272
Step Command
Remarks
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 reference only
one IPsec policy.
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.
To enable ACL checking for de-encapsulated packets:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable ACL checking for
de-encapsulated packets.
ipsec decrypt-check enable
By default, this feature is enabled.
Configuring IPsec anti-replay
The IPsec anti-replay feature protects networks against anti-replay attacks by using a sliding window
mechanism called anti-replay window. This feature checks the sequence number of each received
IPsec packet against the current IPsec packet sequence number range of the sliding window. If the
sequence number is not in the current sequence number range, the packet is considered a replayed
packet and is discarded.
IPsec packet de-encapsulation involves complicated calculation. De-encapsulation of replayed
packets is not required, and the de-encapsulation process consumes large amounts of resources
and degrades performance, resulting in DoS. IPsec anti-replay can check and discard replayed
packets before de-encapsulation.
In some situations, service data packets are received in a different order than their original order. The
IPsec anti-replay feature drops them as replayed packets, which impacts communications. If this
happens, disable IPsec anti-replay checking or adjust the size of the anti-replay window as required.
IPsec anti-replay does not affect manually created IPsec SAs. According to the IPsec protocol, only
IKE-based IPsec SAs support anti-replay checking.
