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Chapter 18 IPSec VPN

NBG5715 User’s Guide

133

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 NBG5715

will use the address in the Secure Gateway Address field (refer to the Secure

Gateway Address field description).

For Domain Name 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

Domain Name or E-mail ID type in the following situations:

When there is a NAT router between the two IPSec routers.

When you want the NBG5715 to distinguish between VPN connection requests

that come in from remote IPSec routers with dynamic WAN IP addresses.

IPSec Algorithm

Phase 1

Pre-Shared

Key

Type your pre-shared key in this field. A pre-shared key identifies a

communicating party during a phase 1 IKE negotiation. It is called "pre-shared"

because you have to share it with another party before you can communicate

with them over a secure connection.

Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62 hexadecimal

("0-9", "A-F") characters. You must precede a hexadecimal key with a "0x”

(zero x), which is not counted as part of the 16 to 62 character range for the

key. For example, in "0x0123456789ABCDEF", “0x” denotes that the key is

hexadecimal and “0123456789ABCDEF” is the key itself.

Both ends of the VPN tunnel must use the same pre-shared key. You will receive

a “PYLD_MALFORMED” (payload malformed) packet if the same pre-shared key

is not used on both ends.

Mode Select Main or Aggressive from the drop-down list box. Multiple SAs

connecting through a secure gateway must have the same negotiation mode.

Encryption

Algorithm

Select which key size and encryption algorithm to use for data communications.

Choices are:

DES - a 56-bit key with the DES encryption algorithm

3DES - a 168-bit key with the DES encryption algorithm

The NBG5715 and the remote IPSec router must use the same algorithms and

key , which can be used to encrypt and decrypt the message or to generate and

verify a message authentication code. Longer keys require more processing

power, resulting in increased latency and decreased throughput.

Authentication

Algorithm

Select which hash algorithm to use to authenticate packet data. Choices are

SHA1 and MD5. SHA1 is generally considered stronger than MD5, but it is also

slower.

SA Life Time Define the length of time before an IKE or IPSec SA automatically renegotiates

in this field. It may range from 1 to 2,000,000,000 seconds.

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.

Table 54 Security > IPSec VPN > General > Edit: IKE (continued)

LABEL DESCRIPTION

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 291 292

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