273
13. Return to system view.
quit
N/A
14.
lifetime.
ipsec
sa
global-duration
{
time-based
seconds |
traffic-based
kilobytes }
By default, time-based SA lifetime
is 3600 seconds, and
traffic-
1843200 kilobytes.
15. (Optional.) Enable the global
IPsec SA idle timeout
feature, and set the global
SA idle timeout.
ipsec sa idle-time
seconds
By default, the global IPsec SA
idle timeout feature is disabled.
16.
Create an IPsec policy by
using the
template.
ipsec
{
ipv6-policy
|
policy
}
policy-name seq-number
isakmp
template-name
By default, no IPsec policy exists.
Applying an IPsec policy to an interface
You can apply an IPsec policy to an interface to protect certain data flows. To cancel the IPsec
protection, remove the application of the IPsec policy. In addition to VLAN interfaces, you can apply
an IPsec policy to tunnel interfaces to protect applications such as GRE.
For each packet to be sent out of an interface applied with an IPsec policy, the interface looks
through the IPsec policy entries in the IPsec policy in ascending order of sequence numbers. If the
packet matches the ACL of an IPsec policy entry, the interface uses the IPsec policy entry to protect
the packet. If no match is found, the interface sends the packet out without IPsec protection.
When the interface receives an IPsec packet whose destination address is the IP address of the
local device, it searches for the inbound IPsec SA according to the SPI carried in the IPsec packet
header for de-encapsulation. If the de-encapsulated packet matches the permit rule of the ACL, the
device processes the packet. Otherwise, it drops the packet.
An interface can have only one IPsec policy applied. An IKE-based IPsec policy can be applied to
more than one interface, but a manual IPsec policy can be applied to only one interface.
To apply an IPsec policy to an interface:
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Apply an IPsec policy to the
interface.
ipsec apply
{
policy
|
ipv6-policy
} policy-name
By default, no IPsec policy is
applied to the interface.
An interface can have
IPsec policy applied.
An IKE-mode IPsec policy can be
applied to multiple interfaces, and
a manual IPsec policy can be
applied to only one interface.
Enabling ACL checking for de-encapsulated packets
This feature uses the ACL in the IPsec policy to match the IP packets that are de-encapsulated from
incoming IPsec packets in tunnel mode, and it discards the IP packets that fail to match the ACL to
avoid attacks using forged packets.
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