Cisco Firewall :: ASA 8.4 With NAT Source Address Translation?
Dec 5, 2012
I have a server in a DMZ of my 8.4 ASA with nat:
object network FTP-SERVER
host 192.168.1.102
nat (dmz,outside) static interface tcp ftp ftp
And that's working well. However, I now need to translate the source address of connections from the outside to the FTP server as well. The aim is that the source address of packets when they reach the FTP server is an address on the DMZ subnet (as the default route for the FTP server now needs to be something else, not the ASA) as well as this outside-dmz NAT. I thought overloading the DMZ interface of the ASA? Or another IP in that range?
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Feb 20, 2013
Some network pros have setup our Cisco 3620 many years back during implementation.
I've just added a new server, with new ip, wanted to change the ip of ip nat translation in this router.
I did a show run, the config is this;
interface FastEthernet0/0
ip address 57.31.132.116 255.255.255.240
no ip redirects
[Code]......
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Oct 31, 2011
I am trying to correctly configure our ASA 5520 and our Mitel Border Gateway in our DMZ. In the documentation for the Mitel border gateway it wants me to set up 2 external IP's on my ASA one to allow 443 traffice into the MBG, and another for 443 traffic that needs to be forwarded to port 4443 for the MGB in the DMZ. My problem is I don't know how to do this. the MBG only has one IP, and I need to have 2 different URL's mapped to two different external IP's both externally using port 443, and one of them forwarding to 4443 on the DMZ interface.
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Jan 19, 2013
Is it possible to perform static Nat's through an internal network?I have a ASA 5510 with a public outside interface (let’s call it 68.68.68.1), and I have an inside private IP address (192.168.1.2/24). The inside IP address leads to a 4900m with that interface being configured with a 192.168.1.1 (no switching). On the 4900 M I have several VLANs one of them is an internal DMZ of sorts. (192.168.2.0/24). Within this DMZ network are several Web servers which need to be associated a public IP address (68.68.68.x).
Every time I configure a static Nat to associating a public IP address with an internal IP address within the DMZ, packet Tracer on the ASA informs me that the packet gets dropped at the static Nat and I cannot figure out why this is so.Safe it to say my question still stands is it possible to Nat (68.68.68.222 to and 92.168.2.60) given the configuration above, and how would I go about configuring in such the manner above so that I acn apply static nat through the 192.168.1.0 network to reach the 192.168.2.0 network.
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Aug 22, 2011
I have an 8.3(2) ASA with a single outside IP. Dynamic PAT translates inside addresses to the outside interface address. I would like to use static NAT with port translation to access an inside syslog server. I got an error when I tried using the outside interface address. Can I use both dynamic PAT and Port Translation with the same outside address?This is what I would like to use but I receive an error saying there is an overlap using the outside interface address.(192.168.1.0 is my inside network. 10.10.1.10 is the outside interface IP.)
object network inside-net
subnet 192.168.1.0 255.255.255.0
nat (inside, outside) dynamic interface
object network SYSLOG_SERVER
host 192.168.1.50
nat (inside,outside) static 10.10.1.10 service tcp ssh ssh
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Oct 29, 2012
Does ASA 8.4.3 check the source IP address of a DNS reply and drop it if the reply address is different to that in the query?
Customers DNS server does this due to a recent change, their server now has a virtual address, but replies are sent from its physcial address. This is temporary. Their PIX is happy with this.
Replace the PIX with the ASA, DNS fails, the only reason I can see is due to the way their internal DNS operates.
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Mar 21, 2011
I'm using a 2911 as our Public Internet Edge Router. I have 2 public sub net blocks from Sprint, we are in the process of migrating. What i need to do is NAT any source address from the Internet from an address on one of our public blocks to the other.
Example:
Source Address 11.10.10.10 ==> Destination 64.165.123.10 (nat this to 64.165.54.10) inbound.
So if from the internet tries to hit 64.165.123.10 we want to nat that to 64.165.54.10 both of which sit on our public space.
