Cisco Firewall :: 5520 NAT Control Is Disabled
Jun 28, 2012
ASA 5520
version 8.2
My client has the inside network on interface gig0/1.100 and the guest network on gig0/2.200. The whole 10.77.1.0/24 network needs to be able to reach the server with IP 10.47.47.80 using HTTP. The access list is in place ont the guest interface to allow traffic to the server. The problem is that when I do a packet trace to see the traffic flow, it is dropped on a NAT rpf-check. NAT control is disabled. [code]
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Jan 31, 2012
In the latest code, is VPN still disabled when using contexts? If you use a 5520 as an ISP based firewall for customers, then what would be used for VPN access? Also how many contexts does a 5520 support, and would putting 2 interfaces into an etherchannel for inside, and 2 for outside work? Reason I ask about that, the inside and outside would connect to 2 different core routers. I would be for an MPLS setup.
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Oct 4, 2012
I have an ASA 5520 in my company which does all our NAT and Firewall access control. Currently there is a rule in place to allow an incoming connection on port 2222 from a specific ip address to allow access to a web app our developers created. This is a test before the web app is released live. Now the web app can communicate with the specific address and port but the incoming connection on port 2222 isn't getting through. Everything looks great in the firewall but how can I log any hits this ACL takes to identify any potential problems?
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Dec 11, 2011
I have setup clientless SSL VPN on my ASA. User authentication is done by RADIUS using ACS 5.2, I have created two portal one for IT department and the other for auditing department but the user in auditing if the select IT group from the drop down list they can login to it, my question is how can I make them login to their group only and prevent them from accessing other groups ?
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Mar 13, 2011
I am configuring an ASA 5520 for VPN access. Authorization & Authentication use an LDAP server. I have the tunneling configured successfully, and I can access internal resources. What I want to do now is to restrict access to a specific AD Group membership. In the absence of that group membership, a user should not be allowed access to the VPN.
My test VPN client software is Cisco Systems VPN Client Version 5.0.05.0290. The group authentication is configured into a Connection Entry that identifies the Tunnel Group. I think I worded that correctly.
The Software Version on the ASA is 8.3(1).
My current challenge is getting the VPN to stop letting every access request through regardless of group membership.
[URL]
The configuration (AAA LDAP, group policy, and tunnel group) is below.
aaa-server LDAP protocol ldapaaa-server LDAP (inside) host x.x.y.12 server-port 636 ldap-base-dn dc=domain,dc=com ldap-scope subtree ldap-naming-attribute sAMAccountName ldap-login-password ******** ldap-login-dn
[Code].....
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Feb 24, 2011
I have disabled Unicast RPF on a Cisco ASA 5510 for one specific interface. However, how do I verify that RPF indeed has been disabled on that particular interface? It doesn't show up in the config, neither does it up when I issue the command "sh int interface'.
To disable the RPF feature, I issued the following command: no ip verify reverse-path interface interface_name
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Mar 1, 2011
I am having problems with the Cisco VPN Client software version 5.0.07.0290 installed on a Windows 7 x64 Client.When attempting to connect through the VPN client I am being prompted with the following error: [code]
The client did not match the firewall policy configured on the central site VPN device. Cisco Systems Integrated Client Firewall should be enabled or installed on your computer.
The backend infrastructure used is a Cisco VPN 3000 Concentrator which has a Cisco PIX 525 Firewall.When the Firewall is disabled, the connection is made with no errors. But obviously, this is not good practice.The problem seems to lie with the Local Client Firewall?
