HP 6120G/XG HP ProCurve Series 6120 Blade Switches Access Security Guide - Page 396
General ACL Operating Notes, ACLs Do Not Filter Traffic Generated by the Switch.
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IPv4 Access Control Lists (ACLs) General ACL Operating Notes Note General ACL Operating Notes ACLs do not provide DNS hostname support. Protocol Support: ACL criteria includes IP, TCP, and UDP. ACLs do not use these protocols: ■ TOS (Type-of-Service) ■ Precedence ■ MAC information ■ QoS ACLs do not affect switch serial port access. ACLs filter both Layer 2 and Layer 3 on a port. There is no performance degradation with ACLs enabled; traffic is at line rate. When the ACL configuration includes TCP or UDP options, the switch operates in "strict" TCP and UDP mode for increased control. The switch compares all TCP and UDP packets against the ACLs. Replacing or Adding To an Active ACL Policy. If you assign an ACL to an interface and subsequently want to add or replace ACEs in that ACL, you must first remove the ACL from all assigned interfaces. When an ACE becomes active, it screens the packets resulting from new traffic connections. It does not screen packets resulting from currently open traffic connections. If you invoke a new ACE to screen packets in a currently open traffic connection, you must force the connection to close before the ACE can begin screening packets from that source. ACLs Do Not Filter Traffic Generated by the Switch. Because ACLs filter only inbound traffic at the inbound physical port, outbound traffic from any source is not filtered by any ACL(s) configured on the switch. Filtering of such traffic must be done at a downstream device. 9-72
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