Anyconnect client firewall or group policy VPN filter?
I have seen that if I want to place an ACL for a VPN group I can either do it via a VPN filter within the group policy settings or by applyinh a private ACL under anyconnect > client firewall settings.
Which method is the preffered method and what are the differences?
VPN filter is global method that provides granular restriction (port based filtering) which can be used to restrict the traffic originating from the client. The VPN filter checks the incoming connections over the VPN tunnel.
Client firewall option is mostly used when you have Local Lan Access applied , so that with Lan access enabled , you can filter the traffic (e.g allowing access to only printers in local lan). Hope this helps.
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.
a VPN filter the ACL (which is stateful) is applied to traffic both bi-directionally and to all interfaces. 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.
If you use client firewall settings you can have rules configured and that will be pushed to the VPN client table during the IKE negotiation itself. In Client firewall you have multiple options. Here you have to define inbound and outbound ACL's seperately. In client-firewall options you can define policies for zone alarm, IPS, customized servers. etc.
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[toc:faq]Introduction:This document describes details on how NAT-T
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