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Jun 24, 2012
I am trying to configure two inside interfaces without NAT. I am not using nat-control and I have added exemptions for the two networks. I can communicate between the two networks and to the Internet just fine.I would like to verify that NAT is disabled between the two interfaces. I also need to make sure that the Interface IP (specifically for the traffic from inside-test to the inside network) is not added to packets between the two networks. I would like to be able to verify this as well. In other words I need to have the Source IP address from the originating connection on the inside-test network passed along through to the Inside network device without being replaced by the Interface's IP address. This is a test config for a production environment that will be using a load balancer. The config I have may be working in this regard and the load balancer may be replacing this IP address (that is what I am trying to test), but I am not certain.So far I have the following NAT related running-config command (in regards to these two interfaces):
access-list NAT_Exempt extended permit ip 192.168.12.0 255.255.255.0 interface insideaccess-list NAT_Exempt extended permit ip 192.168.3.0 255.255.255.0 interface Inside-testaccess-list NAT_Exempt extended permit ip 192.168.12.0 255.255.255.0 192.168.3.0 255.255.255.0access-list NAT_Exempt_2 extended permit ip 192.168.12.0 255.255.255.0 interface insideaccess-list NAT_Exempt_2 extended permit ip 192.168.3.0 255.255.255.0 interface Inside-testaccess-list NAT_Exempt_2 extended permit ip 192.168.3.0 255.255.255.0 192.168.12.0 255.255.255.0
nat (inside) 0 access-list NAT_Exempt_2nat (inside) 1 0.0.0.0 0.0.0.0nat (Inside-test) 0 access-list NAT_Exemptnat (Inside-test) 1 0.0.0.0 0.0.0.0
global (outside) 1 interfaceglobal (Inside-test) 1 interface
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Aug 26, 2011
I'm a bit confused about new NAT functionality in Ver 8.4(2). I've gone through all the documentation as well as different blogs but still not clear about the various things.One of these is NAT-CONTROL. I understand that this has now been removed. Does this means that traffic traversing the ASA doesn't need any NAT'ing commands unless specifically required by the administrator? In other words by default traffic is allowed through the firewall without any NAT'ing.
My Second Query
I've ASA5520 running ver 8.4(2). For inside interface, I've created 13 x sub-interfaces under Gi0/1. All have same security level i.e. 100. What I want to achieve is that:Traffic from these sub-interfaces should be NATTed to outside interface when going to internetBut, intra sub-interface traffic should be allowed without NAT'ing. I'm using RFC1918 on both sides i.e. source / destination The first point is not a problem it's working, however. I'm struggling with the second point. On ver 8.2, it wasn't a problem, I used NAT 0 with access-list permitting RFC1918 addresses as source and destination.
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Feb 21, 2013
I am in a process of replacing the Cisco ASA 5510 with 7.3 OS with a new Cisco ASA 5515X with 8.6OS. In the existing Cisco ASA 5510, we have configured 'no nat-control' for which the traffic from all sub-interfaces were flowing to the lower security interfaces without any NAT command. Just access-lists were configured. Now how do i acheive the same in the Cisco ASA 5515X with 8.6? I do not find any 'no nat-control' command available for it.
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Nov 19, 2011
ASA5540# sh run nat-control
no nat-control
this means higher security can talk to lower security without NAT rules
Question 1) - if I want higher security zone to to talk to lower security with NAT rules. I would use statements like below. Am I correct?
nat (dmz) 1 0.0.0.0 0.0.0.0
nat (inside) 1 0.0.0.0 0.0.0.0
global (dmz) 1 interface
global (inside) 1 interface
Is this correct? So in this case I am kindly of like overriding the no nat-control statement ...right?
Question 2) - Now I have no nat-control enabled. Would the below statements (nat 0) be of any use for NAT exemption??
nat (dmz) 0 access-list dmz-nonat
nat (inside) 0 access-list dbase-nonat
And do I have to have a global statement for NAT 0 ...like below?
global (dmz) 0 access-list dmz-nonat
global (apps) 0 access-list dbase-
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Jan 14, 2013
I have a client that is running an ASA5512-X. When I initially installed it, they were having issues sending out emails. I disabled ESMTP inspection and thought it resolved the issue. Recently, they upgraded to Exchange 2010 and are still having an issue with some emails getting hung up in the queue. If I watch the ASA when they try to telnet to the external mail servers that do not work, they get a SYN timeout.
I am not sure why this would happen since ESMTP is disabled. They are running 8.6(1) on the ASA.
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Jan 16, 2012
I have disabled windows firewall in Windows 2003 server control panel but only few ports are shown opened when i scanned with advanced port scanner why other ports are closed.How to open the closed ports?
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May 28, 2012
We have an internal DNS server that all internal hosts do lookups to .. these requests are forwarded onto open dns for anything the dns server isnt authoritative for.. My question is we have purchased the botnet filter and this requires the asa5505 dns client to be active on at least one interface .. Should i point the asa dns to an external IP such as 8.8.8.8 and apply DNS enabled on interface outside ( am using asdm) I don't want the ASA to control DNS for our internal clients we already have a internal server for this, i DO want the asa5505 to check dns packets against its botnet filter, whilst still using open dns for forwarding.
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Aug 10, 2011
Is it possible have Content Security and Control Security in a ASA 5585-X? I´m asking because the CSC-SSM is only supported in ASA 5540, 5520 and 5510 and I dont know how it feature ca be supported on a new ASA 5585-X.
