ZyXEL VSG1432-B101 User Guide - Page 262

ID Type and Content

Page 262 highlights

Chapter 21 IPSec Finally, NAT is compatible with ESP in tunnel mode because integrity checks are performed over the combination of the "original header plus original payload," which is unchanged by a NAT device. The compatibility of AH and ESP with NAT in tunnel and transport modes is summarized in the following table. Table 90 VPN and NAT SECURITY PROTOCOL MODE AH Transport AH Tunnel ESP Transport ESP Tunnel NAT N N Y* Y Y* - This is supported in the ZyXEL Device if you enable NAT traversal. 21.4.7 ID Type and Content With aggressive negotiation mode (see Section 21.4.4 on page 260), the ZyXEL Device identifies incoming SAs by ID type and content since this identifying information is not encrypted. This enables the ZyXEL Device to distinguish between multiple rules for SAs that connect from remote IPSec routers that have dynamic WAN IP addresses. Regardless of the ID type and content configuration, the ZyXEL Device does not allow you to save multiple active rules with overlapping local and remote IP addresses. With main mode (see Section 21.4.4 on page 260), the ID type and content are encrypted to provide identity protection. In this case the ZyXEL Device can only distinguish between up to 12 different incoming SAs that connect from remote IPSec routers that have dynamic WAN IP addresses. The ZyXEL Device can distinguish up to 48 incoming SAs because you can select between three encryption algorithms (DES, 3DES and AES), two authentication algorithms (MD5 and SHA1) and eight key groups when you configure a VPN rule (see Section 21.3 on page 248). 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. Table 91 Local ID Type and Content Fields LOCAL ID TYPE= CONTENT= IP Type the IP address of your computer. DNS Type a domain name (up to 31 characters) by which to identify this ZyXEL Device. 262 VSG1432-B101 Series User's Guide

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Chapter 21 IPSec
VSG1432-B101 Series User’s Guide
262
Finally, NAT is compatible with ESP in tunnel mode because integrity checks are
performed over the combination of the "original header plus original payload,"
which is unchanged by a NAT device. The compatibility of AH and ESP with NAT in
tunnel and transport modes is summarized in the following table.
Y* - This is supported in the ZyXEL Device if you enable NAT traversal.
21.4.7
ID Type and Content
With aggressive negotiation mode (see
Section 21.4.4 on page 260
), the ZyXEL
Device identifies incoming SAs by ID type and content since this identifying
information is not encrypted. This enables the ZyXEL Device to distinguish
between multiple rules for SAs that connect from remote IPSec routers that have
dynamic WAN IP addresses.
Regardless of the ID type and content configuration, the ZyXEL Device does not
allow you to save multiple active rules with overlapping local and remote IP
addresses.
With main mode (see
Section 21.4.4 on page 260
), the ID type and content are
encrypted to provide identity protection. In this case the ZyXEL Device can only
distinguish between up to 12 different incoming SAs that connect from remote
IPSec routers that have dynamic WAN IP addresses. The ZyXEL Device can
distinguish up to 48 incoming SAs because you can select between three
encryption algorithms (DES, 3DES and AES), two authentication algorithms (MD5
and SHA1) and eight key groups when you configure a VPN rule (see
Section 21.3
on page 248
). 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.
Table 90
VPN and NAT
SECURITY
PROTOCOL
MODE
NAT
AH
Transport
N
AH
Tunnel
N
ESP
Transport
Y*
ESP
Tunnel
Y
Table 91
Local ID Type and Content Fields
LOCAL ID
TYPE=
CONTENT=
IP
Type the IP address of your computer.
DNS
Type a domain name (up to 31 characters) by which to identify this
ZyXEL Device.