Cisco Firewall :: ASA5520 / How To Use Network Object NAT To Perform Regular Dynamic PAT And Identity NAT

Jun 19, 2011

this is ASA5520 associate with 8.4(1). very simple scenario , three ports: inside . outside . DMZ my problem is how to use network object NAT to perform Regular Dynamic PAT and Identity NAT.

for example, this is my configuration

**** first i configured Regular Dynamic PAT****
object network myinside
nat (inside,outside) dynamic interface 
**** then , i met problem when i want to make identity NAT between inside and DMZ****
**** if i add below CLI , the first nat line will be replaced ****
**** SO IF I ADD THIS****


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Cisco Firewall :: Regular Dynamic PAT Statements In ASA 8.3?

Feb 19, 2012

have 2 inside networks:
object network INSIDE_10.6
object network INSIDE_192.168
I grouped these 2 into 1 object-group:
object-group network INSIDE
network-object object INSIDE_10.6
network-object object INSIDE_192.168
Public IP address used for PAT:
object network PAT
host 152.x.x.x
I used the following statement to create Dynamic PAT to public IP address:
object network INSIDE_10.6
nat (any,any) dynamic PAT
object network INSIDE_192.168
nat (any,any) dynamic PAT   
Is that correct? Also I'm using one public address to PAT both inside networks. Is there any dvantage of using 2 different ones, so each inside network would be PAT to its own address?

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Cisco Firewall :: ASA5520 Use Management Interface As Regular

Oct 16, 2011

i have a Cisco ASA 5520 8.4(1) with a ASA 5520 VPN Plus license
i want to use the management interface as a regular interface (using the no management-only command)is this interface a Gig interface as well ?

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Cisco Firewall :: 5520 - Object-group With Network-object Containing IP Address Range

Apr 7, 2013

Does the ASA treat an object-group with a network-object containing a range of IP addresses as a netmask? For example, I can apply this configuration without the ASA throwing any errors though the configuration calls for a 'net mask':
object-group network test
network-object-group mode commands/options:
A.B.C.D  Enter an IPv4 network mask
sh run ob id test
object-group network test
I found that in the documentation it requires a netmask as oppose to a range. Is this a bug in the code? I am running code version 8.0(5)23 on a 5520. If this is not a bug how does the ASA treat this type of configuration when applied to an access list? When I ran a quick packet trace and denied access from that range it looks like the ASA doesn't read that configuration properly.

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Cisco Firewall :: Access List Object Name Substitution ISR871 And ASA5520

May 10, 2011

I am troubleshooting a s2s vpn between an ISR871 and my ASA5520 and I suspect a problem with my crypto-maps.
Is there a way I can display an access-list on the ASA and have the object names substituted with their IP addresses?

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Cisco Firewall :: ASA5520 9.0(1) - SDM Screen Shot Of Dynamic NAT Entry?

Nov 18, 2012

I have an asa5520 runing 9.0 that I want to setup for simple NAT, i,e on the outside on the inside with dynamic NAT outbound. The new IOS has thrown me for a loop.. I have everything working except the NAT. Any SDM screen shot of the Dynamic NAT entry? even if the IP's are different, I can figure it out...
Also, is there a way to make the unused ethernet interfaces gig0/2 and 0/3 into switch ports on the internal net? (or VLAN like you could do on the 5505)?

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Cisco Firewall :: ASA 8.4 Network Object NAT Ordering

Aug 19, 2012

There is something wrong with the ordering of our NAT-rules.We are running ASA Version 8.4(2)8 and the nat config is pasted below.
I want outgoing smtp-traffic to be translated to xxx.yyy.zzz.18, but instead it's translated to xxx.yyy.zzz.20 (the outside-interface address).The same goes for ftp-traffic, according to packettracer this is also translated to the xxx.yyy.zzz.20.
Ciscos manual states that static nat rules takes precedence over dynamic nat but that doesn't seem to work for us. [code]

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Cisco Firewall :: 5510 - Create Network Object For IP To NAT Through? 

