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Network Rare
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In EVE-NG- IOS In GNS3 & EVE NGABOUT US



HOME


ASA BASICS



ASDM

ASDM provides the GUI (Graphical user interface) to configure and manage the
ASA. After enabling the ASDM we can use it in two different ways. 1. through
accessing in browser. 2. through installing application on desktop. If we want
to access through application then we can download it from ASA when first time
accessing the ASDM through browser.

ENABLING ASDM

 1. Check the ASDM bin file into flash (show disk0:) if is not present then
    upload it.
 2. After that tell to ASA which ASDM file will be use.
    ASA1(config)# asdm image disk0:/asdm-731.bin
 3. Enable the HTTP. By default it is disabled.
    ASA1(config)# http server enable
    hostname(config)# http server enable 443
    NOTE: Port 443 is the default port for ASDM. If you want to change this port
    number then you can do it. If you are changing the port number for ASDM then
    you have to use this port number in your URL when you are accessing the
    ASDM. Example, if you change the port number to 444, Then enter the
    following: https://10.1.1.1:444
 4. Restrict the access (We should restrict the access. Here I have allowed the
    full subnet of /24 but in real environment you should use only particular IP
    addresses for the hosts, from which you want to access the ASDM)
    ASA1(config)# http 192.168.1.0 255.255.255.0 INSIDE
 5. Configure the username and password
    ASA(config)#username cisco password cisco privilege 15
 6. Now we can access web page from browser or through ASDM-IDM Launcher
    application
    https://192.168.1.254



SECURITY LEVEL

Security level indicates how we trust an interface , comparing to other
interfaces. A interface with high security level is more trusted then a
interface which having lower security level. On ASA, we defines each interface
with a security level and interface with security level acts like a zone.

By default, ASA not follow the zone concept. Zone is the concept of PALO ALTO
and Checkpoint etc.
An interface with a high security level can access an interface with a low
security level. But interface with low security level is not allowed to access
an interface which is having high security level. If it is required then we can
configure ACL for allow the traffic from low security level to higher security
level.



But reverse traffic from lower security level to higher security level will be
allow. Means, if we are sending a packet from INSIDE (Higher Security Level) to
OUTSIDE (Lower Security Level) then reply packet will be allowed automatically.
because ASA maintains session / connection table.


By default, Communication between two interfaces of same security level is also
not allowed. If it is required then we can allow it using the command
ASA(config)#same-security-traffic permit inter-interface

NOTE: If you are one who is still confused with security level then you can
understand it in the way of water flow. Water always can flow from higher place
to lower place but it can’t flow from lower place to higher place and same is
with ASA security levels.




If we we are giving the name INSIDE to a interface then security level will be
set to 100 automatically and if we are giving the name OUTSIDE to a interface
then security level will be set to 0 automatically. But we can change it if we
want.
Security level can be set between 0 and 100.


Example: Below example is showing that traffic can move from higher security
level to lower security level

INSIDE interface configuration
ASA1(config)# interface gi0/0
ASA1(config-if)# nameif INSIDE
INFO: Security level for “INSIDE” set to 100 by default.
ASA1(config-if)# ip address 10.10.10.254 255.255.255.0
ASA1(config-if)# no shutdown
Or
ASA1(config-if)# security-level 100

OUTSIDE interface configuration

ASA1(config)# interface gi0/1
ASA1(config-if)# nameif OUTSIDE
INFO: Security level for “OUTSIDE” set to 0 by default.
ASA1(config-if)# ip address 192.168.0.1 255.255.255.252
ASA1(config-if)# no shutdown
Or
ASA1(config-if)# security-level 0

NOTE: write erase command is used to erase the configuration. ASA doesn’t
support erase startup-configuration command.



FACTORY DEFAULT

The factory default configuration is available only for routed firewall mode and
single context mode.

ASA(config)# configure factory-default 192.168.1.1 255.255.255.0
Based on the management IP address and mask, the DHCP address



pool size is reduced to 253 from the platform limit 256





WARNING: The boot system configuration will be cleared.
The first image found in disk0:/ will be used to boot the
system on the next reload.
Verify there is a valid image on disk0:/ or the system will
not boot.

Begin to apply factory-default configuration:
Clear all configuration
Executing command: interface management0/0
Executing command: nameif management
INFO: Security level for “management” set to 0 by default.
Executing command: ip address 192.168.1.1 255.255.255.0
Executing command: security-level 100
Executing command: no shutdown
Executing command: exit
Executing command: http server enable
Executing command: http 192.168.1.0 255.255.255.0 management
Executing command: dhcpd address 192.168.1.2-192.168.1.254 management
Executing command: dhcpd enable management
Executing command: logging asdm informational
Factory-default configuration is completed




15 THOUGHTS ON “HOME”

 1.  Avon February 20, 2020
     
     neural
     
     Reply ↓
     1. admin Post authorFebruary 20, 2020
        
        Hi Avon, My apologies if you have faced any difficulties. We are just
        under construction face as well as we are looking for suggestions. so
        please feel free for share your feedback. It will be helpful for us.
        
        Regards,
        Admin
        networkrare.com
        
        Reply ↓
        
     
     
 2.  Dalibor Harald July 31, 2020
     
     i read most of blogs. great job
     
     Reply ↓
     
 3.  Travisdrype August 2, 2020
     
     good but it will more helpful if you will share articles on new
     technologies
     
     Reply ↓
     
 4.  Royal CBD August 2, 2020
     
     Hello my loved one! I want to say that this post is awesome,
     great written and include approximately all vital infos.
     
     Reply ↓
     
 5.  Royal CBD August 6, 2020
     
     Highly descriptive blog, I enjoyed that bit. Will there be a part 2?
     
     Reply ↓
     
 6.  JamesAxomy August 15, 2020
     
     please keep sharing on ASA. i know its now legacy but still in demand
     
     Reply ↓
     
 7.  Jeremy Kennedy August 20, 2020
     
     Good work !
     
     Reply ↓
     
 8.  Jimmy Scowley August 21, 2020
     
     please also upload the post on sadwan
     
     Reply ↓
     
 9.  Janiffer August 25, 2020
     
     I have read this article and if I could I want to suggest you some
     attention-grabbing things or tips. Perhaps you can write subsequent
     articles relating to this article. I wish to learn more issues
     approximately it!
     
     Reply ↓
     
 10. Jimmyput August 25, 2020
     
     excellent
     
     Reply ↓
     
 11. DelorisLoalt September 7, 2020
     
     could you share the study material on BGP ?
     
     Reply ↓
     
 12. sugar daddy September 14, 2020
     
     You cover more useful information than I have seen elsewhere. Please could
     you share your sourceexperience with us?
     
     Reply ↓
     
 13. lucy September 14, 2020
     
     Fantastic !
     
     Reply ↓
     
 14. Lindsay Johnson September 16, 2020
     
     Hi,
     
     I hope you are doing well.
     
     I want to contribute a guest post article to your website that may interest
     your readers.
     
     Reply ↓
     


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