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Prestige 2602H/HW Series User’s Guide
Chapter 17 VPN Screens 219
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 94 on page 218) 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 228), 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 237 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 228), 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 228). 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.