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January 2, 2018  4:48 AM

A review for Cisco Press title “Cisco Firepower Threat Defense (FTD)” by Najmul Rajib

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, CCIE, CCNA, CCNP, Cisco, Cisco Press, DNS, firewall, Security, SSL

The recently released Cisco Press title “Cisco Firepower Threat Defense (FTD)” by Najmul Rajib is a great treat to read as he addresses most of the new concepts...

November 21, 2017  4:42 AM

Cisco Champions 2018 applications are open  

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, communities, social media, technologies, User groups

Cisco runs a program known as Cisco Champions, which purely runs on nominations, one can either nominate himself/ herself or someone whom they see as experts in Cisco Products and Technologies. Cisco expects the potential Cisco Champions to actively share their knowledge, expertise and thoughts in...


November 9, 2017  3:23 AM

What is “TCP Spurious Retransmission” ? And why does this occur for the FTP traffic passing through a Cisco ASA Firewall?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, Cisco, Cisco ASA, Filezilla, firewall, FTP, Network security, TCP

Recently we come across an issue where FTP  connection was not established between the client and the FTP server. The connection was passing through the Cisco ASA Firewall. Upon troubleshooting, we discovered 3-way TCP handshake was happening, however, once the login name and password entered to...


June 8, 2017  9:10 AM

Recertifying Cisco expert exams a new twist is here

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
CCIE, Certifications, Cisco

Being a CCIE/CCDE its self is a huge step one would take in his/her life, it's an informed decision one needs to take as maintaining a CCIE/CCDE  is not an easy task. Every two year one needs to recertify his or her CCIE/CCDE either by passing any CCIE written / CCDE written exam or by passing...


May 23, 2017  7:37 PM

How to setup a F5 BIG-IP LTM Virtual lab on VMware Fusion?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
certification, DHCP, Exam, F5, Fusion, Icon, labs, Mac, Network, subnet, Subnet mask, Topology, VMware, VMware ESX

After passing the F5 201 – TMOS Administration Exam, some of the professional friends were keen to know how to build a F5 practice lab on their personnel machines. In this post we will walk through how to build a virtual lab for F5 201 – TMOS Administration Exam on macOS Sierra...


April 6, 2017  11:08 AM

Cisco have issues with certain software versions of ASA and Firepower appliances as it drops traffic after 213 days

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, Blog, bug, Cisco, console, Firewalls, HTTPS, Reboot, Security, SSH, vulnerabilities

Cisco released a field notice and also published a  blog about the latest


March 30, 2017  5:19 AM

Cisco ASA VPN troubleshooting  – Decaps but No encaps

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, bug, Cisco ASA, Cisco VPN, firewall, NAT, Palo Alto Networks, Policies, Proxy, Troubleshooting, tunnel, VPN

Recently we observed a strange issue while building a site to site VPN tunnel between a Cisco ASA [9.1( 5) ] and Palo Alto Next Generation firewall.(PAN-OS 7.0.9) It was observed always phase 1 part of tunnel established successfully with peer however phase 2 failed to come up. Always we were...


March 20, 2017  1:17 PM

How to re-image the Cisco Identity Services Engine (ISE) 2.2 on a Cisco SNS appliance from Cisco Integrated Management Controller?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Analytics, application, Cisco, Cisco security, DHCP, end point, End-user, Java, KVM, NAC, Security, Spoofing, threats, vulnerabilities

When it comes to re-imaging the Cisco Identity Services Engine (ISE) 2.2 on a Cisco SNS appliance , one can use the KVM console comes with Cisco Integrated Management Controller. If one wants to re-image the Cisco SNS-3415-K9  appliance  he/she could face huge challenges with the java especially...


March 9, 2017  7:36 AM

What’s new in Cisco Identity Services Engine (ISE) 2.2? – Series 3

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Analytics, application, Cisco, Cisco security, DHCP, end point, End-user, NAC, Security, Spoofing, threats, vulnerabilities

Cisco Identity Services Engine (ISE) 2.2 does offer lots of new features , in this post we will continue with those features which are focusing on stopping and containing the threats. These new features are quite helpful in reducing risk and contain threats by dynamically controlling network...


March 4, 2017  7:07 PM

What’s new in Cisco Identity Services Engine (ISE) 2.2? – Series 2

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
802.1x, anti--spyware, Anti-virus, application, Applications, BYOD, Cisco, Cisco security, end point, End-user, P2P, Patch management, Program, Security, visibility, Wireless

Cisco Identity Services Engine (ISE) 2.2 comes with lots of new features, in our previous post we did discussed about


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