The Cisco firewall comes with the FTD firmware by default, and there are several reasons of using the ASA firmware on this Cisco new firewall. I have attached the steps below to let the Cisco firewall to run the ASA firmware by re-imaging it.
This is the same way to change from ASA firmware to FTD firmware.
Continue readingIt has been a while since I have done any labs after getting a new job. This time, I will be building a NNI option C using both Cisco IOS and Juniper MX. The reason I write this is because I do not find many resources on the internet about the inter AS connection using 2 different software at the same time. Hope this can be useful for anyone who is having the same struggle as i do.
(the AS# below are randomly picked!!)
Based on the lab diagram (dont feel like copping it up), as the internal VPN service is already running and the intra AS is running OSPF and LDP for MPLS, I will be connecting AS5052 (the green aren in middle) and AS7077 (the orange area at the bottom) together over NNIs to extend the MPLS VPN services.
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Setting up a policy based site to site IPSec VPN tunnel with static IP address is quite stright forward in Cisco ASA, but what if one of the end point is using dymanic IP address?
In this lab, I will be using 2 virtual ASA (9.6(2)) to create a site to site IPSec VPN tunnel, as well as setting up Cisco VPN client in one of the ASA with static IP address.
The ASA-F14 is the one with static IP address, and the ASA-F16 is using dynamic IP address.
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The beaut of MPLS VPN is to have multi tenants running over the same MPLS core network and each tenant are prevented to access other tenants networks. But what if the 2 different tenants want to connect to each other?
In the lab below, we have 2 different tenants and they are 1120020010 (RT:200010) in Router 12 and 1030010010 (RT:100010) in Router 03. By default, the ASAs connected to these VRFs cannot communicate since they are in 2 different VRF network. In this case, I will be using Cisco IOS and Juniper MX to let 2 different VRFs to connect together.
We could check the existing configuration and the route table in Router 03 and Router 12
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For those who had been working with Cisco routers, setting up a Cisco ASA stateful policy is as simple as setting up an ACL. By default, ASA would drop any TCP connection that doesn’t have a session record created with a sync packet. In that case user doesn’t require to a setup ACL for return traffic like working with routers.
In this example, we have 192.168.104.250/32 as the server in the DMZ and have the have NAT 1 to 1 incoming traffic mapping applied to allow internet user accessing the http service only.
The IP address of the firewall is 10.50.2.10/29, and we will assign the mapping of the server to another external IP address of 10.50.2.11
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Compute networking sometimes gives new ITers a feeling of confusion and complication when they start learning networking, this post will simply explain it in laymen terms and provide a basic concept and some basic configuration on Cisco productions for reference.
So what is layer 2 communication? What does it provide or allow us to do? What is networking HUB and what can it do? What is the different between network switches? What are LAN and what are VLANs? (This post will explain the ethernet network only) Continue reading
In this post, I will show you guys how to setup a Cisco ASA firewall serves as a layer 3 packet transfer device. The example will be demonstrate with 192.168.3.10/32 machine accessing to 9.9.9.92/32 via IPerf. There is only simple routing and has no NAT involve.
In this setup, the ASA is acting as the gateway between office network and the internet. The 192.168.3.0/24 is the internal subnet and 10.0.0.20/30 is the internet. There are couple areas we have to handle, and they are routing, and policy. Since ASA is a stateful device, we have to apply policy to allow internal network to access external network, but not vise versa.
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Cisco ASA firewall is a security appliance that can perform packet inspection and with limited routing features. For those who are new to this product, it uses different ways to present its information than Cisco routers. There might have some difficulty at first, but since it is using syntax similar with other Cisco products, such as “show run”, and it is not too hard to pick up this product. I will list out some frequently used commands for troubleshooting purpose.
Commands above are for general use, and can be run under “config mode” without the “do”. I will demonstrate more command within my ASA posts.