Zyxel-communications ADSL VoIP IAD with 802.11g Wireless 2602HW Series Bedienungsanleitung PDF herunterladen (Seite 207)

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Prestige 2602HW Series User’s Guide

Chapter 17 VPN Screens 207

17.8.1 NAT Traversal Configuration

For NAT traversal to work you must:

• Use ESP security protocol (in either transport or tunnel mode).

• Use IKE keying mode.

• Enable NAT traversal on both IPSec endpoints.

In order for IPSec router A (see Figure 88 on page 206) to receive an initiating IPSec packet

from IPSec router B, set the NAT router to forward UDP port 500 to IPSec router A.

17.9 ID Type and Content

With aggressive negotiation mode (see Section 17.12.1 on page 216), the Prestige identifies

incoming SAs by ID type and content since this identifying information is not encrypted. This

enables the Prestige to distinguish between multiple rules for SAs that connect from remote

IPSec routers that have dynamic WAN IP addresses. Telecommuters can use separate

passwords to simultaneously connect to the Prestige from IPSec routers with dynamic IP

addresses (see Section 17.18 on page 225 for a telecommuter configuration example).

Regardless of the ID type and content configuration, the Prestige does not allow you to save

multiple active rules with overlapping local and remote IP addresses.

With main mode (see Section 17.12.1 on page 216), the ID type and content are encrypted to

provide identity protection. In this case the Prestige can only distinguish between up to 12

different incoming SAs that connect from remote IPSec routers that have dynamic WAN IP

addresses. The Prestige can distinguish up to 12 incoming SAs because you can select between

three encryption algorithms (DES, 3DES and AES), two authentication algorithms (MD5 and

SHA1) and two key groups (DH1 and DH2) when you configure a VPN rule (see Section

17.13 on page 216). The ID type and content act as an extra level of identification for

incoming SAs.

The type of ID can be a domain name, an IP address or an e-mail address. The content is the IP

address, domain name, or e-mail address.

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