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Cisco ASA firewall command line Technical Guide. Working Paper (PDF Configuring trunk link and sub-interfaces between ASA and Switch. There are hundreds of commands and configuration features of the Cisco ASA firewall. The official Cisco command reference guide for ASA firewalls is more. For a more complete practical guide about Cisco ASA Firewall configuration I on your favorite social network below in order to download the PDF instantly. like .
Its important to configure a hostname and domain name since we will use certificates hostname vpnasa domain-name mycompany. The following is created automatically when you generate the self-signed certificate crypto ca certificate chain SELF-TP certificate ff a 0da f7 0d db e e6d79 f6d70 ee f6d31 a 86f70d01 e61 e6d f6d e79 2ef6d ed 5ad32 a d b e e 6df 37 Enjoy.!
Create ikev2 isakmp policy crypto ikev2 policy 1 encryption aes integrity sha group 5 2 prf sha lifetime seconds !
Create ikev1 isakmp policy crypto ikev1 policy 10 authentication pre-share encryption 3des hash sha group 2 lifetime telnet timeout 5 ssh timeout 5 console timeout 0 threat-detection basic-threat threat-detection statistics access-list no threat-detection statistics tcp-intercept ssl trust-point SELF-TP outside! Configure separate tunnel groups for each type of VPN! One important thing to keep in mind is that you must create an AD user account which has the privileges to login. In a regular site-to-site VPN scenario.
It will show how to pass multiple networks inside a VPN tunnel. It disables the mechanism to automatically allow all VPN traffic.
This command is important. One Outside. Also we will impose traffic restrictions to the two Internal Zones. Inside1 users will be allowed to access only Web and Email. All access is banner motd monitored. DMZ dynamic interface 53 Enjoy. Allow ssh from zone inside1 ssh You can therefore deny access to website www. There are a few methods to block access to websites. The second method blocking the IP with ACL will work only for simple websites which have a static IP but it will be difficult to work for dynamic websites such as Facebook.
In our example network below. From ASA version 8. Twitter etc which have many different IP addresses which change all the time.
Block both the www and non-www domains object network obj-www. Create FQDN objects for website we want to block. Flag for inappropriate content. Related titles. Jump to Page.
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I googled around to see if anybody else has experienced this but nothing so far. Anybody has any idea why this might happen? One suggestion would be to fix the speed and duplex settings on your ASA outside interface. Maybe its a hardware speed negotiation problem between the ASA and the cable box.
If the cable box is Mbps full duplex, then make the ASA interface the same:. Hello, I was looking around for a while searching for operational security training and I happened upon this site and your post regarding Configure a Cisco ASA Firewall — Basic Configuration Tutorial CiscoTips, I will definitely this to my operational security training bookmarks!
The scenario that best fits my setup is static outside interface with 2 servers in the dmz. You state that this requires a Security Plus license.
Would I still need a Security Plus license? Would I have to do anything different from your example or just leave out the dmz settings? Please let me know if you need more clarifications. Harris, Thank you! It worked once I configured it the way you had it in the book.
Now I will see how to port forward ssh port to a box on the inside vlan.
For the port redirection I have a specific section in the ebook which describes exactly what you need to do.
Please let me know if you find any problems. It was configure by ASDM so How to reload the firewall,kindly send it the procedure it is really help to me. I have on doubt we the firewall directly connected to my thomson ADSl router modem and then we have one public ip wher i want configure,I think it should configure in firewall e0 port,If we configure like this for example my ip address is X my thomson gateway is I have on more doubt we connected the firewall directly to my Thomson ADSl router modem and then we have one public ip,what is my question here?
X by default my Thomson gateway is There should be a link under the administration section for reloading. Thanks for this. How can I accommodate both? Also, I have several global IPs and I do not know how to define sub-interfaces to assign several global IPs to a single physical interface.
Please help! With sub-interfaces you just create separate network security zones. If the global IPs are routed towards your outside interface, you can create static NAT commands and redirect those IP addresses to internal hosts for example. Regarding the access lists, well i have exchange server on the internal network as well and I am also planning to add an MS SQL internally. How do I treat this in access list as well?
