Chapter 17: IP Packet Filters, Subscriber Management
STANDARD Revision 1.0
C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved.
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IP Packet Filter
An IP packet filter is a provisionable mechanism that examines the header of each IP packet and looks to match the
contents of any or all of the following data fields:
Source IPv4 address
Source IPv4 mask
Destination IPv4 address
Destination IPv4 mask
Source IPv6 address
Source IPv6 prefix
Destination IPv6 address
Destination IPv6 prefix
Type of service
IP Version
IPv6 Flow Label
Source port
Destination port
IP Protocol
When a match condition occurs, one of the following filter actions can be taken:
Drop
Accept
Note: Optional IP packet filters can be provisioned to match these fields.
IP Filter Groups
IP filters are configured in groups. The filters in each group are kept in an ordered list and applied in sequence.
The first IP filter in the sequence to satisfy the matching requirements is used as the one and only match. When an IP filter
encounters a packet that matches, the match count for this IP filter is incremented and the packet is accepted or dropped
depending on the action programmed for this IP filter. If no rules match then the packet is accepted.
A packet matches a filter if all of the values of the filter fields match the values in the corresponding packet fields.