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Jul 4, 2012
I have a problem with random host's geting the wrong source address on a ASA 5512-X 8.6(1). Right now there is a host, 192.168.25.108, showing up with 6.6.6.6 (fake) on whatsmyip.org, should be 5.5.5.5 like the rest of 192.168.25.0/24. In the xlate tabel I cant find anything wrong. Same yesterday with two host, that are using the right NAT address today.
nat (any,outside) dynamic interface. (5.5.5.5)
object network H-192.168.25.10
nat (inside,outside) static H-6.6.6.6X(code)
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May 10, 2012
customer has a server which located in inside interace. and an outside interface connected to ISPA. cu config a static nat map inside server address to ISPA address, one day customer install a new outside interface to ISPB, cu config new static nat ,map same server inside server address to ISPB address. the server will allways be vistited from outside interface and reply, custome want traffic coming from ISPA will return to ISPA, traffic coming from ISPB will return to ISPB. but i found it is difficult implement this on ASA5580. i want use route-map on static nat, but it will not satisfy customer's request.
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Jul 13, 2011
i have a problem customer has a server which located in inside interace. and an outside interface connected to ISPA. cu config a static nat map inside server address to ISPA address one day customer install a new outside interface to ISPB, cu config new static nat ,map same server inside server address to ISPB address. the server will allways be vistited from outside interface and reply, custome want traffic coming from ISPA will return to ISPA, traffic coming from ISPB will return to ISPB. but i found it is difficult implement this on ASA5580. i want use route-map on static nat, but it will not satisfy customer's request.
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Oct 18, 2011
I have 5 static public IP addresses assigned by my ISP. I like to use one of these static public IP addresses to access one of my PCs in my office from the outside. So I like to configure something like:65.11.22.44 <-> 192.168.1.100.This translation is good for all protocols and all ports. Where I can configure this on the DIR655?
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Nov 22, 2012
We've got an application that is running on our LAN that is using IP addressing to connect to the server (they refused to use DNS).The server is now being moved to a VM which will be on a different subnet. The supplier is now concerned that there will be a big down time due to him having to reconfigure each device (about 100) with the new server IP. If the server was external I know I'd be able to do NAT on the FW to make this work but can it be done internally on my 6500s? I want to have the devices pointing at their hardcoded IP address off 1.1.1.10 and NAT the destination to the VMware servers IP 2.2.2.10? Is this possible using cisco NAT?
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Nov 12, 2011
I would like to know if Cisco Collector Engine 6.0 can recive and reading the sent address traslation logging of router ASR1006. Using Netflow v9.
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Apr 18, 2011
How Stuff Works "How Network Address Translation Works"."This is where NAT (RFC 1631) comes to the rescue. Network Address Translation allows a single device, such as a router, to act as an agent between the Internet (or "public network") and a local (or "private") network. This means that only a single, unique IP address is required to represent an entire group of computers." so let's say 6-7 pc's can have access to the internet using the same IP. doesn't this causes any problems? what if one of those pc's was used fore doing something illegal? how can they spot it later on? or what if 2 or more pc's access (from that subnetwork) access the same website with the same IP?
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Aug 4, 2012
I have site to site vpn between cisco asa and cisco 2911 router.asa is static ip and cisco 2911 side is dynamic ip. my site to site vpn is working fine. I am just trying to make PAT over the vpn means i want forward one ip in my public pool to one of my local ip in the cisco 2911 side.
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Mar 24, 2011
In my router I can set rule that all traffic incoming to router's extAddr:8888, is forwarded to my intAddr:8888. But I also need reverse rule that packets originating from intAddr:8888 are translated to extAddr:8888. Can I do that? What technique can I search on google to find more information, because it is not port forwarding. I would calll it reverse port forwarding or static port address translation, but I do not find anything useful in internet searching these keywords.
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Mar 21, 2013
I've configured the ACE4710 to bring the logging to a syslog server! Here's the configuration
[...]
logging enable
logging fastpath
[Code]....
I saw to log with connection on the syslog server but It would be interesting to know the "source ip address" and my question is : It may be possible to configure for the logging a kind of "transparent pass through"?