Jan 30, 2012

I have recently upgraded my ASA 5510 to 8.3 code and honestly I am confused on the best and most efficient way to do many nat translations through it.  I have a group of about 100 IP's that need http/https/and sqlnet allowed through for our web farm.
I have a text file with the real and translated IP addresses and in 8.2 I could simply modify it and dump the thing in and make the NAT rules and access-lists.  Now with the new object based model I am having a hard time wrapping my brain around how to do this using as few lines of code as possible.
Do I have to create an network object for each and every IP i want to nat through? 

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Cisco Firewall :: Command Authorization In ASA 8.4 For Object Network

Apr 28, 2012

I just tried to do a quick privilege level setup for a user to limit access to asa. User should be able to add nat's to configuration.ASA 8.4 is in question and trying the following does not seem to work:

privilege configure level 3 command object,gives me ,ERROR: specified command 'object' not found in any mode.It looks like localy this cannot be done or I am doing something wrong?

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Cisco Firewall :: Object Group Network Limit With Asa 5510

Oct 29, 2012

We have Cisco ASA 5510, I am about to add another 2 Objectgroup network  groups on the firewall to our already growing list. Under this Object-group Network xxxx , we are planning to add about about 500 network-object host . This objectgroup will then be applied to an ACL. Just wanted to know if thats possible - meaning addnig 500 hosts? If it is whats the limit?
Also are there any other things to keep in mind before i go-ahead with this huge object group?

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Cisco Firewall :: ASDM 5.0.7 Creates Duplicate Network Object Groups

Aug 5, 2011

We are facing the problem in ASDM 5.x creates duplicate network object groups in the configuration when PIX with software 7.0.7 is used.
Audit report its showing below commands :
asdm group SALES_ref dmz2 reference SALES object-group network SALES_ref network-object network-object network-object
no access-list dmz2_access_in extended permit tcp object-group Network_10.10.1.0 object-group SALES object-group SALES_Ports access-list dmz2_access_in line 200 extended permit tcp object-group Network_10.10.1.0 object-group SALES_ref object-group SALES_Ports
i was created SALES object group 2 month back after that ASDM Automatically created the duplicate object with SALES_ref name and changed the old ACL.

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Cisco Firewall :: ASA 5520 - Create Network Object For Range Of Hosts?

Oct 25, 2011

I'm migrating our network objects from our current firewall to a new ASA 5520 configuration. I'm using ASDM 6.4 for configuration.
We have a range of IP addresses for hosts that we need to add to a firewall rule/ACL. In the previous FW software I could create an object that was a range of IP address. For example there is an object called emailservers that is defined as
Is there a way to do a similar thing on the ASA 5520?
I can see how to create subnets, but in this case I only have a range of IP addresses, no subnet mask.

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Cisco Firewall :: Internet Access Through ASA 5540 For Specific Network Object Group

May 2, 2011

I have a 5540, and i am trying to allow access to internet for an specific network object group, who has inside a bunch of users, who needs direct internet access without any restrictions, i have tried with dynamic NAT, but that configuration ask for a specific IP o a Network range, and is not permitted to configure an  object group as a source
The group is located in LAN zone, so a permission from one zone to another zone is needed i think, but i can allow the internet acess to that group Is there another way to get that , different from NAT ?

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Cisco AAA/Identity/Nac :: 3750x / Dynamic VLAN Assignment For Wired Campus Network

Nov 23, 2012

I`m working on Dynamic Vlan Assigmenton the basis of end user authenticatedwhoc are part of specific AD Group in c ampus enviorment.Objective: Need to assign the vlan on switch port on the basis of authenticated users OU Group in Active Directory. Eg: There are 2 OU groups in AD, Sales and Administration. Authenticated user in Sales group should get Vlan 10 and user in Admininstration Group shoudl get Vlan 20.
Cisco 3750x/Cisco 4500
ACS Version 5.2
Microsoft AD

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Cisco AAA/Identity/Nac :: Use 802.1x To Authenticate Clients On Network With Dynamic VLAN Assignment From RADIUS?

