GNS3 now has a free Graphical AAA TACACS+ Appliance. This makes it really easy to add TACACS servers to your GNS3 topologies! Part 1 here: https://youtu.be/aDPogE0CSfw For lots more content, visit http://www.davidbombal.com - learn about GNS3, CCNA, Packet Tracer, Python, Ansible and much, much more. TacacsGUI Free Access Control Server for Your Network Devices. GUI for powerful daemon. The project of Alexey Mochalin, based on tacacs daemon by Marc Huber. =============================== Device configuration used: =============================== ! interface GigabitEthernet0/0 ip address 192.168.122.200 255.255.255.0 ! ! username backup password backup ! aaa new-model ! ! aaa group server tacacs+ gns3group server name tacacsgui ! aaa authentication login default group gns3group local ! tacacs server tacacsgui address ipv4 192.168.122.105 key cisco =============================== Two prominent security protocols used to control access into networks are Cisco TACACS+ and RADIUS. The RADIUS specification is described in RFC 2865 leavingcisco.com, which obsoletes RFC 2138 leavingcisco.com. Cisco is committed to supporting both protocols with the best of class offerings. It is not the intention of Cisco to compete with RADIUS or influence users to use TACACS+. You should choose the solution that best meets your needs. This document discusses the differences between TACACS+ and RADIUS, so that you can make an informed choice. Cisco has supported the RADIUS protocol since Cisco IOS® Software Release 11.1 in February 1996. Cisco continues to enhance the RADIUS Client with new features and capabilities, supporting RADIUS as a standard. Cisco seriously evaluated RADIUS as a security protocol before it developed TACACS+. Many features were included in the TACACS+ protocol to meet the needs of the growing security market. The protocol was designed to scale as networks grow, and to adapt to new security technology as the market matures. The underlying architecture of the TACACS+ protocol complements the independent authentication, authorization, and accounting (AAA) architecture. RADIUS uses UDP while TACACS+ uses TCP. TCP offers several advantages over UDP. TCP offers a connection-oriented transport, while UDP offers best-effort delivery. RADIUS requires additional programmable variables such as re-transmit attempts and time-outs to compensate for best-effort transport, but it lacks the level of built-in support that a TCP transport offers: TCP usage provides a separate acknowledgment that a request has been received, within (approximately) a network round-trip time (RTT), regardless of how loaded and slow the backend authentication mechanism (a TCP acknowledgment) might be. TCP provides immediate indication of a crashed, or not running, server by ... https://www.youtube.com/watch?v=nHImxqKSJlg

This is one of multiple GNS3 labs videos. This video shows you the configuration of EIGRP and Wireshark captures of messages across PPP links. #CCNA #CCENT #CCNP =========================================== Tasks: =========================================== 1) Enable PPP between R1 and R2 2) Enable two-way PPP PAP authentication between R1 and R3 (R1 password = cisco1, R3 password = cisco3) 3) View debug commands to view the PPP negotiation 4) View debug commands to view only the authentication process 5) Use show commands to prove the PPP PAP has successfully negotiated 6) Enable two-way PPP CHAP authentication between R1 and R4 using a password of cisco 7) View debug commands to view the PPP negotiation 8) View debug commands to view only the authentication process 9) Use show commands to prove the PPP CHAP has successfully negotiated 10) Use Wireshark to view to the PAP and CHAP negotiation - What options does LCP negotiate? - Does PAP use clear text authentication? Can you prove it? - Which hashing algorithm used by CHAP? - Does CHAP hash passwords? - Can you see the IPCP NCP negotiation? 11) Enable EIGRP in AS 100 and prove that all devices can ping each other. =========================================== IOS used: c3725-adventerprisek9-mz.124-15.T14.bin =========================================== Get $200 worth of network software for free here: https://goo.gl/613TUF =========================================== GNS3 Topology: =========================================== https://goo.gl/nrKXzq =========================================== Resources: =========================================== http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10313-config-pap.html http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/25647-understanding-ppp-chap.html ... https://www.youtube.com/watch?v=Xw1rPaY9kks