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Aug 23, 2011
Using a Mac running Mac OS X 10.6.8 with VPN Tracker 6.3.0.Before switching to the WAG320N I had no issues with my IPSEC VPN client. After the switch it consistently fails in Phase 1 negotiation.In the log file of the gateway I only notice: Mon, 2011-08-22 07:47:31 - [Outgoing] UDP Packet - 192.168.1.100:500 --> IP.ADDRESS.VPN.GATEWAY:500.The software itself complains about timeouts while contacting the remote gateway.VPN pass through is enabled, no port forwarding is set up, firewall is disabled.
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Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
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Jan 20, 2013
We have a data center with servers set up for different projects, some servers from partner companies and several small LANs. The traffic between all those needs to be controlled and firewalled. The servers and LANs are divided into different subnets and VLANs. Physically, their traffic is aggregated on a couple of 4506 and then sent to a FreeBSD server, where the logical gateways are set up and traffic is filtered between them.The BSD server is dying and having it there is incorrect in the first place, so we are planning to replace it with two ASA (5520) in failover.The question that arises is how to correctly implement firewalling between VLANs. Originally we thought to set up the firewalls in transparent mode and logically terminate VLANs on a stack of 3750 switches behind them, but would that filter the traffic between the VLANs? Then we thought to perhaps terminate the VLANs on the ASAs, use routing mode, and do filtering there, as well. Or should we implement multiple contexts? We have about 20 VLANs and all of them differ in rules of what should go there. None of this can be concidered an "inside" - trusted - zone, nor "outside". Internet and external links are connected and filtered in a different place.
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Oct 1, 2012
I have read that nat control is no longer exist in this version,However, I am trying to permit traffic from lower security interface to higher interface security,Is it need to be Natted ?
When I try to route, i have never succeeded, but when I put a nat, I can access and the traffic go through Do I miss anything on the nat control statement ?
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Sep 20, 2012
I would like to know about asa 5500-x. Does it supports application visibility and granular control for different applications. Moreover bandwidth control based on different users and different applications
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Mar 19, 2013
I'm currently working on setting up 2 ASA 5510's with redundancy/failover. I'm not an expert when it comes to the ASA's so I'm not 100% sure if I can do what I need to.I have 2 inside networks that need to remain separate, a DMZ network,and an outside network. Since each network connects via ethernet to one of the 4 ethernet ports on the ASA 5510's, all 4 ethernet ports on the ASA 5510 will be in use. If I wanted to setup one firewall as Active and the other as standby, how would I go about doing that? Do I need a direct ethernet connection between the 2 firewalls to use something such as HSRP? Or would the Standby firewall be able to tell if the Active firewall is OK since they would both be connected on each of their interfaces to the same networks?
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Mar 20, 2013
I have to upgrade to an ASA 5510 CSC, and the new license is generated, the file you sent me licensing, only seen this:Activation Code not required for this renewal. Please go to "Administration> Product License" in the CSC SSM console and click "Check Status Online" to get the latest expiration date (BASE: 09/04/2014, PLUS: 09/04/2014).This means that what I have not make any upgrades or license charge in the ASA? Does the automatic update is made?
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Nov 7, 2012
I have an ASA pair configured to replace a router that hosts a collection of IPSec Tunnels. Tunnels appear to work. I am lab'ing some additional controls that I would like to implement. On the Production Router that i plan to replace with the ASA's the current Tunnels are all wide open (all traffic allowed to pass). I was hoping to lock things down a little without having to reconfigure all of the Tunnels. My though was that an ACL on the Inside Interface blocking selected traffic Out (so into the LAN) should not impact the stability of the Tunnels but allow me to restrict some traffic from entering the LAN. One port that I was attempting to block is RDP 3389. When this ACL is applied to the inside interface it does not block Port 3389 at all. What am I missing? Is it that the trffic is being allowed because it is coming through one of my 'open' Tunnels?
Shouldn't IPSec Tunnel traffic be processed by the Inside Interface ACL just like all other traffic?
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 3389
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 135
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 137
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 138
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 139
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 445
access-list 145 deny tcp 192.168.30.0 0.0.0.255 10.187.10.0 0.0.0.255 eq 389
access-list 145 permit ip any any
ip access-group 145 out interface Internal
This work great on a 2821 Router, but not so much on the ASA.
