Cisco Firewall :: Different Between ASA-5520-K9 And ASA-5520-K8

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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Cisco Firewall :: Upgrade From 5505 To 5520 On Network - ASA Firewall Throughput

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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Cisco Firewall :: ASA 5520 - Routed Management Interface On Transparent Firewall?

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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Cisco Firewall :: 5520 Identity Based Firewall Doesn't Work Using Citric Published

Jul 26, 2012

We are using the newest release of AD Agent (, 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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Cisco Firewall :: Launch LAND Attack Against Firewall ASA 5520

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 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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Cisco Firewall :: 5520 Single Firewall With 2 Core Switches

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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Cisco Firewall :: ASA 5520 - NTP Server For Firewall Clock Setting

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:
Can I use the following command to set ntp server?
ntp server source outside.

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Cisco Firewall :: Make Communication Between 2 Vlans On Firewall 5520 ASA 8.2

Jan 1, 2012

communication between 2 vlans.i have 2 vlans
Vlan 100
ip add
Vlan 200
ip add 
i want to make communication between 2 vlans on firewall 5520 ASA 8.2.

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Cisco Firewall :: ASA 5520 - Corporate Firewall Crash

Feb 27, 2011

I have a serious problem with my corporate firewall, witch is an ASA 5520, fv 8.3, with 8 +1 interfaces. It suddenly started to crash every 10/20 minutes and rebooting alone.
First of all I checked system resources witch are in a very low usage state. I also checked interfaces errors, but nothing strange come out o from error counters analysis. I tried disabling logging and all the service policy rules configured, but nothing changed.
Nothing changed and firewall continue restarting by itself.
Last logs I received before crash were:
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack =
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack =   0x084A619E  0x084A6512  0x084A70E1  0x084A7987  0x084A7AAA  0x08558B9B  0x08558E8A  0x083D3518  0x083CA145  0x080659D1  0x089196D9  0x08919790  0x089FF711  0x08A27468

Here the sh crash info command on module 0, after last reboot:
[Code] ......

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Cisco Firewall :: 5520 Firewall Management Port

Nov 29, 2011

we are having a firewall asa 5520 .we have connected the  management port and inside port to internal network and dmz port to dmz we need to configure tacacs and other management tool on dmz devices through management port. The problem is the management devices tacacs and other are placed in internal network.

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Cisco Firewall :: ASA 5520 - NAT And Firewall Access Control

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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Cisco Firewall :: ASA 5520 - VPN Traffic Is Getting Dropped Through Firewall

Apr 8, 2011

Our Local Network is behind the CISCO ASA Firewall.Whenever we are accessing to Client VPN server,it is getting connected but after few Minutes (May be 5/10/30 Min),the sessions are terminating. The same traffic through PIX is no issue , only with ASA Firewall. See the following Error and request you give the possible root cause for this.
2011-04-09 16:15:09    Local4.Info    %ASA-6-302016: Tear down UDP connection 87447908 for OUTSIDE: to inside: duration 0:27:49 bytes 18653

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Cisco Firewall :: 5520 - Firewall Behind Two GLBP Routers

May 29, 2012

I have problem in the configuration of Cisco ASA 5520, IOS version 8.4. The connection is as follows: LAN network--> Firewall --> Routers with GLBP with virtual ip address. the clients can not ping the virtual interface of the GLBP group, but I can ping it from the firewall, and I can ping the clients from the firewall, I checked the packet tracer it gives :
Phase: 7
Type: NAT
Result: DROP
nat (inside10,outside) source dynamic LAN interface
Additional Information:(code)

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Cisco Firewall :: ASA 5520 CPU Utilization Is 100 %

Sep 27, 2011

We have configured 20 route in ASA 5520. The CPU usage goes to 100 % at the moment when we add a specific route.route inside 255. 255. 255.0 1.This is the same case when we add this route at the first cli or as the 10th cli or the 21 cli (errespective of the position of cli) There is an another route out of which 20 routes we have configured is route inside 1.The normal case if we dont add the problamatic route , then the CPU utilization is only 2 %.

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Cisco Firewall :: ASA 5520 With Failover NAT With Two ISP?

Jun 20, 2011

Currently we have one ISP1 and all traffic goes to this way. Suppose our isp1 goes down, our outside user cant get the server. All servers are nated to this ISP1.We planned to purchase a another ISP2. Shall we Configure same inside server to map this ISP2? so that one primary ISP1 goes down it will take place the outside trafficISP2.

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Cisco Firewall :: ASA 5520 Nat Translation Max?

Aug 24, 2012

I am going with ASA 5520, know how many NAT translation is possible.

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Cisco Firewall :: Can Buy Plus License For ASA 5520

Jan 11, 2012

Can i buy a plus license for asa 5520??

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Cisco Firewall :: 5520 / Does ASA Have Open SSL

Mar 19, 2013

On one of our firewalls we hosting a application/service which impacts clients and we recently conducted a Pen test, the external company doing the Pen test have advised us that there is a vulnerability relating to OpenSSL. We have checked the server and there is no OpenSSL installed so the only place where it could be picking this up is on the ASA, is this correct?Here is the report from the company that conducted the test:4.3 Network Security An outdated OpenSSL package was identified that was vulnerable to a heap corruption bug that may be exploited by an attacker to acquire command execution on the host, or to create denial of service conditions. Table 7   provides an overview of the risk identified per network assessment category,   along with recommendations for resolving the issues identified. Category

Patch Management

The OpenSSL package installed   on one host was identified as being outdated and subject to a heap corruption   bug. Update the outdated /  vulnerable OpenSSL package to the latest stable version. We have an ASA5520 and running the following version: Cisco Adaptive Security Appliance Software Version 8.2(5)2 How do we check the OpenSSL on the ASA and secondly do we need to update the ASA software version ?