This is one of multiple DHCP troubleshooting scenarios. My CCNA full course is here: http://www.ccnax.com Get $200 worth of network software for free here: https://goo.gl/613TUF Subscribe to learn how to pass the CCNA 200-125 exam. Also includes content for the ICND1 100-105 and ICND2 200-105 exams. What do you want to learn? Let me know via the comments. #CCNA #CCENT #CCNP ... https://www.youtube.com/watch?v=SvZUHsetEOQ

It's possible to earn millions of dollars finding zero days and vulnerabilities in software. But, are you prepared to put in the work? Browser Exploitation Introduction: https://youtu.be/bcnV1dbfKcE Introduction to Buffer Overflows: https://youtu.be/DHCuvMfGLSU Modern Windows Kernel Exploitation: https://youtu.be/nauAlHXrkIk Linux Heap Exploitation: https://youtu.be/dMDoC9DlVzA Modern Binary/Patch Diffing: https://youtu.be/8jVOvPG4TjA Crypto and Blockchain Hacks: https://youtu.be/y5JogTgpp-s My apologies for some of the technical issues in this interview. Zoom is a nightmare :( // MENU // 00:00 - Coming up 00:53 - Stephen Sims introduction & Sans course 03:28 - Stephen's YouTube channel // Off By One Security 07:56 - Growing up with computers 08:57 - Getting involved with Sans courses // Impressed by instructors 09:52 - "The Golden Age of Hacking" // Bill Gates changed the game 15:44 - Making money from Zero-Days // Ethical and Unethical methods, zerodium.com & safety tips 32:56 - How to get started 46:53 - Opportunities in Crypto 50:26 - Windows vs. iOS vs. Linux 53:47 - Which programming language to start with 56:22 - Recommended Sans courses 01:02:04 - Recommended CTF programs & events 01:04:06 - Recommended books 01:08:23 - The Vergilius project 01:10:25 - Connect with Stephen Sims 01:12:24 - Conclusion // Stephen's Social // Twitter: https://twitter.com/Steph3nSims YouTube Live: https://www.youtube.com/@OffByOneSecurity/streams YouTube videos: https://www.youtube.com/@OffByOneSecurity/videos E-mail: Stephen(at)deadlisting.com // Stephen's courses // SANS Course sans.org. https://www.sans.org/cyber-security-courses/ - Advanced exploit development for penetration testers course - Advanced penetration testing, exploit writing, and ethical hacking (GXPN) - ARM Exploit Development // Books discussed // Grey Hat Hacking: https://amzn.to/3B1FeIK Hacking: The art of Exploitation: https://amzn.to/3Us9Uts The Shellcoder’s Handbook: https://amzn.to/3VqUEhY Linkers & Loaders: https://amzn.to/3itqtbe // Websites discussed // Zerodium: https://zerodium.com/ Corelan Cybersecurity Research: https://www.corelan.be/ Fishshell: https://fishshell.com/ Vergilius Project: https://www.vergiliusproject.com/ // David's Social // Discord: https://discord.gg/davidbombal Twitter: https://www.twitter.com/davidbombal Instagram: https://www.instagram.com/davidbombal LinkedIn: https://www.linkedin.com/in/davidbombal Facebook: https://www.facebook.com/davidbombal.co TikTok: http://tiktok.com/@davidbombal YouTube Main Channel: https://www.youtube.com/davidbombal YouTube Tech Channel: https://youtube.com/channel/UCZTIRrENWr_rjVoA7BcUE_A YouTube Clips Channel: https://www.youtube.com/channel/UCbY5wGxQgIiAeMdNkW5wM6Q YouTube Shorts Channel: https://www.youtube.com/channel/UCEyCubIF0e8MYi1jkgVepKg Apple Podcast: https://davidbombal.wiki/applepodcast Spotify Podcast: https://open.spotify.com/show/3f6k6gERfuriI96efWWLQQ apple ios android samsung exploit exploit development windows linux exploits zero days zero day 0day 1day hack hacking hacker windows kernel windows kernel exploit linux heap linux heap exploit reverse engineering reverse engineer reverse exploit red team red teaming binary diff binary diffing #android #ios #linux ... https://www.youtube.com/watch?v=LWmy3t84AIo