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Aug 1, 2012
i would like to use the ACS 5.3 as TACACS Proxy. Basically it works. But when checking the logs on the destination TACACS Server (ACS 4.2) i see that all requests (Source-NAs) came from the IP of the TACACS-Proxy. Not from the original source IP.
This is useless for my scenario, because on the destination TACACS Server the policies are built on the NetworkDevices Groups and AAA Clients = source IPs.
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Aug 23, 2011
I'm stuck with some NAT issues. I've got an 800-series router wich connects to the internet via a PPP connection (dialer0). On the inside the router has 192.168.0.253/24 as IP address, the outside is negotiated with the ISP
My mailserver has the ip address of 192.168.0.1 but with default gateway of 192.168.0.254 (primary internet connection). If I use plain NAT (ip nat inside source static tcp 192.168.0.1 25 interface Dialer0 80) the packets arriving on the mailserver do have a public IP address as source address.
Would it be possible to rewrite those packets (source address) so they have 192.168.0.253 as source address. This way the mailserver won't send the replies to it's default gateway but back to the cisco router.
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Feb 8, 2006
One of our Cat5513 has been displaying a lot of the error message below:
%SYS-4-P2_WARN: 8/Invalid traffic from multicast source address 01:00:5a:52:4c:4d on port 8/58
The frequency of this is quite disturbing. What this error is about? Module no.8 is our Gigabit Ethernet WS-X5410. Can that multicast address be mapped to an IP address or unicast mac-addresS? How can i go about resolving this?
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Sep 3, 2012
Most of the 4500 Switches in our network are giving the similar error for so many ports
%C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 1 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on p t Gi2/6 in vlan 100
Its impossible to do a wireshark packet tracing for all the ports.
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Feb 14, 2012
Issue I am having with a Cisco 4507? Below is the error i am receiving.
Feb 14 10:06:09 EST: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 508 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on port Po10 in vlan 112
Feb 14 18:44:06 EST: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 119 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on port Po10 in vlan 112
Feb 15 00:51:06 EST: %C4K_L2MAN-6-INVALIDSOURCEADDRESSPACKET: (Suppressed 366 times)Packet received with invalid source MAC address (00:00:00:00:00:00) on port Po10 in vlan 112
[Code]...
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Feb 27, 2013
There is a unicast flood on 3750 killing slow modem links. How to determine source MAC address of flooder? Is there a rate limit feature for it?
I know how to block it completely on port-level, but it breaks normal network operation. (when port goes down for some reason, it's learned MACs got flushed and since other hosts know MACs, they keep flooding untill their arp caches expire).
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Aug 24, 2012
I am going with ASA 5520, know how many NAT translation is possible.
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Sep 6, 2012
Im having a (from google-fu) seemingly unique issue with load balancing. So for background, I am running the ACE 4710 device in "on a stick" mode, so I am using NAT and all that good stuff. I am also utilizing class maps and host header matching so I can save on IP space. [code]
Basically, as soon as I add that ACL_CLASS_beta.mainsite.com class map, all I get back from the ACE is RST packets and it comes back with an L7 LB Policy Miss.
It SEEMS like it should work, but it doesnt seem to like matching on those source addresses at all.
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May 30, 2011
I'm trying to migrate from olda PIX to newest ASA 8.4.1. Everything seems to be good except the static NAT. [code]
The inside interface uses implicit rule. ( permit any less secure network )
Although te above config the ASA logs the following.
TCP access denied by ACL from 94.94.94.94/2003 to outside:86.101.228.221/80
The 86.101.228.221 our public Internet IP whic are used as outside IP also.
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Mar 1, 2012
I have some issues with Twin PAT on ASA (8.4.2), there is sth I dont udnerstand FTP server is on the inside and client is in outside.
I did sth like this
object network NATED-11
host 20.20.20.11
object network REAL-2
host 10.200.200.2
object service SRV-FTP
service tcp destination eq ftp
nat (outside,inside) source static any any destination static NATED-11 REAL-2 service SRV-FTP SRV-FTP so teoretically there should be a problem in NAT cause there is a second channel for data etc. BUT according to docs "For applications that require application inspection for secondary channels (for example, FTP and VoIP),the ASA automatically translates the secondary ports."
