US Robotics USR3520 User Manual page 62

IKE Settings
The Internet Key Exchange is a protocol used to set-up the security associations in the IPsec protocol
suit.
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IKE Version: V1,V2
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Negotiation Mode (only for IKE V1): Main & Aggressive
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IKE Encryption: 3DES, AES128, AES 256
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IKE Authentication: MD5, SHA1, SHA256
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IKE Key Group: DH1, DH2, DH5, DH14

IKE SA Lifetime: must be a value between 60 - 86400
http://en.wikipedia.org/wiki/Internet_Key_Exchange
IPsec Settings
These fields are used to configure the IPsec tunnel's encryption details.

IPsec Encryption: 3DES, AES128, AES 256

IPsec Authentication: MD5, SHA1, SHA256

IPsec Key Group: DH1, DH2, DH5, DH14

IPsec SA Lifetime: must be a value between 60 - 86400
Revision: 1.00 Copyright 2015 U.S. Robotics Corporation 62 | P a g e