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January 25, 2016  4:45 AM

What is OSPF Totally Stubby Area?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco IOS, Default route, IOS commands, OSPF, router

OSPF Totally Stubby Area basically filters out an information of a OSPF database purely based on the LSA types. An ABR  in a Totally Stubby Area  prevents LSA type 3, Type4 and Type 5  to be flooded in to a Totally Stub Area.  It replaces all these types of LSA with a default route. Basically...

January 22, 2016  9:41 PM

What is OSPF Stub Area?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Default route, IOS commands, LSA, OSPF, OSPF protocol, router

We all know OSPF as routing protocol is one of most widely used IGP protocol, OSPF happens to be the most scalable IGP protocol. OSPF also happens to be one of complex protocols as it deals with various concepts and terminologies. Once such topic where people get confused is OSPF Area types. I...


December 20, 2015  4:49 AM

How to capture packets in Cisco VIRL?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, Packet capture, Packet Sniffing, router, SSH, Telnet, Wireshark

With the introduction of Cisco VIRL 1.0.0,capturing the  traffic has become quite simpler. One can now directly click the link on a device and do a packet capture. , in this post lets see how we can capture the traffic in Cisco VIRL and analyse it. Step 1: Login in to VRIL server form your web...


December 18, 2015  6:34 PM

How to configure Cisco VIRL – VMMaestro to use external telnet and SSH Client?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
router, SSH, Telnet

Cisco VIRL comes with an internal SSH and Telnet client which is quite good and it opens all the SSH and telnet sessions within VMMaestro GUI, but if some one wants to use Secure CRT on  their MAC as external client, one can easily configure the changes in VIRL VMMaestro,

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September 19, 2015  4:43 PM

Palo Alto Networks Firewall Configuration Management Auditing

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Auditing, Configuration management, firewall, router, Troubleshooting

Palo Alto Network Firewall offers configuration-auditing feature, using this feature one can compare any two configuration files and see the difference. Palo Alto firewalls after comparing any two configuration files, highlights the differences using color coding schemes. Following color codes are...


September 12, 2015  10:38 AM

What is the difference between Candidate configuration & Running Configuration in Palo Alto Firewalls?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
CLI, configuration, Firewalls, Palo Alto Networks, router, virtual

Palo Alto Networks Firewalls comes with following config types

  • Candidate Configuration
  • Running Configuration
When ever some one creates a new policy or changes the configuration settings of an existing Security Policy or any other parameters like zone, Virtual...


May 30, 2015  8:05 AM

How to Configure uRPF in Strict Mode?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco IOS, Cisco security, IP address, router, Topology

In this post lets configure uRPF in Strict mode, I have created the below topology using Cisco VIRL, a great tool to test many things.

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