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Internet Protocol Security Vpn (IPSEC VPN)

 


IPSEC VPN CONFIGURATION DETAILS VARY DEPENDING ON THE ROUTER OR DEVICE YOU ARE USING. HOWEVER, THE GENERAL STEPS INVOLVED IN CONFIGURING AN IPSEC VPN ARE AS FOLLOWS:

CREATE AN IPSEC POLICY.

THIS POLICY DEFINES THE ENCRYPTION AND AUTHENTICATION ALGORITHMS THAT WILL BE USED TO PROTECT THE TRAFFIC THAT FLOWS THROUGH THE VPN TUNNEL.

CREATE AN IPSEC TRANSFORM SET.

THIS TRANSFORM SET SPECIFIES THE SPECIFIC ENCRYPTION AND AUTHENTICATION ALGORITHMS THAT WILL BE USED FOR A PARTICULAR TRAFFIC FLOW.

CREATE A CRYPTO MAP.

THIS CRYPTO MAP ASSOCIATES AN IPSEC POLICY AND TRANSFORM SET WITH A SPECIFIC INTERFACE.

APPLY THE CRYPTO MAP TO THE INTERFACE.

THIS WILL ENABLE IPSEC ON THE INTERFACE AND ALLOW TRAFFIC TO FLOW THROUGH THE VPN TUNNEL.

HERE ARE SOME ADDITIONAL DETAILS ABOUT EACH OF THESE STEPS:

IPSEC POLICY:

THE IPSEC POLICY DEFINES THE ENCRYPTION AND AUTHENTICATION ALGORITHMS THAT WILL BE USED TO PROTECT THE TRAFFIC THAT FLOWS THROUGH THE VPN TUNNEL. THE FOLLOWING ARE

SOME OF THE MOST COMMON ENCRYPTION ALGORITHMS USED IN IPSEC:

3DES: TRIPLE DATA ENCRYPTION STANDARD.

 THIS IS A SYMMETRIC ENCRYPTION ALGORITHM THAT USES THREE KEYS TO ENCRYPT DATA.

AES: ADVANCED ENCRYPTION STANDARD.

THIS IS A SYMMETRIC ENCRYPTION ALGORITHM THAT IS CONSIDERED TO BE MORE SECURE THAN 3DES.

ESP: ENCAPSULATING SECURITY PAYLOAD.

THIS IS A PROTOCOL THAT IS USED TO ENCRYPT IP PACKETS.

AH: AUTHENTICATION HEADER.

THIS IS A PROTOCOL THAT IS USED TO AUTHENTICATE IP PACKETS.

IPSEC TRANSFORM SET: 

THE IPSEC TRANSFORM SET SPECIFIES THE SPECIFIC ENCRYPTION AND AUTHENTICATION ALGORITHMS THAT WILL BE USED FOR A PARTICULAR TRAFFIC FLOW.

THE FOLLOWING ARE SOME OF THE MOST COMMON TRANSFORM SETS USED IN IPSEC:

ESP-3DES-SHA:

 THIS TRANSFORM SET USES 3DES FOR ENCRYPTION AND SHA FOR AUTHENTICATION.

ESP-AES-SHA:

THIS TRANSFORM SET USES AES FOR ENCRYPTION AND SHA FOR AUTHENTICATION.

ESP-AES-GCM:

THIS TRANSFORM SET USES AES FOR ENCRYPTION AND GCM FOR AUTHENTICATION.

CRYPTO MAP:

 THE CRYPTO MAP ASSOCIATES AN IPSEC POLICY AND TRANSFORM SET WITH A SPECIFIC INTERFACE. THIS ALLOWS TRAFFIC TO FLOW THROUGH THE VPN TUNNEL ONLY IF IT MATCHES THE POLICY AND TRANSFORM SET THAT ARE ASSOCIATED WITH THE INTERFACE.

APPLYING THE CRYPTO MAP TO THE INTERFACE:

THIS WILL ENABLE IPSEC ON THE INTERFACE AND ALLOW TRAFFIC TO FLOW THROUGH THE VPN TUNNEL.

ONCE YOU HAVE CONFIGURED IPSEC ON YOUR ROUTER OR DEVICE, YOU SHOULD TEST THE CONFIGURATION TO MAKE SURE THAT IT IS WORKING PROPERLY. YOU CAN DO THIS BY SENDING TRAFFIC BETWEEN TWO DEVICES THAT ARE CONNECTED TO THE VPN TUNNEL.

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