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Oct 28, 2012
can i set what websites I want to kid to have access to on a belkin N759 N+ router
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Jun 26, 2012
I have set up a zone-based policy firewall with HA on two 2911 routers as per the Cisco security configuration guide, for an active/passive LAN-LAN cluster. All works as expected, but there is one problem I find: when the control link between the two devices fails, they go into an active/active state as each member assumes it's the last surviving member. The ARP entries for the Virtual IPs on the neighboring devices point to the device that last claimed the active role (usually the standby device). This works in a way, just sessions don't get synched anymore (control link is the same as data link). Now when the link comes back up, the preemtion works and the active, former standby device goes back to standby. But the ARP entries on the neighboring devices still point to the standby device and nothing goes (also sessions established during the active/active state are lost due to resync with the now active member).
This is a single point of failure and what I need is a way to mitigate that. Under:
redundancy
application redundancy
group 1
control <interface> protocol 1
only one control interface is allowed. Other manufacturers with similar functionality provide for the possibilty of a backup control link, for example the internal LAN interface or a dedicated backup link.
How would I go about that? Maybe use a port-channel for the control/data link (but I'm out of interfaces)?
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Feb 27, 2013
I'd like to see some REAL LIFE comparisons of ASA firewall throughput (a bit like this one for ISR G2 Routers - [URL].
The reason I ask is that I recently upgraded a firewall from an ASA5505 to an ASA5520 on a small network where the only outside connectivity was a single 10meg Internet circuit with an IPSEC VPN (not landed on the firewall but on a router) to another site.
When I swapped out the firewall the users noticed a big improvement. The firewall is not doing anything out of the ordinary - no IPS or VPN, just standard state full inspection.
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May 5, 2013
I have an asa 5520. How would I configure my dedicated management interface to be able to route off subnet while the firewall is in transparent mode?
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Nov 26, 2012
ASA 8.2(5), uauth absolute timeout is disabled and inactivity timeout is set to 48 hours:
timeout xlate 48:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:00:00 absolute uauth 48:00:00 inactivity
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
Users still get kicked out every 8 hours and they have to reauth. This is a logging message:
%ASA-5-109012: Authen Session End: user 'john', sid 839, elapsed 28801 seconds
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Jul 26, 2012
We are using the newest release of AD Agent (1.0.0.32.1, built 598). The ASA Firewalls 5520 are having the software release 8.4(3)8 installed.When somebody tries to connect thru the Identity based firewalls from a citrix published desktop environment (PDI) the connection is not possible. Checking the ip-of-user mapping on the firewalls (show user-identity ip-of-user USERNAME) mostly doesn't show the mapping of the USERNAME and the PDI the user is logged in. The user-of-ip mapping of the PDIs IP-address shows mostly other users, which then are used to authenticate the acces thru the firewalls.
What is interesting, that on the AD Agent using "adacfg.exe cache list | find /i "USERNAME"" i can't see the PDIs IP-address neither because it is mapped to another user.Is Citrix Published Desktop environment supported to connect thru Identity based Firewalls? How AD Agent, Domain Controllers and Firewalls are working together? On the firewalls with "show user-identity ad-agent we see, the following:
-Authentication Port: udp/1645
-Accounting Port: udp/1646
-ASA Listening Port: udp/3799
Why Cisco does use 1645 and 1646 and not 1812 and 1813?The Listening Port is used for what purpose? we tried the AD Agent modes full- download and on-demand with the same effect.
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Apr 15, 2013
I try to launch a LAND Attack against my firewall ASA 5520. Everything will work fine. But why, I think it should not work. I use a little tool where I can user a spoofed address, with a cluster shell and attack the firewall interface with the source of 127.0.0.1 ore the ip address of the interface as the source and destination. Then I get a cpu load of 89% with only two host. With IP tables I can use kernel processes to prevent this. But I don´t find anything for ASA.
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Jan 4, 2012
Two different WAN links get connected to the firewall via two routers.(Different ip subnets).I need to get this two wan streams seperatly to the core switches.Core switches sits.Active/Stanby senario. If the Active core goes down Stndby Core will have take over the traffic. My design is correct ,if not what do i need to change. ASA is 5520.
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May 22, 2013
I have ASA 5520 installed. I want to use ntp server for firewall clock setting. I found one open-access ntp server (stratum 2) in Los Angeles:
[URL] 209.151.225.100
Can I use the following command to set ntp server?
ntp server 209.151.225.100 source outside.
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Jan 1, 2012
communication between 2 vlans.i have 2 vlans
Vlan 100
ip add 1.1.1.1
!
!
!
Vlan 200
ip add 2.2.2.2
i want to make communication between 2 vlans on firewall 5520 ASA 8.2.
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