Cisco Firewall :: Reverse NATing On ASA 8.2?
Jul 29, 2012
I am currently trying to apply a reverse NAT on asa 8.2 and not sure how to do this. I have done this on asdm 6.2 for asa 8.3 but the options are not simiar on 8.2. Is there a CLI equivelant?
I am trying to Achieve the object below for any traffic coming from outside interface to the inside interface with any source address to destination 10.X.X.58 then translate it so that it become 192.X.X.X to address 192.X.X.58. This is so that communications can traverse internal network as the server is not ona DMZ.
I have done this on 8.3 (shown below) but do not know if it is possible for 8.2, I have tried replicating the same command on 8.2 but commands are not recognised.
nat (outside,any) source static any 192.X.X.X destination static 10.X.X.X 192.X.X.58
Should I just upgrade to 8.3? never done it before so not sure of the consequences.
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Oct 19, 2011
I have just received 4 static ip's from my isp, i want to be able to point these ip's at different services on my internal servers, for example: [code]. The firewall I have is Cisco PIX 515, how to set the NATing up or commands?
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Jan 28, 2011
Problem with the PIX 525e while "NATING ".
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May 20, 2013
I have Pix firewall 515e on inside interface its has configured with IP 192.168.0.254.And Global Nating is configured.
global (outside) 1 interface
nat (inside) 1 192.168.0.0 255.255.255.0 0 0
I want i configured Global nating only for only specific IP address E.g 192.168.0.0-192.168.0.30 and 192.168.0.200-192.168.0.254?How i do this?
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Dec 22, 2012
i have asa901-k8.bin" in my asa firewall and downlaod liecnce from cisco,now i dont know how to allow internet to my user.?
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Aug 15, 2011
CISCO ASA 5505
Interfaces:
OUTSIDE - 194.50.90.221 255.255.255.0 / security level 0
DMZ - 192.168.12.254 255.255.255.0 / security level 25
INSIDE - 192.168.0.6 255.255.255.0 / security level 50
Now, if I want to ping from the DMZ to INSIDE, I get an error message "no translation group found for icmp src DMZ: ...... dst: INSIDE...."
I fixed is by adding "NAT 0" onto the INSIDE interface so that packets originating from "INSIDE" that are destined for "DMZ" do not get NAT'd.
Now my question is, becasue these are all directly connected networks, how come the firewall does not route the packets, but tries to NAT them instead.
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Sep 25, 2012
I have a DVR installed inside my network with local ip address 10.0.0.117/24 and i need to access it from the internet. there is a pix 515e (ios ver. 6.2) between the internet and my internal network. I've configured NAT from inside to outside to allow my internal clients to access the internet. but i need to allow external clients from the internet to access the DVR. I've tried to configure it on my pix but i found it doesn't have more options for nating like ASA.
is there any way to do that on pix and if so what the correct commands to do that.
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Jul 9, 2012
I have a Cisco ASA 5520 (Ver 8.2(4)) with all four interfaces in use (Public, Private, DMZ, Local offices) and an IPS module, so there are no spare interfaces. I have used all of Public IP's on the current interface for various services (these need one to one mapping, so I can't port map mainly due to SSL certificate issues) and I need to add another Public IP range. The secondary option on ASA interfaces does not exist as on routers/switches and I need to use an additional non contiguous IP address range for additional services advertised on the Public interface that are NAT'd to be servers in my DMZ.
I have seen an example of adding a static arp on the Private interface to allow a secondary gateway to be used for outbound traffic, but I need to allow 14 new IP addresses to be NAT'd from the Public to DMZ and possibly also for outbound NAT'ing (from either Private or DMZ to the Public). I have a L2 switch between the ISP router and the firewall, so using VLAN's is not an option unless the ISP can be persuaded (highly unlikey) to add the seondary IP's as a sub interface with tagging. Anyway if this was actioned then we would have a massive outage on our current IP range during the transistion.
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Feb 10, 2013
I have 2 data centers conencted via WAN and each has their own Internet conenction. One of the site's Internet is close to maximum bandwidth and we want to use the second site's Internet for future connections. The problem is the core switches in each site has a default rout to their local firewalls, so even if I can NAT on the firewall, the return traffic goes out whichever firewall is local and will fail.
So, my plan is to change the source IP address of the packets to be an address on the inside interface's LAN subnet. That way it is routed back to the proper firewall. I am able to do this with the following code, but this code only works with a static one to one NAT. I am limited in public IP addresses, so I want to NAT on a per port basis. Each time I try to change the any any to a specific port, it fails.
object network host-inside-int
host 10.1.52.172
object network host-outside-nat1
[Code].....
