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ZyWALL 10/50 Internet Security Gateway
VPN/IPSec Setup 26-7
Table 26-3 Menu 27.1 — IPSec Summary
FIELD DESCRIPTION EXAMPLE
Local Addr
End
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
Single, this is the same (static) IP address as in the Local Addr Start
field.
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
Range, this is the end (static) IP address, in a range of computers on the
LAN behind your ZyWALL.
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
SUBNET, this is a subnet mask on the LAN behind your ZyWALL.
192.168.1.38
Encap
This field displays Tunnel mode or Transport mode. See earlier for a
discussion of these. You need to finish configuring the VPN policy in menu
27.1.1.1 or 27.1.1.2 if ??? is displayed.
Tunnel
IPSec
ALgorithm
This field displays the security protocols used for an SA. ESP provides
confidentiality and integrity of data by encrypting the data and
encapsulating it into IP packets. Encryption methods include 56-bit DES
and 168-bit 3DES. NULL denotes a tunnel without encryption.
AH (Authentication Header) provides strong integrity and authentication
by adding authentication information to IP packets. This authentication
information is calculated using header and payload data in the IP packet.
This provides an additional level of security. AH choices are MD5 (default
- 128 bits) and SHA -1(160 bits).
Both AH and ESP increase the ZyWALL’s processing requirements and
communications latency (delay).
You need to finish configuring the VPN policy in menu 27.1.1.1 or 27.1.1.2
if ??? is displayed.
ESP DES MD5
Key Mgt
This field displays the SA’s type of key management, (IKE or Manual). IKE
Remote
Addr Start
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
Single, this is a (static) IP address on the network behind the remote
IPSec router.
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
Range, this is the beginning (static) IP address, in a range of computers
on the network behind the remote IPSec router.
When the Addr Type field in Menu 27.1.1 IPSec Setup is configured to
SUBNET, this is a (static) IP address on the network behind the remote
IPSec router.
This field dis
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la
y
s N/
A
when
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ou confi
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ure the Secure Gatewa
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Add
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172.16.2.40