ZyXEL Communications USG-300 - V2.20 ED 2, Manual

Page: 485 / 1149

Chapter 25 IPSec VPN
ZyWALL USG 300 User’s Guide
485
Check Method Select how the ZyWALL checks the connection. The peer must be
configured to respond to the method you select.
Select icmp to have the ZyWALL regularly ping the address you
specify to make sure traffic can still go through the connection. You
may need to configure the peer to respond to pings.
Select tcp to have the ZyWALL regularly perform a TCP handshake
with the address you specify to make sure traffic can still go through
the connection. You may need to configure the peer to accept the TCP
connection.
Check Port This field displays when you set the Check Method to tcp . Specify
the port number to use for a TCP connectivity check.
Check Period Enter the number of seconds between connection check attempts.
Check Timeout Enter the number of seconds to wait for a response before the
attempt is a failure.
Check Fail
Tolerance
Enter the number of consecutive failures allowed before the ZyWALL
disconnects the VPN tunnel. The ZyWALL resumes using the first peer
gateway address when the VPN connection passes the connectivity
check.
Check this
Address
Select this to specify a domain name or IP address for the
connectivity check. Enter that domain name or IP address in the field
next to it.
Check the First
and Last IP
Address in the
Remote Policy
Select this to have the ZyWALL check the connection to the first and
last IP addresses in the connection’s remote policy. Make sure one of
these is the peer gateway’s LAN IP address.
Log Select this to have the ZyWALL generate a log every time it checks
this VPN connection.
Inbound/
Outbound traffic
NAT
Outbound Traffic
Source NAT This translation hides the source address of computers in the local
network. It may also be necessary if you want the ZyWALL to route
packets from computers outside the local network through the IPSec
SA.
Source Select the address object that represents the original source address
(or select
Create Object to configure a new one). This is the address
object for the computer or network outside the local network. The
size of the original source address range (
Source ) must be equal to
the size of the translated source address range ( SNAT ).
Destination Select the address object that represents the original destination
address (or select
Create Object to configure a new one). This is the
address object for the remote network.
SNAT Select the address object that represents the translated source
address (or select
Create Object to configure a new one). This is the
address object for the local network. The size of the original source
address range (
Source ) must be equal to the size of the translated
source address range ( SNAT ).
Table 128 Configuration > VPN > IPSec VPN > VPN Connection > Edit (continued)
LABEL DESCRIPTION