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Dec 22, 2012
After upgrade to 9.0.1 from 8.4 I have problems with reverse dns resolving, like this:
named[2679]: DNS format error from 193.0.9.1#53 resolving 82.64/27.195.26.72.in-addr.arpa/PTR for client 127.0.0.1#37124: question section mismatch: got 90.64.195.26.in-addr.arpa/IN/PTR
Only solution I found is to disable inspect dns, which is not very good.
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Jun 3, 2012
I have an ASA5510 running version 8.2(5) I am having an issue with routing/natting from an internal network to the outside interface IP on port 443 which has a nat back in to another internal address. i works externally in from a public address. i also see log messages to do with IP Spoofing
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Jun 15, 2012
ASA running 8.2(5).When I enable ip spoofing on my network interfaces I see this getting logged:
Deny UDP reverse path check from 10.100.100.102 to 10.100.100.255 on interface SPECTRA-LAN
This is because interface SPECTRA-LAN (VLAN50) is the interface connected to the network with ip 10.100.100.0/24 but the interface do not have a ip address so it does not exist in the routing table I believe?However interface INTERN do also belong to network 10.100.100.0/24 which also is the management interface and the default route for hosts in network 10.100.100.0/24, but has no vlan.
1. move the management0/0 to SPECTRA-LAN and give SPECTRA-LAN ip 10.100.100.1?
2. give SPECTRA-LAN a ip address in the 10.100.100.0 range?
My routing table and interface list is:
Current available interface(s):
DATA-BACKUP Name of interface Redundant1.10
DMZ Name of interface Redundant1.900
GUEST Name of interface Redundant1.990
HOSTING Name of interface Redundant1.100
Infrastruktur Name of interface Redundant1.20
[code]....
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Jun 15, 2011
I've got a 5520 running 8.4(1).I've setup a simple NAT: [code] Running wireshark on the outside of the ASA, I can see the packets going out fine (the source address has been translated). I can see the replies coming in from the 'net. But the replies don't get through the ASA to the internal host.What do I need to do to allow the reverse packets to get through the ASA back to the host ?
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May 16, 2013
We have a singe IP Address in the Internet and want to forward SMTP traffic that hits our ASA Outside Interace to the internal Mailserver.And we like to forward Http Traffic to our Webserver.
Example.
212.23.23.23 Port 25 -> 192.168.1.100 Port 25
212.23.23.23 Port 80 -> 192 168.1.200 Port 80
How do i acomplish that. Which NAT rules do in need?
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Jan 24, 2012
I have the need to do an outbound NAT redirection. So what I mean is this. I have a custom program that uses SSH to port 22 from a server inside the ASA firewall. This goes out to a server on the Internet over port 22. The ISP of the SSH server told me that they changed their SSH port from 22 to 2102. So instead of changing the custom code on the developed application on the server... I thought it would be easier to do a OUTBOUND NAT redirection for the ASA to see port 22 from the server and redirect it OUTBOUND to port 2102.
so for example:
The server is at 192.168.0.2 and it uses a program to initiate SSH traffic to 205.246.1.1. The server sends to port 22 but I need it automatically changed on the firewall to port 2201 at 205.246.1.1.
It is a Cisco ASA 5510. The server at 192.168.0.2 does have a fixed IP address on the outside with INBOUND NAT for things like port 25 (mail) traffic etc. Lets pretend that was at 64.18.23.60.
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Jul 2, 2012
After upgrading an ASA5520 from 8.4(1) to 8.4(4.1) I ran into the following trouble:
Asymmetric NAT rules matched for forward and reverse flows; Connection for tcp src outside:192.168.149.21/53 dst inside:192.168.37.123/53 [code].....
All the subnets mentioned above are connected via VPN.
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May 4, 2011
ASA-5-305013: Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src outside:192.168.13.50 dst DMZ2:192.168.13.15 (type 8, code 0) denied due to NAT reverse path failure
Cant seem to get around this one yet. I have a remote ASA that I can VPN into. It has 2 dmz's, outside and inside interface configured.
Inside subnet is 192.168.11.0 / 24
DMZ2 is 192.168.13.0 / 24
VPN client pool is 192.168.15.0 /24
I login in fine. But have no access to the DMZ2 subnet. I get the failure listed above.
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Jul 4, 2012
I am trying to lock down the VPN access on my Cisco 5520 ASA's whereby I wish not to allow users to SSH access etc on servers running on the same interface that they are VPNing into.
I did not originally configure the ASA and so I am slightly confused by some config on it. Currently when I attempt to PING a server within the same interface as the VPN network I get the following error in the logs below.
5 Jul 05 2012 09:45:15 305013 monitoringsystem Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src dmzAHdata:VPN IP dst AHdata:monitoringsystem (type 8, code 0) denied due to NAT reverse path failure
As a workaround I created a NAT exempt rule which then allowed traffic to the server in question however I wish to limit the traffic to only ICMP and when I do this in the firewall it does not take affect. Is this because of the NAT exempt rule?