Excuse my ignorance, i am novice to Cisco. To allow communication between any two ASA interfaces security zones you need two things: So, yes if you have the proper nat in place between DMZ and inside provided that nat-control is enabled then you just need to apply the correct access list on the DMZ interface to allow web server to communicate with the internal SQL server. You say i do not need to have sub-interfaces to assign global IPs. I will have, say, global IP x.
Can I use the same interface to route traffic destined to other global IPs, say x. Andrew, YES Absolutely you can do this. As long as these public IP addresses are routable on the outside interface e. I did not understand fully what you mean. Then you can make changes on the running configuration which are applied immediately.
If the changes are successful, you save them again with the same command as above. How will i go about placing a web server in dmz and making it accessible via public ip?
Any help will be greatly appreciated. Then you will have to allow HTTP from outside using an access control list applied on the outside interface. The configurarion depends on the ASA version you have. If its version 8. Let me know the version to help you. Thank you for the prompt reply, the ASA is running version 8. The server has not been placed in dmz yet, so I have following config for http; access-list inbound extended permit tcp any interface outside eq www static inside,outside tcp interface www What about tying a public ip to the private address lets say Thanks again for the responding, one last question; I have a block of 5 static ips Yes, what you say above is correct.
You will need also to configure an access list which should be allowing traffic from outside to This access list must be applied on the outside interface. Thanks for the e-book, I download it legally of course. I have a question? I know I do not want to do so…. Okay I figured it out what I need to do to fix the issue and still maintain ssh to the firewall without compromising security. I have tried using regex however whenever I apply the policy it somehow blocks a lot of http and IM instant Messaging traffic:.
FW01 config show running-config class-map! FW01 config show running-config policy-map! Would anyone have an Idea what I need to do to fix the issue? Let me see if I find some time to check it out. Yes, the configuration access rules will be retained on the firewall. Hello, How would I go about having a failover internet connection for our asa?
We have a connection coming in from a Comcast and anther from CenturyLink in case Comcast goes down which is happening very frequently nowadays My asa has an open port that I could use for it but not sure how I would go about setting it up, any help will be greatly appreciated. See the link below:. For example currently for email I have static Inside,Outside If yes what do I need to get use this new Block? So do I have to assign an ip address from the new block to one of my interfaces on the ASA.
Would it be possible to show an example of how the config would look like? You will keep the old IP address that you had. Just use static nat commands to statically map the new outside public IP addresses to inside addresses. So based on what would the firewall accept the traffic? Is this secure?? Hi, Thanks for sharing the wealth of information on this blog. However, Is there a way, one can create a virtual ASA, to test the set of rules, prior to posting them to the firewall?
The firewall is not in-house, but on another continent, so flying up and down all the time until all settings are correct, is not my favourite occupation. Thanks for the help. Paul, I would suggest to rent a ccie security rack and get actual access to real asa devices where you can test anything you want. Its pretty cheap. When I try and configure the port with my 1. You can use a subnet mask of You need to find out what the default gateway will be i.
You will achieve this by choosing the correct subnet mask. I have not seen such a configuration before. Just try it and let us know how it goes. When looking at the log I see:. Sorry, I paste wrong outside addresses above comment They show different but both are the same in fact. Okay another question is it best practice to use two interfaces for HA failover? I read somewhere online the ASAx firewalls will continuously fail over if both the heartbeat traffic and the stateful traffic go through a single interface.
This would only make since to me if you have a lot of traffic going through your firewall, and by a lot I mean having hundreds of IPSec tunnels and any other crazy traffic, then maybe. Since The heartbeat data needs to be of low latency and not a lot of packet loss due to a lot of traffic. I always use just one interface for HA failover and everything works OK with no problems.
If this is the case, then you must access the DMZ web server from inside using the private IP address of the web server i. DMZ has X, inside has X and outside The web server can be accessed from the Internet by Internet hosts without problems. Only customers that have downloadd this material are authorized to view it. No part of this publication may be transmitted or reproduced in any way without the prior written permission of the author.
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