz_zone 255.255.255.0
object-network 192.168.170.0 255.255.255.0MPLS_nat0_outbound list extended access deny host ip 172.26.1.5 all
Access extensive list ip 172.26.0.0 MPLS_nat0_outbound allow 255.255.252.0 object-group DM_INLINE_NETWORK_16
pnat1 list extended access permit ip host 172.26.1.5 all
static (MPLS, inside) 192.168.0.199 access list pnat1
NAT (MPLS) 0-list of access MPLS_nat0_outbound
NAT (MPLS) 1 172.26.0.0 255.255.252.0
static (MPLS, inside) 172.26.1.5 MPLS_nat_static access listRené, happy you including yourself this one! If you could, please mark the post as solved so that we know that it is not need more attention
-
Dual active/passive failover of ISP with static Nat on Cisco 1941
Hello world
I'm working on a configuration of a client and I have everything in place right now except the NAT' static ing. The config fails during an ISP to another and track als and routes by default static weighted, the PAT rocking with course to each interface maps. It is, is it possible to switch on the large amount of static NAT entries to the ISP of backup? So far, everything I've read said no because you can have only one entry per ip/port combo, other than another configuration static NAT double server with a different IP address. I just want to be sure before making my recommendations, all thoughts are greatly appreciated.
Thank you
Brandon
In fact, you can also long as you use standard NAT ("ip nat inside source static") or not NVI ('ip nat static source') for your attackers. You apply the roadmap by the end of the static NAT statement to indicate which interface it should apply to. So, if you have something like this:
ip access-list extended ACL_NAT permit ip 192.168.0.0 255.255.255.0 any ! route-map RM_NAT_ISP1 match ip address ACL_NAT match interface GigabitEthernet0/1 ! route-map RM_NAT_ISP2 match ip address ACL_NAT match interface GigabitEthernet0/2
Using port 80/tcp for example, you can do this:
ip nat inside source static tcp x.x.x.x 80 y.y.y.y 80 route-map RM_NAT_ISP1 ip nat inside source static tcp x.x.x.x 80 z.z.z.z 80 route-map RM_NAT_ISP2
Just replace x.x.x.x with the LAN address of the machine that you are shipping y.y.y.y with the WAN address you are shipping on isps1 and z.z.z.z with the address of the ISP WAN you are shipping on ISP2. The static NAT will be conditional on the roadmap, at this point.
This works with TCP, UDP, and IP forwarding, but does not require that you use an IPv4 address to your WAN address. For some reason, it does not work if you use an interface... so if you're using dynamic addresses, it will be more complicated.
-
Public static NAT vs. Access-List
Hello
I have a question what is the best practice static NAT and access list. Example:
Server (192.168.1.1) Web inside to outside (10.10.10.10) with the port 80 and 443.
IP nat inside source static tcp 192.168.1.1 80 10.10.10.10 80
IP nat inside source static tcp 192.168.1.1 10.10.10.10 443 443
Or
IP nat inside source static 192.168.1.1 10.10.10.10
Access-list 101 permit tcp any host 10.10.10.10 eq 80
Access-list 101 permit tcp any host 10.10.10.10 eq 443
interface ethernet0
IP access-group 101 inThank you
The operational reasons - it will break things.
-
Static NAT enable VPN site-to-site.
Hello
We plan to build VPN site to site, but, we have a single public routerable internet IP address to assign VPN on Site A, but Site B is ok.
in this case, I think that we must use static NAT on the router, the simple diagram is as below.
internal a subnet - router VPN - router for Internet of the Site - to - VPN - B B Site internal subnet.
the final goal is to make the communication between internal a subnet and subnet B on IPSEC tunnel.
OK, as I said, Site A having a public IP address, then it must use the static NAT and need to apply on the Site router.
Router
interface x/x
Head of ESCR to the internet
NAT outside IP
!
interface x/x
Head of DESC to internal (VPN)
IP nat inside
!
IP nat inside source static (like IP address x.x.x.x) public (as private VPN interface IP x.x.x.x)
so, wouldn't be work without any problem? I think it will work, but I would find other one just in case.
Hey,.
Is that what you try to achieve:
subnet A - A = vpn router = router B - Sub-B network
and you need communicate between Subnet A and subnet via ipsec vpn b?
Concerning
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