HP VPN Firewall Appliances VPN Configuration Guide

172
Ste
p
Command Remar
k
8. Set the anti-replay
information synchronization
intervals in IPsec stateful
failover mode.
synchronization
anti-replay-interval inbound
inbound-number outbound
outbound-number
Optional.
By default, the inbound
anti-replay window information
is synchronized whenever 1000
packets are received, and the
outbound anti-replay sequence
number is synchronized
whenever 100000 packets are
sent.
Support for this feature depends
on the device model. For more
information, see the following
matrix table.
9. Enable the IPsec policy.
policy enable
Optional.
Enabled by default.
10. Return to system view.
quit N/A
11. Configure the global SA
lifetime.
ipsec sa global-duration
{ time-based seconds |
traffic-based kilobytes }
Optional.
By default, time-based SA
lifetime is 3600 seconds and
traffic-based SA lifetime is
1843200 kilobytes.
12. Create an IPsec policy by
referencing an IPsec policy
template.
ipsec policy policy-name
seq-number isakmp template
template-name
By default, no IPsec policy exists.
With SAs to be established through IKE negotiation, an IPsec policy can reference up to six IPsec
transform sets. During negotiation, IKE searches for a fully matched IPsec transform set at the two ends of
the expected IPsec tunnel. If no match is found, no SA can be set up and the packets expecting to be
protected will be dropped.
During IKE negotiation for an IPsec policy with PFS enabled, an additional key exchange is performed.
If the local end uses PFS, the remote end must also use PFS for negotiation and both ends must use the
same DH group. Otherwise, the negotiation will fail.
An SA uses the global lifetime settings when it is not configured with lifetime settings in IPsec policy view.
When negotiating to set up SAs, IKE uses the local lifetime settings or those proposed by the peer,
whichever are smaller.
Applying an IPsec policy group to an interface
An IPsec policy group is a collection of IPsec policies with the same name but different sequence numbers.
In an IPsec policy group, an IPsec policy with a smaller sequence number has a higher priority.
You can apply an IPsec policy group to a logical or physical interface to protect certain data flows. To
cancel the IPsec protection, remove the application of the IPsec policy group.
For each packet to be sent out an IPsec protected interface, the system looks through the IPsec policies in
the IPsec policy group in ascending order of sequence numbers. If an IPsec policy matches the packet,
the system uses the IPsec policy to protect the packet. If no match is found, the system sends the packet out
without IPsec protection.