ZyXEL Communications VSG1432-B101 Series User Manual

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 Chapter 21 IPSec
VSG1432-B101 Series User’s Guide
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Tunnel access 
from local IP 
addresses 
Specify the IP addresses of the devices behind the ZyXEL Device that 
can use the VPN tunnel. The local IP addresses must correspond to the 
remote IPSec router's configured remote IP addresses. 
Two active SAs cannot have the local and remote IP address(es) both 
the same. Two active SAs can have the same local or remote IP 
address, but not both. You can configure multiple SAs between the 
same local and remote IP addresses, as long as only one is active at 
any time.
Use the drop-down list box to choose Single Address or Subnet
Select Single Address for a single IP address. Select Subnet to 
specify IP addresses on a network by their subnet mask.
IP Address 
for VPN 
When the local IP address type is configured to Single Address, enter 
a (static) IP address on the LAN behind your ZyXEL Device. 
When the local IP address type is configured to Subnet, enter a 
(static) IP address on the LAN behind your ZyXEL Device. 
IP 
Subnetmask
When the local IP address type is configured to Single Address, this 
field is not available. 
When the local IP address type is configured to Subnet, enter a subnet 
mask on the LAN behind your ZyXEL Device.
Tunnel access 
from remote IP 
addresses  
Specify the IP addresses of the devices behind the remote IPSec router 
that can use the VPN tunnel. The remote IP addresses must correspond 
to the remote IPSec router's configured local IP addresses. 
Two active SAs cannot have the local and remote IP address(es) both 
the same. Two active SAs can have the same local or remote IP 
address, but not both. You can configure multiple SAs between the 
same local and remote IP addresses, as long as only one is active at 
any time.
Use the drop-down list box to choose Single Address or Subnet
Select Single Address with a single IP address. Select Subnet to 
specify IP addresses on a network by their subnet mask.
IP Address 
for VPN 
When the remote IP address type is configured to Single Address
enter a (static) IP address on the network behind the remote IPSec 
router. 
When the remote IP address type is configured to Subnet, enter a 
(static) IP address on the network behind the remote IPSec router. 
IP 
Subnetmask
When the remote IP address type is configured to Single Address
this field is not available. 
When the remote IP address type is configured to Subnet, enter a 
subnet mask on the network behind the remote IPSec router.
Protocol 
This field displays ESP and the ZyXEL Device uses ESP (Encapsulation 
Security Payload) for VPN. The ESP protocol (RFC 2406) provides 
encryption as well as some of the services offered by AH
Key Exchange 
Method 
Select Auto(IKE) or Manual from the drop-down list box. Auto(IKE) 
provides more protection so it is generally recommended. Manual is a 
useful option for troubleshooting if you have problems using 
Auto(IKE) key management. 
Table 88   IPSec Settings > Add/Edit: Manual
LABEL
DESCRIPTION