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IPSec Site to Site VPN tunnels
 
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This demo walks through the purpose and workings of an IPSec VPN tunnel, including implementation and verification of the tunnel. Enjoy!
Views: 367610 Keith Barker
Multilink VPN, visibilidad Internet y redes IPSec
 
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Show crypto isakmp sa The following four modes are found in IKE main mode MM_NO_STATE* – ISAKMP SA process has started but has not continued to form (typically due to a connectivity issue with the peer) MM_SA_SETUP* – Both peers agree on ISAKMP SA parameters and will move along the process MM_KEY_EXCH* – Both peers exchange their DH keys and are generating their secret keys. (This state could also mean there is a mis-matched authentication type or PSK, if it does not proceed to the next step) MM_KEY_AUTH* – ISAKMP SA’s have been authenticated in main mode and will proceed to QM_IDLE immediately. The following three modes are found in IKE aggressive mode AG_NO_STATE** – ISAKMP SA process has started but has not continued to form (typically do to a connectivity issue with the peer) AG_INIT_EXCH** – Peers have exchanged their first set of packets in aggressive mode, but have not authenticated yet. AG_AUTH** – ISAKMP SA’s have been authenticated in aggressive mode and will proceed to QM_IDLE immediately. The following mode is found in IKE Quick Mode, phase 2 QM_IDLE*** – The ISAKMP SA is idle and authenticated Here are a few more commands we can issue to get a quick glimpse of the status of any IPSec VPN’s. sh crypto ipsec sa – Now this output can really daunting at first just due to the amount of information that is displayed here but there are a few key things to watch out for. Such as the #pkts encaps/encrypt/decap/decrypt, these numbers tell us how many packets have actually traversed the IPSec tunnel and also verifies we are receiving traffic back from the remote end of the VPN tunnel. This will also tell us the local and remote SPI, transform-set, DH group, & the tunnel mode for IPSec SA. sh crypto session Up-Active – IPSec SA is up/active and transferring data. Up-IDLE – IPSsc SA is up, but there is not data going over the tunnel Up-No-IKE – This occurs when one end of the VPN tunnel terminates the IPSec VPN and the remote end attempts to keep using the original SPI, this can be avoided by issuing crypto isakmp invalid-spi-recovery Down-Negotiating – The tunnel is down but still negotiating parameters to complete the tunnel. Down – The VPN tunnel is down. So using the commands mentioned above you can easily verify whether or not an IPSec tunnel is active, down, or still negotiating. Next up we will look at debugging and troubleshooting IPSec VPNs * – Found in IKE phase I main mode ** – Found in IKE phase I aggressive mode *** – Found in IKE phase II quick mode DE NADA SIRVE MONTAR UNA SONDA SINO SE APLICA EL CORRECTIVO, QUEDARIA CON UP-NO-IKE Otro punto es que es multipoint pero al final son IP´s fijas en ambos extremos remoto y central.
Views: 498 Bruno Olvera Jasso
VPN en Cisco Packet Tracer
 
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Simulación de una VPN en Cisco Packet Tracer. Archivo pkt: https://mega.nz/#!u4ZVXahT!AC82eMt_JkYNltPowhdRJcFdZ8klOHEfIzUJYzsty2E Los comandos utilizados para configurar los routers son: (Router 1) crypto isakmp policy 10 authentication pre-share hash sha encryption aes 256 group 2 lifetime 86400 exit crypto isakmp key toor address 10.0.0.2 (router 2) crypto ipsec transform-set TSET esp-aes esp-sha-hmac access-list 101 permit ip 192.168.10.0 0.0.0.255 192.168.20sho.0 0.0.0.255 (Direccion red 1 y red 2) crypto map CMAP 10 ipsec-isakmp set peer 10.0.0.2 (Router 2) match address 101 set transform-set TSET exit interface fa0/1 (Interface a Router 2) crypto map CMAP do wr (Router 2) crypto isakmp policy 10 authentication pre-share hash sha encryption aes 256 group 2 lifetime 86400 exit crypto isakmp key toor address 10.0.0.1 (router 1) crypto ipsec transform-set TSET esp-aes esp-sha-hmac access-list 101 permit ip 192.168.20.0 0.0.0.255 192.168.10.0 0.0.0.255 (Direccion red 2 y red 1) crypto map CMAP 10 ipsec-isakmp set peer 10.0.0.1 (Router 1) match address 101 set transform-set TSET exit interface fa0/1 (Interface a Router 1) crypto map CMAP do wr Los comandos para ver los paquetes enviados y recibidos y comprobar que fueron encriptados/desencriptados son: show crypto isakmp sa show crypto ipsec sa
Views: 56162 José Martín
Cisco ASA Basic VPN Tunnel Troubleshooting
 
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nycnetworkers.com meetup.com/nycnetworkers A video on some basic VPN Tunnel troubleshooting steps for the Cisco ASA
Views: 39659 NYC Networkers
Conditional Debug on Cisco router
 
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http://gns3vault.com Conditional debug is useful when you want to see more specific debug information. Instead of having your screen flooded with debug information you can filter it per interface and more.
Views: 10363 GNS3Vault
Cisco ASA Site-to-Site VPN Configuration (Command Line):  Cisco ASA Training 101
 
