ASDM problem

http://www.tek-tips.com/viewthread.cfm?qid=1540963

Basic Configuration on Cisco ASA 5520

http://www.security-solutions.co.za/CISCO-ASA-5520-configuration-example.html

The initial configuration of the device has to be done on the Command Line Interface and example of that is included bellow

Hostname domain name and ssh keys generation

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First of all you need to configure the initial settings of the device with a hostname and a domain name in order to be able generate SSH usage keys

hostname test-asa
domain-name test-asa.com
enable password ZdcH9lbXsA2JtS18 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
crypto key generate rsa usage-keys

Management interface

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Then you need to configure the the management interface with an ip address in order to be able to connect to the computer you are managing the device from

interface Management0/0
speed 100
duplex full
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0

Upgrade the Cisco IOS

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Then you need to copy the latest release of the cisco IOS software for the appropriate appliance version from the TFTP server (usually your laptop's ip address here depicted as 192.168.1.100 running a TFTP server that can be downloaded here)

copy tftp://192.168.1.100/asa821-k8.bin flash:

boot system disk0:/asa821-k8.bin

Management Gui Configuration

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Then you you need to configure the ASDM gui management interface of the ASA .Bear in mind once the image file is copied to the flash of the device you also need to enable the http server and enable who is able to access the service

copy tftp://192.168.1.100/asdm-621.bin flash:

asdm image disk0:/asdm-621.bin

http server enable

http 0 0 inside

Basic Static Routing Configuration

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Then you need to configure the basic outside interface parameters as well as routing on the outside interface so you can communicate with the outside world.Once that's done you have to enable the transition of traffic from the inside interface trough a feature called network address translation or NAT.A lot of things have been written about nat i am not going to go trough all of them here suffice to say if you issue the bellow commands the translation will happen and you will be able to establish a bridge between the inside and the outside interfaces.

interface GigabitEthernet0/0
speed 100
duplex full
nameif outside
security-level 0
ip address 196.15.131.202 255.255.255.240

! the bellow command is used to enable default routing on the ASA device using 196.15.131.201 as the default destination to send its traffic to

route outisde 0 0 196.15.131.201

Basic Global Natting Configuration

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The natting feature is basically used on the Cisco ASA as measure of protecting your private network addresses when they are accessing the internet.Its achieved by the bellow commands

nat (inside) 1 192.168.0.0 255.255.0.0

global (outside) 1 interface

More complex Cisco NATing Concepts

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The bellow Section Describes natting order of operation in more detail.Cisco ASA natting is considered one of the most complicated and challenging subjects .If it looks intimidating thats because it is .If you require some assistance with that you can always contact us for more info.

Order of NAT Commands Used to Match Real Addresses
The security appliance matches real addresses to NAT commands in the following order:

1. NAT exemption (nat 0 access-list)—In order, until the first match. Identity NAT is not included in this category; it is included in the regular static NAT or regular NAT category. We do not recommend overlapping addresses in NAT exemption statements because unexpected results can occur.

2. Static NAT and Static PAT (regular and policy) (static)—In order, until the first match. Static identity NAT is included in this category.

3. Policy dynamic NAT (nat access-list)—In order, until the first match. Overlapping addresses are
allowed.

4. Regular dynamic NAT (nat)—Best match. Regular identity NAT is included in this category. The order of the NAT commands does not matter; the NAT statement that best matches the real address is used. For example, you can create a general statement to translate all addresses (0.0.0.0) on an interface. If you want to translate a subset of your network (10.1.1.1) to a different address, then you can create a statement to translate only 10.1.1.1. When 10.1.1.1 makes a connection, the specific statement for 10.1.1.1 is used because it matches the real address best. We do not recommend using overlapping statements; they use more memory and can slow the performance of the security appliance.

Basic Access list Configuration

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Then you you need to configure some access lists allowing certain hosts to access resources on the internet or other connected interfaces on the firewall.Then assign and apply that access group to the inside interface

access-list inside extended permit ip any any

access-group inside in interface inside

Basic Troubleshooting commands enabling

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After that's done you have configured the basic settings on your ASA device .The bellow settings are recommended in order to troubleshoot simple connectivity and other issues you may encounter on the asa device by the ways of logging .The logging functionality on the ASA is extensive and is unparalleled in troubleshooting usefulness in determining where the problem lies .

logging enable
logging timestamp
logging buffer-size 999999
logging buffered debugging
logging trap debugging
logging history debugging
logging asdm debugging
logging facility 23

Viewing the logs on the Cisco ASA appliance

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show logging | include 192.168.1.1

Best Practice management Configuration suggestions

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A best practice would be to configure remote management access to a device by allowing only a few hosts to connect to the Cisco ASA device for remote management as shown bellow

ssh 196.1.1.1 255.255.255.255 outside

ssh verion 2

How to create user using ASDM

http://globalknowledgeblog.com/technology/security/using-asdm-with-minimum-user-privileges/

How to recover password on Cisco ASA 5520

http://humtydumtytechnology.blogspot.com/2009/03/password-recovery-asa-5520.html

Password Recovery ASA 5520

Password Recovery Process for Cisco ASA 5520.

1. Reboot Power
2. When prompted , press Esc to interrupt the boot process and enter ROM monitor mode.You should see a Rommon Prompt (rommon#0> ).
3. rommon#0>confreg (press enter).
4. current configure register should be default of 0x01. Device will ask if you want to make changes to the configuration register.
   Answer : NO
5. You must change the configuration Register to 0x41.
6. rommon#1>confreg 0x41
7. Reset the device.
8. rommon#2> boot
9. Now after booting you will see a general user mode like. ciscoasa>
10. ciscoasa> enable password
11. ciscoasa#
12. ciscoasa#copy startup-config running-config
13. ciscoasa#config t
14. ciscoasa(config)#enable password
15. Reset the configuration to default value 0x01.
16. ciscoasa(config)#config-register 0x01
17. View the configuration register setup
18. ciscoasa#show run startup-config
19. reload
20. ciscoasa#reload
21. System config has been modified,save [Yes][No]
22. press Yes.