BEC MX-200 User Manual page 85

IPSec Phase 1(IKE)
IKE Mode: IKE, Internet Key Exchange, is the mechanism to negotiate and exchange parameters
and keys between IPSec peers to establish security associations(SA). Select Main or Aggressive
mode.
Pre-Shared Key: This is for the Internet Key Exchange (IKE) protocol, a string from 4 to 128
characters. Both sides should use the same key. IKE is used to establish a shared security policy and
authenticated keys for services (such as IPSec) that require a key. Before any IPSec traffic can be
passed, each router must be able to verify the identity of its peer. This can be done by manually
entering the pre-shared key into both sides (router or hosts).
Local ID Type and Remote ID Type: When the mode of IKE is aggressive, Local and Remote peers
can be identified by other IDs.
IDContent: Enter IDContent the name you want to identify when the Local and Remote Type are
Domain Name; Enter IDContent IP address you want to identify when the Local and Remote Type are
IP addresses (IPv4 and IPv6 supported).
Encryption Algorithm: Select the encryption algorithm from the drop-down menu. There are several
options: DES and AES (128, 192 and 256). 3DES and AES are more powerful but increase latency.
 DES: Stands for Data Encryption Standard, it uses 56 bits as an encryption method.
 3DES: Stands for Triple Data Encryption Standard, it uses 168 (56*3) bits as an encryption
method.
 AES: Stands for Advanced Encryption Standards, you can use 128, 192 or 256 bits as
encryption method.
Authentication Algorithm: Authentication establishes the integrity of the datagram and ensures it is
not tampered with in transmission. There are 3 options: Message Digest 5 (MD5) and Secure Hash
Algorithm (SHA1, SHA256). SHA1 is more resistant to brute-force attacks than MD5. However, it is
slower.
 MD5: A one-way hashing algorithm that produces a 128−bit hash.
 SHA1: A one-way hashing algorithm that produces a 160−bit hash.
Diffle-Hellman Group: It is a public-key cryptography protocol that allows two parties to establish a
shared secret over an unsecured communication channel (i.e. over the Internet). MODP stands for
Modular Exponentiation Groups.
IPSec Phase 2(IPSec)
IPSec Proposal: Select the IPSec security method. There are two methods of verifying the
authentication information, AH(Authentication Header) and ESP(Encapsulating Security Payload).
Use ESP for greater security so that data will be encrypted and the data origin be authenticated but
using AH data origin will only be authenticated but not encrypted.
BEC MX-200 User Manual
Device Configuration
VPN – IPSec
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