Apr 11, 2013

I'm trying to use 802.1x to authenticate clients on my network with dynamic VLAN assignment from RADIUS. We have IP-Phones(powered by PoE) that only supports EAP-MD5, and we would rather use MAB(it also uses LLDP-MED for some settings) to authenticate the phones using the MAC-range from the phones vendor. The following scenario works perfect:Connect the phone and let it boot up(takes a while) and authenticate with MAB.Connect a computer in the phones data-port and let it authenticate with 802.1x(or fail and reach guest-vlan) However, the following scenario doesn't work:The computer is already connected to the phoneThe phone is then connected to the switch What happends now is that the computer is authenticated using 802.1x before the phone boots up and get's authenticated with MAB. When the phone is ready, it's authenticated with MAB and everything works. However, after a short period(let's say a minute), using `debug authentication all`, we see a "NEW LL MAC: phones mac" message(which is weird since the mac has already been MAB-authenticated), and then we are unable to contact the phone using ping. When I check `show mac address-table` it has now moved the mac from `Port Gi 0/12` to `Port Drop`. However, if I check `show mab interface Gi 0/12` or `show authentication sessions` it lists the phones-mac as `mab auth sucess `.why the first scenario works, and not the second?
The switch is a 3560E PoE 24p with IOS 12.2.58SE2. Sample of the switch-config: network-policy profile 1voice vlan 90!interface GigabitEthernet0/12switchport mode accessnetwork-policy 1authentication control-direction inauthentication event fail retry 1 action authorize vlan 60authentication event server dead action authorize vlan 60authentication event no-response action authorize vlan 60authentication event server alive action reinitializeauthentication host-mode multi-domainauthentication order mab dot1xauthentication priority mab dot1xauthentication port-control autoauthentication periodicauthentication violation replacemabdot1x pae authenticatordot1x timeout tx-period 5dot1x max-reauth-req 1spanning-tree portfast!Btw, when we tried authenticating the phones using 802.1x too (EAP-MD5), there are NO problems in any of the scenarios. However, we want to use MAB instead of 802.1x to avoid the requirement of configuring the phones with a username and password. The RADIUS response was the same when using 802.1x as it is with MAB for the phones (including device-traffic-class=voice AV-pair).

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AAA/Identity/Nac :: ACS5.3 Command Set Regular Expressions

Jul 9, 2012

I am trying to secure changes to switches using ACS 5.3 and allowing our technicians to only change the vlan for user ports on the switches.  How can I use regular expressions to filter out the 1/1/# ports so that those ports cannot be accessed in config mode?  If I allow the following, it allows access to all interfaces with 'gi' in them.

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Cisco Firewall :: ASA5520 Bypass All Network Through Firewall

Dec 22, 2011

With regarding to the firewall ASA5520, i'm using it in my network, all the confiuration are properly configured and working but with the use of proxy address in internet explorer(e.: all the blocked contents as easily accessible simply it bypass all the network through will u guide me to block the proxy servers.

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AAA/Identity/Nac :: ASA5510 Entry For LDAP Object That Refers To Domain Controller

Feb 14, 2013

On our ASA5510 in the area AAA Server Groups, there is an entry for LDAP and an object that refers to our 2003 Domain Controller. This DC has LDAP over SSL enabled and I can see the DN and Password for a domain user account.I've created two new DC's, both R2 2008 but when I enable these in the same way it says it could not authenticate, ERROR auth server not responding, AAA group removed.I thought this had something to do with CA being installed on a DC, but it's not running as a service on the DC that was already referred to.

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Cisco Firewall :: ASA5520 To ASA5520 Via L2L Tunnel

May 31, 2011

Our firewall expert has gone off on long term illness leave and I am trying to pick up the pieces :-(
We have an ASA 5520 (local office) talking to another ASA (remote office) via a VPN Tunnel.
My 1st problem is that I cannot ping from my inside network (local) to the outside interface of my remote ASA.
My 2nd is that I have debug enabled on my rules but am not logging anything.

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Cisco Firewall :: ASA5520 / Can't Stream RTSP Outside Network

Jan 9, 2013

Equipment used:
VBrick Systems Inc., Model HPS 7102 HS-HD
Cisco ASA5520 Firewall
I have been trying to take a vBrick RTSP stream and stream it outside of our network:Inside our network, If I were to open VLC, and go to “Media”, “Open Network Stream” and paste rtsp:// the stream works, audio and video. Outside our network nothing.  I have opened ALL UDP and TCP ports to the vBrick 123.1123.157.10 on our firewall and tried from outside of our network:
access-list access-in extended permit tcp any host range 1 65535
access-list access-in extended permit udp any host range 1 65535
After adding this to the access list, the web gui (uses port 80) and ftp (uses port 21) is functional outside of our network...just not the rtsp stream which works fine internally.

