Configuring An Ipsec Transform Set - HP VSR1000 Security Configuration Manual

Figure 53 Mirror image ACLs
If the ACL rules on IPsec peers do not form mirror images of each other, SAs can be set up only when both
of the following requirements are met:
The range specified by an ACL rule on one peer is covered by its counterpart ACL rule on the other
•
peer. As shown in
by its counterpart on Router B.
The peer with the narrower rule initiates SA negotiation. If a wider ACL rule is used by the SA
•
initiator, the negotiation request might be rejected because the matching traffic is beyond the scope
of the responder. As shown in
accepted but the SA negotiations from Host C to Host A, from Host C to Host B, and from Host D to
Host A are rejected.
Figure 54 Non-mirror image ACLs

Configuring an IPsec transform set

An IPsec transform set, part of an IPsec policy, defines the security parameters for IPsec SA negotiation,
including the security protocol, encryption algorithms, and authentication algorithms.
Changes to an IPsec transform set affect only SAs negotiated after the changes. To apply the changes to
existing SAs, execute the reset ipsec sa command to clear the SAs so that they can be set up by using the
updated parameters.
To configure an IPsec transform set:
Figure 54, the range specified by the ACL rule configured on Router A is covered
Figure 54, the SA negotiation initiated by Host A to Host C is
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