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6-4
VPN 3002 Hardware Client Reference, Release 4.0
OL-3813-01
Chapter 6 Tunneling
Configuration | System | Tunneling Protocols | IPSec
Backup Easy VPN Servers
To configure IPSec backup servers on the VPN 3002, enter up to 10 backup servers, using either IP
address or hostname. Enter each backup server on a separate line. To enter a hostname, a DNS server
must be configured. Further, if you use hostnames and the DNS server is unavailable, significant delays
can occur.
Note If you are using hostnames, it is wise to have backup DNS and WINS servers on a separate network
from that of the primary DNS and WINS servers. Otherwise, if clients behind the VPN 3002 obtain
DNS and WINS information from the VPN 3002 through DHCP, and the connection to the primary
server is lost, and the backup servers have different DNS and WINS information, clients cannot be
updated until the DHCP lease expires.
About Backup Servers
IPSec backup servers let a VPN 3002 connect to the central site when its primary central-site VPN
Concentrator is unavailable. You configure backup servers for a VPN 3002 either on the VPN 3002, or
on a group basis at the central-site VPN Concentrator. If you configure backup servers on the primary
central-site VPN Concentrator, that VPN Concentrator pushes the backup server policy to the VPN 3002
hardware clients in the group. By default, the policy is to use the backup server list configured on the
VPN 3002. Alternatively, the VPN Concentrator can push a policy that supplies a list of backup servers
in order of priority, replacing the backup server list on the VPN 3002 if one is configured. It can also
disable the feature and clear the backup server list on the VPN 3002 if one is configured.
Figure 6-3 illustrates how the backup server feature works.
Figure 6-3 Backup Server Implementation
San Jose
VPN 3080
Concentrator
Austin
VPN 3000
Concentrator
Fargo
VPN 3002
Hardware Client
Boston
VPN 3000
Concentrator
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