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Cisco Firewall :: ASA5520 Unit Not Accessible On Network For Initial Configuration

Dec 15, 2011

We received an ASA5520-K8 through Cisco's Loan program so we could demo it as a replacement for our aging Cisco 3005 VPN appliances.  Given that we are a non Cisco shop (except for specific appliances like concentrators and wireless access points), I don't have a great deal of experience with Cisco gear.I started to set to setup the appliance this morning but immediately ran into issues.  The 5520 doesnt seem to be acting as a DHCP server, and worse yet, I can't access the unit even if I hard code the IP on the PC being used for configuration.  I have to say that I feel kinda stupid having to post this, since I actually followed the documentation avaiable for this menial task and I fully expect the problem to be a simple one.  Namely, I am using two specific sources of info for connections.

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Cisco Firewall :: Pix 525 Configuration - Regular Or Redundant Interface

Feb 14, 2012

I am configuring a pix 525,i just found out how to activate the subinterface on it so that's good,the box has a primary unit and secondary unit, both are connected from G0 to redundant switches,if i do a show failover, it says it's using the serial based lan failover, which is fine by me,however, do i need to create a single, regular interface.. or a redundant interface?,i.e. if i create a regular subinterface, will failover still apply to this interface?,or for failover to work, do i need to create a redundant interface (with a redundant id)? i do not seem to have the option to create a subinterface when adding a redundant interface.

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Cisco Firewall :: ASA 5510 - Webfilter Using Regular Expression?

Oct 2, 2012

I have a ASA 5510, it does webfilter using regular expression. [URL]
I block "" and it was successfull. But somehow other users is using https to access to FB. how do i filter HTTPS?

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Cisco Firewall :: ASA 5510 - NAT Regular Translation Creation

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 regular translation creation failed for icmp src inside: dst inside: (type 0, code 0)          
The problem server is on sub net and the server IP address is Every device on the sub net can hit the server, but devices on other sub nets cannot. For instance, a device on cannot reach, but can reach other devices on

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Cisco Firewall :: ASA 5510 / URL Paths And Regular Expressions In ASDM?

Apr 2, 2012

I've recently switched to an ASA 5510 on 8.4(3) coming from a Checkpoint NGX platform (let's say fairly quickly and without much warning ). I have a couple questions and they're kind of similar so I'll post them up. I've read docs about regex and creating them both via command line and ASDM, but the examples always seem to include info I don't need or honestly something I don't understand yet (mainly related to defining classinspect maps). If someone could provide a simple example of how to do these in ASDM that would be useful in understanding how regular expressions are properly configured. So here we go.

I know this is basic but I need to make sure I understand this properly - I have a single web server (so this won't be a global policy) where I need to allow access to a specific URL pathfile and that's it. So we'll call it est estfile.doc. Any other access to any other path should be dropped. What's the best way to do this in ASDM (6.4)? I think if I saw a basic example for this I could figure out next few questions but I'll post them as well just in case.

I have another single public web server (again this won't be a global policy) where I'd like to specify blocking file types, like .php, .exe., etc... again a basic example would be great.

Lastly, and this is kind of related, but we have a single office/domain and sometimes we get spam from forged addresses appearing to be from our domain. On Checkpoint I used to use its built-in SMTP security server and could define if it received mail from * to drop it because we would never receive mail externally from our own domain name. I saw something similar with ESMTP in ASDM and it looks kind of like how you set up the URL access mentioned above. Can I configure this in ASDM as well, and if so how?

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Cisco Firewall :: ASA 8.4 DNS Names In Object-groups

Jun 8, 2011

Is it possible somehow to define externally administred DNS namese in ASA 8.4 in within object groups?i know that we can use name XXX, but some idea popped up using this kind of configuration.

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Cisco Firewall :: Object To Twice NAT Configuration ASA5505 8.4?

