Videos uploaded by user “Ryan Lindfield”
Why gratuitous ARP is not always about ARP :)
Just did a quick & dirty explanation of why devices send gratuitous ARP after a failover of some sort occurs, even if MAC to IP mappings don't change.
Views: 22979 Ryan Lindfield
Understanding AH vs ESP and ISKAKMP vs IPSec in VPN tunnels
This is a sniplet from the Cisco SIMOS course, where we discuss the logical constructs behind a site-to-site IPSec VPN. I hope that this content helps you understand what's happening behind the scenes of your VPN's.
Views: 175821 Ryan Lindfield
Understanding Proxy Arp & How not to setup static routes
A brief summary of proxy ARP followed by a demonstration of effects it may be having on your router.
Views: 31806 Ryan Lindfield
Understanding Cisco SSL VPN vs IPSec VPN
This video is from the Cisco SIMOS class at Stormwind Live, in this section we explore the differences between the newer SSL VPN and legacy IPsec VPN
Views: 148252 Ryan Lindfield
NHRP Crash Course
Quick clip from class today discussing NHRP on the virtual whiteboard.
Views: 7741 Ryan Lindfield
Cisco Crypto Map / Transform Set Tutorial
A friend emailed today asking about how VPN's work between two sites, a bit confused on the addressing and naming, what' a crypto map, crypto acl, transform set etc. Here you have it.
Views: 13037 Ryan Lindfield
Understanding Next Hop Self in EIGRP with DMVPN
Lots of confusion surrounding Next Hop Self in DMVPN, I hope this video helps make sense of it for you.
Views: 3203 Ryan Lindfield
OSPF Router ID's explained
A question came in regarding the use of loopbacks as a Router ID and why is that a best practice. I hope that this is helpful!
Views: 2670 Ryan Lindfield
Modular Policy Framework on the Cisco ASA
Just taking the opportunity to practice using Camtasia and perform demonstrations, I apologize for the quality of the video, and lack of preparation on my demo, you'll see me stumbling and searching a bit, but I hope that you find the content to be useful! Over time each demo should get a little better, so subscribe and hang in there with me! Thanks for watching :)
Views: 7242 Ryan Lindfield
Tweaking OSPF for DMVPN
Remember when running OSPF across a DMVPN deployment that many things must match! Area ID, Area Type, Authentication Type, Authentication Key, Hello & Dead Interval, Network Type, MTU, Subnet Mask, etc Also remember you'll likely want to raise the Priority of the HUB to win the DR Election, and set the Priority to zero on the spokes so that they don't try to become DR.
Views: 1108 Ryan Lindfield
Deep dive on traceroute, Firewallking, TCP traceroute and scanning
This is a session from my CEH class at Stormwind. The class runs over 3 weeks, and we explore various hacking technologies. In this particular session we go over various packet stunts used by attackers for reconnaissance.
Views: 8654 Ryan Lindfield
Everquest 2 EQ2 Jingle Bells
Everquest 2 characters singing Jingle Bells.
Views: 12375 Ryan Lindfield
Network troubleshooting , Mixed Vendor, VLANs, Tagging, STP and beyond!
Many engineers I meet have mixed environments, and while Cisco is dominant there is also quite a bit of HP gear out there. I hear students complain because it behaves differently so I shared 3 things to watch for that we're not used to thinking about in the Cisco world. I hope this helps make your week a little less stressful, thanks for watching.
Views: 3243 Ryan Lindfield
Encapsulation Explained, AKA Ping doesn't work at layer 3, I promise :)
This is a foundational topic, and in detail, hoping to provide some clarity to anyone struggling with the concept of encapsulation. Before we dive deeper I want to make sure we're all building on a solid foundation, let's look at layer 2/3/4 headers. I'm responding to a question that came in regarding ESP working at the network layer (3) I explain why that's not entirely true, it relies upon layer 3, but works at layer 4 similar to ICMP.
Views: 558 Ryan Lindfield
Crash Course On Crashing! Buffer Overflow demonstration
Just a quick demo of a buffer overflow against a web server. The video quality is poor, but you can follow along and get the idea. I'm pretty rough on video, but trying to get better and learning as I go. Looking forward to any constructive feedback! Thanks for watching :)
Views: 861 Ryan Lindfield
Fred Howard Park w/ Phantom 2
DJI Phantom 2 Vision Plus at Fred Howard Park in Tarpon Springs, FL.
Views: 225 Ryan Lindfield
M3 Sebring
First time out, Brian driving the m3 and showing me the ropes.
Views: 223 Ryan Lindfield
Chasing Desops
Chasing my wife (Blue E92 M3)around Sebring at the Suncoast Porsche Club Drivers Education event. Really great time, fantastic instructors, unfortunately had some boost issues, but will get them squared away, already looking forward to next time. Audio track is: Baião Lo-fi by Chico Correa and Electronic Band
Views: 220 Ryan Lindfield
Crash Course on Crashing.mp4
Quick and dirty explanation of buffer overflows
Views: 200 Ryan Lindfield
Student Question: Does mixing vendors increase security?
I had a fantastic question come in today regarding defense in Depth. I think this is a great idea, and give my thoughts on it. Having watched the recording, I've already thought of mitigation techniques and counters to my own points, but I enjoy hearing others opinions on defense strategies. Let me know what you think, I realize it would be additional expense and administrative overhead. Also, if there is a shared component or library, say two vendors use OpenSSL, and OpenSSL has a bug, then both vendors have an issue, so mixed proprietary systems may be best.
Views: 713 Ryan Lindfield