Acl Application For Packet Filtering; Filtering Ipv4 Packets - 3Com 4500G Family Configuration Manual

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ACL Application for Packet Filtering

When applying an ACL for packet filtering, go to these sections for information you are interested in:

Filtering IPv4 Packets

Filtering IPv6 Packets
ACL Application Example
You can apply an ACL to the inbound or direction of an Ethernet interface or VLAN interface to filter
packets:
Applied to an Ethernet interface, an ACL can filter all IPv4 packets and IPv6 packets that are
received on the interface.
Applied to a VLAN interface, an ACL filters only Layer 3 packets that are needed to be forwarded
through the VLAN interface.
You can edit the rules in an applied ACL, such as add, remove, and modify rules, and the edited rules
take effect immediately.
You can configure an interval for collecting and outputting packet filtering logs. The log information
includes the number of matching packets and the ACL rules used.
The system only logs traffic filtered by basic and advanced ACL rules with the logging keyword
configured.
Filtering IPv4 Packets
Follow these steps to apply an IPv4 ACL to an interface to filter IPv4 packets:
To do...
Enter system view
Enter
interface
view
Apply a basic or advanced IPv4
ACL to the interface to filter
IPv4 packets
system-view
Enter Ethernet interface interface-type
interface view interface-number
Enter VLAN interface vlan-interface
interface view vlan-id
packet-filter { acl-number |
name acl-name } inbound
Use the command...
4-1
Remarks
—
Use either command
Required
By default, an interface does
not filter IPv4 packets.