Dec 18, 2011

We have an ASA5505 that we need to enable hairpinning on.... In the old firmware versions, we used to be able to configure a public to private static mapping along with hairpinning by using
static (inside,outside) outside_ip inside_ip netmask
static (inside,inside) outside_ip inside_ip netmask
In 8.4, if I use object nat, the hairpin functionality works perfectly,
object network obj-insideip
  nat (inside,inside) static publicip
however, since object nat only allows a single nat statement, I was attempting to use a twice nat to enable the hairpin functionality, but have been unsuccessful in coming up with the right combination of parameters for the functionality.
nat (inside,inside) source static private_object public_object destination static public_object private_object
allows hairpinning to successully work from the same machine.  Meaning on any given host, I can ping itself using the private or public ip, but I can't get the right combination for hairpinning from any private host to another private host via the public ip.  Other combinations have yielded icmp responses, however, they specify the private IP as the source of the reply instead of the public ip.

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Cisco Firewall :: ASA 5510 - Block Certain Websites (URLs) Using Regular Expressions

Jan 31, 2011

i have cisco asa 5510 as firewall, i was trying to block some site using the link provided below
and its working fine, but the problem i am having, when i go to download attachment from hotmail its not downloading, from gmail and other mails its

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Cisco Firewall :: ASA 5505 - Regular Translation Creation Failed For Protocol 47 SRC

Oct 10, 2011

We have a PIX with 3 interfaces. Inside, Outside,DMZ.
On my DMZ we have some clients that come in and remotely connect back to there office via MSPPTP. I setup the ASA with this to get rid of the error message: regular translation creation failed for protocol 47 src
policy-map global-policy
inspect pptp
Now when the dmz client tries to connect back to there PPTP server I get the following error. 0 37624 Teardown dynamic GRE translation from dmz: to outside: duration 0:01:30 1069 1723 Deny TCP (no connection) from to flags PSH ACK  on interface dmz 63767 Teardown GRE connection 8393958 from dmz: to outside: duration 0:01:08 bytes [ code]...

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Cisco Firewall :: 5510 Block URLs Using Regular Expressions For Some Clients

Oct 20, 2012

i use ASA 5510 and i want to block some urls :

- to 79 allow every thing
-  to 89 : block facebook , myspace, twiter,
-  to 99 : block facebook , myspace, twiter,  youtube , dailymotion
- to 199 deny everting

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Cisco Firewall :: ASA 5510 Object Groups / Creating New ACL

Jul 20, 2011

I have an ASA5510 where I have defined object-groups and then associated them with a specific ACL.  Our ISP is pulling their point of presence from where I live and I am force to move to a new ISP.  I am in the process of setting up another interface for the ASA5510 to connect to the new ISP.
My questions is can I create a new ACL lets call it new_access_in and use it with the same object groups that I have already defined?  I know that I can only have one ACL bound to an interface, and will bind this new ACL to the new interface I am setting up, but I wasn't sure if I could use the same object groups and connect them to a different ACL.  I really don't want to have to create new object groups if I don't have to.

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Cisco Firewall :: ASA 5510 Object-Groups Not Working

May 9, 2012

I have an ASA 5510 and have just started using object-groups which are super handy in theory, but not working in reality. I have a service object-group with a mix of tcp, icmp, and udp ports. Let's call it Sample_Port_Group. I'm trying to apply it to my dmz_access_in ACL. Here's the line giving me problems:
access-list dmz_access_in extended permit object-group Sample_Port_Group any
The asa throws up an error between and any. When I put up a ? after Sample_Port_Group, it gives me the option of putting in an IP address, any, etc. When I put in a ? after, it only gives me the option of putting in an IP address.URL

Those posts gave me the impression my line was possible, especially the "access-list outsideacl extended permit object-group myaclog interface inside any" line, which is at the end of the 2nd article linked.

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Regular Packet Loss On Wireless Network?

Apr 6, 2012

I am connecting to a Wireless network, through a ZyXel ZyAIR G-4100v2 router. My problem is that I am experiencing very regular packet loss every minute or so. This lasts for around 5-10 seconds on average. I am running XP with the latest service pack. So far, I have checked out;Wireless Zero Config scanning of new stations (disabled that feature).Xirrus network scan (signal is fine and consistent). I am not suffering from any degredation in signal, the problem seems to be that the router is simply not allowing anything through at regular intervals.

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