ZyXEL P-202H User Guide - Page 132
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P-202H Plus v2 User's Guide Table 38 Advanced Rule Setup (continued) LABEL Encryption Algorithm Authentication Algorithm SA Life Time Encapsulation Perfect Forward Secrecy (PFS) Apply Cancel DESCRIPTION The encryption algorithm for the ZyXEL Device and the secure remote gateway should be identical. When DES is used for data communications, both sender and receiver must know the same secret key, which can be used to encrypt and decrypt the message or to generate and verify a message authentication code. The DES encryption algorithm uses a 56-bit key. Triple DES (3DES) is a variation on DES that uses a 168-bit key. As a result, 3DES is more secure than DES. It also requires more processing power, resulting in increased latency and decreased throughput. Select NULL to set up a tunnel without encryption. When you select NULL, you do not enter an encryption key. Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet data. The SHA1 algorithm is generally considered stronger than MD5, but is slower. Select MD5 for minimal security and SHA-1 for maximum security. Define the length of time before an IKE SA automatically renegotiates in this field. It may range from 60 to 3,000,000 seconds (almost 35 days). A short SA Life Time increases security by forcing the two VPN gateways to update the encryption and authentication keys. However, every time the VPN tunnel renegotiates, all users accessing remote resources are temporarily disconnected. Select Tunnel mode or Transport mode from the drop down list-box. The ZyXEL Device's encapsulation mode should be identical to the secure remote gateway. Perfect Forward Secrecy (PFS) is disabled (None) by default in phase 2 IPSec SA setup. This allows faster IPSec setup, but is not so secure. Choose from DH1 or DH2 to enable PFS. DH1 refers to Diffie-Hellman Group 1, a 768 bit random number. DH2 refers to Diffie-Hellman Group 2, a 1024 bit (1Kb) random number (more secure, yet slower). Click Apply to save your changes back to the ZyXEL Device and return to the VPN-IKE screen. Click Cancel to return to the VPN-IKE screen without saving your ZyXEL Device. 11.12 Manual Key Manual key management is useful if you have problems with IKE key management. 11.12.1 Security Parameter Index (SPI) An SPI is used to distinguish different SAs terminating at the same destination and using the same IPSec protocol. This data allows for the multiplexing of SAs to a single gateway. The SPI (Security Parameter Index) along with a destination IP address uniquely identify a particular Security Association (SA). The SPI is transmitted from the remote VPN gateway to the local VPN gateway. The local VPN gateway then uses the network, encryption and key values that the administrator associated with the SPI to establish the tunnel. Note: Current ZyXEL implementation assumes identical outgoing and incoming SPIs. 131 Chapter 11 VPN Screens