The problem is that it doesn't work at all and got the syslogs
Debug on ASA shows
ASA5510(config)# nat: untranslation - outside:20.20.20.11/21 to inside:10.200.200.2/21
nat: untranslation - outside:20.20.20.11/21 to inside:10.200.200.2/21
nat: untranslation - outside:20.20.20.11/21 to inside:10.200.200.2/21
nat: translation - outside:20.20.20.252/37924 failed - port is not found in xlate(0-0)
[code]....
To make it work I need to modify the nat rule to sth like this (translate source of client to inside inteface of ASA) nat (outside,inside) 1 source static any interface destination static NATED-11 REAL-2 service SRV-FTP SRV-FTP / why its not working in the first place? aaa I forgot to mention that both modes of FTP were tested (passive and active)
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Mar 10, 2012
Trying to translate telnet for switches to the outside ip address at some random ports.
172.16.200.2:23 -> 10.199.199.2:2300
172.16.200.3:23 -> 10.199.199.2:2301
172.16.200.4:23 -> 10.199.199.2:2302
etc....
ASA 5510 running 8.4(3):
interface Ethernet0/0
nameif outside
security-level 0
ip address 10.199.199.2 255.255.255.248
interface Ethernet0/1.200
vlan 200
nameif inside
security-level 100
ip address 172.16.200.254 255.255.255.0
[code]....
I can not access the switch at 10.199.199.2:2301 . What am I doing wrong? Or should cleaning toilets be something I really should look at! Now if i run this NAT statment:
object network Switch_TN
nat (inside,outside) static 10.199.199.3 service tcp telnet 2301
I am able to access the switch at 10.199.199.3:2301
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Mar 6, 2013
I have a server on the inside of my network (with a internet Routable IP). It has been requested to me that people from the internet access port 80, and that is translated at the firewall to port 7080. I have set up a temp Access rule to allow access to 7080 from the outside and it is accessable. I am not sure what I am doing wrong, but I am tion from 80 not able to get the translato 7080 to work.
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Jun 1, 2011
I have ASA 5510 and public FTP server from my local network to external IP address, with static nat translation. All works, but I need request to ftp come from internal ASA interface (need use gateway different ASA). How configured ASA for forwarding request?
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Mar 17, 2012
i wounder why i'm getting such log message whenever i'm trying to reach my remote site: No translation group found for tcp src outside XXXX dst dmz ZZZZ, i have a Cisco PIX515E firewall and that message is captured there, the traffic is going through a VPN tunnel (the VPN are up on both ends)
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Dec 20, 2012
Recently upgraded to an Asa 5512x from a pix 515e. I have an Ipswitch secure MoveIT server on the dmz1 interface that needs to be accessed from both the inside and outside interfaces. I have setup a static nat from the outside to the dmz1 and it works, I can also connect from the inside interface. Now I need the MoveIT server to access the DNS server and email server on the inside interface so it can send notifications. On the pix I just created a static from the inside to the dmz1 using its own IP address - static (inside,dmz1) 192.168.1.7 192.168.1.7 net mask 255.255.255.255. I would then add the access-list to allow. How would I set this up with the Asa 8.6 commands?
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Dec 4, 2012
I am having an issue with a specific server that is not reachable from other sub nets. Every other device on the same sub net as the server is reachable via the other sub nets. This server is special because it's NAT'd to an external IP address and has several site-to-site VPN's set up. The firewall is a Cisco ASA 5510.
This is the error I see on the ASA syslog when I try to ping the server from another sub net: 3 Dec 05 2012 10:58:49 10.0.15.101 regular translation creation failed for icmp src inside:10.0.20.8 dst inside:10.0.15.101 (type 0, code 0)
The problem server is on sub net 10.0.20.0/24 and the server IP address is 10.0.20.8. Every device on the 10.0.20.0/24 sub net can hit the server, but devices on other sub nets cannot. For instance, a device on 10.0.15.0/24 cannot reach 10.0.20.8, but can reach other devices on 10.0.20.0/24.
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