AR8327-AL1A-R datasheet(51/394 Pages) ETC2

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Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

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The lookup field will depend on the direction of the frame. For the SNAT, the SP, SIP, protocol in the

frame will be used to match the corresponding field in the table. While doing DNAT, the DP, DIP, and

protocol in the frame are used.

2.19.2

NAPT Entry

There are 1024 entries in the NAPT table. Each entry is 112 bits wide. The detail format is shown in

Table 2-35.

73:72

ACTION

2'b00:Mirror

2'b01:Redirect

2'b10:Copy

2'b11:forward

CNT EN

1'b1: counter should be add one, counter number selected by CNT

INDEX

70:68

CNT INDEX

Counter index to select entry match.

67:56

PRIVATE IP

12bits private IP.

The private IP is constructed under the control bit

PRIVATE_IP_BASE_SEL

1'b1: these 12 bits are the private IP bit [19:16] and [7:0].

1'b0: these 12 bits are the private IP bit [11:0].

When do SNAT, compare with frame SIP

When do DNAT, used to change frame DIP

55:48

RANGE

Port number range.

port number start<= port number < port number start+range

47:32

PORT NUM START

Port number start value

When do SNAT, compare to frame SP.

When do DNAT, compare to frame DP.

31:0

SIP

Router SIP.

When do SNAT, used to change frame SIP.

When do DNAT, compare with frame DIP

Table 2-35.

NAPT Entry Table

Bit

Name

Description

111:108

AGING FLAG

15: static

14~1: dynamic

0:entry invalid

107:104

RESERVED

103

CNT EN

1'b1: the frame matched to this entry should be added to counter selected

by CNT INDEX.

102:100

CNT INDEX

Counter index to select counter

99:98

PROTOCOL

2'b00: TCP

2'b01: UDP

2'b10: Reserved

2'b11: GRE

Table 2-34.

Basic NAT Table

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