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http://www.soundtraining.net Author, speaker, and IT trainer Don R. Crawley demonstrates how to configure a site-to-site VPN between two Cisco ASA security appliances. The demo is based on software version 8.3(1) and uses IPSec, ISAKMP, tunnel-groups, Diffie-Hellman groups, and an access-list. The demo is based on the popular book "The Accidental Administrator: Cisco ASA Security Appliance: Step-by-Step Configuration Guide (http://amzn.com/1449596622) and includes a link where you can download a free copy of the configs and the network diagram.
Views: 225924 soundtraining.net
How to troubleshoot the VPN Error: No Proposal Chosen
 
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Learn about how to troubleshoot the VPN Error: No Proposal Chosen, “SonicWall video solutions” https://fuzeqna.com/sonicwallkb/ext/kbdetail.aspx?kbid=3902
Views: 4907 Dell EMC Support
How to Setup a Cisco Router VPN (Site-to-Site):  Cisco Router Training 101
 
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http://www.soundtraining.net/bookstore In this VPN tutorial video, author, speaker, and IT trainer Don R. Crawley demonstrates how to configure a site-to-site VPN between two Cisco routers. The demo is based on software version 12.4(15)T6 and uses IPSec, ISAKMP, tunnel-groups, Diffie-Hellman groups, and an access-list. The demo is based on the popular book "The Accidental Administrator: Cisco Router Step-by-Step Configuration Guide (http://amzn.com/0983660727) and includes a link where you can download a free copy of the configs and the network diagram.
Views: 226172 soundtraining.net
Cisco ASA - Remote Access VPN (IPSec)
 
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How to quickly set up remote access for external hosts, and then restrict the host's access to network resources.
Views: 150939 Blog'n'Vlog
How To Decrypt WPA2 with Wireshark
 
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big note: YOU NEED TO CAPTURE THE PACKETS FROM WHEN THE COMPUTER JOINS THE ACCESS POINT AND WITH A PROPER CARD OR PACKET CAPTURE TOOL !!! Packet analysis is tricky enough without layering on WiFi. First you need to know if you have a WiFi card that can capture the WiFi radio header, then you have to figure out if you can capture in promiscuous mode, then you need to understand if the wireless network has client isolation or similar configurations. Whew… That where having a specifically designed Wifi tool helps. In this example I used a Fluke Networks One Touch to capture some packets. Capturing them was the easy part. Now I have to decrypt them. I chose to use Wireshark and want to share with you how to decrypt a trace file when the client is using WPA2 encryption. As I said in the video, the key (no pun) here is to start your capture before the client authenticates with the access point. Enjoy
Views: 65764 The Technology Firm
What is PRE-SHARED KEY? What does PRE-SHARED KEY mean? PRE-SHARED KEY meaning & explanation
 
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What is PRE-SHARED KEY? What does PRE-SHARED KEY mean? PRE-SHARED KEY meaning - PRE-SHARED KEY definition - PRE-SHARED KEY explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ In cryptography, a pre-shared key (PSK) is a shared secret which was previously shared between the two parties using some secure channel before it needs to be used. To build a key from shared secret, the key derivation function is typically used. Such systems almost always use symmetric key cryptographic algorithms. The term PSK is used in Wi-Fi encryption such as Wired Equivalent Privacy (WEP), Wi-Fi Protected Access (WPA), where the method is called WPA-PSK or WPA2-PSK, and also in the Extensible Authentication Protocol (EAP), where it is known as EAP-PSK. In all these cases, both the wireless access points (AP) and all clients share the same key. The characteristics of this secret or key are determined by the system which uses it; some system designs require that such keys be in a particular format. It can be a password, a passphrase, or a hexadecimal string. The secret is used by all systems involved in the cryptographic processes used to secure the traffic between the systems. Crypto systems rely on one or more keys for confidentiality. One particular attack is always possible against keys, the brute force key space search attack. A sufficiently long, randomly chosen, key can resist any practical brute force attack, though not in principle if an attacker has sufficient computational power (see password strength and password cracking for more discussion). Unavoidably, however, pre-shared keys are held by both parties to the communication, and so can be compromised at one end, without the knowledge of anyone at the other. There are several tools available to help one choose strong passwords, though doing so over any network connection is inherently unsafe as one cannot in general know who, if anyone, may be eavesdropping on the interaction. Choosing keys used by cryptographic algorithms is somewhat different in that any pattern whatsoever should be avoided, as any such pattern may provide an attacker with a lower effort attack than brute force search. This implies random key choice to force attackers to spend as much effort as possible; this is very difficult in principle and in practice as well. As a general rule, any software except a Cryptographically secure pseudorandom number generator should be avoided.
Views: 5419 The Audiopedia
Cisco ASA - Basic CLI Configuration
 
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A basic command line interface configuration to get beginners up and running. This video will be beneficial to anyone who is new to the Cisco ASA platform. How to set up a Cisco ASA interfaces, how to set up Cisco ASA routes, how to set up telnet, how to set up ASDM access.
Views: 118246 Blog'n'Vlog
How to Install an ASA VPN (SSL) Certificate: Cisco ASA Training 101
 
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http://www.soundtraining.net-cisco-asa-training-101 Learn how to generate a CSR (Certificate Signing Request) to submit to a CA (Certificate Authority) and how to install the signed certificate from the CA. In this Cisco ASA tutorial, IT author-speaker Don R. Crawley shows you the basics of digital certificate management using a combination of the CLI (command line interface) and the GUI (graphical user interface) on a Cisco ASA Security Appliance.
Views: 116086 soundtraining.net