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Cisco Firewall :: ASA 5520 - How To See Write Log

Aug 5, 2011

I want to see log for write on ASA5520. who & when write lastly and who write before. How to see this log. In show vershon i see last modified date, but not log.

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Cisco Firewall :: ASA 5520 Failover With SLA?

Jul 19, 2011

Is it possible to setup 2 x Cisco ASA 5520 that are in an Active/Standby failover using sla monitoring?
For example ASA1 outside interface connects to an upstream switch and you setup sla monitor with icmp echo to ping that switch. The switch goes down and you need the other ASA2 to become the Active ASA. Can the sla monitor be automatically integrated with the failover commands for this to happen?

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Cisco Firewall :: 5520 Can Get An 8.6 Version

Apr 8, 2012

We want to make an upgrade of one of our customers' ASA 5520 (with failover). They have version 8.2 now and we want to get the more stable newest one. Can we get an 8.6 version? or we need an ASA 5500X for that one?

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Cisco Firewall :: Getting DoS / DDoS On ASA 5520

May 3, 2012

I am currently getting DoS/DDoS on my asa 5520 , the attacker is hitting IP's that are not even open on any port. The attack is filling up the queues on the firewall which is at 99% CPU during the attack. here's the NetFlow info that I was able to get from my ISP ( since I dont have a Router to do that ). [code]

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Cisco Firewall :: Unable To SSH From Outside To ASA 5520

Feb 8, 2012

I am unable to ssh to the cisco firewall from outside. Though when i telnet on port 22, [code] When i do a putty session i get a blank screen.

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Cisco Firewall :: Getting HTTP Behind ASA 5520 (Ver 8.2)

Mar 12, 2013

Two days ago, we changed our old 525 with asa 5520 ( ver 8.2 ). Configuration is the same, except the version. It even retains the same global interface and static public ip address as the old device.All worked well during that period.Yesterday, one of the http applications , not tested other day, was found not to be working. To test, we switched back to the old 525 , however nothing was working when we did that.Does the static statement which actually does the translation for this application carry any arp problems or can i check this problem.

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Cisco Firewall :: ASA 5520 Not Failing Over

Mar 13, 2013

Im preparing a lab and I have 2 ASA 5520's. I have configured them for failover so the Primarys config will replicate over to the Secondary. They are connected via a 3560 switch. the switch ports are configured as access ports on vlan 1. Spanning-tree portfast is enabled
Firewall (Primary) 
Cisco Adaptive Security Appliance Software Version 9.1(1) Device Manager Version 7.1(2)
Compiled on Wed 28-Nov-12 10:38 by buildersSystem image file is "disk0:/asa911-k8.bin"Config file at boot was "startup-config"


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Cisco Firewall :: URL Redirection In ASA 5520

Jul 14, 2011

I am using cisco 5520 for my RAS & site - site VPN's. backbone 6509 --> CISCO 5520--> ISP router with 3 ethenet interfaces.From cisco 5520 there r 2 connections to router, one for sit-site vpn outside interface and the other for RAS outside. I want to configure url redirection on 5520 so that when someone from outside access public IP it should forward it to the server in LAN. I want to use the interface hosting RAS for this.

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Cisco Firewall :: ASA 5520 Upgrade From 8.2(3) To 8.2(5)

Oct 19, 2011

We wish to upgrade 8.2(3) to 8.2(5) on our asa 5520 and 5510. I have been looking for Cisco guides for installation instructions but havent been able to track any. or is it just as striaght forward as copy image, reboot secondary and the primary

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Cisco Firewall :: ASA 5520 - SSL VPN With AnyConnect

Apr 8, 2013

I have an ASA 5520 soft 8.2(3) when i try to configure the any connect I don't get the SSL and the telnet options for the connection. bare in mind that i don't have the any connect software on my asa nor do i have any certificate. is it essential to get a certificate. do i have to buy it knowing that it will only be used by our company's partners. if not how do i get it          

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Cisco Firewall :: Run OSPF In ASA 5520?

Aug 12, 2011

I have 10 different segments in ASA 5520, so i created 10 VLAN in ASA & made the inside interface as Trunk that connects with core switch. Now i need to run OSPF in the ASA.

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Cisco Firewall :: How Many ASA 5520 ACL Limit

Jan 27, 2011

i want to understand ASA 5520 ACL limitation as max ACEs . in FWSM case is following link "rule limits" section. [URL] but in ASA case, I cant find this information. where is this limitation in CCO?

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Cisco Firewall :: Static NAT At ASA 5520?

Aug 9, 2011

I have Static NAT on ASA 5520 for mail server and proxy server. I can use it from internet. now i want to Static NAT for I mean>,> so on.

I want when hit it goes to
just simple static  NAT. which command i need at ASA ? what is GW of pc  ?

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Cisco Firewall :: 5520 - Upgrade Asa 8.25 To 8.4?

Apr 15, 2013

I am trying to upgrade our ASA5520(Primary/Standby) to 8.45. Can i upgrade 8.25 directly to 8.45 or do i have to upgrade to 8.3 first?                  

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Cisco Firewall :: CPU Spike For ASA 5520

Aug 12, 2012

In our ASA 5520 "  tmatch compile thread" process is taking too much CPU while applying ACL for a moment . CPU goes to high and then back to normal .. The code is 8.2(5) . Is this a normal operation or abnormal .

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