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May 6, 2013
I am new to ASA's and have just configured my 5505 out the box with an outside (10.10.1.7) + inside (192.168.1.1) IP & NAT. The ASA has got a default route to another router (default geteway) thats connected to the internet. I have it connected this way so I can play and **** around with the ASA. My problem is when I try and ping a host on the ASA inside network (192.168.1.0/24) from the outside (10.10.1.0/24) I'm getting the following error: 5May 07 201316:38:36305013192.168.1.6Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src outside:10.10.1.22 dst inside:192.168.1.6 (type 8, code 0) denied due to NAT reverse path failure The recommendation from the syslog details is:"When not on the same interface as the host using NAT, use the mapped address instead of the actual address to connect to the host. In addition, enable the inspect command if the application embeds the IP address". Beliw is my config:
interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address 192.168.1.1 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 10.10.1.7 255.255.255.0!boot system disk0:/asa842-k8.binftp mode passiveclock timezone EST -5clock summer-time EDT recurringdns domain-lookup insidedns domain-lookup outsidedns server-group DefaultDNSname-server 10.10.1.1object network obj_anysubnet 0.0.0.0 0.0.0.0object network obj_net_Insidesubnet 192.168.1.0 255.255.255.0object network Outside_globalhost 10.10.1.6access-list outside_access_in extended permit icmp any any echo-replyaccess-list outside_access_in extended permit icmp any any source-quenchaccess-list outside_access_in extended permit icmp any any unreachableaccess-list outside_access_in extended permit icmp any any time-exceededaccess-list
[code]....
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Jul 29, 2012
I am seeing the following error on my Cisco ASA 5510 running 8.4(4):Asymmetric NAT rules matched for forward and reverse flows; Connection for tcp src inside:10.1.0.8/1798 dst inside:10.1.0.14/25 denied due to NAT reverse path failure .Doing research I see there are plenty of nonat statements regarding connecting from one interface to another, but why am I seeing this error on the same interface.All our servers are connected via a Cisco 3750G switch with a very basic config. Why is the firewall interjecting itself and causing these issues?
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Nov 11, 2012
Having a problem with a VPN site trying to communicate to a subnet off my ASA 5505. The network is simple, VPN IPSEC remote site is 192.168.6.0/24 and I can ping and access hosts on 192.168.10.0/24 (called InfraNet). I am now trying to allow communications between 192.168.6.0/24 (called FD_net) to 192.168.9.0/24 (called Inside) [code]
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Apr 9, 2013
I have a client with an ASA 5505 who has several networks he's trying to get communicating over a VPN tunnel with a remote office. One of the networks is not working because it's also in use on the management interface of the other side of the tunnel and neither side seems willing to re-IP their internal space.
Their proposed solution is to NAT the conflicting network on the firewall on this side to a different subnet before passing it across the tunnel. How do I implement a NAT that only the VPN tunnel uses while keeping the rest of the traffic that comes across this device un-NATted?The network in question is 192.168.0.0/24. Their desired NAT target is 172.16.0.0/24. ASA config is attached.
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Mar 18, 2011
Our ISP gave us a /30 for our external connection (with one IP being their side, and the other our firewall's outside int) and they then route a /28 down to us to give us 14 public IP addresses. Usually we use static NATs to give internal servers a public IP, and it works fine.
However, now I need to setup another VPN device with a public IP from our /28 pool. How the heck do I nat that? Should I give it's external int a private IP, and then NAT it at the first firewall? The 2nd firewall will be a VPN end point, and I'm afraid the NAT will break that.
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Jan 9, 2012
I just migrated our office network router to a RV082. While configuring it, I came across three problems:
(1) From our ISP we have four public IP addresses which I want to make use of for outbound traffic. With the previous router we used we could configure LAN IPs(ranges) to map to static public IPs. Does RV082 support this? I could not find an option for that at the web-interface. From what I understand the 1-1 NATing only goes both incoming and outgoign ways and actually is 1-1 and not the many-to-one I am looking for.
(2) How is it possible to configure incoming port forwards to use a specific WAN interface? Will it always be the primary WAN interface?
(3) Does the telnet access provide more configuration options? I could not log in to it with the same user credentials as with the web-interface.
Serial Number : NKS1532xxxxFirmware Version : v4.0.4.02-tm (Jul 4 2011 13:30:56)PID VID : RV082 V03Firmware MD5 Checksum : 1f84d8d0a2a8b99f9bfa4409e64547aaLANWorking Mode : Gateway
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Feb 28, 2011
I am facing problem in my setup which includes cisco 3560 and cisco 2811 router.Actully I am ruuning BGP in 3560 l-3 switch.Some of the customers are connect to 3560 switch via 2811 router,all of those customer having same rate-limit.Some of the customers are directly terminated in 3560 switch where i configure vlans,all vlans has different rate-limitsPROBLEM:I need to do nating to surf some of the ips only for one customer on the 3560 switch.so i m using route-map using acl on switch and doing natting on router.Using route-map i m redirecting traffic to my routers loop back interface, where i m doing natting and send it back to the switch.
