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Routers

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March 3, 2017  9:30 PM

What is an error “Subtype:Encrypt Result:Drop” in Cisco ASA Firewalls?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ACL, ASA, Cisco, Cisco ASA, DROP, firewall, Packet Tracer, Routers, Security, VPN, VPN Tunnel

After building a site to site VPN tunnel between Cisco ASA and any other firewall or router, often the tunnel is tested using the packet-tracer command in Cisco ASA firewall. While running a packet tracer when one sees an error "Subtype:Encrypt Result:Drop" as shown below

Phase:...

January 29, 2017  7:10 AM

Cisco launches ISE 2.2 with a promise of more visibility and control

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, Enterprise, Internet, Internet of Things, iot, ISE, NAC, Network, Rapid7, Routers, Security, visibility, VPN, Wireless

Since the introduction of Internet in early 90's to general public, no one ever imagined that Internet will grow so fast, and vast majority of organizations and consumers will be interconnected using the internet. It has expanded exponentially and still its is growing at its greatest speed. The...


July 7, 2015  9:24 PM

What is VCP-NV – Series 2?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Auditing, Automation, DHCP, DNS, Firewalls, Load balancers, logging, Monitoring, NAT, Routers, Troubleshooting, VMware, VMware certifications, VPNs

When it comes for the VCP-NV certification preparations, one can certainly rely on VMware, as they have plenty of great resources. In may case I extensively used the following


July 6, 2015  11:42 PM

What is VCP-NV – Series 1?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Auditing, Automation, DHCP, DNS, Firewalls, Load balancers, logging, Monitoring, NAT, Routers, Troubleshooting, VMware, VMware certifications, VPNs

Recently I tested my skills and knowledge on VMware Certifications, VMware Certified Professional – Network Virtualization also known as VCP-NV, which focuses on NSX products. The VCP-NV certification validates ability to install, configure, and administer NSX virtual networking...


May 26, 2015  4:52 AM

What Is uRPF?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
IP, IP address, IP packets, RFC, Routers, Routing Table

uRPF also known as Unicast Reverse Path Forwarding is a great security feature found in Cisco IOS Router and ASA Firewalls which is used to limit the malicious traffic on an enterprise network. Generally when a router receive a unicast IP Packet, the routers cares only about the destination IP...


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