Peer A has a local endpoint of 172.16.10.0/24 and Peer B has a local endpoint of 172.16.20.0/24. Exampleīased on 2 VPN peers, Peer A and Peer B. It is also worth mentioning like most ACLs there is an implicit deny rule is applied by default. ![]() Because of this the definition of the source and destination fields within the ACL do not apply instead the ACL fields relate to what IP/Port should be permitted or denied for the Local and Remote subnets. However with a VPN filter the ACL,(which is stateful) it is applied to traffic, both bi-bidirectionally and to all interfaces. When an ACL is applied to an interface, we define when it should permit (or deny) traffic that is either going in or out of the interface. The interesting part (and typically the most confusing) is how the ACL is defined. VPN filters are configured by defining an ACL, assigning the ACL to a group-policy and then assigning the group-policy to your tunnel-group. Note : When the command ‘sysopt connection permit-ipsec’ is applied, all traffic that transverses the ASA via a VPN bypasses any interface access-lists (versions lower 7.1 use ‘sysopt connection permit-ipsec’). Within this article we will look into how VPN filters work and also how to configure them on a Cisco ASA firewall.Īs the name suggests VPN filters provide the ability to permit or deny post-decrypted traffic after it exits a tunnel and pre-encrypted traffic before it enters a tunnel.
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