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Feb 19, 2011
We have a RA Vpn split_tunnel setup in one of our locations which is working fine in all areas except for traffic destinged for one specific website using https. This vendor only allows the HTTPS connections to them to come from certain outside IP addresses. ssentially it should work like this:RAVPN_client (10.4.4.0/27) --> https request to vendor_ip (208.x.x.x) ---> ASA55XX --> NAT_to_outside_ip --> https request to vendor_ip (208.x.x.x) need to understand how you would go about NATing ONLY this specific https traffic from the RA VPN while not having to alter the setup otherwise. Internal hosts (aka behind the ASA physically) do not have any issue getting to this site, as its nat'd to the outside ip address as we expect.Here is what we are using for the NAT Exemption list he 10.2.2.x, 192.168.100.x and 172.23.2.x are other remote sites that we have. RA VPN users are using the 10.4.4.0/27 do not have any issues connecting to them, no matter the protocol.
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Oct 12, 2011
I have the following network connected and configured to a single Cisco 1800 router.
VLAN 2 (10.1.20.0/24)
|
int vlan2, ip address 10.1.20.1
|
Cisco 1800 ----- int fa0, public ip address ---- Internet
|
int vlan3, ip address 10.1.30.1
|
VLAN 3 (10.1.30.0/24)
VLAN 2 is server vlan with a webserver.
VLAN 3 is clients.
NAT configuration:
VLAN 2 and VLAN 3 is using NAT to access the internet, and both is configured as inside interfaces.fa0 is configured as outside interface. Now I don't know if this is about NAT, but I've tried several things without luck.
Problem:
A client in VLAN 3 tries to access a domain on the webserver in VLAN 2.It starts by sending a DNS query to a DNS server located at the ISP, and gets the ip address for the domain, which is of course a public ip address. Then nothing happens because the client tries to access the domain on the webserver using the public ip address, and the webserver have a local ip address 10.1.20.20 which is on the local LAN (VLAN 2).
I've tried NAT because I have to change the destination ip address, but I can't seem to get it right.
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Jan 17, 2011
I have a Cisco 881 VPN Router (TX) which connects to the Concentrator at our corporate office (NY). The TX subnet is 10.16.x.x. The corporate subnet is 10.1.x.x, 10.2.x.x, 10.9.x.x.Right now, the 881 router is only used for VPN to corporate, but, I would like to use it our primary router. We have to ISP's, and I would like to allow traffic to come in on either interface to our internal LAN to a few servers.
LAN - 10.16.1.3 / 255.255.0.0 ISP1 - 175.15.110.242 / 255.255.255.240: Gateway: 175.15.110.254ISP2 - 211.106.234.114 255.255.255.240, Gateway: 211.106.234.113Required NAT / port forwarding:211.106.234.115 -> 10.16.9.104 /
[Code]....
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Apr 27, 2013
I have a doubt on how do nat 2 internal ip addresses to 1 public ip for FTP uses.
As I know Cisco ASA cannot use to nat 2 internal ips to 1 public ip as the ASA cannot read the host header. It there anyway to control it by using acl or network object group?
My current configuration for nat 1 internal ip to 1 public ip:
static (firewall-dmz,firewall-outside) tcp 210.19.xx.xx 21 172.16.101.11 21 netmask 255.255.255.255 dns
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May 22, 2013
I have Router 2800 series Global nating is configured on it.
ip nat inside source list 111 interface Dialer1 overload
!
access-list 111 deny ip 192.168.1.0 0.0.0.255 192.168.0.0 0.0.0.255
access-list 111 permit ip 192.168.1.0 0.0.0.255 any
My object is that i want give internet access only for few users ip E.g IPs addresses from range 192.168.1.0-10 can acess intenet access other all are deny.How i do this with ACL .
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Jan 13, 2012
I have configured cisco 6509 to do nating and its not working. Static nat is perfectly working fine below is the config.
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May 8, 2011
i am on pc i want same outlook on mac no delete on main xp pro home office pc. would like to received and send email from new mac book pro: fully synced between both?
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Dec 29, 2011
I want to know the return path between my IP and a server. I know that trace route gets some information about the hops from my IP to a server (for example www.google.com) but this info is about the forward path. But I want to know what is the path from the server to my PC, what is the reverse path (return path)? What are the middle hops? In other word, I want to know where is the forward and reverse path when I ping a server? I can find the forward path using trace route, but what about the return path?
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