VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
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Advanced Option
This function is only available after completed creating an IPSec account. Click Advanced Option to
change the following settings:
IKE (Internet key Exchange) Mode: Select IKE mode to Main mode or Aggressive mode. This IKE
provides secured key generation and key management.
IKE Proposal:
Hash Function: It is a Message Digest algorithm which coverts any length of a message into a unique
set of bits. It is widely used MD5 (Message Digest) and SHA-1 (Secure Hash Algorithm) algorithms.
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
Encryption: Select the encryption method from the pull-down menu. There are several options, DES,
3DES 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.
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