ZyXEL Communications P-334W - Manual (Page 233)

Prestige 334W User’s Guide
VPN Screens 16-23
Table 16-8 VPN IKE: Advanced
LABEL DESCRIPTION
Peer Content
The configuration of the peer content depends on the peer ID type.
For IP, type the IP address of the computer with which you will make
the VPN connection. If you configure this field to 0.0.0.0 or leave it
blank, the Prestige will use the address in the Secure Gateway
Address field (refer to the Secure Gateway Address field description).
For DNS or E-mail, type a domain name or e-mail address by which to
identify the remote IPSec router. Use up to 31 ASCII characters
including spaces, although trailing spaces are truncated. The domain
name or e-mail address is for identification purposes only and can be
any string.
It is recommended that you type an IP address other than 0.0.0.0 or use the
DNS or E-mail ID type in the following situations:
When there is a NAT router between the two IPSec routers.
When you want the Prestige to distinguish between VPN connection requests
that come in from remote IPSec routers with dynamic WAN IP addresses.
IKE Phase 1 A phase 1 exchange establishes an IKE SA (Security Association).
Negotiation Mode
Select Main or Aggressive from the drop-down list box. The Prestige's
negotiation mode should be identical to that on the remote secure gateway.
Encryption Algorithm
Select DES or 3DES from the drop-down list box. The Prestige's encryption
algorithm should be identical to the secure remote gateway. 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. 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.
Authentication
Algorithm
Select SHA1 or MD5 from the drop-down list box. The Prestige's authentication
algorithm should be identical to the secure remote gateway. MD5 (Message
Digest 5) and SHA1 (Secure Hash Algorithm) are hash algorithms used to
authenticate the source and integrity of packet data. The SHA1 algorithm is
generally considered stronger than MD5, but is slower. Select SHA-1 for
maximum security.